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Old 28-11-2012, 06:02   #1
Marine Service Provider

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2GM20FC Rear Oil Seal

Hi all,

Looking for some opinions/thoughts.

The rear oil seal on one of our engines is leaking.

The issue is I just changed it out about 1 year ago, ~100hrs, which is pretty low hours for it to fail again. I realize it wont last as good as the first time due to wear on the shaft, but this seems premature to say the least.

The groove on the shaft was a bit deep when I replaced last year, but not scary deep.

So, what to do now?

Can I put a spacer behind the seal to move the seal a bit? Is there room on this engine to do this?

Is there a thicker seal I can use that would provide a bigger surface area of seal?

I am hauling out in 2 weeks, and have to be hauled to pull the saildrive, to access the seal, so any thoughts would be great.
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Old 29-11-2012, 07:01   #2
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Re: 2GM20FC Rear Oil Seal

Hi Mark,

I don't think there are shims or spacers behind the rear oil seal, but I am not very familiar with the Yanmar. I'm surprised that the oil seal caused a groove on the crankshaft - there usually isn't much pressure on that seal.

If your shaft is grooved, you could install a speedi-sleeve on it: Speedi-Sleeve shaft repair kits

Don't know the availability in Panama, though.

Mark
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Old 29-11-2012, 13:24   #3
Marine Service Provider

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Re: 2GM20FC Rear Oil Seal

Hey Mark,

I do not think there are any shims currently, but was wondering if anyone had been able to add one to move the mating surface a bit.

Yes, a bit of a groove unfortunately. I guess the original was real tight!

I know about speedi seals, but unlikely to find here in Panama. At least without lots of searching.

Maybe the seal I put on last year was bad, and a new seal will do the trick. I can only hope..... Just a PITA to change again.
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