Piston Carnage

[gmax]

This P/C is off a Stihl 034, more damage than I was expecting :msp_ohmy:.
I will use a aftermarket 036 P/C if it will fit?

 

[50blues]

ouch that hurt. The 036 will fit. here's a thread to verify. http://www.arboristsite.com/chainsaw/56561.htm

 

[Jacob J.]

What came apart in that one (besides the piston?)

 

[synness4]

looks like the piece of ring beat the crap out of the top of the piston

 

[gmax]

ouch that hurt. The 036 will fit. here's a thread to verify. http://www.arboristsite.com/chainsaw/56561.htm

Thanks for the link

What came apart in that one (besides the piston?)

Nothing else, It wasn't seized no metal bits in the bottom end, luckily all the metal bits ended up in the top of the cylinder.

 

[phillipmc]

That looks nasty.. From the looks of it, either some chrome plating broke lose (least likely). ring broke (more likely) or cir clip (most likely) Then again a screw from 1 of the carb butterfly's could of worked lose and sucked into the engine. That is my guesses

 

[gmax]

The cir-clips are fine, I think it was a broken piston ring that was the culprit, It could have been a lot worse at least the bottom end is good.

 

[splitpost]

looks like the ring end broke at the locator pin,perhaps not enough end gap

 

[Dan_IN_MN]

WoW!

That baby got hot enough to smooth out the damage and flow the aluminum of the piston! It's almost like a 'hot spot' on the top of a piston!

How much of the end of that ring is missing?!

 

[gmax]

That baby got hot enough to smooth out the damage and flow the aluminum of the piston! It's almost like a 'hot spot' on the top of a piston!

How much of the end of that ring is missing?!

About 1/2", another one to add to the project list

 

[Nardoo]

Ouch!

 

[carym2a]

J.B. Weld , sand and fit, good to 10,000 rpms once again

 

[Mad Professor]

You better hope none of that crap is living in the bottom end.

 

[gmax]

The Stihl 034 is running again with a aftermarket 036 P/C fitted

A couple things I noticed,

It wont start or even pop if I use the decomp valve, but it starts easy without using it.
The crank end is slightly bent sprocket side, over tightning a hot chain I suspect, the bearing and seal are still good.

 

[Nardoo]

Good work Wayne, they are great saw. You are going to love using it.

Al.

 

[chrisoppie]

Looks good man! How's she running?
I should have taken a picture of this 372 that came in to the shop that the customer put a xp pistion in a xpw cylinder, broke a 1" crown off the piston top from the ring up. Must have been some slapping going on in there!

 

[gmax]

Good work Wayne, they are great saw. You are going to love using it.

Al.

Thanks Al

Looks good man! How's she running?
I should have taken a picture of this 372 that came in to the shop that the customer put a xp pistion in a xpw cylinder, broke a 1" crown off the piston top from the ring up. Must have been some slapping going on in there!

It's running pretty good, I expect it will run even better after a few tanks of fuel.

 

[roostersgt]

Great job on the rebuild. Excellent pictures. Thanks for taking the time and effort to share.

 

[gmax]

I swapped the piston rings for Caber ones, the compression went from 130 to 148 also gave it a muffler mod.