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post #1 of 4 Old 06-07-2007 Thread Starter
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Correct raw water pump replacement?

We have a Universal M-12 diesel and it has a Sherwood raw water pump that needs replacing because of a worn shaft. According to my person doing the engine work, the Sherwood replacment is no longer made and the appropriate replacment is an Oberdorfer pump... (#N202M-15 Universal 301357.) I think he has the right pump but is there anything that i need to be concerned about? (I'm completely new to diesel engines.)
Sorry for the vague question.
Thanks,
Joel

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post #2 of 4 Old 06-07-2007
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Joel, You can contact sherwood directly here:
Marine-Distribution - en-us - Sherwood Pumps
If you buy a new pump, take the old one to a mechanic and have it rebuilt, so you have a spare.

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post #3 of 4 Old 06-08-2007 Thread Starter
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Thanks for the link bestfriend. I'll see what Sherwood has to say. I think it will be fine because my manual shows two possible pumps for the Universal M-12... I just happend to have the one they don't make anymore so the Oberdorfer is probably the correct replacement.

I will definately have the old pump rebuilt because i had just purchased a new impeller and seals for it! What do you think a rebuild will cost me though? The problem area was the shaft... it was "questionable." Cost effective to just buy a new one when needed?... or... good to have a spare because i may need it while cruising?

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post #4 of 4 Old 06-09-2007
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Joel73,

Something to watch for if you switch to an Oberdorfer from a Sherwood. Our engine ( Universal M25) was notorius for overheating at the 3/4 to full throttle range. This stopped when we changed from an Oberdorfer pump to a Sherwood (our yard recommended the change, when our old pump was worn out). An increase in water at the exhaust and better cooling was immediately apparent. I didn't find out why until some reasearch on the net, even though both pumps are used for the same applications, the Sherwood pumps approx 7gpm versus the 3.5gpm of the Oberdorfer. In my case this made a serious differance.

EG
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