Stihl 034 chipped piston trashed cylinder :-o

[Rokon]

Just tuned this extra 034 I had. Set the low jet, set the high in and out of the wood. Was walking back to the shop with the saw running, rolling the saw left and right as it idles. Doing little throttle blips here and there to make sure off idle jet is perfect. When it starts sounding like marbles on a piece of tin, then dead. Uh oh.

Took the muffler off and found a piece of piston and shavings in there. Below are pictures of the piston and cylinder after tear down.

I think it will buff out after a new piston and rings.....

 

[Mad Professor]

Those dings on top the piston and inside the jug look like they were done with pieces of bearing material.

Look over you lower rod and crank bearings VERY carefully, that rattling sound you heard is the death gasp of a bearing.

 

[windthrown]

Yah, far more likely the low end went, and then took the top end with it.

Is that a huge vertical gouge at the top of the exhaust port there? Sorry to say, but I doubt that would buff out, and it will lead to really low compression.

 

[sefh3]

JB weld her and your good to go. I'm also betting the rod bearing or crank bearings went south.

 

[redunshee]

JB weld her and your good to go. I'm also betting the rod bearing or crank bearings went south.

Scott, I assume your joking, aren't you? Reason I ask is I've seen or heard of so many weird fixes that I'm getting gun shy about assuming anything.
Bob

 

[nstueve]

So what are you planning to do now???

I think she (the 034) was politely asking for a good AM 036 top end and full rebuild... I think Randy has a kit to completely overhaul the saw for $200ish.