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Old 02-09-2019, 12:42 PM   #7
f508
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City: Belmont, California
Vessel Name: MaryAnn
Vessel Model: 48 DeFever
Join Date: Jun 2017
Posts: 117
Thanks for the replies.

If I can't figure this out, I think rebuild might be my only option.

Looking at the diagram there don't seem to be any parts missing as far as I and my mechanic have disassembled it.

The bearings feel perfectly smooth with no play. The shaft won't spin on its own when you spin it but I think that is because it has water-tight seals. There is no binding or wobble.

I played with an electric pump but I think I undersized it so the flow was less than I was happy with. I tried an 8 liter/minute pump visualizing that volume seemed fine, but in reality, the head in the exhaust side downstream of the muffler and the exhaust back pressure reduced the flow to far less than the stock pump. So now I am back to that.

David, sharp eye on the eccentric design, I missed that and couldn't figure out how it pumped, but you are right the shaft is built eccentric to the water chamber to create the pumping action.



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