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post #9 of Old 07-03-2009
Maine Sail
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Originally Posted by L124C View Post
I got the parts from the local Yanmar dealer. Strange thing is, the parts diagram (see picture) calls for 2 bearings (#7) and 1 oil seal (#8). No water seal. The motor is a 2GM20(F). I questioned the lady at Yanmar about it and she showed me the diagram (which she had nicely copied for me) and correctly said "your looking at the same thing I am". This makes me wonder, what keeps the water in the pump, and if I don't have a water seal, whats leaking? I could pull it apart, but have a race coming up and don't want to unable to get a part. Ideas?
Your pump is belt driven not engine driven therefore you only need one seal. That seal is for raw salt water or lake water. On some engines the pump bolts directly to the engine block where it is splash lubed by oil and driven directly off the engine so you'd have two seals one for water and one for the oil side.. Yours is driven by a belt thus one seal...

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