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Rod carnage....... Lol

Discussion in 'Chainsaw' started by alexcagle, May 4, 2019.

  1. alexcagle

    alexcagle Cutoff Saw Specialist

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    20190430_153333.jpg Owie.
    Stopped so fast it sheared the flywheel keyway.
     
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  2. I don’t think JBWeld is gonna work.
     
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  3. buzz sawyer

    buzz sawyer Addicted to ArboristSite

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    I thought "Rod Carnage" was a new pro wrestler.
     
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  4. undee70ss

    undee70ss Homelite nut

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    Any ideas on why it failed like that?
     
  5. CausticUC

    CausticUC Need to fix that pull!

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    With that bend the piston must have went out the port or the cylinder failed spectacularly!
     
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  6. Bobby Kirbos

    Bobby Kirbos Scrounger of Cellulose Based BTUs

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    Agreed. Do you have a picture of the jug? If it were a matter of something blocking the piston, there would be a 2nd bend somewhere in the rod. The fact that it's bent in 1 spot tells me that the rest of the energy was absorbed by something other than the rod.
     
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  7. blsnelling

    blsnelling Site Contributor

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    How does a rod bend sideways?
     
  8. alexcagle

    alexcagle Cutoff Saw Specialist

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    Stihl FS90.
    One of the original wrist pin clips was in the bottom crankcase pan.
    I'm assuming the wrist pin shifting to one side caused stress on the piston enough to rip a web out of it, then on the return stroke it slammed the piston hard enough to bend the stamped steel rod.
    The cylinder and valves weren't damaged.
     
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  9. blsnelling

    blsnelling Site Contributor

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    I was on my phone and didn't see that piece of junk stamped rod.
     
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  10. Tobystihl

    Tobystihl Creaky Limb Tree Care

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    Looks like when a car hydraulics after travelling through deep water!
     
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  11. alexcagle

    alexcagle Cutoff Saw Specialist

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    I had several junker 40mm HT130 engines I got a few years back to scavenge, and in under an hour, I pieced a nice strong trimmer together.
     
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  12. rd35

    rd35 Just an average Joe's brother!!

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    My guess.....too many RPM's jerked the wrist pin out of the bottom of the piston by breaking out the pin holes....and then the rod commenced to hammering the bottom of the piston and got bent as the crankshaft coasted to a halt!
     
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  13. alexcagle

    alexcagle Cutoff Saw Specialist

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    20190506_112349.jpg
     
  14. smokey7

    smokey7 jack of a lot ace of a few

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    The clip couldve be tossed there during the failure
     
  15. rd35

    rd35 Just an average Joe's brother!!

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