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Stump The Technician...Name That Failure,,,

Discussion in 'Mechanic and Repair' started by piston slapper, Dec 3, 2012.

  1. Wayne 55

    Wayne 55 LawnSite Member
    Messages: 108

    By the way that picture is a example of how NOT to mark the bore for piston to Crank alignment!
     
  2. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    Nope...Getting closer....:waving:
     
  3. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    Guess I stumped you guys...
    This is not a common failure...

    IMG_0199.JPG
     
  4. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    A closer look at my avatar....

    IMG_0041.JPG
     
  5. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    That wingnut was probably important...

    IMG_0059.JPG

    IMG_0060.JPG
     
  6. BigFish

    BigFish LawnSite Platinum Member
    Messages: 4,065

    Ya think?????
     
  7. BigFish

    BigFish LawnSite Platinum Member
    Messages: 4,065

    So what failed first? The snap ring, or the piston? It was the pin that gouged up the wall, right?
     
  8. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    Well....you're not going to like this...but nobody gave me the correct answer....
    The snapring didn't fail...it was NEVER INSTALLED....
    I searched every inch of the inside of that engine and didn't even come up with a fragment of a snapring..
    As I stated...the engine would run great for hours at a time...and then it would just develop an awful hammering knock...
    Shut it off and restart it...ran perfect again...didn't even smoke...
    It was a warranty....these engines are still built by people...
     
  9. BigFish

    BigFish LawnSite Platinum Member
    Messages: 4,065

    So the broken side had a snap ring in place,no?
    And the good side did not have the snap ring, letting the pin do its thing, right?
     
  10. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,329

    Nope...good side had a snapring....
    From what I could figure..when the wristpin dug into the cylinder wall...
    The shock shattered the pin boss on the side nearest to the gouge...
     

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