Yanmar 2GM intermittent low power - Page 3 - SailNet Community
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post #21 of 22 Old 07-31-2007
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Had a similar problem

Our boat has a 2GM as well. A few years ago, we started to hear a vibration in the rear end of the engine - but it was intermittent. A cable adjustment seemed to clear up the problem.

This spring, there was more vibration, esp at high RPMs. Sometimes it would go away after about 30 minutes of slowly working from idle to 2800rpm. But after 3 weekends of sailing, we found that this solution was becoming less effective, until finally we couldn't comfortably run the engine at more than idle speed. That meant a 3 hour sail home took 10 hours motoring since of course these things always happen in calm weather!

Our first thought was damper plate, so we had the engine pulled. The plate was fine, so we we had the transmission inspected -- a bent shaft was discovered.

A complete rebuild is required -- we've been waiting on parts that are backordered 1-2 weeks (3.5 weeks ago).... Hopefully we'll be back to sailing soon -- as in our Canadian climes, losing June and July to mechanical problems means 75% of the warm sailing season is gone :-(
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post #22 of 22 Old 07-31-2007
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black smoke on a diesel means over-fuel condition (malfunctioning injectors)
Gray/blue smoke means engine oil being burned (piston rings, head gasket-sometimes)
Whitesmoke means WATER being burned (head gasket, cracked head, cracked block, cylinder liner seal)
do a pressure leak down test on the cooling system

We are not primarily on earth to see through one another, but to see one another through

Some people are like slinkies: not really good for anything... but you can't help laughing when you push them down the stairs
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