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Thread: Crank Index

  1. #1
    rlharrison60's Avatar
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    Crank Index

    Im changing the heads on my 1050, and would like to check the index on the crank, before I put the new heads on. What is the proper way to check it?


  2. #2
    Race, wreck, repeat delagem's Avatar
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    There's a bunch of posts on how to check it on here, best way is a degree wheel; not so easy when the motor is in the ski. I did find mention of how to check the crank index in one of the Polaris factory manuals using a caliper while the ski is in place, however. Much easier, but less accurate.

    Place a piston at TDC, and use the caliper's depth measurement to check piston height on the other 2 pistons. Factory manual sez less than 2mm difference, when I checked my crank it was less than .6mm.

    For my test, I did every piston at TDC, and checked the other 2, just to be sure.

    It is helpful to use a dial indicator (runout indicator) to find TDC, and keep in mind dwell. The piston will stay at TDC for a short while as you roll the crank. Try to find the center of that TDC distance.

    If you don't have these tools, they are very cheap at Harbor Freight!

    BTW, it's never the crank index! At least, it wasn't for me.....

  3. #3
    rlharrison60's Avatar
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    Thanks, I looked for threads on it, but could not find threads on how to check it.

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