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Old 07-18-2011, 10:30 PM   #5
FlyWright
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City: California Delta and SF Bay
Country: Sacramento, CA, USA (boat in Vallejo)
Vessel Name: FlyWright
Vessel Model: Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 11,018
RE: jabsco sea water pump advice

I replaced my impellers on my 4.236's a couple years ago as part of the routine maintenance. When I put the new impeller in on one engine, it wouldn't pump water. It really had me scratching my bal...er...umm...head. Come to find out the wear plate (back plate?) on the backside of the impeller was worn. I didn't even know it was there. Only after talking with the Jabsco rep did I learn that. I had to use the smallest jewelers screwdriver tip to free the plate from the pump housing. Jabsco sent me 2 replacements, free of charge, dropped it in and then all was well.

If I had only known about those plates ahead of time, I could have saved myself a lot of time and grief.

BTW, I went nitrile and have had no problems. Not sure which will last longer, but so far it's been fine. Nitrile seems a bit softer and more pliable. No difference in operating temps from what I see on the gages.
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