Farkin BOOOM

[srcarr52]

One end of the wrist pin looks like it was exposed and did some plowing. That's one good way to get the leverage needed to bend the rod like that. I'm guessing the clip was damaged or not installed properly when the base gasket delete was performed.

It does look like the pin plowed the transfer bridge out but it's hard to say if that is pre or post piston exploding. I see a clip in the piece of piston that broke out intact, other side is likely in many pieces. A mystery this one is.

 

[Wilhelm]

Now I have a theory of what may have transpired here, but I'll open it up for discussion. Begin !

It's a Stihl?!

Looks messy.
Did the case get damaged?

 

[Chainsaw Jim]

It does look like the pin plowed the transfer bridge out but it's hard to say if that is pre or post piston exploding. I see a clip in the piece of piston that broke out intact, other side is likely in many pieces. A mystery this one is.

Mystery it is..
It's some serious wreckage and I'm expecting him to sift through the debris to find a blackbox.

 

[srcarr52]

Mystery it is..
It's some serious wreckage and I'm expecting him to sift through the debris to find a blackbox.

I doesn't get much more destructive than that unless the rod breaks and stabs through the case.

 

[redtractor]

A hammer fixes all.

 

[huskihl]

If you can't fix it with a hammer you have an electrical problem mate.

More sig material. Been a fair amount of it around here lately

 

[stihl saws]

Those are some of the best breakage pics I've ever seen. Very sorry for your loss.

 

[Time's Standing Stihl]

Man oh man, that's nasty!

Sent from my SM-G900R4 using Tapatalk

 

[67L36Driver]

Crank assembly is right around $320 for a MS880.

 

[rogue60]

Thinking about this I remember reading Vince saying something about sheared off the flywheel key I think that might of been 1st sign all was not good ,from what I read sounded like the saw may have locked up momentarily and sheared the key?.. I'd say that was from a lost c clip the gudgeon pin moving over and hooking in the port, few days later he fix the key got the saw going again but this time with more revs pin moved over into the port again and booom!.. Just thinking out loud.
Can honestly say I've never seen so much destruction must of made hell of a noise!

 

[drf256]

That's some serious carnage. My bet is head slapper because of carbon.

 

[VinceGU05]

I am FARKIN glad I never bought it of you!

Ouch!!!!

You should be able to put a shifter on that rod and straiten it out?

I will give you $50 posted for it

gee thanks for the vote of confidence! I'll make sure i never have any dealings with you with that sorta attitude.
its clearly a mechanical issue due to the c clip popping out or even me forgetting to put one in!

had you bought it i would have put a tank thru it first and this would have still happened to me. at the time of death, this saw had a total of 1 or 2 minutes run time since the rebuild.
as i said, clearly i have *f-worded up!
I live by the word and practices of Randy. anything out of the norm that goes kaput, send it back and i will make right or full refund.
as to the $50.. use it to wipe your arse.

 

[VinceGU05]

Thinking about this I remember reading Vince saying something about sheared off the flywheel key I think that might of been 1st sign all was not good ,from what I read sounded like the saw may have locked up momentarily and sheared the key?.. I'd say that was from a lost c clip the gudgeon pin moving over and hooking in the port, few days later he fix the key got the saw going again but this time with more revs pin moved over into the port again and booom!.. Just thinking out loud.
Can honestly say I've never seen so much destruction must of made hell of a noise!

this time i used the piston stopper and did the flywheel up with a ratchet spanner and got it a lot tighter than just a quick blip with the rattle gun and no stopper.

so far i haven't found this missing C clip. 50/50 chance i forgot to install it but cant imagine that, but anything is possible.

moments b4 the death i tipped the saw over on the recoil side while running. i would say that's when the wrist pin went walkies.

live and learn.. will change my practices in the future and not be so blazay about it all.. especially on saws of this caliber.

the cylinder was still nice and tight and well sealed to the case. no problem there.

 

[KiwiBro (deleted)]

Great pics Vince.

 

[skip sail]

Great forensics ( CSI,history cold case time team etc) and excellent serve
Just came in from running the 084 you rebuilt for me, its a ripsnorting monster,and ran like a top.
My thoughts on the culprit- A Dingo ate your C-clip

 

[KiwiBro (deleted)]

gee thanks for the vote of confidence! I'll make sure i never have any dealings with you with that sorta attitude.
its clearly a mechanical issue due to the c clip popping out or even my forgetting to put one in!

had you bought it i would have put a tank thru it first and this would have still happened to me. at the time of death, this saw had a total of 1 or 2 minutes run time since the rebuild.
as i said clearly i have frenchied up!
I live by the word and practices of Randy. anything out of the norm that goes kaput, send it back and i will make right or full refund.
as to the $50.. use it to wipe your arse.

I've got $10 that says brewz didn't have malicious intent, rather just a poor choice of words.

 

[jake wells]

turning into AS all over again..........

 

[rogue60]

this time i used the piston stopper and did the flywheel up with a ratchet spanner and got it a lot tighter than just a quick blip with the rattle gun and no stopper.

so far i haven't found this missing C clip. 50/50 chance i forgot to install it but cant imagine that, but anything is possible.

moments b4 the death i tipped the saw over on the recoil side while running. i would say that's when the wrist pin went walkies.

live and learn.. will change my practices in the future and not be so blazay about it all.. especially on saws of this caliber.

the cylinder was still nice and tight and well sealed to the case. no problem there.

I'm carp with the written word as well when I said lost c clip I ment piston lost it as in worked loose and fell out, was just trying to help work out what happened and get to the bottom of it..hope I wasn't taken as being malicious in anyway.. You do fine work on saws Vince don't let this set you back one of the best practices you can do as a mechanic is get to the bottom of a engine failure builds your knowledge tenfold.

 

[Iron.and.bark]

My thoughts on the culprit- A Dingo ate your C-clip

Chamberlain 084...

 

[67L36Driver]

As an aside:
Nothing is worse than finding an extra piston pin retainer in the bench after you've done a top end swap.

"Did I or didn't I???[emoji848]