Yanmar 2GM20F Oil pan leaks - SailNet Community
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post #1 of 22 Old 03-04-2013 Thread Starter
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Yanmar 2GM20F Oil pan leaks

I notice oil drips from under my 2GM20F even when engine hasn't run for a week or two. On closer inspection (with a small mirror) I see oil forming at the oil pan gasket right under the engine. There was no oil drips/oil stain from higher up the engine body. Question is can I remove the oil pan and change the gasket as is without hoisting the engine out? I think I can access all the 16 or 17 bolts (10mm AF ?) underneath.
Meantime, I've retighten all the oil pan bolts (some weren't very tight) and will check it again coming weekend to see if it is still leaking.
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post #2 of 22 Old 03-04-2013
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Re: Yanmar 2GM20F Oil pan leaks

You know, I have a similiar problem with my Yanmar but I believe the Gasket between the Transmission and the Engine has a slight leak. My oil is very clean. Looks like pulling the engine is the only way to get to my problem.
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post #3 of 22 Old 03-05-2013 Thread Starter
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Re: Yanmar 2GM20F Oil pan leaks

Mine is black so pretty sure from crankcase. Seems like unbolting the oil pan is do-able if the bolt heads are not rounded and I should get a suitably long 10mmAF socket spanner.
Planning: warm up engine, extract as much oil, lay out plastic sheet under engine, stack oil absorbent on top of plastic then undo oil pan bolts. Let remaining oil drip. Clean up pan and box up with new gasket. Pat myself on the back and have a cold beer. Hope its as easy as it sounds. I'm not inviting Murphy to this party. Hope he don't gate crash.

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post #4 of 22 Old 05-14-2013
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Re: Yanmar 2GM20F Oil pan leaks

How did it go?
I have the same issue.

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post #5 of 22 Old 05-14-2013
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Don't taunt Murphy!

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How did it go?
I have the same issue.
Yeah...I'd like to know myself.
That sounds like a party thrown by Murphy's family! Especially when you taunt him with the vision of you relaxing with a cold beer!
Only his vision has all your knuckles bleeding, your bilge full of oil, having pulled the motor to remove broken bolts and get the pan back on, and you curled up in the V berth, nursing from a bottle of Jack Daniels, muttering, "Ya know....I could have lived with that damn leak"!
Oh...And six months later, you discover you have the same leak with the new gasket!
Hope I'm wrong! How did it go?

Last edited by L124C; 05-15-2013 at 03:41 AM.
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post #6 of 22 Old 05-15-2013 Thread Starter
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Re: Yanmar 2GM20F Oil pan leaks

Well upon further investigation, I found the leak to be from the engine front cover. Leak somewhere near or between the 2 lower bolts. Oil drips down from there and along the oil pan. For now, the plan is to leave it and see how far the level will drop to. If its settles above the minimum level then fine. No need repair. So far level is 2/3. Fingers cross.
PS: I bought the pan gasket but looks like not needed.

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post #7 of 22 Old 05-16-2013
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Re: Yanmar 2GM20F Oil pan leaks

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Originally Posted by trantor12020 View Post
Well upon further investigation, I found the leak to be from the engine front cover. Leak somewhere near or between the 2 lower bolts. Oil drips down from there and along the oil pan. For now, the plan is to leave it and see how far the level will drop to. If its settles above the minimum level then fine. No need repair. So far level is 2/3. Fingers cross.
PS: I bought the pan gasket but looks like not needed.
If the area under the motor is dry (except for oil of course!) disposable baby diapers work great for absorption. My 30 year old 2GM20 leaks a little, but not enough to effect oil levels. Certainly not enough to deal with Murphy! One diaper easily lasts me a year. Now, if you are going through a diaper a week......

Last edited by L124C; 05-16-2013 at 01:47 PM.
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post #8 of 22 Old 05-18-2013
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Re: Yanmar 2GM20F Oil pan leaks

Ken - If the leak is between the front area and the main motor it is a known Yanmar 2GM20F problem and "should" be covered by warrantee - mine wasn't - they stonewalled me and I ended up paying for the work myself - and I paid top dollar because of the marina where I was stuck.

From the sound of it you have a break in your timing gasket.

You need:
one timing gasket (part 1215701512) was $17.79 in 2006
one gasket (part 1215701861) was $1.70 in 2006
two "O" rings (part 24311000100) were $1.38 each in 2006

That's all.

More info:

"Yanmar have produced a new steel reinforced gasket to combat the problem p/n 121575- 01512. Other parts required are side cover (inspection plate) gasket p/n 121575-01861 oil way o-rings x2 p/n 24311-000100"

and more:

"This is the Yanmar technical bulletin that deals with a timing cover issue. The bulletin # MSB-02-003 must accompany any warranty claim that is submitted. "

It is a simple job to replace the gasket and two "O" rings. No need to drain the oil nor the water.

The new "metal" type gasket that replaces the old "paper" gasket.

PM me if I can give you more details. I have pictures.

Rik

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Last edited by rikhall; 05-18-2013 at 10:16 PM.
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post #9 of 22 Old 05-19-2013 Thread Starter
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Re: Yanmar 2GM20F Oil pan leaks

Rikhall, my engine no longer has warranty. Was no leak for about 10 years. Just pass 10 years. Appreciate pictures. Will PM you my email. From how I see it, it wasn't an easy fix. Not sure if its the same timing cover you refers to. Hope so.

Ken

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post #10 of 22 Old 05-19-2013
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Re: Yanmar 2GM20F Oil pan leaks

Ken

Pictures at https://picasaweb.google.com/RikHall...NH3m5iI4PvD8gE

I hope it is the same as what I had. Easy fix.

Rik

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