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  #1  
Old 12-31-2012
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Raw water pump help needed

I have just had my third raw water pump in four years die. Obviously I use me boat a lot but in the first 35 years of sailing never had to touch one. It is a Westerbeke 58, is there a trick I am missing eg lubrication or belt tension?

BTW, currently anchored in Plettenberg Bay and will sail to Mossel Bay overnight, if the predicted wind happens. It is only 60 miles but winds are light for the next two days before a 40 knot buster comes. If I can get the water pump replaced there should be a good window for going around Cape Agulhas.
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Old 12-31-2012
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Re: Raw water pump help needed

What part of the pump is failing? Seals? Bearings? Are you buying cheap rebuilts or new units?
Does the boat have the original alternator? Is there an alignment issue with the belt because of an upgraded alternator?
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Old 01-02-2013
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Re: Raw water pump help needed

The failures are of the seals along the shaft. When I bought the boat there were two spare pumps onboard which makes me think that this might be an ongoing problem. Could no tell if the ones I installed were rebuilds or not. When I did the last install I was very careful with alignment because I thought that this might be a problem. BTW, the alternator does not run off the same belts as the raw water pump. How tight should the belt be for the raw water pump?
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Back to Grenada in early December. Not sure I will remember how to sail. Will spend the winter and early spring in the Caribbean and then head to Bermuda and the northeast US. Still trying to decide if we will bring the boat to Canada, either in 2015 or 2016.
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Old 01-02-2013
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Re: Raw water pump help needed

The belt should be precisely as tight as the manual says it should be.
http://www.westerbeke.com/OnlineManu...100_033507.pdf

That's 10 to 12mm of deflection when pressed at the center of the long side.
That's a tad less than a half inch for us American metric morons.
That's with 'normal' strength fingers - no gorilla standing on the belt.
Basically that's the same as every engine I've ever owned.
Too much tension can and does cause excess wear exactly as you've been seeing.
Too little tension can cause engine overheats.

If you aren't overheating or seeing signs of slippage loosen the belt, because you are seeing signs it's too tight.
jrd22 and Minnewaska like this.
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Old 01-03-2013
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Re: Raw water pump help needed

That is about the tension I had on it. Hard to be sure since the distance between components is not nearly as large as with the double belts that service the alternator. I guess I just have to be very careful with the reinstall. At least I will know it is a new pump. I am going too rebuild the old one so I have a spare onboard (again).
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Back to Grenada in early December. Not sure I will remember how to sail. Will spend the winter and early spring in the Caribbean and then head to Bermuda and the northeast US. Still trying to decide if we will bring the boat to Canada, either in 2015 or 2016.
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Old 01-03-2013
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Re: Raw water pump help needed

make sure to check the quality of the pump you are buying i think the quality is just bad which all pumps you are buying... i want to know that whether you have bought all these from same vendor or not........
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Old 01-03-2013
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Re: Raw water pump help needed

Quote:
Originally Posted by killarney_sailor View Post
....I am going too rebuild the old one so I have a spare onboard (again).
Rebuilding the old one is only good as an emergency spare, IMO. Malformed and poorly fitting seats are exactly why. They'll work fine for the time it takes to order and receive another new one. They are ridiculously expensive for a primitive pump, but new is the way to go.

Were your spares in their orginal OEM packaging? It doesn't prove anything, but its a clue.

My first thought, before you mentioned the possibility of using rebuilts, was also belt tension. If you somehow convince yourself the units were new, I would lighten it up a bit. You may need a new belt though.
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Old 01-03-2013
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Re: Raw water pump help needed

Pumps are from Sherwood and were not in their packaging, but I tend not to keep packaging in any case since it does not stand up for months/years on a boat in constant use. Perhaps I am over-analyzing and will just do my best and not worry.
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Old 01-03-2013
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Re: Raw water pump help needed

Many pumps have ferrous metal in the seals.I have had the same problem.keep plenty of spares.marc
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Old 01-03-2013
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Re: Raw water pump help needed

Quote:
Originally Posted by killarney_sailor View Post
I have just had my third raw water pump in four years die. Obviously I use me boat a lot but in the first 35 years of sailing never had to touch one. It is a Westerbeke 58, is there a trick I am missing eg lubrication or belt tension?

BTW, currently anchored in Plettenberg Bay and will sail to Mossel Bay overnight, if the predicted wind happens. It is only 60 miles but winds are light for the next two days before a 40 knot buster comes. If I can get the water pump replaced there should be a good window for going around Cape Agulhas.
Need more info...



What pump? - model #24102? If it is a 24102 it is a Sherwood and the Sherwood may be available for less money.

What is failing? Seals, bearings/bushings, shaft, impeller?

Have you measured flow?

What should the flow curve be at given RPM?

Are you hitting the "flow" Westerbeke says you should?

Does this share a belt with an alternator? IIRC it does not....

How tight is the belt? It should be just tight enough to not slip but nowhere as tight as the alt belt needs to be. In a short belt for a RWP 1/2" to 5/8" deflection when pressed in the center is usually sufficient. With an alt and a longer span you'd want to be closer 1/2" max...

Is the RWP above resting waterline?
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Last edited by Maine Sail; 01-03-2013 at 09:11 AM.
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