Join Date: Jul 2008
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Rep Power: 8
On my Yanmar 2QM15 engine, you have to pull the entire water pump assembly off to get to the cover of the impeller. This also means loosening the drive belt. When I had the engine survey done, the seasoned mechanic told me to buy an extra water pump assembly and a few rebuild kits. His thinking was that it was easier and quicker to just replace the entire pump assembly if the impeller failed, especially if you were underway, needed the engine, and were not in calm sea conditions. He told me to try and imagine having to rebuild the pump in 10 to 15 foot seas when the engine might be needed, and boat handling might require you to be available elsewhere. He said that to pull the broken pump assembly and install the new one could be done in under 10 minutes, but sitting at the table, rebuilding one, would take much longer, especially in rough weather and under stress, especially if the engine was really needed at that time. He suggested rebuilding the broken one later, when time, sea conditions, etc. were more favorable. Something worth considering, since you can't always predict when the impeller will go bad, and chances are it is when you really want to have the engine working.
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1980 Pacific Seacraft Orion 27
Sailing Grounds: Southern California