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  1. #1
    ripcuda's Avatar
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    MSX engine and driveshaft couplers

    Hi Guys,
    Broke a finger off the engine coupler the other day when trying to remove it from the PTO stub-shaft on my MSX150 engine. I was loosening it the correct way but man was it tight... bummer.




    Question: Does the MSX110/150 use the same engine-side coupler as the other MSX models?

    Question: Is the engine-side coupler (one I broke) the same part as the driveshaft-side coupler?

    Question: Anyone got one you could sell me?


    Thanks!
    Cheers!


  2. #2
    ripcuda's Avatar
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    Okay... little more research... I think answers one of my questions.

    Per Polaris parts website... All MSX models share these two part numbers:
    [5631450 Coupler, Drive, Pump]
    [5631451 Coupler, Drive, Engine]

    So not Weber-engine specific... good. But being different part numbers, looks like engine-side and pump-side couplers are different. Can anyone confirm?

    And if anyone has one to sell me... much appreciated!

    Cheers!

  3. #3
    Moderator beerdart's Avatar
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    Ill look tonight I should have a few laying around.

  4. #4
    Moderator beerdart's Avatar
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    Looks like the engine side is M24 and the shaft side is M20. I have a complete set if you need it.

  5. #5
    ripcuda's Avatar
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    Ah... that explains the difference. Thanks for the lead on your available pair.

    Does anyone know... can you get the engine-side coupler off with the engine in the hull?

    If you pull the pump and slide the driveshaft and pump coupler rearwards... I'm wondering if there is enough space to unthread the engine-side coupler and get it out... or do you have to disassemble the pump-side coupler and pull the driveshaft out first?

    I'm wondering if I could JB-Weld this finger with a small bolt tapped into the finger for strength, thru the coupler body. If it failed... just wondering if I could get the coupler off to replace while it's all in the hull. Yeah, I know... redneck fix.

    Cheers!

  6. #6
    fixer's Avatar
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    seems high risk to me. I wouldn't want that thing to come apart @ rpm. You're in there now's the time to fix it.
    Quote Originally Posted by ripcuda View Post
    Ah... that explains the difference. Thanks for the lead on your available pair.

    Does anyone know... can you get the engine-side coupler off with the engine in the hull?

    If you pull the pump and slide the driveshaft and pump coupler rearwards... I'm wondering if there is enough space to unthread the engine-side coupler and get it out... or do you have to disassemble the pump-side coupler and pull the driveshaft out first?

    I'm wondering if I could JB-Weld this finger with a small bolt tapped into the finger for strength, thru the coupler body. If it failed... just wondering if I could get the coupler off to replace while it's all in the hull. Yeah, I know... redneck fix.

    Cheers!

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ripcuda View Post
    ... Does anyone know... can you get the engine-side coupler off with the engine in the hull?

    If you pull the pump and slide the driveshaft and pump coupler rearwards... I'm wondering if there is enough space to unthread the engine-side coupler and get it out... or do you have to disassemble the pump-side coupler and pull the driveshaft out first? ...
    On my MSX140 there was JUST enough room to slide the impeller side coupler rearwards (with jet pump removed) and lift the engine up off the mounts.

    I do not recall if there was enough room to actually unscrew the drive spider and get it out. My guess is no, too tight. But all this is with the three cylinder 2-stroke engine, not the Weber.

    Note that the spider drive coupler pieces may be the same but the drive shaft is (I think) different length on the Weber models.

    Now might be a good time to install a new rubber piece in the drive coupler. I also filed the metal casting ridges smooth on my coupler and applied silicone lube to the rubber spider before reassembly.

    Shaft alignment is important. A slight misalignment when I first reinstalled my through-hull bearing carrier resulted in vibrations from the drive spider strong enough to completely shake the shaft seals out of the bearing carrier!

  8. #8
    ripcuda's Avatar
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    Good advice K447... thanks!

    And great point Fixer... I hadn't thought through the possibilities of it letting go at full RPM. That little metal finger could do some damage. Think I'll replace it.

    Cheers!

  9. #9
    GGG's Avatar
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    The drive shaft is the same, they just used spacers on the threads between the driveshaft and coupler. But I still believe you won't have the room without unbolting the motor from it's mounts and sliding it foward

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