Haven't watched the whole video yet but I'm betting its the exhaust gasket. Happened exactly like that on my 74 50hp. There are several REALLY thin spots on the water shield gasket that lets hot exhaust get blown by if the water flow isn't working ideally. Especially if someone runs it on muffs and starts at high idle where the explosion ends up in the exhaust galleries due to lack of back pressure. EDIT: Yup! That's exactly what the water gallery gaskets on the exhaust cover I had looked like. And yes, the bolt issue ugh and I ended up custom ordering them and you can get the exact ones but they aren't cheap.
Great vid I have 2 x 70hp Evinrudes 1973 vintage which are immaculate on my 24 footer. Brilliant vid in now I know what to look for.😊 they will get thorough going iver once resto finished later this year😮. Keep at it chap😅
I had a 1974 135 hp Silver Starflight Evinrude and it had the same style trim and tilt. I liked those old OMC motors and that one is in exceptional shape.
I have a great junk pile of these triples due to this problem. There was a tech bulletin and update to the exhaust plates. The plate warps at the port allowing pressurized water to blast into the jug. The fix is find an 80's parts engine with the thicker port plate. Generally I find a resurface of the plates gets the engine a couple hours of run time before the leak starts again. BTW my manuals call for QL77J4C plugs. Not surface gap.
Really enjoy watching you work Brandon. Wish I had more of your patients and determination. You've taught me a lot about OMC, and I really appreciate that.
This thing looks like it's been taken out once per year, at most. It's great that you were able to repair the motor, so this boat can go out once per year in the future.
Very nice boat and excellent repair! I have a '72 Johnson 65 which is very similar. I get my boat out about once a week for 6 months out of the year in New York State. It sat for decades due to rot, but new deck and transom got her a new life. There is still a lot of life left in the motor. I wish I had power tilt. I have motor envy now!
You did a great repair job. Some of those dealerships crack me up when they say that they do not work on vintage outboard motors. I can understand why as well when they are charging over a $100.00 an hour, and a lot may be wrong with the old motors etc. More money in your pocket, and it is good that a skilled mechanic as yourself is in that area too.
2 words: stuck and screws. the other thing is 90% of the guys that knew 2 strokes are long gone. you'd be shocked at how todays mechanics wont even touch a carb let alone rebuild one! takes me 25 min.
@@ct1762 I'm a former OMC 2 stroke Tech and left the trade in 2015, I knew nothing else but Johnson and Evinrude 2 stroke and couldn't make the transition to 4 strokes. Can't teach an old dog new tricks.
As a retired, OMC technician, I can say you did this job absolutely correct by the book there is a very clean motor deserves to be taken well care of great video again good work
I am quite the expert on those triples. I have parts for that motor if you want. The absolute best performance enhancer for those 70s 70-75 are performance reeds. Not a high dollar part but man do they make a world of diff
Good to know. I just put a replacement powerhead ($100 eBay find!) on a ‘73 Evinrude 65. Keeping all the spare parts from the old blown block. Just gotta cure some carb needle issues, adjust the shift cable and get her on the water.
man thats a clean motor! Still lucky to get all those screws out. exhaust plates really need to be taken to a machine shop but then again if they are under .004'' warped the gaskets will seal it just fine.
Ouch, boats and motors I worked on when new in the mid-seventies are now antiques. Boat yard I worked at sold MFG boats, and their equivalent to that one would have been the Gypsy. And that was a popular color, too!
Always use gasket sealing compound on OMC head gaskets, Having just said that in fresh water use it 's not earth shattering if you don't. These are the little things you learn as a factory trained Tech. Also use QL77JC4 spark plugs not surface gap, the ignition system does not quite generate enough oomph to jump the auxiliary gap as well as the surface gap. It will also idle better (less plug fouling) and start easier.
Hi Brandon. You do A-1-A on your videos. I have the same problem on my 1990 johnson 40. I did what you did on this video, plus replace the water supply grommet. I'm still getting water in the cylinders. A small amount, but enough to notice. What's next for me? I did not detect any cracks in the block etc. I also inspected the Reed block n changed that intake gasket. Thanks bud. By the way, you must be related to Max Muncy from the Dodgers!!
Love to see freshwater motors or motors that folks flush out the salt...here on the west coast a number dealers will not even change out an impeller for less than $350 up front...then the customer says the motor is not worth $350...Salt on the Pacific Coast is nasty...some dealers will not work on a salt water motor over 10 years old...
I'm a Merc. Fanatic but will give credit to these triple OMCs. Anyone that knows smokers should remember, cylinders like working in 3s and 4s or multiples of. I usually check clearance and toss the head gasket to get the last life outta these old OMCs. They like compression and good fuel.
Excellent... those old E/J 70's are super duper motors. I have 3. Getting someone to do something like what your are doing is... well a joke! "badges" on the seat... we don't need no stinkin' badges so... ;-)
awesome video!! such a nice looking boat. Glad they found you to work on it. funny to here your daughter in the back ground, love it. nice to see you trouble shooting the problem, not like most places (we don't work on that old of boats!!). wondering if you have found any info. on the tilt and trim unit? looking for the hydraulic flow diagram.
When they do start, they sound like they're going straight up!! Well, he takes off across the lake, like all same, courteous, responsible boatmen do. On his way out, he takes 2 fishermen, & 1 waterskier.............
The wiring is usually the first thing to go west you cant even fix it the corruption travels inside the insulation lucky the 2 stroke is a simple beast - does this model have reeds
my 0ld 50 hp Mercury is not getting water and it apprears it is leaking at the top of the pick up tube. Not from the seal around the top of the tube but out the side of a fitting. I;m guessing the bleed hose came off at the bottom. You can see it looking up from the bottom. Can it be fixed without removing power head?
Hi Brandon just wondering if you have an email.... my husband is looking for someone to repair his boat.. he really enjoys watching your videos and needing some help
I am assuming that you are or had to replace the exhaust baffle plate because it may be compromise with a hole which is allowing water into the cylinder. I am having the same problem with my 50 hp mercury is in the shop as of right now lol ran my 50 hp mercury Couple weeks ago ran great for about a mile and the bottom two cylinder started dropping off, 😂water in the cylinder not a lot of water, but it doesn’t take a lot of water to kill a cylinder. what’s the old saying water and fuel does not mix. 😂
Brandon, Is there any good way to remove a cylinder head from an old outboard without breaking a head bolt? So far I am scared to try it. I have an old 1987 88hp Evinrude. I had overheat problem, replaced T - stats, and cleaned water jackets. I Broke a couple bolts on water jackets but was able to get them out. Still get overheat alarm once in a while. I want to remove heads to change out rubber water diverters but I am deadly afraid of breaking head bolts. Any suggestions? Thanks.
If you can get at them, it’s a good idea to give them all a good whack on the head as it tends to break the grip of all the corrosion and oxide that builds up in the bolt hole. Heating the block with a propane torch can expand it and loosen the grip it has on the bolt. Also work the bolt both ways back and forth once it undoes a little bit. That’s because gunk gets caught in the threads and the bolt can become tighter as it unscrews (when ch seems counter-intuitive. CRC or diesel/penetrating oil also helps.
Haven't watched the whole video yet but I'm betting its the exhaust gasket. Happened exactly like that on my 74 50hp. There are several REALLY thin spots on the water shield gasket that lets hot exhaust get blown by if the water flow isn't working ideally. Especially if someone runs it on muffs and starts at high idle where the explosion ends up in the exhaust galleries due to lack of back pressure.
EDIT: Yup! That's exactly what the water gallery gaskets on the exhaust cover I had looked like. And yes, the bolt issue ugh and I ended up custom ordering them and you can get the exact ones but they aren't cheap.
Great vid I have 2 x 70hp Evinrudes 1973 vintage which are immaculate on my 24 footer. Brilliant vid in now I know what to look for.😊 they will get thorough going iver once resto finished later this year😮. Keep at it chap😅
I had a 1974 135 hp Silver Starflight Evinrude and it had the same style trim and tilt. I liked those old OMC motors and that one is in exceptional shape.
I have a great junk pile of these triples due to this problem. There was a tech bulletin and update to the exhaust plates. The plate warps at the port allowing pressurized water to blast into the jug. The fix is find an 80's parts engine with the thicker port plate. Generally I find a resurface of the plates gets the engine a couple hours of run time before the leak starts again.
BTW my manuals call for QL77J4C plugs. Not surface gap.
Really enjoy watching you work Brandon. Wish I had more of your patients and determination. You've taught me a lot about OMC, and I really appreciate that.
That thing is in amazing shape. So cool.
This thing looks like it's been taken out once per year, at most. It's great that you were able to repair the motor, so this boat can go out once per year in the future.
Very nice boat and excellent repair! I have a '72 Johnson 65 which is very similar. I get my boat out about once a week for 6 months out of the year in New York State. It sat for decades due to rot, but new deck and transom got her a new life. There is still a lot of life left in the motor. I wish I had power tilt. I have motor envy now!
@@stephen8117 That is interesting. What changed to gain the extra 5HP?
We had a 70, it was the diggingest motor ever for pulling out skiers. Had it 7 years in the 70’s. A great running, powerful motor
Sure is a pleasure to work on such a clean motor, they very very rarely Come in in such a great stade ! Thanks for sharing, Brandon.
"My arm's a little tired from patting myself on the back"😂😂😂😂😂
You did a great repair job. Some of those dealerships crack me up when they say that they do not work on vintage outboard motors. I can understand why as well when they are charging over a $100.00 an hour, and a lot may be wrong with the old motors etc. More money in your pocket, and it is good that a skilled mechanic as yourself is in that area too.
2 words: stuck and screws. the other thing is 90% of the guys that knew 2 strokes are long gone. you'd be shocked at how todays mechanics wont even touch a carb let alone rebuild one! takes me 25 min.
No more
@@ct1762 I'm a former OMC 2 stroke Tech and left the trade in 2015, I knew nothing else but Johnson and Evinrude 2 stroke and couldn't make the transition to 4 strokes. Can't teach an old dog new tricks.
As a retired, OMC technician, I can say you did this job absolutely correct by the book there is a very clean motor deserves to be taken well care of great video again good work
Nice save on that one ! Nice boat and motor combo. The yellow and green go well together too
I am quite the expert on those triples. I have parts for that motor if you want. The absolute best performance enhancer for those 70s 70-75 are performance reeds. Not a high dollar part but man do they make a world of diff
Good to know. I just put a replacement powerhead ($100 eBay find!) on a ‘73 Evinrude 65. Keeping all the spare parts from the old blown block. Just gotta cure some carb needle issues, adjust the shift cable and get her on the water.
Great video! I really liked the bolts in the cardboard trick! Very cool old boat.
Brandon you sir are a excellent mechanic.
I believe you do some very honest work.🎉🎉🎉🎉🎉😅😅😅😅😅
man thats a clean motor! Still lucky to get all those screws out. exhaust plates really need to be taken to a machine shop but then again if they are under .004'' warped the gaskets will seal it just fine.
Ouch, boats and motors I worked on when new in the mid-seventies are now antiques. Boat yard I worked at sold MFG boats, and their equivalent to that one would have been the Gypsy. And that was a popular color, too!
I would love to have that as my weekend cruiser.. That boat was such a freaking beauty. Great work.
Always use gasket sealing compound on OMC head gaskets, Having just said that in fresh water use it 's not earth shattering if you don't. These are the little things you learn as a factory trained Tech. Also use QL77JC4 spark plugs not surface gap, the ignition system does not quite generate enough oomph to jump the auxiliary gap as well as the surface gap. It will also idle better (less plug fouling) and start easier.
Hi Brandon. You do A-1-A on your videos. I have the same problem on my 1990 johnson 40. I did what you did on this video, plus replace the water supply grommet. I'm still getting water in the cylinders. A small amount, but enough to notice. What's next for me? I did not detect any cracks in the block etc. I also inspected the Reed block n changed that intake gasket.
Thanks bud. By the way, you must be related to Max Muncy from the Dodgers!!
Love to see freshwater motors or motors that folks flush out the salt...here on the west coast a number dealers will not even change out an impeller for less than $350 up front...then the customer says the motor is not worth $350...Salt on the Pacific Coast is nasty...some dealers will not work on a salt water motor over 10 years old...
I'm a Merc. Fanatic but will give credit to these triple OMCs. Anyone that knows smokers should remember, cylinders like working in 3s and 4s or multiples of. I usually check clearance and toss the head gasket to get the last life outta these old OMCs. They like compression and good fuel.
I enjoy watching your videos anyway but this one today with the show being stolen by your youngster was the best yet !! 👍🏻
28:30
FYI denatured alcohol is fantastic at removing that gasket sealant. Even after it’s set up.
Beautiful older boat you did a great job fixing it
Excellent... those old E/J 70's are super duper motors. I have 3. Getting someone to do something like what your are doing is... well a joke! "badges" on the seat... we don't need no stinkin' badges so... ;-)
awesome video!! such a nice looking boat. Glad they found you to work on it. funny to here your daughter in the back ground, love it. nice to see you trouble shooting the problem, not like most places (we don't work on that old of boats!!). wondering if you have found any info. on the tilt and trim unit? looking for the hydraulic flow diagram.
I would use Permeates High Tack with that. Makes a very good seal with two stroke marine applications.
Your kid is hilarious
Which one, the pumpkin on the head, or moving the tripod to watch the screen while I record?
The good old permatex Aviation shellac I can't believe they still make that stuff
That boat came out of a time machine! Even with such low hours corrosion still presents it's ugly head.
Im in MN and i love working on them old outboards especially evinrudes
I worked on this boat this spring and found the head gasket leak,I live in MN and just happened to see this video
Yes every part of that boat is original. The wiring how ever is not. I did the wiring about 7 or 8 years ago.
I would love to have that as my weekend cruiser.
When they do start, they sound like they're going straight up!! Well, he takes off across the lake, like all same, courteous, responsible boatmen do. On his way out, he takes 2 fishermen, & 1 waterskier.............
Wow, what a creampuff museum piece of a boat and motor.
I believe this is what is wrong with my 1964 28HP Speeditwin.
Great stuff as always!
Good Job…. At a Marine Shop that would have been exorbitantly expensive.
That boat was such a freaking beauty. Great work
Heard you mention AZ in video. Interested in having a 1975 Evinrude 115 v4 worked on. Please reach out. Thank you for great educational videos
Nice work on the repair!
Hydrolocked is the word you were looking for.
Might want to look into getting an induction heater for bolts and nuts when you don’t want to use a torch.
I have that same motor is there anything I can do performance parts wise to get more out of the motor?
Brad, I would have put the lower unit in a trash can and let the engines pump circulate the water. JMO Ken
Anti-seize on the bolts, not gasket sealing compound.
I want to put a pumpkin on my head too.
Well done!! Thank u for sharing!!😊😊 Gus🇳🇴
The wiring is usually the first thing to go west you cant even fix it the corruption travels inside the insulation lucky the 2 stroke is a simple beast - does this model have reeds
my 0ld 50 hp Mercury is not getting water and it apprears it is leaking at the top of the pick up tube. Not from the seal around the top of the tube but out the side of a fitting. I;m guessing the bleed hose came off at the bottom. You can see it looking up from the bottom. Can it be fixed without removing power head?
I had one of those outboards for years water only comes out of those ports when it’s in the water never from the hose
Before you know it you’re daughter will be asking for the keys to the car.
Garage kept from day 1 not even joking.
Hi Brandon just wondering if you have an email.... my husband is looking for someone to repair his boat.. he really enjoys watching your videos and needing some help
I had a 60 horse in the 90s exactly like that. on a 17ft glasspar
I am assuming that you are or had to replace the exhaust baffle plate because it may be compromise with a hole which is allowing water into the cylinder. I am having the same problem with my 50 hp mercury is in the shop as of right now lol ran my 50 hp mercury Couple weeks ago ran great for about a mile and the bottom two cylinder started dropping off, 😂water in the cylinder not a lot of water, but it doesn’t take a lot of water to kill a cylinder. what’s the old saying water and fuel does not mix. 😂
Thanks! I learned some stuff ...
Great vid. Love the kids. 😂
Brandon, Is there any good way to remove a cylinder head from an old outboard without breaking a head bolt? So far I am scared to try it. I have an old 1987 88hp Evinrude. I had overheat problem, replaced T - stats, and cleaned water jackets. I Broke a couple bolts on water jackets but was able to get them out. Still get overheat alarm once in a while. I want to remove heads to change out rubber water diverters but I am deadly afraid of breaking head bolts. Any suggestions? Thanks.
If you can get at them, it’s a good idea to give them all a good whack on the head as it tends to break the grip of all the corrosion and oxide that builds up in the bolt hole. Heating the block with a propane torch can expand it and loosen the grip it has on the bolt. Also work the bolt both ways back and forth once it undoes a little bit. That’s because gunk gets caught in the threads and the bolt can become tighter as it unscrews (when ch seems counter-intuitive. CRC or diesel/penetrating oil also helps.
Grease or loctite on the bolt threads, what do you think?
How's the water situation Lake Mead and Lake Powell?
Nice work and my one are also all day on mindgraft
i dont have this motor but have same tilt and trim i gotta find out where i can get a ram seal kit
lol 1974... Mustard yellow was in
The head bolt torque should have been explained thats INCH pounds!
wish you lived in Va!!!!!
Nice bolt hack. Job well done. 😊
I wonder what a job like that would cost, seem really labor-intensive.
Awesome job
Sweet Eng
Far rather fit the NGK plugs that the champion
you need a better sraight edge, the flexibility of that one could mislead
a scale is not a straight edge anyways
Time capsule.
that was it at 33
They cant even repair there own engine and there out on the water
Please help me fix my 74 Glastron tri. 50 Johnston. 😎✌️
This boat belongs in a museum, I’d say it’s never seen salt water.
I’d say there would be collectors that would love this boat.
😮
Hi brandon, do you have an email or contact info?