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This looks very bad! In attempting to remove the flywheel/magneto, I managed to break off the Crankshaft locking pin. Half of it is still in the engine, though not in the threaded portion where the tool is inserted. It was a clean break and I was able to extract the top half with only minor thread damage. Remaining portion is shown.

Is there any hope of extracting this without splitting the case? 

Any help would be greatly appreciated.

10116_1_Pin.jpg (You do not have access to download this file.)

Model IV-1200 Tricycle Gear w/ Speed Wings

RV4 in Progress

  • Re: Broken Crankshaft Locking Pin

    by » 4 months ago


    I don't know the answer to your question, but I would like to know how this happened.


  • Re: Broken Crankshaft Locking Pin

    by » 4 months ago


    If the tip broke off clean and fell into the lower case, maybe you could fish it out with a magnet through the oil return line threaded opening.  I have a small magnet soldered on the end of a #14 copper wire for those type of tasks.  Also, you could remove the #2 cylinder and get at it that way, which would also give you a better view to check things out.  

    At 1:30 into this video there is a cutaway view of the locking pin engaging the crankshaft, you can see a section of the #2 cylinder opening on the left side.  

    https://www.rotax-owner.com/en/videos-topmenu/free-videos/245-lock147


    Thank you said by: RotaxOwner Admin, DAVID R WALKER

  • Re: Broken Crankshaft Locking Pin

    by » 4 months ago


    Ken Ryan wrote:

    I don't know the answer to your question, but I would like to know how this happened.

    Pretty simple... I watched a different YouTube video instead of the one on this site and did not lock the crankshaft correctly. The pin was not properly mated to the slot on the crankshaft, which should have left about 1/2" of the pin still extended. If you attempt this procedure and the locking pin is flush with the case the crankshaft is not in the proper position and may snap off. Watch the video on this site and you will be fine. 


    Model IV-1200 Tricycle Gear w/ Speed Wings

    RV4 in Progress


    Thank you said by: Ken Ryan, RotaxOwner Admin

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