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Old 04-07-2014, 09:45   #1
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Yanmar KM4A transmission cooler - needed in northern waters?

Hi all,

I'm new to the forum. I have a 1997 Beneteau 383 (Moorings version of Oceanis 381). The boat used to be in charter in the BVI, but it has been living in quiet retirement for a few years on Lake Ontario. Late last year, the transmission (Yanmar KM4A) started having trouble finding the forward gear. A mechanic friend checked and found water in the transmission oil. I changed the oil, which fixed the problem (fortunately), but it appears that the transmission oil cooler is corroded. My friend bypassed the cooler (looped a hose from water output to intake on the engine) for the time being, so I can still use the boat for day sails without getting water in the transmission. He is ordering a new transmission oil cooler, and will be replacing it when it comes.

My question is this: do the experts in the group think that the transmission oil cooler is necessary when using the boat in water that rarely gets above 23 degrees C / 73 degrees F? The boat was originally built for the tropics, where both the air and water temperatures were somewhat higher. I'm not so concerned about short runs, but if I have to motor for 6-12 hours, should I be concerned? (I plan to replace the cooler in any case, but am interested in hearing whether people think it's money well spent!)

Thanks in advance.

Chris Moore
Hamilton ON Canada
chrismoore58 is offline   Reply With Quote

transmission, water, yanmar

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