engine loads up in reverse with rebuilt pump
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engine loads up in reverse with rebuilt pump

  1. #1
    Member HaulsBalls's Avatar
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    Default engine loads up in reverse with rebuilt pump

    I recently rebuilt my 12JC and had it out for the first time the other day. I noticed that when I reverse the bucket covering the nozzle my engine seems to load up noticeably and drop a 2-300 rpm, is this normal? Is just having a fresh impellor and wear ring build that pressure/load when the nozzle is closed off and redirecting flow?
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  3. #2
    World's #1 Jet Drive BerkeleyJet's Avatar
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    This isn't something we've seen before. It's not normal but dropping the reverse bucket just redirects the water, it shouldn't have any effect on RPM.

    "Start Berkeley Original, Stay Berkeley Original!"
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    Senior Member cruzer's Avatar
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    Shifter/throttle on the same handle or Forward/Reverse handle and foot throttle?
    Cruzer
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  6. #4
    Hoodys and swim trunks Elkidminoltu's Avatar
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    Quote Originally Posted by cruzer View Post
    Shifter/throttle on the same handle or Forward/Reverse handle and foot throttle?
    I'm thinking along the same lines. Check your adjustements on your cables at the ends, specifically the throttle cable. In Neutral position, your throttle cable may be pushing/pulling on the carb linkage and keeping your idle up, then when you go in reverse it drops it down onto the idle adjustment pin on the carb,thus lowering RPM. Unhook the throttle cable, fire the motor, and see where it idles and if it changes when you fwd-rvrse the bucket.

    It should be adjusted so you are able to throttle the boat in reverse some.
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  7. #5
    Senior Member Cowboy_Mike's Avatar
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    Quote Originally Posted by cruzer View Post
    Shifter/throttle on the same handle or Forward/Reverse handle and foot throttle?
    That would do it!!
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  8. #6
    Senior Member nick's Avatar
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    He has a foot throttle and a fwd/reverse lever, they are totally seperate and not related on his boat.

    Any other ideas?
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  9. #7
    "Mad" Member Jet Mad's Avatar
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    I had the same problem on a Hamilton Jet unit. Doing emergency stops, the bearing damaged the bearing cap, the shaft started moving forward and backwards inside the pump, pushing the impellers against the stators and wear rings when reversing. The resulting friction resulted in RPM drop when I reversed.

    Wikus
    Last edited by Jet Mad; 05-04-2011 at 12:12 PM.


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