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Compass Marine How To | all galleries >> Welcome To >> Rebuilding A Raw Water Pump > Pump Removed
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Pump Removed

This article is going to assume you have the skills to safely and easily remove your own water pump from the engine. This one is easy and uses four bolts and a gasket to mount to the timing gear case on the engine.

In this photo you can see how the pump came off the motor. While not leaking badly the oil seal side was weeping a tiny bit of oil as shown. Also when they installed this motor they used 1" hose on a 7/8" hose barb so there was some water leakage that cause some of the corrosion. This pump appears to have never been rebuilt and the motor has 2878 hours on her so good pumps can last a long time.

This raw water pump is made by Johnson Pump as a specific OEM unit for Westerbeke. Unfortunately Johnson Pump will not sell you parts, other than an impeller, due to OEM agreements.

A new Westerbeke pump is $480.00 and the rebuild kit is $130.00. This kit includes literally everything but the pump body!! Rebuilding is the cost effective and obvious choice provided your pump body is in good condition.

Nikon D40
1/60s f/13.0 at 24.0mm iso200 full exif

other sizes: small medium large auto
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John Callaghan15-May-2017 07:53
Nice post. Have you get this repaired from some company or just replaced it with a new pump? It is looking like the pump has been used from many years, however, after painting, it would look like a new one. The only condition is that it should work in a fine manner.
Billy 13-May-2015 23:36
Per your instructions I just removed the seals from what I believe is a factory pump that came with the generator. The spacer was in backwards in contrast to your instuctions. Searching I found a Westerbeke bulletin which had a parts diagram saying and showing the spacer with feet against the oil seal just as you instruct.
Thank you so much for this well made how to guide. Without it I would never have attempted this rebuild.
Fortunat 13-May-2014 01:28
Is it possible/advisable to replace on the water side seal if that is all that is leaking?

How urgent is it if I just have a small drip, can I wait til the end of the season so I don't have to waste precious maine sailing days to do the rebuild or will I do more damage in the meantime?
cambriarhay21-Apr-2014 15:28
I do not think that I have the skills to safely remove the water pump from the engine. I thought that replacing it would be a quick DIY fix but the more I read, the less confident I'm becoming. I guess I should just call a professional and not try to play handyman.
rrouse16-Jul-2012 16:10
Does anyone know of someone that will rebuild these pumps?
LOUBOUTINPUMPS 11-Jun-2011 04:06
Guest 01-Jul-2009 12:49
What a fantastic post. This is as good as it gets.