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Can Engine mis-alignment cause main bearing failure?

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  • Can Engine mis-alignment cause main bearing failure?

    I just viewed the SBT video on alignment (I got to say this feature ROCKS). I put my motor back together with the stock shims in the original positions. The motor mounts are in great condition. The straightedge looks good on the three sides I can see. The bottom of course is blind.

    Can a mis-aligned motor stress the main crank bearings and cause a failure? The two PTO's do not touch, and I thought the rubber coupler would take up any slight mis-alignment.

    Is there any wear patterns I should look for on the coupler?

    Would it be better to give a portion of the PTO a slight raise. (I guess I'm asking since I can't see the bottom), should I do like a "pre-load", in one direction of the PTO? I'm not sure which side the engine would torque under load.

    Thanks,
    :emotisun SunCoast ShuttleCraft

  • #2
    Re: Can Engine mis-alignment cause main bearing failure?

    The rubber dampner does soak up a bit, and it's less critical on models that use one - but 90% of Sea-Doos are a direct metal to metal coupling. Yes a really bad alignment can stress rear main bearings. Most often though what goes are the PTO splines. Sometimes it will cause vibration and you might see bolts backing out too.
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