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Is my water pump failing?

Discussion in 'Engines' started by incoming, Jun 11, 2025.

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  1. Pascal, Jul 15, 2025
    #21
    Pascal

    Pascal Senior Member

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    I would absolutely do an oil sample before replacing the oil
  2. incoming, Jul 27, 2025 at 7:02 PM
    #22
    incoming

    incoming Active Member

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    Cocoa Beach, FL
    Ok I’m stumped. How do I get the main gear off the shaft so I can disassemble the old pump? I got the front nut off with an impact wrench while gripping the shaft with pliers. But I can’t get the gear off. I thought it would just slide off with the nut gone. I’ve tried prying it off with pressure on both sides, gripping it with a rag to twist it, etc. it won’t budge.
    IMG_3355.jpeg
  3. Capt Ralph, Jul 27, 2025 at 8:12 PM
    #23
    Capt Ralph

    Capt Ralph Senior Member

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    There is probably no key. A perfect machined taper fit.
    For those familiar with the NL raw water pumps, the same.

    In the swamps we don't have fancy hydraulic presses or pullers;
    Put the nut back on the shaft. Face of the nut flush with the end of the shaft.
    Apply pressure between the pump body and the back of the gear. Bars or big asp flat screw drivers. Chisels could work also.
    With a nice 3lb hammer, hit that nut and shaft hard and square.
    PING, all loose.
  4. incoming, Jul 27, 2025 at 10:07 PM
    #24
    incoming

    incoming Active Member

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    ok this makes sense. I tried prying between the pump housing and gear with two wrenches but I was afraid to get too…violent with it. There is a key way though in the gear disc. Just like an impeller would have. Does that change anything?
  5. Capt Ralph, Jul 27, 2025 at 10:30 PM
    #25
    Capt Ralph

    Capt Ralph Senior Member

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    Oh, Er, Ah, The key-way is confusing. May have to find a 1.4KG hammer.

    There is a center hole in the shaft center end. This may require a gear puller.

    The last gear puller around here was spit out in the mud when trying to pull one of Frank's teeth.
    Last edited: Jul 27, 2025 at 10:36 PM
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