yanmar 3ym20 raw water pump - SailNet Community

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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Engines > Diesel
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Old 11-01-2011
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yanmar 3ym20 raw water pump

Hi everyone. I have discovered a leak in the raw water pump of my yanmar 3ym20 pump. Seems to be the oil seal. Any advise on how to change it. What do I have to dismount if the pump needs removing.
Any advice welcome!!
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Old 11-01-2011
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Since you have to take the pump apart, you might as well do a rebuild. The link below shows the process for a different pump, but it will be similar for yours.

Rebuilding A Raw Water Pump Photo Gallery by Compass Marine at pbase.com

It's not a trivial job, but if you compare the price of a rebuild kit to that for a new pump, you'll see its worth it.
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Old 11-02-2011
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Give me your email, I'll send you the pump service instruction I wrote.
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Old 11-02-2011
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I bought a kit and rebuilt the raw water pump om my Yanmar 2GM a few years ago. Not a big job but there was one or two cir clips on the middle of the shaft that held the impeller/shaft in place that was not obvious and took a little head scratching until I saw it.
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