Shaft Alignment

Discussion in 'General Conversation' started by quickstep192, Jun 24, 2019.

  1. quickstep192

    quickstep192 Well-Known Member

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    When I throttle up, I get a rattling type vibration between 1800-2200 rpm. I'm guessing I need a shaft alignment.

    Can someone provide guidance on how to check for alignment and how to adjust it, or better yet, recommend a guy near Annapolis that can do a shaft alignment?
     
  2. seatux

    seatux Well-Known Member

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    Back off the four bolts on the trans coupler plate, remove one bolt and install a washer between the two flanges, slip the bolt back in thru that washer and tighten just that bolt. Now use a feeler gauge nest to that washer to see what the gap is, and check next to the other three loose bolts to see what those are gaped at, now rotate the shaft/coupling and recheck. There is debate as to how many thousands they should vary, obviously the closer the better.

    Before you go thru all that, check the play in your cutlass bearing and be sure all the motor mounts are tight.
     
  3. quickstep192

    quickstep192 Well-Known Member

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    The motor mounts I get, but how do I check the cutlass bearing for play?

    (This is where I begin to feel like I’m getting in over my head)
     
  4. seatux

    seatux Well-Known Member

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    It should be in contact with the "rubber" splines all the way around,,grab it and see if you can shake it, there shouldn't be noticable play in it.
     
  5. quickstep192

    quickstep192 Well-Known Member

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    While I'm checking, I'm wondering where I might begin to chase the noise I heard last week. I was backing down kind of hard and heard an unhappy sound. It sounded like a grinding noise. I've had that happen before when the rudder is too far over and contacts the prop in reverse, but there were no marks on the prop or on the rudder.

    It didn't happen again. Any suggestions on other things to check "while I'm in there"
     
  6. Fish Witch

    Fish Witch Well-Known Member

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    A loose prop shaft zinc can make noise in reverse so check to see they are tight. Also doubt your prop and rudder come in contact unless something is really wrong with your tranny or motor mounts. There shouldn't be much aft movement of the prop in reverse.
     
  7. NDaniels

    NDaniels Member

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    My 26' PH makes what could described as a grinding noise when backing down hard, mostly in calm water. Haven't found any issues. The best I can come up with is the exhaust flappers are being forced shut and cause some extra backpressure on the motor.
     
  8. Fish Witch

    Fish Witch Well-Known Member

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    Could be a loose shaft zinc that gets pushed back on the strut.
     
  9. Ship

    Ship Well-Known Member

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    Quick, all your symptoms point to a bad damper plate. The springs are probably broken.
     
  10. quickstep192

    quickstep192 Well-Known Member

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    That doesn’t sound good.

    Is that something that can wait until fall?
     

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