Yanmar 3YM20 sea water pump leak...repair or replace? - SailNet Community
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post #1 of 5 Old 09-30-2013 Thread Starter
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Yanmar 3YM20 sea water pump leak...repair or replace?

Got a leaking sea water pump on my yanmar 3YM20. The leak is from the rear f the pump behind the impeller. I have read you can repair them. Is it an easy job? The replacement pump is about $270 from my local yanmar dealer. I know the rebuild is cheaper but how long will it last and will it be less hassle to replace the whole unit?

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post #2 of 5 Old 09-30-2013
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Re: Yanmar 3YM20 sea water pump leak...repair or replace?

depends on the problem if it is just a seal then it is cheap but if the shaft is worn then a new seal will help but might not fix it for long. the shaft is about $100 and can be removed by removing the pulley and tapping out the shaft with a soft hammer. it does take a little mechanical know how. buying a new one is a easier and if yours requires more then a seal may be the better way to go

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post #3 of 5 Old 09-30-2013
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Re: Yanmar 3YM20 sea water pump leak...repair or replace?

Buy a new one to replace the current one and then rebuild the old one in case of emergencies
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Re: Yanmar 3YM20 sea water pump leak...repair or replace?

Thx. I think I will buy a new one and keep the old as a spare.

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post #5 of 5 Old 09-30-2013
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Re: Yanmar 3YM20 sea water pump leak...repair or replace?

What i did was buy a new shaft and the bearings, oil seal, spacer, c-clips, o-rings and disk, LH nut. Re Built both shafts (new and old). Fit new into pump and keep old rebuild as spares. Only bought shaft, LH nut, disk and spacer from Yanmar dealer. Oil seals, o-ring and bearings from auto supply shop. Use waterproof grease when rebuilding pump.

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