[Question] basset t valve
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basset t valve

  1. #1
    Member my70455's Avatar
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    Default basset t valve

    my valve has a good ball and spring . it doesnt seal completely . is that right or do i have an issue

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  3. #2
    Senior Member sandeggo's Avatar
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    How do you know it's not seating? If your headers are dry at idle it is seating. If not then I'd order a ball and spring and drop them in to do a cheap test. Perhaps the water pressure at idle is opening up the spring a little. Gotta troubleshoot the system.

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    Super Moderator HammerDown's Avatar
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    Hold the bus > before ordering new parts > sometimes debris can get between the ball and its seat...happened to me a few times before I started filtering the river/lake water into the T.
    Also, I keep my T mounted to where I can get to it 'if' I suspect a problem > simply remove the inlet hose and poke the ball with a screwdriver etc. It's also good practice to spray some WD40 into the checkball area.
    Also, you can simply put the T in a vice and unscrew top to visually check the ball, spring and seat for potential problems.

    For some 15 years the Bassette T has been a trouble free system > especially AFTER I added a pre-filter into it.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Member my70455's Avatar
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    i took it off and cleaned it then i blew through it . and it doesnt seal tight .
    the ball and spring look good .
    i have two valves and put the good parts into both with the same result

  7. #5
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by my70455 View Post
    i took it off and cleaned it then i blew through it . and it doesnt seal tight .
    the ball and spring look good .
    i have two valves and put the good parts into both with the same result
    Ball chatter may have hammered the seat...try taking one ball, set in in the T in a vice and with a brass drift give it a decent solid but not killer hit. Then, toss that ball and insert the other ball and check it.
    You could also weld the ball to a rod and use lapping compound to dress the seat up > a new ball will still be needed.
    Or, just order a new T
    BTW you can shim more 'closing pressure' on the spring with a stainless washer or two.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member 1975sleekcraft's Avatar
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    make sure you are putting the spring in the right way!!!

    there are two ways to install it....

    the smaller side rides the ball .....

    most people may not agree with this one but you can also pull the spring a little bit to give it more tension........

  9. #7
    Senior Member jetboatperformance's Avatar
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    Early Basset Ts had a different seat design, later they recut seats a bit differerently to overcome "chatter" and spring breakage Tom

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