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ComputerJoe
#1 Posted : Friday, June 04, 2010 8:43:34 AM(UTC)
ComputerJoe

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I have been struggling with these trim tabs that would work sometimes, but mostley not.
They have been driving me mad!
I finnally figured out that I tightened the face plate (11) too much after putting in replacement o-rings to stop the leaking.
The face plate was pressing against the star shaped impeller enough to keep it from turning.
Now to figure out how tight is tight enough to stop the leaking but not too tight to stop the impeller from turning.
Absolutely no evidence of there ever being a gasket there.
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ComputerJoe
#2 Posted : Tuesday, June 08, 2010 11:33:10 PM(UTC)
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Thought I posted it earlier but I found out that the solenoid/valves on these things should ohm out at about 8.4
A lot of hard looking turned this up at iBoat.com, Bennett could not even answer the question when asked, but they did call back after I figured it out with the same answer.
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DiverDennis
#3 Posted : Wednesday, June 09, 2010 5:50:58 PM(UTC)
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Good job Joe.
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dougrose
#4 Posted : Thursday, June 10, 2010 5:53:29 AM(UTC)
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O-rings shouldn't need to be tightened much, they aren't like gaskets, they seal when just slightly deformed. They do need to mate against an absolutely smooth surface, and coating them lightly with silicon grease often works. I haven't taken my trim pump apart yet, so these are general comments, not experience-based...


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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ComputerJoe
#5 Posted : Friday, June 11, 2010 12:57:47 AM(UTC)
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Doug,

The o-rings are let into the impeller side of the pump and the mating surface, a plastic face plate, screws down with 6 screws. If tightened to what I consider snug the impeller is pinched and does not turn. I'm a bit worried that they might be lose enough to vibrate out right now so I'm considering thread lock.
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