I have a Yanmar 3GM30F Engine.. It has developed a leak at the gasket for the timing cover... Looks like a real bear to replace? Has anyone had experience in doing this?
Yanmar Oil Leak
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Yes, and you're right!
Get yourself a shop manual first and have the new gasket on hand along with the sealant. Yanmar goop is $25 for the small tube and that was four years ago. It looks to be just another silicone. Strongly consider a generic off the shelf brand. Have a new gasket scraper too, Also order up the seals for the cam shaft hand-crank and the crankshaft. The PTO bearing is probably fine. Mine was worked heavily and was still good at rebuild time. (Replaced anyway) The fuel injector pump will have to come off too. That means you'll want the gasket for it's rear cover. That cover has to come off so that you can re-install the fuel pump. Whew! How about just tightening the cover bolts first? Also, check the valve cover breather to the intake manifold. The orifice in the manifold that the breather hose is connected to, easily clogs and when that happens, leaks appear everywhere. It's a regular maintenance item done at every other oil change or so. You need a shop manual for most of this stuff, but especially the fuel pump re-installation. It's like the 'key to the vault', if that's the right metaphor, or pay the 'man'. And if you're not mechanical, don't even think about it. Good luck. P.S. And by 'mechanical', an appropriate definition for this work would be: Someone who sees an engine and drops the their knees and starts stroking it in anticipation of taking it APART! Wait a minute, sounds like a porn video script,,,, P.S.2 Don't forget your harmonic balancer puller for the crank pulley.
Get yourself a shop manual first and have the new gasket on hand along with the sealant. Yanmar goop is $25 for the small tube and that was four years ago. It looks to be just another silicone. Strongly consider a generic off the shelf brand. Have a new gasket scraper too, Also order up the seals for the cam shaft hand-crank and the crankshaft. The PTO bearing is probably fine. Mine was worked heavily and was still good at rebuild time. (Replaced anyway) The fuel injector pump will have to come off too. That means you'll want the gasket for it's rear cover. That cover has to come off so that you can re-install the fuel pump. Whew! How about just tightening the cover bolts first? Also, check the valve cover breather to the intake manifold. The orifice in the manifold that the breather hose is connected to, easily clogs and when that happens, leaks appear everywhere. It's a regular maintenance item done at every other oil change or so. You need a shop manual for most of this stuff, but especially the fuel pump re-installation. It's like the 'key to the vault', if that's the right metaphor, or pay the 'man'. And if you're not mechanical, don't even think about it. Good luck. P.S. And by 'mechanical', an appropriate definition for this work would be: Someone who sees an engine and drops the their knees and starts stroking it in anticipation of taking it APART! Wait a minute, sounds like a porn video script,,,, P.S.2 Don't forget your harmonic balancer puller for the crank pulley.
Where's this in the shop manual?
Fred, I've had a couple of 3GM30F's and not run into this problem. quote "Also, check the valve cover breather to the intake manifold. The orifice in the manifold that the breather hose is connected to, easily clogs and when that happens, leaks appear everywhere." I've got a couple of thousand hours on the present one and so far no oil leaks. Had a coolant leak but that's another story. Got the shop manual. I've never even thought of this breather hose thing. What exactly do you do?
Fred, I've had a couple of 3GM30F's and not run into this problem. quote "Also, check the valve cover breather to the intake manifold. The orifice in the manifold that the breather hose is connected to, easily clogs and when that happens, leaks appear everywhere." I've got a couple of thousand hours on the present one and so far no oil leaks. Had a coolant leak but that's another story. Got the shop manual. I've never even thought of this breather hose thing. What exactly do you do?
Rick,
It's in mine. And the orifice in my '86 3GM30F has plugged up in the past. When it does so, oil starts to weep at the valve cover bolt gaskets and the breather gasket also located on the valve cover. The orifice on mine is only about .020in. When it plugs, the blow-by from the pistons takes over and pressurizes the crankcase. And wouldn't you know it, I took the shop manual out to the boat this week so I can't quot it. And I've never done anything to the engine to modify this system but have questioned its' design. Why have a restricted passage to a diesels' intake? The vacuum allowed to the crankcase has no effect on diesel performance. Did Yanmar think they were building a gas engine? If later designs don't have this restrictions, the fitting is going to get drilled out. What do you think?
It's in mine. And the orifice in my '86 3GM30F has plugged up in the past. When it does so, oil starts to weep at the valve cover bolt gaskets and the breather gasket also located on the valve cover. The orifice on mine is only about .020in. When it plugs, the blow-by from the pistons takes over and pressurizes the crankcase. And wouldn't you know it, I took the shop manual out to the boat this week so I can't quot it. And I've never done anything to the engine to modify this system but have questioned its' design. Why have a restricted passage to a diesels' intake? The vacuum allowed to the crankcase has no effect on diesel performance. Did Yanmar think they were building a gas engine? If later designs don't have this restrictions, the fitting is going to get drilled out. What do you think?
Mine were much later engines
Fred, Mine was a 96 and a 2002 so maybe they got smart and fixed this. I think my manual is an 83 one. Yanmar doesn't date them but the code is xxxxx-830215. I'm curious about this problem because I can't find anything on this in the manual, not even about inspecting the breather. I'm looking at the intake side view and can't find it.
Fred, Mine was a 96 and a 2002 so maybe they got smart and fixed this. I think my manual is an 83 one. Yanmar doesn't date them but the code is xxxxx-830215. I'm curious about this problem because I can't find anything on this in the manual, not even about inspecting the breather. I'm looking at the intake side view and can't find it.
Had mine done last year
but the first guy who gave it a shot ended up braking my fuel pump and left it in a run away state.. End up having Mack Boring fix both the timing gasket and re-build the fuel pump.. Total cost was 1500.00 dollars. Motor is 3GMF22
but the first guy who gave it a shot ended up braking my fuel pump and left it in a run away state.. End up having Mack Boring fix both the timing gasket and re-build the fuel pump.. Total cost was 1500.00 dollars. Motor is 3GMF22
Rick, couldn't get to it yesterday,
I was practicing the fine art of trying to sink my boat. Don't ask! She's OK. Carl, the rear cover has to come off to put the pump back on. It's the only way to re-engage the metering rack with the throttle lever. If the first worker didn't know what he was doing and just started the engine, it would run away. Scary. How did he shut it down? Also, that shouldn't break the pump. Too late now to discuss that though.
I was practicing the fine art of trying to sink my boat. Don't ask! She's OK. Carl, the rear cover has to come off to put the pump back on. It's the only way to re-engage the metering rack with the throttle lever. If the first worker didn't know what he was doing and just started the engine, it would run away. Scary. How did he shut it down? Also, that shouldn't break the pump. Too late now to discuss that though.
Rick,
you mentioned your engine had a coolant leak, where? Did you solve the problem? My 1995 Yanmar 3GM30F engine has one at the head gasket, I have replaced the gasket twice but it still leaks at 2900 rpm. The leak stops below 2900 rpm. Ozana
you mentioned your engine had a coolant leak, where? Did you solve the problem? My 1995 Yanmar 3GM30F engine has one at the head gasket, I have replaced the gasket twice but it still leaks at 2900 rpm. The leak stops below 2900 rpm. Ozana
mrkayak2 coolant leak
The coolant leak was found after a lot of searching and after tightening all the hoses etc. It was a small amount and visible in the engine pan. I finally traced it to the little plate at the back of the engine where they used to put internal zincs ( they don't bother anymore) Apparently the plate was put on without a gasket. A gasket solved the problem.
The coolant leak was found after a lot of searching and after tightening all the hoses etc. It was a small amount and visible in the engine pan. I finally traced it to the little plate at the back of the engine where they used to put internal zincs ( they don't bother anymore) Apparently the plate was put on without a gasket. A gasket solved the problem.
Hey Fred .. The guy was able to
shutdown the engine by blocking the air intact which starved the engine of air.. Some how he had bent the metering rack.?? Anyway when starting the engine now the throdder need to be at 3/4 for it to start on the first try. I think this is normal as the motor fires right up.
shutdown the engine by blocking the air intact which starved the engine of air.. Some how he had bent the metering rack.?? Anyway when starting the engine now the throdder need to be at 3/4 for it to start on the first try. I think this is normal as the motor fires right up.
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