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Old 02-12-2008, 19:32   #16
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Amen! When in doubt, check the heat exchanger - that's were the big pieces, such as impeller bits, wind up.
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Old 15-05-2011, 19:10   #17
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Re: How much is a raw water pump affected by a scored cover plate?

Quote:
Originally Posted by Northeaster View Post
I have a 1982 Yanmar 2GM (raw water cooled).
The water pump works well enough to keep it running cool, for hours at a time.
However, I do have to close the raw water seacock, while sailing, or else (I assume) the suction of water past the boat's hull causes a pull on the water inside the thru-hull / hoses (maybe there is a small airleak that lets the water be pulled out more easily than normal????
In any case, as long as I close the thru-hull while sailing it's fine. If I forget to do that, I have to close it briefly with the engine running (to create more suction), or pull of a water hose, to get the water restarted.

The impeller has been changed, and both old/ new where in perfect shape.
I noticed a fair bit of scoring on the cover, and am thinking of replacing the cover with a speedseal cover, to see if it then pumps stronger, and may overcome the other issues.


If I could get a reasonably priced replacement pump, I would consider that as well, and keep the old one for a spare.

Thoughts??
Hi Northeaster
Did you ever solve the problem of sucking air into your cooling system ?
I have a 3HMF and have the same problem - and have to disconnect hose to reestablish flow every time. Even installed a vented loop at the elbow section but to no avail. Appreciate your response. Thanks.
Wimpel
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Old 18-05-2011, 16:43   #18
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Re: How Much Is a Raw Water Pump Affected by a Scored Cover Plate ?

It's been a while ,so I kinda forgot about what I did back then. It has worked great for the last couple of years, and I believe all that I did was to turn the cover over, as the scoring was causing it to be less powerful than needed, to overcome the siphoning. I did also replace my cheap plastic raw water strainer with a good perko one, but can't remember if this was before of after.

If you have scoring on the cover, and the other side is flat / same shape, it is worth a try. The old 1982 Yanmar is still going strong, although I only motor around 50 - 80 hours per year.

Good luck!
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Old 25-05-2011, 06:35   #19
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Re: How Much Is a Raw Water Pump Affected by a Scored Cover Plate ?

I had exactly the same issue on my 2GM20, turned it around and it was perfect.
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