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Old 04-04-2012, 12:57   #1
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Join Date: Apr 2010
Location: Newport News VA
Boat: Egg Harbor sedan cruiser 1970
Posts: 829
Jabsco seal redesign, my own idea

These seals on the saltwater pumps are frequently failing for me, the metal housing corodes internally where the rubber o ring sits, then the black carbon part can no longer move, it gets stuck, and then it leaks.

old seal parts carefully separated, you have to pry or bend or grind the metal crimp that holds it together. Dont damage the face, although you can flip it over as the other side is almost the same if you do.


Then place the bronze washer not spring into housing. I did this to beef up the sponge rubber and put more pressure into the system.


Then take a piece of sponge rubber, this piece is about 1/8 inch thick. It came off an aluminum car AC condensor.

Put the metal seal housing over the rubber
Cut a circle by tracing around with a razor
Then you need the inner circle cut, I inverted the seal housing, placed the rubber inside and used a flat extension, lightly whacked the sponge rubber into the housing inner circle lip to cut the hole. Perfect here wont matter, the rubber is very soft squishy and will conform sealing inside the housing



shows the sponge rubber sitting in the housing


shows the sponge rubber tube I used and the carbon seal sitting inside the housing


I may flip this one over as I slightly damaged the edge. Another one I did I lightly sanded down.
I was wondering if the sponge rubber should be greased with some marine lithium lube to aid in keeping the bronze or brass metal housing from corroding.

Anyhow this one was slightly rushed when disassembled. the other side of these carbon black seals can be used for the face. I have yet to see one of my seal wear out from use, they all wear out from corrosion in salt water.
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