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Thread: jet pump

  1. #1
    CarlosPWC's Avatar
    Join Date
    Dec 2009
    Cape Coral, FL

    jet pump

    How can I know if my jet pump needs to be rebuild. is there any sound or any other way to tell if it is getting ready to go.

  2. #2
    bowsniper's Avatar
    Join Date
    Aug 2008
    Theres 2 bearings and some seals for the rebuid. usually people find that the fins in the stator are broke and they need to be fixed first, then go ahead with the bearing kit. You could take your pump out and pop the impellor off and see how easy the stub shaft turns. at that point, you could check the seals too.

    I took mine apart and found 1 bearing to be decent and the other was bad. if its never been changed, its time.. the seals were wasted on 1 side too.

  3. #3
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    near Toronto, Canada
    You can visually inspect the impeller and stator blades and wear ring. Look for gouges and excess clearance between the blades and the surrounding wear ring. Specified blade maximum clearance is 0.020 inches, and prefer to be 0.010 inches or less.

    Look in from the intake grate, and through the pump exit nozzle (engine not running, of course).

    To properly check the impeller bearings, it is best to remove the jet pump first. Then you can spin the impeller by hand, and listen/feel for roughness, grinding or slop/slack in the bearings.

    A good one will rotate very smoothly, with zero noise or gritty feel, and no side to side or in and out play.

    When removing the tail cone, have the cone pointed at the ground. It is common for water to get into the outer pockets of the cone. This does affect the operation of the bearings.

    By pointing it towards the ground while you wiggle it off, you prevent water from those outer cone pockets splashing into the interior, where the bearings are.

    Once removed, inspect the inside of the stator rear bearing area for signs of water, rust, or other bearing problems. It should look like new in there, with zero moisture and no rust.

    The actual water seal for the tail cone is a large O-ring set into a groove inside the stator wall. Make sure that O-ring seal is in good condition, and lightly greased with marine waterproof grease before re-assembly.

    Also inspect the plastic tail cone for hairline cracks, which might allow water to get inside.

    Until the impeller bearings have completely failed, is is usually impossible to tell if they are dying while the jet pump is installed on the hull.

    Once the stator bearings have failed, there will often be a vibration, whining or grinding noise, and sometimes the impeller will lock up completely, stalling the engine.

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