SBT Jetski Engines, Parts & Accessories

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  1. #1
    Jun 2005
    Fox River Illinois

    Default 94 Monte Carlo 640 engine alignment

    well, I just got my new engine from SBT installed and it runs great. but...

    I'm getting a LOT of vibration, and I think the engine is mis aligned with the drive shaft (it's a 2 piece coupler with a dampener in the middle (which I've replaced with the newer style damper that doesn't have a puck in the middle).

    How do I verify/fix the engine alignment? I do have the shims back in, but I'm not 100% sure that I got them in correctly (I didn't keep track of them when I pulled the original engine out).


  2. #2
    Jun 2004
    Clovis, NM

    Default Re: 94 Monte Carlo 640 engine alignment

    Have you checked to make sure that the bearings/seals/clips in the drive line tunnel, and pump are in good conditon? I have a customer ski here in the shop that is vibrating, its in the drive line, and the bed plate is loose from the motor. This ski had 4 shims, 1 on each motor mount.

  3. #3
    Aug 2005

    Default Re: 94 Monte Carlo 640 engine alignment

    I have seen mention of a special alignment gauge for this type of thing. In lieu of the gauge, I would think you might test alignment by how the shaft engages the coupler. I don't know if you have a rubber spider type, or the type where the dhaft screws into the coupling. If you can slide the shaft out of the coupler:

    Spider: Can the spider be engaged smoothly without any prying or hard pushing?

    Threaded: Does the thread engage easily without any prying or hard pushing?

    If things assemble smoothly, this would indidcate an acceptable alignment.

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