Join Date: Jul 2008
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A number of 3YM30's have had overheating problems due to undersized heat exchangers and a smaller raw water pump. Yanmar is aware of the issue and have replaced a number of exchangers free of charge. These issues have been showing up around the 150 hour mark on engines with serial numbers lower than 6000
The fix is to install a 66 tube heat exchanger rather than the original 35 tube unit an use a larger raw water pump.
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Last edited by boatpoker; 01-01-2010 at 06:53 PM.