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post #25 of Old 07-16-2013
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Re: Yanmar Transmission Clutch Problem

Originally Posted by Rusty123 View Post
The referenced Yanmar tech bulletin says to leave the transmission in neutral during sailing, but that the shaft can be locked (with an add-on device) if the user doesn't like the prop rotation noise.

Question: what does prop rotation noise sound like? I get a faint squeal or whine (a little like a bad bearing) from my transmission when under sail in neutral. Is that sort of noise normal?
Often times a free-spinning prop will sound a bit like a low humming noise. There may be a bit of a squeal (if your listening to the transmission more directly, such as via an open lazarette), kind of like a car gearing down. If in doubt, take a look at the shaft to see if it's turning.

Never forget them. Do something to prevent it from happening again.
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