Why is Yanmer Oil Seal Better?

Yes, that's the idea, but reality turned out to be not as simple.

The damper plate bolts were solidly rusted on, so I had to buy a flywheel locker just to be able to apply sufficient torque on them. Then the damper plate itself, a seriously rusted piece of metal wouldn't come off. 'Luckily' two of the springs in the plate were loose and rattling, so I decided that the damper plate is done for anyway. Even after deciding on destructive removal it took more than an hour of strategically banging on the thing to break it off the flywheel.

Of course the flywheel seems to be similarly rusted on and refuses to budge after undoing the bolts. The manual suggests screwing on the damper plate bolts and pulling it from there -- I haven't tried this yet. If it doesn't work I'll have to make some sort of puller for it based on the same idea. So I'm almost there. Many suggest removing the bearing holder and pushing the seal out this way. I'll try this first, as an opportunity to replace the O ring that's there just in case that's leaking oil too. If I can't get the bearing holder off, which seems the most probable scenario, I'll just pry the seal out and hope the O rings are not responsible for the leak.

I have no idea why my engine is so rusted inside, I bought the boat last year and don't really know its history.

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Since the salesman concludes it is not a real problem - you are entitled to ask him to please explain exactly what is causing this oil leak and so why it is "not a problem".

Once he explains the "very simple" reasons underpinning this leak - I am sure he and the owner will agree to fix the problem (at no cost) - because the fix is so very trivial.

Particularly - is this excessive crankcase pressure? If so, then what is the causing this pressure? Or is this simply failed cover gasket? If that is so, then why didn't the owner fix this simple problem to start with? Who told these folks what the trivial problem is and are they willing to let you talk to the guy who diagnosed the problem?

Post these explanations you get here if you feel further comment from people like Kloudie and the rest of us might be useful to you

Charles

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