Originally Posted by boatpoker
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?