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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 08-09-2013
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YANMAR TRIPLE clunk

Hey guys, I have a friend with a yanmar triple cylinder which was running fine out of the harbour, but after the sail she wouldn't turn over, it will turn when the pressure cocks are off, but when closed just seems to clunk and will not rotate. batteries are fine and it is in neutral ( at least the cable moves the lever to the right position. Could the drive still be engaged ? Any suggestions would be great.

Mike.
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Old 08-09-2013
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Re: YANMAR TRIPLE clunk

Quote:
Originally Posted by GaiaOrion View Post
...it will turn when the pressure cocks are off, but when closed just seems to clunk and will not rotate. batteries are fine...
Mike.
By "pressure cocks" I assume you mean compression release and when the compression is released the engine turns? If so...I would suspect the starter or starter cabling...if the batteries really are "fine."

If the engine turns when compression is released which lowers the load on the starting motor but is reluctant to turn when compression builds up the first thing I would check would be the starting circuit.

I had a similar problem on a small Yanmar and it turned out to be a broken permanent magnet segment on the stator of the starter motor AND a bad cable from the battery to the starter which was dropping so much voltage only 5-6 volts were present at the starter terminal post.

Good luck.
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Old 08-11-2013
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Re: YANMAR TRIPLE clunk

Sure sounds like starter, batteries or cables. I would start with the easy things. Clean the connections to the batteries, check the charge in the batteries, and check the voltage at the starter when cranking. Then move on to the more difficult and expensive ones like changing the starter.
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Old 08-11-2013
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Re: YANMAR TRIPLE clunk

My 30GMF will actually start in gear. I would start where Frye and Jim mentioned. Sounds like a starter issue.
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