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  1. #1

    Jet Pump Re-Build

    I'm just trying to get advice on the jet pump, I've learned the motor now I need to learn the Pump.


  2. #2
    When is it time to re-build the pump and what is the general cost of a total re-build of the pump. Also when is it time to replace the through hull bearing?

  3. #3
    David Drkvampire2001's Avatar
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    cant help ya when to re-build the pump, but grease youre thru hull bearing and that should be good, if it starts to leak, rebuild it or replace it. but if its leaking chances are youll also need to replace the drive shaft, so keep that thing greased up!!!!

  4. #4
    urugol's Avatar
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    Quote Originally Posted by Drkvampire2001 View Post
    cant help ya when to re-build the pump, but grease youre thru hull bearing and that should be good, if it starts to leak, rebuild it or replace it. but if its leaking chances are youll also need to replace the drive shaft, so keep that thing greased up!!!!
    Pump rebuild is about 50 bucks for the bearings and seals in a kit. I don't know what the service interval is, but is you pull the pump and spin the impeller it should spin freely without any noise. These are a sealed bearing so you can't grease them. If you do replace the bearings you will need to use a combination of heat and the freezer to get the job done.

  5. #5
    Those boogers are stuck pretty good huh?

  6. #6
    BlueFishCrisis's Avatar
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    Quote Originally Posted by nick072010 View Post
    Those boogers are stuck pretty good huh?
    You will likely destroy them, or finish destroying them, getting them out.....

  7. #7
    ripcuda's Avatar
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    Two different items being discussed.
    1. The jet pump: comprised of the stator housing with 2 bearings (spacer in between), 2 seals (both stacked on impellor end), cone, and the impeller stub shaft threw the middle that the impeller attaches to. This goes bad usually when water gets into the bearings past the seals (common) or past the cone (less common). If there is any play in the shaft which equates to play in the impellor (which will cause it to rub the wear ring walls) then it's bad and needs rebuilt. If the bearings are excessively noisy... likely from water intrusion, washing away grease, causing excessive bearing wear and noise... it's also bad and needs rebuilt. There are rebuild kits that include both bearings, both seals and o-rings for around $50 online.

    2. The through-hull bearing/seal carrier: this rides on the driveshaft on the inside of the hull attaching to the hull via short hose and clamps. It's job is to keep the water out while letting the driveshaft pass outside the hull to the jet pump. It has 2 metallic "bearings" (actually bushings) and a seal on each end. It also has a grease fitting (early models were needle type, later were normal zerk type) to fill this carrier from seal to seal around the driveshaft. This positive grease pressure helps keep water out. Over time, these seals wear out... especially if the driveshaft is bent or engine and jet pump are out-of-alignment... which causes excess vibrations in the driveshaft and premature wearing out of the seals and bushings. If the bushings still ride the driveshaft fairly tight... you can just replace the seals to rebuild it... but you can also still get the bushings if you need to replace those also. Seals range in price from $3 (local sources) to more from sources online. I've not priced the bushings.

    Hope that helps.

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ripcuda View Post
    ...Hope that helps.
    Very nicely stated.

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