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George Darrell
New member
Username: George_darrell

Post Number: 4
Registered: 05-2002

Rating: N/A
Votes: 0

Posted on Sunday, August 11, 2002 - 10:18 am:   

This is a follow up to my earlier queries regarding what I thought was prop "clatter". I received several useful suggestions and discovered that the problem was the clutch.

The clutch was, to use an automotive expression, chattering for several minutes before it would seat and resume normal operation. I have access to a machine shop with pullers, presses and metric wrenches so decided to pull the transmission/clutch and see what was going on. I also have a Yanmar shop manual which is a must.

After inspecting the disassembled clutch cone, gears, shafts, bearings etc. everything seemed to be OK. In mikeing the fit of the clutch into foreward gear I noticed that there was excessive variation in depth as I worked around the fit. It was marginally within spec but very suspicious! I decided to reverse the foreward and reverse gears and clutch since they are identical and the problem disappeared. It has been running great ever since!

As an aside, a new 12 pitch prop has boosted speed about 10% but Loren Thompson has bettered me with a 14 pitch prop for even greater speed. These Yanmar engines like to work but the clutch may eventually show some strain.

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