I once owned a Higgins-built 1944 LCP-L that served in WW2. Original 6-71. Ran it in SF Bay for years. Great boat, great engine! Boat is now owned by the National WW2 Museum in NOLA. Its all restored now... like new!
I worked on Detroits for 30+ years , of all different series and arrangements . These old 671Ns were basically bulletproof and would take all sorts of abuse and still run . I've even seen them run backwards for a short time . They were constant leakers of oil . If it didn't leak oil you had better make sure it had some in it , and at idle they'd be fine on 5 psi (which is why this engine showed very little at a very slow rpm) . Toward the end of their manufacturing run , some of the high output 671TAB engines were producing 485 HP , but were really pushing the reliability envelope . The strangest set of Detroits I ever dealt with were "Lay down" Aluminum blocked 671 minesweeper engines which were WWII surplus in a 1952 Wheeler sportfishiing boat . They had brass end plates , and other non magnetic components but were a mofo to overhaul .
once you achieved your go no go settings on the rail, idle, high end is done through shimming the buffer pin,, ad shims ought to raise it to specks, generally all GM high end ideal are the same them, I haven't worked on GM's in 30 odd years, maybe a couple here & there. they are pretty easy to work on. They make power under load, self aspirating aren't real power makers. but through the blower. I just remembered, on the back end of the block or head is a fuel return, The fitting that goes in there is special orifice fitting, on the out side they look to be the same as any typical brace elbow, The engine can't make power with out having right fitting, back loads the fuelsystem which is required for those 2 cycle's.Leak off is an other thing when it comes to any injection system, bleed down is like short stroking,, game ending for power. make sure the air damper plate is set up with a easy to get a hold of pull tab just incase you get a runway suck fuel injector. good luck
Sorry took so long , but boatdesignDOTnet forums> design> propulsion> props> Range its all about efficiency has a chart posted is about all I've found . I got rid of all my manuals years ago .
I think you're talking about the limiting speed governor . I had a pair of 6-71TIs that someone thought they'd get more full load RPM by sticking nickels in the variable spring speed housing . LOL I checked no load and it started floating valves at 3100 rpm . XD
I was First Lieutenant on USS Polk County (LST 1084), 1959-61. We had two of these in davits. Engines were responsibility of the Engineering Dept, and all other PM's were my Deck Force. I remember one particular attempted launch when that relationship taught me a very valuable leadership lesson. We were ready to launch the boats and, of course, one of them didn't fire up. My reaction (I was 23 years old) was not professional. And the Captain let me know it. (privately) Praise in public, criticize in private--words to live by. Here I am 60 years later still remembering that concept. B Newman Tarzana, CA
I worked for a man that set up just about every one of them prior to D-day... he was the only one that knew how to run the injector testing machine , put them in matched sets, then set the racks and governors....had a deadline of memorial day to get all of them done...
I owned a 1944 Higgins LCP-L back in the '70s. Fished it all over SF Bay. Same engine. All original. Donated it to the National WW2 Museum in New Orleans where it is now on display.
i just got the chrysler straight 8 to turn over in my higgins.so spark is next.it hadnt ran in 10+ years and i just got it last month .your video is great and i wish you luck on it.nice job!
The sound of this engine is one that's very familiar to me. From c. 1964 to the late 1980s my father (USN fireman, POT 1944) skippered the _Sea Wind_ (W04284; Santa Cruz, CA), a Higgins LCVP converted for sport fishing with a covered bridge forward of the engine, a galley and two cabins further forward, and a new shallow-pointed prow (he'd previously owned a Monterey Double-Ender berthed at Moss Landing). The 6-71 was original equipment. I was too young to appreciate the engine and spent most of my time sleeping, rigging salmon lines or cleaning the head in the forward cabin. I do remember that my dad had an aerosol can of ether that he sprayed into the intake manifold before starting the engine.
A mating of one of the best work boats ( Higgins landing craft) with one of the great industrial diesels, the 6-71.\ thanks for sharing. I remember spending time on a "houseboat" lcvp with the pram bow ( per original) when I was in my teens. Sure wish I could find one now !
One of the coolest designs about the 6-71's was, if you lost an injector tip, instead of pumping fuel into the cylinder you could remove the fuel supply line to that injector and re-install it in the fuel log to totally bypass that injector. Sounded awful, but it would get you home!
Very nice indeed. I was not the Engineman on board, but I do remember we had two of these 6-71's on the converted LCM-6s that they made into Armored Troop Carriers (ATCs - "Tango Boats") in the Navy Mobile Riverine Force where I served in Vietnam. They were so weighed down with extra armor and weapons you were lucky to make 5 knots top speed on the water. They were good, reliable engines, but we ran the piss out of them. They'd do what maintenance they could on board, but with the muddy water and heavy loads, they had to be changed out for rebuilt engines when we put in for boatyard repairs at Dong Tam in the Mekong Delta. The coxswain's flat on the Tango Boats had the same throttle controls, the stirrup handles, one on either side of the wheel. You twist them to accelerate the engines, and pulled the back and down to reverse the engine. I learned how to pilot the boat using the rudders and the engines for steering (forward on one, back on the other) and became proficient at berthing the boat alongside the dock or another boat without crashing into them.
I was there too. The control handles brought back memories. Also memories of sleeping next to two 6-71's as they idled along all night. Can still smell them.
Last time I had seen one of these was in a Mike 8 in Vietnam we had 4 of them 2 on each bank both bank of 671's were mated to a auto transmission,ran my first rack on the port inboard engine......long time ago baby.
Thanks for the video, some things never die. This is Gray Marine with the original Figure 8 low compression cylinder kits I assume. 18.7 to 1 if memory serves, the later N cylinder kits were 21 to 1. I use to rebuild these engines and the Twin Disc transmissions seen in the 70's and 80's. This air cooled transmission had 2 discs in it with mechanical toggle lever function. No oil pumps, no oil coolers, very simple. Have you ever wondered where "Twin Disc Transmissions" got their name? You're looking at it. Boats stranded in the gulf with low batteries would put pennies under the Rocker Arms as a compression relief. Start spinning the engine over and pull the pennies out one at a time until they'd have enough cylinders firing to keep it running. Many of the latest engines brag about their design advantages and this engine already had them built in. Oil cooled piston crown, flat cylinder head with piston combustion chamber, Full Floating wrist Pins, and on. There was only 4-5% higher VE between the 2 and 4 valve heads. The advantage was valve seat contact and the added cooling of the valves that came with it. 1-2 psi oil pressure for every hundred rpm. I would take 2-3 oil pressure gauges to install in a rebuilt package and swap for the highest reading gauge. It's a psychological thing for the customer. 8V-71 was my favorite but they were all good engines. My grandfather rebuilt the injectors on the side for 5-7 bucks a piece in the 50's well before I was born. Good times. If current injection technology was applied to this engine it could fix the few problems it had.
@@randymagnum143 Thanks Randy, I wasn't aware of that.. Newer designs are better and I thought there was a company in Germany that was working on applying this newer injector tech to these old 2 cycles to better throttle injection apply. Meaning slow down the process to get ride of some of the Diesel knock and burn cleaner. I never heard if they accomplished this, might've been MTU. I haven't been keeping up with it. The 4 cycles have the advantage of boosting at 3-4 power levels and the 2 cycle not so much but they were good at the time. I've retired and this is running 1000psi injection pressure, Yamaha 250HP HPDI. th-cam.com/video/MKpnwHyolwc/w-d-xo.html
@@randymagnum143 I've never seen this lake that flat so yea it was nice. This is a river boat not a lake boat. There are guys I read that run 300HP engines on this hull that've seen 100-104mph. I don't have the seat time to balance it on the pad and get there. Might be balance of the boat also. Still checking this out. This is a Air Trapping Mod-Vee like a Tri Hull with a 8 1/2 inch wide pad and they raised the sponsons on each side 3 inches above the pad. Around 60 it gets enough lift to break the sponsons loose and that's when it starts to Chine walk. We didn't have vests or any safety equipment and why I wasn't going faster, about 65-75 throttle position. If I see 75-80 with a full load I'd be fine with that. I think this GoPro 10 camera does a great job at IM Image Stabilization clamped to the ski pylon. Everything seems faster on the water. th-cam.com/video/VU-oMZjCHDw/w-d-xo.html When I retired my wife said finish the boat project that I'd been gathering pieces for a decade. If you're curious about these kind of boats the fastest boats in the world hang around here. My boat is the family sedan to some of these guys. www.screamandfly.com/content.php?s=6acf9bdaee670268af25db939a200d75
@@rudycarlson8245 Changed oil, oil filter and fuel filter. Turned the engine over with the starter to get oil pressure. Replaced and timed the fuel injectors. Fixed a push rod and rocker arm assembly that was damaged. The engine started as shown in the video.
Great video. I have had a lot of those engines in my charter boats and navy boats. They are good engines. People are still using them today. I didn't see any oil. Is there oil in that engine?
My first time to see a Detroit was a 16 cylinder EMD 16 feet long and 10 foot high ( offshore oil rig ) was I impressed? You bet ! There were 3 engines 1- on line generating , 1- idling , and 1- off line line .( wear the motors evenly )
Nice ole Higgins.... what year was this one built? Good video.... you might want to consider setting the idle speed up to 550/600 unless you're having an engagement issue with the drive at a higher rpm than its at now, also didn't see any trace of oil flow on the top end.... what was the oil pressure at idle?... IF any, at that low of an idle speed. I know that it can get pretty low... ie: around 5psi and they're ok with that when the oil is at operating temp.
Idle speed is now set at approximately 400 RPM. This was the first start up in 30 years. Took time for oil to start on the top end but it did get lubricated. It has been running good to date. Oil pressure at temperature is about 5-10 psi.
that's got the old solid rack. if one injector sticks in full fuel they all are. a broken back rack cuts out the danger of a runaway. good update to do.
The rocker arms were dry for the first 10 minutes of operation but lubrication finally arrived. See link at www.robertsarmory.com/higgins-boat-exhibit.html to view the lubrication.
why does it say "battle" on the governor ? I am about to rewire for a customer an early model 64-hn9 that has been fitted with an updated head. has a shut down delay, a blower flap solenoid, fuel pressure switch, water temp manifold sender and an over temp switch i am trying to figure out as its all been disconnected.
There are two settings for the governor spring, normal and battle. The battle spring hole allows about 200-300 rpm at the top end which results in more engine wear but also an increase in boat speed. I use the normal setting.
yes that ol girl has a 2 valve head,I've had a few dealings with them also,and agree they were tuff/tuff,and and the last one I drove over the road back in the1970's I called "Greasey " in a truck only about 5 miles per gallon
The later two stroke detroits went and put four exhaust valves in each cylinder. I had to rebuild a 3-71 in my boat. had never worked on a diesel. i'm a shade tree mechanic. after i was done, i decided that these engines are super easy to work on and it was most lkiely the best engine i ever worked on. the engineering on these beasts are second to none.
Two outside are exhaust, the center is fuel injector. Takes a special tool to set the fuel injector hight so it pumps the right amount. These are 2 cycle so the air comes in ports in the cylinder liner on the down stroke. each stroke is a compression stroke.
I believe that seawater pipe should be at least 2" wide if you're going to run it under load, but for exhibit at no more than idle I guess that small diameter intake is ok.
+tanker70th Ah ok cool. Yea I've had my hands on 2 open water systems. Generators cooled by city water, they were early 50s models , since you said it was from an earlier time , I was thinking it had an open systems too. Thanks for the info, sounds sweet :)
The rocker arms were dry for the first 10 minutes of operation but lubrication finally arrived. See link at www.robertsarmory.com/higgins-boat-exhibit.html to view the lubrication. After 30 years of sitting, it took time to get the oil throughout the system.
6-71 will run all day idle to full throttle on 3 pounds of oil pressure. That is the minimum for safely run. Drove an old gmc Twin screw tractor with a 6-71 Fully warmed up max oil pressure was 4 psi at idle and 17 psi at 2100 rpm
Maybe so but that's not in spec at all...you should have > 20psi at idle and upwards of 40psi loaded. Perhaps you were not running the correct weight oil.
I’ve got a couple of 6v53s installed new 1963 just the blower on top lots of noise and weight only delivering 195hp approx . Love them - I actually thought that 653 series was for the landing craft
@@SnowAndWaterSkiing the old diesels off the USS California 's 40" liberty boats all had gray marines in them when repurposed on the USS Valley Forge cvs -45 later LPH -8! in 1960's.
You will find the crank about on these boat motors is different to truck and stationary ones had to be careful getting exchange cranks in the day cos if you sent a boat crank back for your truck crank you got you lost your core deposit. Lot of guys never got to see year motors in multiple applications where you could have opposite direction rotation( mirror image layout) into drive gearbox or in some big pumping setups using four into drive using four mirror image layout none the same as these inline sixes could be built in four configurations, mirror image or diametrically mirror image, best to have a camera handy before disassembly rather than get part eat thru rebuild and realise you have orientation wrong lol
Daniel hoffman Top of head was cleaned prior to start. There is oil seeping through rocker bearings. Look closely. Oil pressure is about 30 psi. After about 5 minutes more oil accumulated at the top of the head.
Top of head was cleaned prior to start. There is oil seeping through rocker bearings. Look closely. Oil pressure is about 30 psi. After about 5 minutes more oil accumulated at the top of the head.
SnowAndWaterSkiing funny because he said "oil pressure 15 psi" and on a cold motor thats really low the oil pressure relif valve could not be set that low i can imagine as the motor warms the oil pressure dropping even lower i have seen the pushrods clog up on a lot of motors like that and not give much oil if any to the rocker bearings whithin that runn time those rockers and valve assemblys should have been covered imagine a hot motor under load trying to stay lubercated with just a few drops of oil every five minutes it wouldent last very long unless on purpose to demonstrate the motor to spectators they restricted or even blocked the oil completely and lubercated it manually that that would explain the short run times that this motor will have to endure for the rest of its life and never operate on the water again
Wasn’t that a Gray Marine 6-71 and not a Detroit? The head to expansion tank connection made it look like a Gray. Detroit’s were a bit more squarish...
This is a Gray Marine water craft propulsion system with a GM 6-71 engine. Later they were called Detroit 6-71. Gray Marine did not manufacture the engine.
Its heavy weight oil so yeah its slow .... best practice is to oil up the rockers before starting but he probably didn't know that or expect it to take so long for the oil to get there.
Want to see & hear...especially HEAR one of these apart from actually seeing one?...Watch the movie, "The thin red line"...there is an extended scene with several of these 6-71 powered boats, the 6-71s howling, turn up the volume!
This is a two-stroke diesel. There are 3 rocker arms per cylinder. Two are exhaust valves and the remaining one is the fuel injector. The blower provides air through the intake ports in the cylinder wall.
I beg to differ. We had 3 or 4 of them in trucks, they were the sorriest dogs ever to hit the highway, and their reliability was, well, somewhere between okay and disappointing. The one thing that did remain constant was their unfaltering ability to leak oil. They threw it while running, and kept the dust down by dribbling out in our back lot. Loud as all-get-out, they only impressed the young lads who thought that noise was equal to power. How quickly their minds were changed when they were sent out on a long trip with anything more than an empty trailer, hahaha....
Since the engine sat around for 30 years, it took some time for the oil to reach the rockers. It eventually did and the engine has been running for several sailing with no problems.
The rocker arms were dry for the first 10 miuutes of operation but lubrication finally arrived. See link at www.robertsarmory.com/higgins-boat-exhibit.html to view the lubrication.
I hate to be one of those people but, Don't you mean 6-53...DETROIT ? ( later gray marine because they ran backwards , and no need for a special prop ). The 6-71 series came much later, And having been in the " Brown water" navy, the P. B. R. HAD 6V-71 ENGINES. Plus the only way to keep leaking oil out of the air box was to never idle ! those N 50,60, or n-65 series injectors after a bunch of hours use, esp if you set the drag a little tight on the gauge would drip and the blower would blow the excess fuel thru the sleeve ports...............just saying........
No its a 71 series , they came out in 1936, detroit made them and gray marine marinized them. The only inline 53 series are 3 and 4 the six was a 6v53.
isn't it ironic- the company that built the.motors on the landing craft of the soldiers who TOTALLY mauled there asses is now.owned by those same asses...wtf is wrong with america people??
I once owned a Higgins-built 1944 LCP-L that served in WW2. Original 6-71. Ran it in SF Bay for years. Great boat, great engine!
Boat is now owned by the National WW2 Museum in NOLA. Its all restored now... like new!
I worked on Detroits for 30+ years , of all different series and arrangements . These old 671Ns were basically bulletproof and would take all sorts of abuse and still run . I've even seen them run backwards for a short time . They were constant leakers of oil . If it didn't leak oil you had better make sure it had some in it , and at idle they'd be fine on 5 psi (which is why this engine showed very little at a very slow rpm) . Toward the end of their manufacturing run , some of the high output 671TAB engines were producing 485 HP , but were really pushing the reliability envelope .
The strangest set of Detroits I ever dealt with were "Lay down" Aluminum blocked 671 minesweeper engines which were WWII surplus in a 1952 Wheeler sportfishiing boat . They had brass end plates , and other non magnetic components but were a mofo to overhaul .
+Ignignokt Mooninite
Do you know where I can get the HP versus RPM performace curves for this engine, 6-71 NH9?
Ignignokt Mooninite respect man
once you achieved your go no go settings on the rail, idle, high end is done through shimming the buffer pin,, ad shims ought to raise it to specks, generally all GM high end ideal are the same them, I haven't worked on GM's in 30 odd years, maybe a couple here & there. they are pretty easy to work on. They make power under load, self aspirating aren't real power makers. but through the blower. I just remembered, on the back end of the block or head is a fuel return, The fitting that goes in there is special orifice fitting, on the out side they look to be the same as any typical brace elbow, The engine can't make power with out having right fitting, back loads the fuelsystem which is required for those 2 cycle's.Leak off is an other thing when it comes to any injection system, bleed down is like short stroking,, game ending for power. make sure the air damper plate is set up with a easy to get a hold of pull tab just incase you get a runway suck fuel injector. good luck
Sorry took so long , but boatdesignDOTnet forums> design> propulsion> props> Range its all about efficiency has a chart posted is about all I've found .
I got rid of all my manuals years ago .
I think you're talking about the limiting speed governor . I had a pair of 6-71TIs that someone thought they'd get more full load RPM by sticking nickels in the variable spring speed housing . LOL
I checked no load and it started floating valves at 3100 rpm . XD
I was First Lieutenant on USS Polk County (LST 1084), 1959-61. We had two of these in davits. Engines were responsibility of the Engineering Dept, and all other PM's were my Deck Force. I remember one particular attempted launch when that relationship taught me a very valuable leadership lesson.
We were ready to launch the boats and, of course, one of them didn't fire up. My reaction (I was 23 years old) was not professional. And the Captain let me know it. (privately) Praise in public, criticize in private--words to live by. Here I am 60 years later still remembering that concept.
B Newman
Tarzana, CA
I worked for a man that set up just about every one of them prior to D-day... he was the only one that knew how to run the injector testing machine , put them in matched sets, then set the racks and governors....had a deadline of memorial day to get all of them done...
I owned a 1944 Higgins LCP-L back in the '70s. Fished it all over SF Bay. Same engine. All original. Donated it to the National WW2 Museum in New Orleans where it is now on display.
i just got the chrysler straight 8 to turn over in my higgins.so spark is next.it hadnt ran in 10+ years and i just got it last month .your video is great and i wish you luck on it.nice job!
The sound of this engine is one that's very familiar to me. From c. 1964 to the late 1980s my father (USN fireman, POT 1944) skippered the _Sea Wind_ (W04284; Santa Cruz, CA), a Higgins LCVP converted for sport fishing with a covered bridge forward of the engine, a galley and two cabins further forward, and a new shallow-pointed prow (he'd previously owned a Monterey Double-Ender berthed at Moss Landing). The 6-71 was original equipment. I was too young to appreciate the engine and spent most of my time sleeping, rigging salmon lines or cleaning the head in the forward cabin. I do remember that my dad had an aerosol can of ether that he sprayed into the intake manifold before starting the engine.
A mating of one of the best work boats ( Higgins landing craft) with one of the great industrial diesels, the 6-71.\
thanks for sharing. I remember spending time on a "houseboat" lcvp with the pram bow ( per original) when I was in my teens. Sure wish I could find one now !
One of the coolest designs about the 6-71's was, if you lost an injector tip, instead of pumping fuel into the cylinder you could remove the fuel supply line to that injector and re-install it in the fuel log to totally bypass that injector. Sounded awful, but it would get you home!
Very nice indeed. I was not the Engineman on board, but I do remember we had two of these 6-71's on the converted LCM-6s that they made into Armored Troop Carriers (ATCs - "Tango Boats") in the Navy Mobile Riverine Force where I served in Vietnam. They were so weighed down with extra armor and weapons you were lucky to make 5 knots top speed on the water. They were good, reliable engines, but we ran the piss out of them. They'd do what maintenance they could on board, but with the muddy water and heavy loads, they had to be changed out for rebuilt engines when we put in for boatyard repairs at Dong Tam in the Mekong Delta. The coxswain's flat on the Tango Boats had the same throttle controls, the stirrup handles, one on either side of the wheel. You twist them to accelerate the engines, and pulled the back and down to reverse the engine. I learned how to pilot the boat using the rudders and the engines for steering (forward on one, back on the other) and became proficient at berthing the boat alongside the dock or another boat without crashing into them.
+Michael Eggleston
Thanks for serving.
12-B
+Michael Eggleston Welcome Home Brother!
I was there too. The control handles brought back memories. Also memories of sleeping next to two 6-71's as they idled along all night. Can still smell them.
Last time I had seen one of these was in a Mike 8 in Vietnam we had 4 of them 2 on each bank both bank of 671's were mated to a auto transmission,ran my first rack on the port inboard engine......long time ago baby.
Heck yeah, that 6-71 sounds damn good!
Very nice thanks for sharing and taking care of that piece of history.
Sounds Great!
Looks like your almost ready to hit the beach!
sobering to realize this might have been the last thing so many people heard on D-Day
1961, My USS Maury AGS 16 had two LCVP,s on board @ this was the beginning of my career in the Diesel field .
screaming Jimmy to let Jerry know you were coming. I gotz a soft spot for Higgins boats
Thanks for the video, some things never die. This is Gray Marine with the original Figure 8 low compression cylinder kits I assume. 18.7 to 1 if memory serves, the later N cylinder kits were 21 to 1. I use to rebuild these engines and the Twin Disc transmissions seen in the 70's and 80's. This air cooled transmission had 2 discs in it with mechanical toggle lever function. No oil pumps, no oil coolers, very simple. Have you ever wondered where "Twin Disc Transmissions" got their name? You're looking at it.
Boats stranded in the gulf with low batteries would put pennies under the Rocker Arms as a compression relief. Start spinning the engine over and pull the pennies out one at a time until they'd have enough cylinders firing to keep it running. Many of the latest engines brag about their design advantages and this engine already had them built in. Oil cooled piston crown, flat cylinder head with piston combustion chamber, Full Floating wrist Pins, and on.
There was only 4-5% higher VE between the 2 and 4 valve heads. The advantage was valve seat contact and the added cooling of the valves that came with it. 1-2 psi oil pressure for every hundred rpm. I would take 2-3 oil pressure gauges to install in a rebuilt package and swap for the highest reading gauge. It's a psychological thing for the customer.
8V-71 was my favorite but they were all good engines. My grandfather rebuilt the injectors on the side for 5-7 bucks a piece in the 50's well before I was born. Good times.
If current injection technology was applied to this engine it could fix the few problems it had.
Actually, most modern unit injectors are based off the DDEC injectors.
@@randymagnum143 Thanks Randy, I wasn't aware of that.. Newer designs are better and I thought there was a company in Germany that was working on applying this newer injector tech to these old 2 cycles to better throttle injection apply. Meaning slow down the process to get ride of some of the Diesel knock and burn cleaner. I never heard if they accomplished this, might've been MTU. I haven't been keeping up with it.
The 4 cycles have the advantage of boosting at 3-4 power levels and the 2 cycle not so much but they were good at the time.
I've retired and this is running 1000psi injection pressure, Yamaha 250HP HPDI.
th-cam.com/video/MKpnwHyolwc/w-d-xo.html
@@robertjackson7590 wow, that water is flat, and you're hauling!
@@randymagnum143 I've never seen this lake that flat so yea it was nice. This is a river boat not a lake boat. There are guys I read that run 300HP engines on this hull that've seen 100-104mph. I don't have the seat time to balance it on the pad and get there. Might be balance of the boat also. Still checking this out. This is a Air Trapping Mod-Vee like a Tri Hull with a 8 1/2 inch wide pad and they raised the sponsons on each side 3 inches above the pad.
Around 60 it gets enough lift to break the sponsons loose and that's when it starts to Chine walk. We didn't have vests or any safety equipment and why I wasn't going faster, about 65-75 throttle position. If I see 75-80 with a full load I'd be fine with that.
I think this GoPro 10 camera does a great job at IM Image Stabilization clamped to the ski pylon. Everything seems faster on the water.
th-cam.com/video/VU-oMZjCHDw/w-d-xo.html
When I retired my wife said finish the boat project that I'd been gathering pieces for a decade.
If you're curious about these kind of boats the fastest boats in the world hang around here. My boat is the family sedan to some of these guys.
www.screamandfly.com/content.php?s=6acf9bdaee670268af25db939a200d75
I hope you ran the rack and check the injectors! Always nice to see a Detroit diesel come back to life!
Ran the rack and put in new fuel injectors pus fixed a rocker arm.
@@tanker70th What did you all have to do to get it running after it sat 30 years? was that all what you sent above?
@@rudycarlson8245 Changed oil, oil filter and fuel filter. Turned the engine over with the starter to get oil pressure. Replaced and timed the fuel injectors. Fixed a push rod and rocker arm assembly that was damaged. The engine started as shown in the video.
@@tanker70th wow! Are parts Still available for these engines?
@@rudycarlson8245 yes
Great video. I have had a lot of those engines in my charter boats and navy boats. They are good engines. People are still using them today. I didn't see any oil. Is there oil in that engine?
Tools and equipment all over the deck.Maybe they forgot about oil in their hurry to film it running.
🤣🤣🤣
My first time to see a Detroit was a 16 cylinder EMD 16 feet long and 10 foot high ( offshore oil rig ) was I impressed? You bet ! There were 3 engines 1- on line generating , 1- idling , and 1- off line line .( wear the motors evenly )
I wish they still made motors like this!
Thank the EPA for ruining that! the parts will still be available, because the U.S. govt. still have thousands of them.
w dont see any oil at the rockers???
Detroit steel baby, hell yea!
6 cylinders.... 71 cu in each... with a blower...gotta love Detroit Diesels man...
The blower isnt a power adder on these.
The blower is just a scavenge air pump. They won't even run without it.
I'd watch that buffer screw adjustment on that governor...sounds like it might be JUST a tad loose.
That Robertsarmory logo is just going crazy!
Love those Jimmy's
Back when American engineering was at its finest!
It's a Detroit. 30 years means nothing.
they'll be around for another 300 for sure!!
Awesome, thank you for sharing
When they were built to run forever Literally 🤗🤗😎😁
th-cam.com/video/jYL6backLLw/w-d-xo.html still running in bus-boats of ARgentina.
Thats where we got the classic GMC Roots type supercharger for our Drag machines..after NHRA banned race fuels in gas classes..
Nice ole Higgins.... what year was this one built? Good video.... you might want to consider setting the idle speed up to 550/600 unless you're having an engagement issue with the drive at a higher rpm than its at now, also didn't see any trace of oil flow on the top end.... what was the oil pressure at idle?... IF any, at that low of an idle speed. I know that it can get pretty low... ie: around 5psi and they're ok with that when the oil is at operating temp.
Idle speed is now set at approximately 400 RPM. This was the first start up in 30 years. Took time for oil to start on the top end but it did get lubricated. It has been running good to date. Oil pressure at temperature is about 5-10 psi.
that's got the old solid rack. if one injector sticks in full fuel they all are. a broken back rack cuts out the danger of a runaway. good update to do.
Very nice to see these vehicles restored, still sounds crisp too. Oil pressure seem low, is that normal for this breed of engine?
Did the oil ever get to the rocker arms? I never saw any at all.
The rocker arms were dry for the first 10 minutes of operation but lubrication finally arrived. See link at www.robertsarmory.com/higgins-boat-exhibit.html to view the lubrication.
no oil reaching the rockers?
No top end oiling? Try running a slant 6 with the cover off.
Interesting doesn't look like much oil up in the rockers .
I also noted that the LST’s these are on have full GM power- LST 325 has 2 EMD 12-567 supercharged locomotive engines and 3 6-71 generators
Dig the shovel handle controls, nothing like the Ring of a Detroit Diesel.
why does it say "battle" on the governor ? I am about to rewire for a customer an early model 64-hn9 that has been fitted with an updated head. has a shut down delay, a blower flap solenoid, fuel pressure switch, water temp manifold sender and an over temp switch i am trying to figure out as its all been disconnected.
There are two settings for the governor spring, normal and battle. The battle spring hole allows about 200-300 rpm at the top end which results in more engine wear but also an increase in boat speed. I use the normal setting.
It’s amazing it started that easily after sitting 30 years! Or was it running before?
yes that ol girl has a 2 valve head,I've had a few dealings with them also,and agree they were tuff/tuff,and and the last one I drove over the road back in the1970's I called "Greasey " in a truck only about 5 miles per gallon
Remember the external fuel rails too ?
The later two stroke detroits went and put four exhaust valves in each cylinder. I had to rebuild a 3-71 in my boat. had never worked on a diesel. i'm a shade tree mechanic. after i was done, i decided that these engines are super easy to work on and it was most lkiely the best engine i ever worked on. the engineering on these beasts are second to none.
Internal friction is why the RPM didn't really increase when he increased the throttle?
+danwat1234 also a little slop in the linkage and racks.
What you doing to the old engine bro? .just starting and show how it is still running.
This is the first try at starting. Now it is used to propel the boat as seen on the many videos on youtube.
Why do I see 3 rocker arms on each cylinder?
+hyzercreek 2 exhaust 1 fuel injector
Two for the valves, one for fuel injection.
Two outside are exhaust, the center is fuel injector. Takes a special tool to set the fuel injector hight so it pumps the right amount. These are 2 cycle so the air comes in ports in the cylinder liner on the down stroke. each stroke is a compression stroke.
I believe that seawater pipe should be at least 2" wide if you're going to run it under load, but for exhibit at no more than idle I guess that small diameter intake is ok.
Being that old, is it an open cooling system, raw seawater thru the block?
+MrTheHillfolk
Cooling system is closed with ethylene glycol/water mix and heat exchanger to sea water.
+tanker70th
Ah ok cool. Yea I've had my hands on 2 open water systems.
Generators cooled by city water, they were early 50s models , since you said it was from an earlier time , I was thinking it had an open systems too.
Thanks for the info, sounds sweet :)
@@MrTheHillfolk No, sea water through the exchanger
There's got to be rapid wear to those rocker shafts. It doesn't look like there's any oil at all
at the top of the head.
This is a start after 30 years. Took about 15 minuets at idle to get the oil to the rockers. Has run well since and is well oiled now.
@@tanker70th 👍
WOOOW amazing sound
I am a new to these Detroit’s can any one explain why there is no oil in the head after running that long ?
The rocker arms were dry for the first 10 minutes of operation but lubrication finally arrived. See link at www.robertsarmory.com/higgins-boat-exhibit.html to view the lubrication. After 30 years of sitting, it took time to get the oil throughout the system.
Is it straight-through cooled or does it have a heat exchanger?
Heat exchanger
6-71 will run all day idle to full throttle on 3 pounds of oil pressure.
That is the minimum for safely run. Drove an old gmc Twin screw tractor with a 6-71
Fully warmed up max oil pressure was 4 psi at idle and 17 psi at 2100 rpm
Maybe so but that's not in spec at all...you should have > 20psi at idle and upwards of 40psi loaded. Perhaps you were not running the correct weight oil.
I’ve got a couple of 6v53s installed new 1963 just the blower on top lots of noise and weight only delivering 195hp approx . Love them - I actually thought that 653 series was for the landing craft
53 series didn't come about until well after the war.
I have been trying to find an LCVP for a long time.. pram bow and house boat conversion SF Bay Area. Serious !
gray marine engines?
Yes, Gray Marine 64-HN9
@@SnowAndWaterSkiing the old diesels off the USS California 's 40" liberty boats all had gray marines in them when repurposed on the USS Valley Forge cvs -45 later LPH -8! in 1960's.
Sweet vid man good Ole screamin demons!
once owned an old wooden tug with a gray marine, engine hot wood idle hot at 8 psithose old engines had a chain driven oil pump
Yea a chain driven oil pump made the engine a 210 HP!
You will find the crank about on these boat motors is different to truck and stationary ones had to be careful getting exchange cranks in the day cos if you sent a boat crank back for your truck crank you got you lost your core deposit. Lot of guys never got to see year motors in multiple applications where you could have opposite direction rotation( mirror image layout) into drive gearbox or in some big pumping setups using four into drive using four mirror image layout none the same as these inline sixes could be built in four configurations, mirror image or diametrically mirror image, best to have a camera handy before disassembly rather than get part eat thru rebuild and realise you have orientation wrong lol
Why is it idling so low
It hadn't been run for over 30 years so was trying to be careful.
is this detroit a right or left rotaion?
Right rotation
Still making parts for this old gal .
top end never got any oil
I noticed that also.. wonder whats up with that ?
Daniel hoffman
Top of head was cleaned prior to start. There is oil seeping through rocker bearings. Look closely. Oil pressure is about 30 psi. After about 5 minutes more oil accumulated at the top of the head.
Top of head was cleaned prior to start. There is oil seeping through rocker bearings. Look closely. Oil pressure is about 30 psi. After about 5 minutes more oil accumulated at the top of the head.
SnowAndWaterSkiing
funny because he said "oil pressure 15 psi" and on a cold motor thats really low
the oil pressure relif valve could not be set that low
i can imagine as the motor warms the oil pressure dropping even lower
i have seen the pushrods clog up on a lot of motors like that and not give much oil if any to the rocker bearings
whithin that runn time those rockers and valve assemblys should have been covered imagine a hot motor under load trying to stay lubercated with just a few drops of oil every five minutes
it wouldent last very long
unless on purpose to demonstrate the motor to spectators they restricted or even blocked the oil completely and lubercated it manually
that that would explain the short run times that this motor will have to endure for the rest of its life and never operate on the water again
crowmagg1
Your comments are understood. Will keep an eye on this.
Wasn’t that a Gray Marine 6-71 and not a Detroit? The head to expansion tank connection made it look like a Gray. Detroit’s were a bit more squarish...
This is a Gray Marine water craft propulsion system with a GM 6-71 engine. Later they were called Detroit 6-71. Gray Marine did not manufacture the engine.
Nice!
Stock 6-71 was 238 highway around 285 hp marine version
What no oil to the top of the engion
This was first start after 30years. Oil eventually returned to the rocker arms.
Its heavy weight oil so yeah its slow .... best practice is to oil up the rockers before starting but he probably didn't know that or expect it to take so long for the oil to get there.
Want to see & hear...especially HEAR one of these apart from actually seeing one?...Watch the movie, "The thin red line"...there is an extended scene with several of these 6-71 powered boats, the 6-71s howling, turn up the volume!
or the movie all boats away where 8 higgans type lcms are towing a broken down navy ship to saftey !
3 valves?
This is a two-stroke diesel. There are 3 rocker arms per cylinder. Two are exhaust valves and the remaining one is the fuel injector. The blower provides air through the intake ports in the cylinder wall.
***** 2 exhaust, 1 injector
O would have been pouring oil on the valve train after 20 seconds , would never have waited that long, , THEY ARE A TOUGH ENGINE
After 30 years of of not having be operated?
@@tanker70th Well you should have oiled the rockers before starting, I see a little oil there but it'd be easier to tell in person.
Oil the valve gear before letting it make the sweet sweet sound .....
I believe they were GM Diesel before about 1964, at which point they took on the familiar name of Detroit Diesel...
Ok so the ones i see on gens from the old ma bell days , I can assume that?
I've come across a few in the past couple years.
There were. The one in the video looks like a Grey Marine Diesel. I have had several of them. They were built by General Motors for Grey Marine.
Sweet running engine but geez, not much in the way of top end oiling seen in this vid!
Yeah, I was waitin' for oil to come flying out everywhere! These things are over built, they last forever.
671 is one of the engines with the largest record of reliability in the world ............
I beg to differ. We had 3 or 4 of them in trucks, they were the sorriest dogs ever to hit the highway, and their reliability was, well, somewhere between okay and disappointing. The one thing that did remain constant was their unfaltering ability to leak oil. They threw it while running, and kept the dust down by dribbling out in our back lot. Loud as all-get-out, they only impressed the young lads who thought that noise was equal to power. How quickly their minds were changed when they were sent out on a long trip with anything more than an empty trailer, hahaha....
Ya i'll second that,,,good for converting diesel to noise!!!
Are Roberts Armory å private or public museum. proffit or not proffit? The answer will judge my support.
Private, not for profit.
I'm not a diesel tech, but shouldn't there be oil?.....
Since the engine sat around for 30 years, it took some time for the oil to reach the rockers. It eventually did and the engine has been running for several sailing with no problems.
@@tanker70th thanks...glad it worked out so well.
The rocker arms were dry for the first 10 miuutes of operation but lubrication finally arrived. See link at www.robertsarmory.com/higgins-boat-exhibit.html to view the lubrication.
The only suggestion is to remove tools from the walking decks around the engine for safety reason before starting :)
And oil the dry rockers...
oil pressure seems a bit low.
The engine is 75 years old with no rebuild
@@Robertsengineering What kind of oil does it take ?.... maybe time for some STP (?)
@@slippery396 takes 40W. Oil pressure runs 30 psi cold and 15 psi warm. We don't go over 800 rpm, 6 knots.
@@Robertsengineering ok .... just don't tell me you run "Pennzoil" and I'll be happy.
@@slippery396 NAPA 40W
I never saw one drop of oil on the top end.
Oil eventually came to the top end a few minutes after the video ended and has been flowing properly ever since.
Was hoping it run away lol 😂
You can trust Detroit ever vil start
No oil/pressure...wow...cool lookin
Yes
nice''
the best disel engine in the world GM Detroit Diesel Allison ; to day , part of Mercedes benz that descontinuo the 2T series A real pitty
it's a low block 2 valves per cylinder.....................
Doesn't look like an original head though cause I dont see the external fuel manifolds on it.
I hate to be one of those people but, Don't you mean 6-53...DETROIT ? ( later gray marine because they ran backwards , and no need for a special prop ).
The 6-71 series came much later, And having been in the " Brown water" navy, the P. B. R. HAD 6V-71 ENGINES. Plus the only way to keep leaking oil out of the air box was to never idle ! those N 50,60, or n-65 series injectors after a bunch of hours use, esp if you set the drag a little tight on the gauge would drip and the blower would blow the excess fuel thru the sleeve ports...............just saying........
No its a 71 series , they came out in 1936, detroit made them and gray marine marinized them. The only inline 53 series are 3 and 4 the six was a 6v53.
Thats a 6-71 Grey Marine eng.
They were just licensed to manufacture the Detroit engine... it is in fact a Detroit engine after all.
that was probably the most uneventful start up ever.. I mean if they did in fact do so much to it.. and a 30 year rest.. my God what a job.
Idling too slow. Should be 600 rpm
isn't it ironic- the company that built the.motors on the landing craft of the soldiers who TOTALLY mauled there asses is now.owned by those same asses...wtf is wrong with america people??
+scott prendergast The politicians got what we paid for.
13 psi..but close..
Sexy sounding. Gonna take it out?
Buy glycerin filled gauges.
OLD 2 VLV. HEAD.
also called 1 way engines(during th war)
fala muito