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Greetings,

I acquired an older 912UL that had a prop strike, and need to go through the inspections.  I can't justify buying the 877520 distortion kit for a (hopefully) one time use.  I can make or adapt a degree wheel, pointer, etc, but I have a question about the piston stopper tool.  Does it matter where the piston gets stopped?  As long as they're all stopped at the same height, their positions relative to each other will be the same, and it looks like that's all that's being measured.  I can make a tool that will stop the piston, but can't control the exact height.  Maybe it will be 20 deg BTDC, or maybe 40 deg, but I'm thinking that won't matter.  Is that correct?

Thanks,

Rusty

  • Re: Crankshaft distortion inspection tools

    by » 3 days ago


    Hi Rusty,

    I’m not sure where you live, but many service centers will rent these items out. Give one nearest you a call.

     


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


  • Re: Crankshaft distortion inspection tools

    by » 3 days ago


    East TN, but I'm not sure what service centers are around.  If the pistons can be stopped at any position, I can make my own tools for less than shipping a rented tool, then I'd have them if ever needed again.  I'll be putting the engine on a test stand for a while for an upcoming project, so no huge hurry.  Maybe I'll even stumble across a used kit. 

    Rusty

     


  • Re: Crankshaft distortion inspection tools

    by » 3 days ago


    I made a piston stopper to check the crank phasing on an engine and it seemed to work out OK and give sensible results. Here is a diagram of what I made.

    29764_2_Piston Stopper.jpg (You do not have access to download this file.)

  • Re: Crankshaft distortion inspection tools

    by » 2 days ago


    Kevin Stewart wrote:

    I made a piston stopper to check the crank phasing on an engine and it seemed to work out OK and give sensible results. Here is a diagram of what I made.

    That's outstanding Kevin.  Thanks very much!

    Rusty

     


  • Re: Crankshaft distortion inspection tools

    by » 2 days ago


    Hi Rusty

     

    the piston stop has to be mid stroke.  As the crank angle to the piston is at it fully extended or retracted points the travel is very low so hard to know what the degree difference there is.  Mid stroke the crank piston stop rod is going to show the differences more accurately.  Follow the process in the heavy maintenance manual.  Do not forget to check the crankshaft run out on the nose of the engine as well.  Do this with at least one spark plug removed from each cylinder to stop the influence of compression on the readings.  

     

    Cheers

     


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