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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
    #22
    incoming

    incoming Active Member

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    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
    #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
    #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
    #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
  6. incoming, Jul 31, 2025
    #26
    incoming

    incoming Active Member

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    I ordered a gear puller set - wasn’t too expensive. Will report back hopefully when I have it apart.

    Separately, on the matter of the gears, with access covers off I was able to inspect most of the gears, including rotating them, and not seeing any other signs of wear or damage. Seems the water pump gear was the only damaged one. Not sure how to explain that, but a good sign nonetheless. Still plan to pull a sample once I can run it again and get things stirred up.
  7. DOCKMASTER, Jul 31, 2025
    #27
    DOCKMASTER

    DOCKMASTER Senior Member

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    If you have trouble getting the gear off, any basic machine shop should be able to easily press the gear off then press the new one on. Even a simple automotive machine shop can do this for you.
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