What happened?! Piston 044

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Stihl95

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Hi everybody, so Recently I rebuild a Stihl 044. I put new bearing, new piston with rings, and a new cylinder into this saw. The only thing I reused was the crank.. so after about a week of cutting with this saw it totally grenades on me. After taking the saw apart again I noticed the crank was totally shot.. I’m wondering if the crank giving out caused this damage orrr if the damaged cause the crank to go out. Maybe there was to much compression after adding the new piston with rings? I could use some help lol thanks
 

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Possibly lower bearing failure got metal into the transfers and on top of the piston. What broke in the bottom end? What oil mix did you use?

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Possibly lower bearing failure got metal into the transfers and on top of the piston. What broke in the bottom end? What oil mix did you use?

Sent from my LM-G820 using Tapatalk

The rod is loose and has a bunch of play. I use the Stihl High Performance Ultra 2 Cycle.


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So big end bearing failure, could have been something that was going to happen, could have been some debris from the rebuild, hard to tell.

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So big end bearing failure, could have been something that was going to happen, could have been some debris from the rebuild, hard to tell.

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Oh bugga thanks! I know I do a pretty good job of keeping stuff clean while I building but anything could have happened. Thanks for the help!


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Oh bugga thanks! I know I do a pretty good job of keeping stuff clean while I building but anything could have happened. Thanks for the help!


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Is the case okay?

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It did some damage but I managed to clean it up with some some scotch brite. Nothing to bad. Is that something I should look out for in the future?


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It did some damage but I managed to clean it up with some some scotch brite. Nothing to bad. Is that something I should look out for in the future?


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Yeah when the bearings come apart they get between the case and crank and can blow out the case

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