1. Missed the live Ask the Expert event?
    Not to worry. Check out the archived thread of the Q&A with Ken Hutcheson, President of U.S. Lawns, and the LawnSite community on the Franchising Forum.

    Dismiss Notice

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
    Posts: 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
    Posts: 4,240

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

    piston slapper LawnSite Platinum Member
    Posts: 4,240

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

    IMG_0199.JPG
     
  4. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    A closer look at my avatar....

    IMG_0041.JPG
     
  5. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    That wingnut was probably important...

    IMG_0059.JPG

    IMG_0060.JPG
     
  6. BigFish

    BigFish LawnSite Silver Member
    Posts: 2,911

    Ya think?????
     
  7. BigFish

    BigFish LawnSite Silver Member
    Posts: 2,911

    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
    Posts: 4,240

    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 Silver Member
    Posts: 2,911

    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
    Posts: 4,240

    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...
     

Share This Page