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post #9 of Old 01-04-2010
JohnRPollard's Avatar
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Originally Posted by boatpoker View Post
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.

Hi, thanks for that good info.

Do you know whether Yanmar corrected the heat exchanger problem on all new sales/installations of 3YMs going forward, or are they only addressing it if a problem develops? In other words, do they still sell the new engine with this smaller exchanger/impeller combo?

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