MS 461 piston exploded

[Glock37]

Had to get a small diamond wheel cut a groove in spider in the groove placed a chisel and tap it untill i heard it crack then spun right off didnt harm any threads on crank. 1/2 gun with wheel side case removed and crank lopes in vise gun would nut remove spider untill cracked Damn it was tight

Have no idea what damaged piston but cylinder is not damaged



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[psuiewalsh]

Ew

 

[stihl saws]

How'd that happen? That's one of the best destruction pics ever.

 

[smokey7]

So that doling happen on dissembling the saw. It was like that?

 

[KenJax Tree]

Must've been run on Klotz

 

[psuiewalsh]

Nope, kaboom

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[Glock37]

I have no idea the cause just the results

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[Warped5]

Mike, it's a sign.

You need to move over to the orange Kool-Aid table.

 

[Glock37]

Its not my saw its a cust that dropped 4 off to rebuild this is the first of 4 a 066 , 660, 880 i got a 61 to a 272 a 365 sp to 372 and a 395 xp im rebuilding for my self so im teetering lol


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[Chainsaw Jim]

It looks like the piston might have been on backwards. Whatever happened it looks like the bottom ring hung up.

 

[drf256]

Yuk

 

[rattler]

Dang

 

[Glock37]

The cylinder ports look good


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[jacob j.]

There's been some failures with the cylinder coming apart on the 461 as well, similar to the 390XP where the base mounting ears are breaking off. I wonder if it is metallurgy related?

 

[Poleman]

Ya, this seems to be a problem with them. Had a friend that purchases a new saw and 6 months later it did something like this....but not this bad.
It was adjusted at the dealer new and never touched. He took it back to the dealer after the explosion. They disassembled and said it musta been a faulty piston. Stihl wanted to see it so it was sent to them.... Dealer was going to cover it at that time.
Stihls report was saw was over reed 2% of the time and they said they wouldn't warranty it. Dealer backed out than too. Was was never returned and no reimbursement of any kind..he got the ol double wammy.....no replacement as promised by dealer and Stihl USA kept his saw.....
He now run Husqvarna....don't blame him.

 

[Terry Syd]

Is the 461 rev limited? If so, how could the factory claim it was overrevved 2% of the time - after all, it would be a fault of their hardware that led to the overrev.

EDIT: It looks like the fracture started at the back of the ring groove on one side of the piston and finally let go, then tore the other side off. Besides metallurgy, perhaps there is a sharp corner in the back of the groove that localizes the forces.

 

[Poleman]

Just what the dealer told him that Stull said.
I'm thinking they are Terry as it seems every saw is anymore.

 

[Nitehawk55]

Saw been ported ? , gasket delete ??

 

[Glock37]

Not ported. Still had base gasket muffler in tack I got to talk to cust mon


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[Poleman]

My friends saw was all stock..nothing done to it......not even a MM.