Berkeley jet rebuild
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Berkeley jet rebuild

  1. #1
    Junior Member clevj001's Avatar
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    Default Berkeley jet rebuild

    Hey guys. First time really posting been reading through a lot over the last few months.

    I am in the process of rebuilding my Berkeley JB pump and I got the bowl off and have found the impeller nut has a spanner nut? (see pic) Not seen this in all the posts i have searched about rebuilding the pump. I am thinking I may just cut it off. I have the tools in the American Turbine repair manual to remove the impeller. I am just wondering if anybody has come across this style nut and had any other ideas than cutting to take it off.

    I have been soaking it with penetrating oil for a few days now as I haven't had time to get in the garage and work to get it apart.

    My plan is to just re seal and put new bearings in the pump. From what I can tell the impeller looks good.

    Also does the wear on the shaft look ok? there are a few grooves in it but nothing too deep.

    I have built plenty of engines, transmissions and rear ends over the years but this is my first jet pump rebuild.

    thanks guys for the input it is much appreciated
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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Sometimes it takes a long cheater pipe on the wrench to break the nut loose.i have had to cut a couple impellor nuts, not fun.if the motor tries to turn as your backing off impellor nut try and use a pipewrench on the driveshaft yoke prior to it goin into pump and let it jam against a stringer

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  4. #3
    Senior Member johnf's Avatar
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    Looks like it is out of boat from picture. That makes it really hard to hold it still. If you can cut it off without jacking the shaft up go for it, will save alot of time, looks like a new nut is in order anyways! If your concerned about shaft take it to a machine shop and have it checked!!!With a new seal in the bowl that wear on shaft is very minimal. JMO Good Luck!!!

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  6. #4
    Senior Member 67weiman's Avatar
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    The first time I pulled my pump apart, it looked like that. Lots of penetrating oil and an impact gun. Work the nut back and forth in very small increments to work the penetrating oils into the threads. Or cut it off.

  7. #5
    Senior Member spectralen's Avatar
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    Default Clamp It!

    I just rebuilt mine. I had to cut mine off, well I started with the cut-off wheel and after removing a nice groove in the nut I switched to a hammer and chisel. Make sure you stabilize the pump. I c-clamped mine to a black and decker type work mate bench. Also have the pump to one side of the bench so the turning force will make it less likely to flip. I used a long screwdriver piece through the installed u-joint to keep the shaft from turning.

    These pics are of re-installing the nut.
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  8. #6
    Senior Member SBS933's Avatar
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    Impact didn't work for me either, but a long ass cheater worked like a charm.
    Believe Nothing you hear and 1/2 of what you see.

  9. #7
    Senior Member jetboatperformance's Avatar
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    Just looking at that rusty nut I gotta hunch its going to take some heat and maybe brute force , We use a special hardened impact deep socket, and 3/4 drive Impact , occasionally worse case you have to resort to the carefull application of a cutting torch (will cut the nut and not damage the shaft or impeller ..

  10. #8
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    FYI: Photo of my pump clamp is attached. Good luck!
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  11. #9
    Senior Member tigertooth's Avatar
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    Default chisel force.

    Air chisel or chisel and hammer usually work to spin but off if you don't have a 3/4 impact.

  12. #10
    Junior Member clevj001's Avatar
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    thanks everyone for the input I appreciate it. I will update the thread when I get it off.

  13. #11
    DJG
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    Cutting torch is the only way to go. I have cut tons of those off and the torch is by far the quickest way.

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