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New 912 will not turn over by hand

in 912 / 914 Technical Questions 8 years ago
I am building an RV 12 in Scotland.
The new engine has been installed but not connected to any controls or power.
Cannot hand turn the prop more than 90 deg in any direction without it hitting a stop. Plugs are out and no oil in the engine.
Engine still under warranty and problem has been referred to U.K. Rotax Distributor but waiting for response.
No obvious reasons for this such a sticking valve etc.
Any thoughts.

Ken Sangster

  • Re: New 912 will not turn over by hand

    by » 7 years ago

    Did someone leave the crankshaft lock pin in place?? Also, we had 912 in a local shop that swallowed a small locknut via the air intake tract that jammed between the piston crown edge / cylinder head thus preventing piston movement beyond a certain point. Unlikely in your case but who knows?!?
      
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  • Re: New 912 will not turn over by hand

    by » 7 years ago

    Thanks for your fast response to my problem.
    The crankshaft locking pin is not there. In fact did not even receive one with the engine i.e. No tool kit.
    Have some limited knowledge of the 912 ULS as I fly a Eurofox Glider tug every weekend.
    As regards any foreign objects causing this problem that cannot be ruled out but I am reluctant to do any dismantling until the Rotax Distributor decides what to do. Looks like I may have to resign myself to removing the engine.
    Thanks again. Ken
      
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  • Re: New 912 will not turn over by hand

    by » 7 years ago

    Pull off the plastic flywheel cover plate on the back of the engine.It may only be the flywheel hitting a trigger coil pickup. This has happened. Make sure the air gaps are correct on each trigger coil around the flywheel. This is easy to do.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Ken Sangster
      
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  • Re: New 912 will not turn over by hand

    by » 7 years ago

    Thank you Roger you may well be right.
    I will need to remove the engine as there is very little room between the cove plate and the firewall in an RV 12.
    I thought that I would probably have to remove the engine anyway once the U.K. Rotax Distributor contacts me.
    Ken
      
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  • Re: New 912 will not turn over by hand

    by » 7 years ago

    Problem solved.
    Removed the engine and discovered that the flywheel cam was being fouled by a trigger coil pick up.
    This was the last thing to check and fortunately it was easily rectified and the engine went back the same day.
    Building continues and thanks for all all the feedback I received.

    Ken
      
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