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Old 04-22-2010
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Replace fresh water pump?

I've got a Yanmar 4JH2E (1994) with about 2,800 hours on it. It looks like the fresh water pump has never been replaced. I was replacing hoses today and noticed that there is a fair amount of corrosion and pitting on the metal at the hose connections. Should I replace the pump as a preventative measure? I'm asking because it looks like they cost about $270. Does anyone know how long these pumps typically last?
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If there is a lot of corrosion on the outside of the housing, it usually signifies that connection was leaking. It is up to you to judge how corroded it is and whether it actually represents a problem or not. If a hose connection snaps off, you won't be able to use the engine until the pump is replaced so keep that in mind.

Usually what happens to water pumps is that the seals start to go in them which can be diagnosed by water coming out of the weep hole. It would be hard to give the pumps a life span since some environments have much worse corrosion.
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Old 04-22-2010
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Given the age of the pump, corrosion on it and pitting, replacing it might be wise and prudent.
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