Have one, yessir!
MS461 Piston failure diagnosis
- Thread starter JonCraig
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gunnusmc03
Addicted to ArboristSite
Over revving for long periods of time can sometimes lead to ring flutter which weakens the piston and causes the piston to break between the rings.
cuinrearview
Red saw lover
And too lean would let it over rev.
Don't buy your seals and gaskets individually. Order the "set of gaskets". It'll come with everything you need and save you some money.
Your cylinder looks very salvageable, but is going to require some work.
Your cylinder looks very salvageable, but is going to require some work.
I took some goodies off this MS460 that got ran over by a Bobcat today. Youch!
how about that muffler?
how about that muffler?
Gas tank and cylinder ok!
brandonstc6
Addicted to ArboristSite
Maybe not, I had a 460 that looked exactly like that and the pressure put on the muffler was enough to put two large cracks in the exhaust port and you could wiggle the muffler without removing the screws/
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Cylinder was fine. Not even a broken fin, but the tank, both crankcase halves, starter, were all toast.
It was a big Bobcat.
It was a big Bobcat.
Sad end to a good saw, rip 460!
jr27236
Addicted to ArboristSite
Did you get to take that 460 home? Id keep that, there are just so many parts that are salvageable. Id take every screw off that carcass, by the time i was done it would look like the Thanksgiving turkey
Oh yes!
I always strip them down. Them screws cost money. -Not to mention the little parts that will come in handy someday.
I actually had another customers 460 that needed the cylinder & piston from two days prior.
I assume OEM is the only way to go on seals, right?
I'm pricing everything OEM, and it's literally 6x higher price. But I don't want to cut corners. Opinions?
drf255
BAD CAD
Go OEM.
Like Brad said, gasket set will save you $$$
Are those plating chips above and below the ex port, or is that an illusion?
Like Brad said, gasket set will save you $$$
Are those plating chips above and below the ex port, or is that an illusion?
Them screws are expensive.
Combination of illusion and some carbon because of the angle of the pic. Other than the vertical streaks, nothing looks unusual, which surprises me given that there was a 3/4" long piece of piston that had to go somewhere, lol. I'm guessing it went into the muffler & previous owner or a shop pulled the muff and found it. Who knows.
Out the muffler!
Who ever diagnosed it before you looked in there, then nailed the lid on the coffin.
jr27236
Addicted to ArboristSite
He SLAMMED it down first! Lol
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