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  1. #1
    Matrix 200 suparoo's Avatar
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    Part possibly missing from drive shaft MSX 140

    I'm just putting the unit back on the Matrix and I think there is a part missing. After reading the info on aligning the coupler it mentions the "bump stop" at the end of the drive shaft and the IPB shows it to be at the end of the drive shaft, between that and bolt that holds the impelor in place. The only rubber part on mine is the seal that goes around the drive shaft and into the impellor. Is that right ? The IPB only shows one part !!
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  2. #2
    Connecticut CrazyA's Avatar
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    Sounds like you're missing the driveshaft bumper, but it goes between the end of the driveshaft and inside the impeller.

  3. #3
    Matrix 200 suparoo's Avatar
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    Anyone got one handy they could measure the length of and I will punch some circles out of 1/8" thick rubber I've got to make up one until I can order one in from the U.S with some other stuff.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Watcon sells a Teflon version of the Driveshaft Dampers

    Unlike all the other Polaris PWC models, the MSX drive line only has one bumper, at the impeller end of the drive shaft.

    Everything else has the same rubber bumper at both ends of the drive shaft. And the Genesis drive shaft has TWO at one end.
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  5. #5
    Matrix 200 suparoo's Avatar
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    Got one !!!. Gave my local polaris guy a call with the part # and unbelievably he had one. Don't know how long its been without one, hopfully its done no damage. I checked the coupler which is getting tired so come winter I'm going to strip it down. 125hrs on it now and all salt water. Hopefully be 150hrs by winter so time for hull bearings etc.

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by suparoo View Post
    ...I checked the coupler which is getting tired so come winter I'm going to strip it down.

    125hrs on it now and all salt water. Hopefully be 150hrs by winter so time for hull bearings etc.
    If you have not done so yet, make sure you rebuild the MSX through-hull bearing carrier assembly.

    100 hours is about it for the MSX shaft bearing in salt water. If it goes too long without a rebuild, the bearing rusts onto the shaft itself, and the shaft may be ruined.

    Unlike the other Polaris models, the MSX bearing carrier has no facility for adding grease. Once water gets past the seals, it tends to stay inside - where the bearing is

    Also, it seems that at least some MSX through-hull assemblies were incorrectly assembled at the factory, exposing the pump side seal's garter spring to corrosion. Further reason to make sure the bearing gets rebuilt sooner rather than later.

    Sealed MSX through-hull drive shaft bearing assembly PN 1350091
    How to check for leaks at the MSX through-hull bearing
    Recommended replacement/rebuild of MSX through-hull seals is every 100 hours or 3 years (especially in salt water)
    How to remove the MSX drive shaft
    How to remove and replace the MSX seals and bearing
    Polaris MSX through-hull bearing support carrier rebuild kit is PN 2858113
    Generic replacement bearing is a 6205.
    The inner seal is 25 x 52 x 10 (substituted with generic 25x52x7)
    The two outer seals are 25x35x10 (substituted with generic 25x35x7)

  7. #7
    Matrix 200 suparoo's Avatar
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    Reasembled the pump with the missing bump stop and the ski is completally different when run out of the water. All the pump noise is completally gone. It used to have quite a rattle when you ran it on the hose. I also put some more grease on the spline which probably helps as well.

  8. #8
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Yep,Keeps the shaft from chattering back and forth.

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by suparoo View Post
    Reassembled the pump with the missing bump stop and the ski is completely different when run out of the water. All the pump noise is completely gone.

    It used to have quite a rattle when you ran it on the hose. I also put some more grease on the spline which probably helps as well.
    Having all the required parts in place does make a difference

    The greased splines also helps, of course.

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