Yanmar 2GM20F Oil pan leaks - Page 2 - SailNet Community
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post #11 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

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Ken

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

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

Rik
Hi Rik,

Sorry to be bringing an old thread back to life but I searched the web this morning after noticing a small oil leak on our engine this weekend. I've identified the leak to be arround the same faulty gasket listed in this thread and saw your pictures that match my engine as well.

I was wondering, when you mention that is was an easy fix, how "easy" would you qualify it for someone who isn't that much of a mechanical? I manage to replace alternator straps and water pump's impeller but I thought it looked like a huge job when I comtemplated the idea of starting to take everything off that is screwed to this part of the engine!

Any special tools required beside the good 'ol rachet (pullers or special ratchets to measure pressure applied to bolts?).

Thanks in advance for your input!
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post #12 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

All of us Murphs have a special vulnerability to the law BUT I did manage a complete ring job on my 3GM30F with the engine in place. Your pan may well drop down in place which makes a new gasket a fairly easy job. Just drape a cloth to catch the inevitable dropped bolt, lay a mirror in there along with a good bright lamp, and go easy with the 10mm wrench. Pan bolts usually come out without a fight because they rarely get rusted in place and are not torqued very much. For any rounded off heads on marine engines I've found it pays to keep both U.S. sized wrenches and metric for those in-between sized rusted bolts. Also make sure you have 6 point sockets, not 12. Put it back together with good gasket cement. Gasket cements have come a long way and can be used with or without a paper gasket.

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Last edited by smurphny; 07-14-2014 at 02:00 PM.
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post #13 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

Yeah, the pan wouldn't have scared me too much, but it's the timing gear case that needs to come off... (see page at right here : Boatinfo - Yanmar Service Manual for 1GM10, 2GM20, 3GM30, 3HM35)

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All of us Murphs have a special vulnerability to the law BUT I did manage a complete ring job on my 3GM30F with the engine in place. Your pan may well drop down in place which makes a new gasket a fairly easy job. Just drape a cloth to catch the inevitable dropped bolt, lay a mirror in there along with a good bright lamp, and go easy with the 10mm wrench. Pan bolts usually come out without a fight because they rarely get rusted in place and are not torqued very much. For any rounded off heads on marine engines I've found it pays to keep both U.S. sized wrenches and metric for those in-between sized rusted bolts. Also make sure you have 6 point sockets, not 12. Put it back together with good gasket cement. Gasket cements have come a long way and can be used with or without a paper gasket.
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post #14 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

Are you sure the timing gear case needs to be removed? It's been a while since I did my 3GM but think I remember that the pan is independent of anything else.

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post #15 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

Yes, the oil pan is independant.

But the gasket that appears to be leaking is the one of the timing gear case.

I wish it would have been only the pan...
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post #16 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

Get yourself the 2/3GM "engine repair and maintenance" manual. Most larger Yanmar distributors have them.

The timing cover is easily removed, once you get the crankshaft sheave off - just a big nut ... and a shaft-key thats easily lost or dropped into a deep bilge.
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post #17 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

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The timing cover is easily removed, once you get the crankshaft sheave off - just a big nut ... and a shaft-key thats easily lost or dropped into a deep bilge.
Yes, I understand. But for neophytes like me, it is still something that doesn't seem so accessible.

It will be between a nice contract to a marine mechanic or a DIY big leap for me...
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post #18 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

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Yes, the oil pan is independant.

But the gasket that appears to be leaking is the one of the timing gear case.

I wish it would have been only the pan...
Oh, sorry. I thought it was the pan. The gear case cover is actually easier because you can see it without mirrors and gymnastics:-). +1 on getting the real Yanmar maintenance manual. They're not cheap but absolutely necessary to keep aboard.

Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.
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post #19 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

Yeah, I know it's pretty accessible but it's all the experience with torque ratchets and engine repair that I don't have that scares me a little. I am enticed to give it a try but as you said it yourself, Murphs are always candidates for the inevitable
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post #20 of 22 Old 07-14-2014
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Re: Yanmar 2GM20F Oil pan leaks

Just my opinion but knowing how to fix your engine and having aboard all the spare parts and tools you may need is an essential part of sailing. There is no rocket science involved. There is also a great deal of confidence to be gained in becoming independent. In owning boats there are many times when things break and the only one to fix it is you. It's part of the game.

Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.
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