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This normal? Lateral piston movement 2F

Discussion in '40- & 55-Series Tech' started by Bluegrass40, Aug 12, 2017.

  1. Bluegrass40

    Bluegrass40

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    me and a buddy pulled my '78 2F because of an oiling issue. We pulled the head and noticed a fair amount of lateral piston motion. First time either of us had pulled a 2F head. Is this normal? The cylinders were pretty clean and there were no ridges at the top of the cylinder. We have not measured the cylinders yet...




    I'm sure further measurements etc will tell the story, but calling it for the night and curious...
     
  2. DougAustinTx

    DougAustinTx

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    There will be some side to side play on a well used engine. A new engine will only have about .002 to .003 clearance in the cylinder. It was hard to tell from your video how much clearance you actually have, but the purpose of the piston rings is to fill the gaps between the piston and the cylinder walls. Best way to see if there is a problem is to do a compression test before you remove the head.
     
  3. stock

    stock SILVER Star

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    Way to much. You could run a compression check, see where you are at, but it's time to pull the pistons, check the walls and go from there with boring/rings etc....
     
  4. Bluegrass40

    Bluegrass40

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    Thanks for the comments guys. Dry compression was recently checked and was between 110 and 120 on all cylinders. (Should have run wet as well but did not).