I have noticed both watching videos and watching a mechanic rebuilding a 6-71 and getting tools and parts ready for him that you old school guys never ever hardly wear plastic gloves like all the new " technicians " do. I don't care if you only speak Spanish or English but your allowed to talk while working on these old girls as I never knew a old school mechanic who didn't. Thanks for the video. Cheers!
I never could work with gloves, I needed to feel with my hands what I was doing. I admit I always had cuts, scrapes and bruises on my hands all the time.
There's a socket made especially for the fuel lines, I used the special timing pin to set the injector height, makes it easier and faster. I was working at a GMC dealership on straight 50 percent commission. We had an injector room with all the equipment to overhaul the injectors ourself. The flat rate manual paid 1 hour per injector, and you could overhaul one in 20 minutes at the most(mostly lapping small parts). an engine overhaul paid good money because you could usually beat the flat rate manual by 1/2 if you got after it. also Detroits are fun to work on.
I am 70 years old and a couple of years i had to rebuild the 3-71 world war two engine in my boat. it took a long time because i had to study this engine. youtube helped imensley, and you would be surprised how many mechanics are actually willing to waste time on the phone answering questions. I actually understand how every part on this engine works and am amazed at the engineering that went into this engine. also you don't need allot of wrenches etc to work on the thing. I have been working on all my cars have never hired a mechanic in my life. never did a diesel before. the detroit diesel was the most fun engine to work on. more moving parts per cubic inch than any other diesel out there.
4321, I agree, in the Navy we always used a timing pin. I was an EN and I worked on 2-71s, 6-71s slant 6-71s, and 6- 110s. When I was logging I drove a Timber Jack skider. I think it had a 3-57. One day coming out the woods with a jag of logs it wouldn't drop to an idle. I took the value cover off and found #2 injector jammed. I went to local dealer and got a new injector, a timing pin, and a fuel filter. I dropped the filter can expecting a very dirty filter. There wasn't one! The boss showed up and asked what I was doing. I pointed out the missing filter. He said, "oh it got dirty so I threw it away."
@@4321grp It's difficult to understand that when you buy a very expensive machine--it's not unusual to spend over $500,000. for a tractor, skidder or other heavy equipment that you don't take care of it.
That a good design not to have the injector threaded into the head and instead held in place with a hold down. I also like the way the injector lines is inside the valve cover and not outside of the engine. Looks like an amazing piece of machinery there!
You said it buddy these engines were eons ahead of there time. The common rail idea etc. Rifle drilled fuel passages. Many 71s did a million miles in a truck or 25000 hrs in a bulldozer before an overhaul
U know it’s always a good idea to push the inj away from the rack ball (inj control rack arm) because there is a dowel pin on the bottom of the inj & the hole on the cyl head & there is a little slop there & the reason is u don’t want the inj C arm control rod touching twice up against the inj control arm lever (only one place should be touching that arm & then torque to 25lbs) & u did a good job !
U should always use paper towels instead of linen rags cause lint can get into bearings and injectors and other crap.awesome video. Love these old 2 strokes. Coolest diesel engines ever and the coolest sounding.
It is a lot easier if you have the right tools for injector timing, push rod adjustment, fuel lines, and so on. Also easier after you have done a few, when you develop the "touch" for setting the racks!
I have a few questions about my Detroit 8.2. It set up for about 10 years so I changed the fuel and fuel filters and it started right up with the help of about a whole can of starting fluid spray. The RPMs were good and I let it idle for about an hour. Then when I started to back it up out of the yard I got stuck a little and started rocking back and forth to get out of the mud, plus I had to hop over a few rocks in the yard so the fuel tank got a pretty good shake up. While I was rocking it back and forth to get out of the mud it started running real rough. It would idle real low but when I tried to accelerate it would start to die out so all I could do to keep it running was to barely pat the peddle a little and then finally I let off the throttle altogether and it idled on its own at that point. I then pulled the fuel filters off and the first filter was pretty rough. It was milky and had a lot of trash in it, including a wasp and a lady bug. The second filter looked good but it was half way empty. So I primed and changed both filters but the motor still ran the same. So I took both filters back off and the first filter still looked clean and the second one was clean and half empty again. The fuel cap had been off for quite a few years I imagine and I couldn't find the cap anywhere. What are the chances that the injectors are clogged? Or is there something else I should try first. I did take the return line off to see if it was getting fuel and it did start pumping fuel out after about half a minute after it started. I think it is a whole lot more likely that trash got up in the system than the fuel pump going out all at once. Any ideas? It will start and idle but the RPMs won't rev up. I checked the throttle linkage too and it seems to be okay.
I was thinking maybe I should modify a filter where I can attach an air line to it so that I can run some compressed air back through the fuel line from the first filter back to the tank.
Injector replacement is the easiest job there is on a detroit with the proper tools which includes having that line socket which is a must to avoid damaging those fittings
Several things I'll mention in this "non tutorial" . If you have these engines , spend the money on the 1/2" deep line socket and the 1/2" and 5/16" tuneup wrenches , a timing tool is cheap , unless you spend the 200 bucks for a dial indicator tool . The torque on the bolts is about 25 / injector hold down .. 90 / rocker stands .. 10-12 / jumper lines .. I might add you're only supposed to use those old style lines once but a lot of people reuse them . Another thing about that is you're supposed to pressurize the fuel system to check for leaks in those lines , or you run the risk of filling the crankcase with fuel . The injector tube should be thoroughly clean . Removing an injector that's been leaking on these engines is a bitch , and sometimes results in tube failure , necessitating a head removal .
+Ignignokt Mooninite I will admit that I was very lucky that I didn't need to remove the head to replace the injector tubes. What is not shown is this video is that I did a visual inspection of each tube with a bore scope to make sure they were not in too bad of condition. It was also apparent from the condition of the injectors that I removed that there was not any obvious problems. I also checked the rocker lash with a feeler gauge and was lucky there also as I didn't have to adjust any of them as they were all within spec.
It depends on how many times the tube has been reused, and the condition of the flare on the end of the tube, I agree that any mechanic who's not experienced on Detroits would be better off to go ahead and replace the tubes.
for how much goes on under the valve covers of an old 2 stroker, they really are simple and straight forward to work on. just gotta know your measurements. really the only thing that is a pita is running the racks.
+Nathan Dial Yes they are exhaust valves (4 per cylinder). This is a 2 stroke engine the intake of air is achieved as the piston passes below the ports at the bottom of the cylinder.
Colega buenas tardes un gusto saludarle desde Ecuador me puede indicar el despiece de Inyectores del Motor Detroit 4-71 necesito revisar los microfiltros
@@zimtok thanks 😊 I've just removed the injectors from my 8v71n marine that was wet stacking I found copper washers stuck in the tubes 😪😪 I removed them just hope they seal when put back
Sorry to bother you again experts like yourself are hard to find these days Can I ask you this , is it normal when the engine is stopped the rack returns to what looks like full open position?
@@johnbaggus9966 I’m far from an expert but thanks. The rack does return to full throttle after sitting. I assume it is because the governor is not spinning and the air pressure is depleted that shuts down the engine. It takes air pressure to move the rack to shut off the fuel.
@@johnbaggus9966 You saw how I did mine and they sealed just fine. There is a special tool that reams/cleans the seat but I didn’t have it and took the chance. It been good for 10 years.
paulo sartori. gostaria de consiguir manuais de taller para montagem de motores detroit series 53 e 71, em lingua espanhola ou portugues. e possivel baixar no adobe rieder?
Alguien que me pueda orientar tengo un 453 no prende nomás estarea cómo si el ahogador estuviera jalado como funciona ese sistema saludos desde tamaulipas
+bud morse I may not have had the proper tools but I did manage to get it done. It has been running great for the past 5 years. We run the bus at least once a week for local gigs 60-120 miles and have done several longer trips 3-5k miles without any problems.
Dear Srs: This is a very old type of diesel motor, the position of the injector inside the head motor bring oil contamination with fuel, also the dificulty of mounting/demounting.This motor is a old glory, we must see ahead, look my INVENTION OF DIESEL MOTOR 2 STROKES BY VALVES THAT SAVE THE 30% OF FUEL AND INCREASE POWER TO DOUBLE WITH HALF POLLUTION
I have a bus with this American engine, it cranks but doesn't run.I was told that it ran great but I can't seem to start it.my quest is, how does it work.I'm a gasoline mechanic not a diesel dude.any info would be gratefully appreciated. I have new batteries, fuel and zero patients
Buen trabajo amigo, soy mecánico en tijuana México y me sigo superando ,admiró tu video y gracias por la enseñanza, espero algún día poder visitar tu país, y encontrar mejores oportunidades ...bendiciones...
You yanked the injector out so fast no body got to see it. Also, as long as you have the mic on, describe what you're doing. Many people watching are not experienced at this.
I have noticed both watching videos and watching a mechanic rebuilding a 6-71 and getting tools and parts ready for him that you old school guys never ever hardly wear plastic gloves like all the new " technicians " do.
I don't care if you only speak Spanish or English but your allowed to talk while working on these old girls as I never knew a old school mechanic who didn't.
Thanks for the video.
Cheers!
I never could work with gloves, I needed to feel with my hands what I was doing. I admit I always had cuts, scrapes and bruises on my hands all the time.
There's a socket made especially for the fuel lines, I used the special timing pin to set the injector height, makes it easier and faster. I was working at a GMC dealership on straight 50 percent commission. We had an injector room with all the equipment to overhaul the injectors ourself. The flat rate manual paid 1 hour per injector, and you could overhaul one in 20 minutes at the most(mostly lapping small parts). an engine overhaul paid good money because you could usually beat the flat rate manual by 1/2 if you got after it. also Detroits are fun to work on.
I am 70 years old and a couple of years i had to rebuild the 3-71 world war two engine in my boat. it took a long time because i had to study this engine. youtube helped imensley, and you would be surprised how many mechanics are actually willing to waste time on the phone answering questions. I actually understand how every part on this engine works and am amazed at the engineering that went into this engine. also you don't need allot of wrenches etc to work on the thing. I have been working on all my cars have never hired a mechanic in my life. never did a diesel before. the detroit diesel was the most fun engine to work on. more moving parts per cubic inch than any other diesel out there.
4321, I agree, in the Navy we always used a timing pin. I was an EN and I worked on 2-71s, 6-71s slant 6-71s, and 6- 110s. When I was logging I drove a Timber Jack skider. I think it had a 3-57. One day coming out the woods with a jag of logs it wouldn't drop to an idle. I took the value cover off and found #2 injector jammed. I went to local dealer and got a new injector, a timing pin, and a fuel filter. I dropped the filter can expecting a very dirty filter. There wasn't one! The boss showed up and asked what I was doing. I pointed out the missing filter. He said, "oh it got dirty so I threw it away."
@@Canopus68,guys like your boss kept us Detroit Diesel mechanics employed. I've run across many things like that, that people have done.
@@4321grp It's difficult to understand that when you buy a very expensive machine--it's not unusual to spend over $500,000. for a tractor, skidder or other heavy equipment that you don't take care of it.
@@Canopus68 , I agree, but that's common.
That a good design not to have the injector threaded into the head and instead held in place with a hold down. I also like the way the injector lines is inside the valve cover and not outside of the engine. Looks like an amazing piece of machinery there!
You said it buddy these engines were eons ahead of there time. The common rail idea etc. Rifle drilled fuel passages. Many 71s did a million miles in a truck or 25000 hrs in a bulldozer before an overhaul
Muy buen video, gracias por compartirlo para que sepamos como hacerlo saludos desde Saltillo Coahuila México 👍
great video I've been looking for this information right through u tube many tha nks
U know it’s always a good idea to push the inj away from the rack ball (inj control rack arm) because there is a dowel pin on the bottom of the inj & the hole on the cyl head & there is a little slop there & the reason is u don’t want the inj C arm control rod touching twice up against the inj control arm lever (only one place should be touching that arm & then torque to 25lbs) & u did a good job !
Si en español 6:39
I like that you used the calipers instead of the $ 600.00 dollar dial indicator.
U should always use paper towels instead of linen rags cause lint can get into bearings and injectors and other crap.awesome video. Love these old 2 strokes. Coolest diesel engines ever and the coolest sounding.
It is a lot easier if you have the right tools for injector timing, push rod adjustment, fuel lines, and so on. Also easier after you have done a few, when you develop the "touch" for setting the racks!
Thanks for the great vid, sure i read the manual but seeing something is a great help before doing the same job.
very good video man. should post a nother one how too do a tune up on a 671 or somthin.
Old skool, no gloves, no razor blades, no commentary.
I'm an old school mechanic, and I praise the mechanic who made it practicle for mechanic to wear surgical gloves!
I have a few questions about my Detroit 8.2.
It set up for about 10 years so I changed the fuel and fuel filters and it started right up with the help of about a whole can of starting fluid spray. The RPMs were good and I let it idle for about an hour. Then when I started to back it up out of the yard I got stuck a little and started rocking back and forth to get out of the mud, plus I had to hop over a few rocks in the yard so the fuel tank got a pretty good shake up.
While I was rocking it back and forth to get out of the mud it started running real rough. It would idle real low but when I tried to accelerate it would start to die out so all I could do to keep it running was to barely pat the peddle a little and then finally I let off the throttle altogether and it idled on its own at that point.
I then pulled the fuel filters off and the first filter was pretty rough. It was milky and had a lot of trash in it, including a wasp and a lady bug. The second filter looked good but it was half way empty. So I primed and changed both filters but the motor still ran the same. So I took both filters back off and the first filter still looked clean and the second one was clean and half empty again.
The fuel cap had been off for quite a few years I imagine and I couldn't find the cap anywhere.
What are the chances that the injectors are clogged? Or is there something else I should try first. I did take the return line off to see if it was getting fuel and it did start pumping fuel out after about half a minute after it started. I think it is a whole lot more likely that trash got up in the system than the fuel pump going out all at once.
Any ideas? It will start and idle but the RPMs won't rev up. I checked the throttle linkage too and it seems to be okay.
I was thinking maybe I should modify a filter where I can attach an air line to it so that I can run some compressed air back through the fuel line from the first filter back to the tank.
Never mind. That did the trick! Whoo hoo!
Injector replacement is the easiest job there is on a detroit with the proper tools which includes having that line socket which is a must to avoid damaging those fittings
Wire Nuts ! What a great idea!
There a socket you can get or make you your own. Ether way it makes the line removal eazy and you do it the correct way
Its the injektor adjust fore the right presure ,? So only to bolt on..?
OH !! OH !! .. I think that 36 mechanics don't like this tutorial ....
(but for mi was great video jeeeejejejeejeejee )........... CHEERS
Several things I'll mention in this "non tutorial" .
If you have these engines , spend the money on the 1/2" deep line socket and the 1/2" and 5/16" tuneup wrenches , a timing tool is cheap , unless you spend the 200 bucks for a dial indicator tool .
The torque on the bolts is about 25 / injector hold down .. 90 / rocker stands .. 10-12 / jumper lines .. I might add you're only supposed to use those old style lines once but a lot of people reuse them . Another thing about that is you're supposed to pressurize the fuel system to check for leaks in those lines , or you run the risk of filling the crankcase with fuel . The injector tube should be thoroughly clean . Removing an injector that's been leaking on these engines is a bitch , and sometimes results in tube failure , necessitating a head removal .
+Ignignokt Mooninite
I will admit that I was very lucky that I didn't need to remove the head to replace the injector tubes.
What is not shown is this video is that I did a visual inspection of each tube with a bore scope to make sure they were not in too bad of condition. It was also apparent from the condition of the injectors that I removed that there was not any obvious problems.
I also checked the rocker lash with a feeler gauge and was lucky there also as I didn't have to adjust any of them as they were all within spec.
Thanks for these tips on the proper tools!
Any tips as to where a good source is to buy new fuel lines?
@@h.l.devore9322 PC Industries out of wyoming has everything you could ever hope to need for a detroit. Great pricing, fast shipping too.
A twelve point crows foot would do wonders for the fuel lines. Great video!
There is a socket wrench that wraps around the injector fuel lines making it much easier to remove and replace.
This man will learn the hard way that fuel crossover tubes are only to be used once then replaced..
It depends on how many times the tube has been reused, and the condition of the flare on the end of the tube, I agree that any mechanic who's not experienced on Detroits would be better off to go ahead and replace the tubes.
Pretty easy to run it and check for leaks.
I'm gen X DOING THIS AT 10 YEARS OLD
for how much goes on under the valve covers of an old 2 stroker, they really are simple and straight forward to work on. just gotta know your measurements. really the only thing that is a pita is running the racks.
out of curiosity and of laziness to find out myself, does this engine have two or three valves per cylinder, and is this direct injection?
It has four exhaust valves per cylinder. This is a 2 cycle diesel, intake air is in the liner holes.
those are all exhaust valves in the head right
+Nathan Dial
Yes they are exhaust valves (4 per cylinder). This is a 2 stroke engine the intake of air is achieved as the piston passes below the ports at the bottom of the cylinder.
@@zimtok hey brother, can you explain to me the torque specs on a 8v71 fuel injectors? I'm a greenhorn
there is a special socket for the fuel jumper lines
Thank you very helpful
G M good engine I like him.
Great video. Many thanks!
Colega buenas tardes un gusto saludarle desde Ecuador me puede indicar el despiece de Inyectores del Motor Detroit 4-71 necesito revisar los microfiltros
hola,cuando la máquina pasa diésel al radiador.. se supone que es por que un inyector anda. fallando y en ese caso k se requiere hacer..
Muchas gracias Señor
a set of those line sockets are less than a hundred bucks well worth the investment
they make a deepwell 1/2 inch with the side cut out specifically for a 2 cycle detroit, no need to buy a set that doesnt work..
Great video. This really helped me out
U do work on truck engine,s 8v92 twin turbo and the 16v 92 need ah mech for cabover project
How does the injector get sealed in the injector sleeve?
The injector has a tapered end that is fit to the sleeve internal taper.
The torqued hold down holds it in place and seals it.
@@zimtok thanks 😊 I've just removed the injectors from my 8v71n marine that was wet stacking I found copper washers stuck in the tubes 😪😪 I removed them just hope they seal when put back
Sorry to bother you again experts like yourself are hard to find these days
Can I ask you this , is it normal when the engine is stopped the rack returns to what looks like full open position?
@@johnbaggus9966
I’m far from an expert but thanks.
The rack does return to full throttle after sitting. I assume it is because the governor is not spinning and the air pressure is depleted that shuts down the engine. It takes air pressure to move the rack to shut off the fuel.
@@johnbaggus9966
You saw how I did mine and they sealed just fine.
There is a special tool that reams/cleans the seat but I didn’t have it and took the chance. It been good for 10 years.
paulo sartori. gostaria de consiguir manuais de taller para montagem de motores detroit series 53 e 71, em lingua espanhola ou portugues. e possivel baixar no adobe rieder?
Geez... this really is a shrunken version of GM's locomotive diesels.
Яаз-204 копия Дмитрий регулировка форсунок ленкор высота 37,7 мм
hola quirero saber cual es la medida o calibracion dei inyector del detroit 271
inyector N60
Thank you!!!!!
I didn't see a new seal washer put in the injector tube after cleaning. And it didn't look like any NeverSeize was put on the injector.
+gravelydon No seal washer on a Driptroit . The injector presses down on the copper tube where it meets the head at the tip .
how did you do that?
Porque se acelerar que tiende a desbacar el motor
Alguien que me pueda orientar tengo un 453 no prende nomás estarea cómo si el ahogador estuviera jalado como funciona ese sistema saludos desde tamaulipas
Thank you
Very Good!
good job, thaks
wow it is a big job.
easy job he doesnt have the proper tools
+Douglas Morrison Correct. They make a socket wrench just for that job that makes it easy.
+bud morse
I may not have had the proper tools but I did manage to get it done.
It has been running great for the past 5 years. We run the bus at least once a week for local gigs 60-120 miles and have done several longer trips 3-5k miles without any problems.
good job
no sabia donde estaban los inyectores
Nope. 4 on this engine. Older ones had two, however. No intake valves on a two stroke.
Dear Srs: This is a very old type of diesel motor, the position of the injector inside the head motor bring oil contamination with fuel, also the dificulty of mounting/demounting.This motor is a old glory, we must see ahead, look my INVENTION OF DIESEL MOTOR 2 STROKES BY VALVES THAT SAVE THE 30% OF FUEL AND INCREASE POWER TO DOUBLE WITH HALF POLLUTION
They make a socket just for that I got mine 30 years ago
Watch closely one rocker works the injector :-)
hola si algien me pudiera ayuda para correr el rack de un gm diesel detroit 6 -71
Sorry buddy you can't use the crab holddown to seat injectors , warming will Robinson
I have a bus with this American engine, it cranks but doesn't run.I was told that it ran great but I can't seem to start it.my quest is, how does it work.I'm a gasoline mechanic not a diesel dude.any info would be gratefully appreciated. I have new batteries, fuel and zero patients
Buen trabajo amigo, soy mecánico en tijuana México y me sigo superando ,admiró tu video y gracias por la enseñanza, espero algún día poder visitar tu país, y encontrar mejores oportunidades ...bendiciones...
setting the rack!
You yanked the injector out so fast no body got to see it. Also, as long as you have the mic on, describe what you're doing. Many people watching are not experienced at this.
So.....it ran away after this...and the motor grenaded....
2 exhaust valves per cylinder
@Mr Sunshines The old Detroits had two valves per cylinder
There were some really old industrial engines out there that were made in the 40s or early 50s
Those lines arent nearly that hard to get off when you spend the 10 bucks for that line socket to fit them
es de un detroit S50
+José Molina
It is a 1960 Detroit Diesel 6-71.
The 6 is referring to the number of cylinders, the 71 is the cubic inches per cylinder.
+José Molina
Es un 1960 Detroit Diesel 6-71.
El 6 se refiere al número de cilindros, el 71 es el pulgadas cúbicos por cilindro.
4 exhaust valves per cylinder*
this is a 2 stroke.
U missed 3 adjustments and you don't have the proper tools
Tests, same engine not American