Stihl 066 Ate the intake ring

[thinair]

Has anyone ever had a Stihl 066/660 eat the intake boot ring? See pictures of what I found after the saw locked up.

 

[Funky sawman]

I'm assuming the saw and or parts involved are aftermarket. I seen some of the aftermarket intake rings not fit the boot as well as I'd like to see, and China intake boots that are very soft and could possibly digest a ring

 

[thinair]

When taking the saw apart, the only thing I found to not be OEM was the piston.

 

[Funky sawman]

When taking the saw apart, the only thing I found to not be OEM was the piston.

So this throws a whole new dynamic into the situation. Anything left of the intake ring?

 

[Maintenance Chief]

I dont have one handy but i don't believe the ring can pass through the metal intake port.

 

[Funky sawman]

For OEM saws, I've never heard of this type of failure, and that's after seeing a 038 mag that ate a throttle plate, and a 088 that digested a throttle shaft screw

 

[thinair]

So this throws a whole new dynamic into the situation. Anything left of the intake ring?

I couldn’t find anything left of the ring, but it was missing, so its the only thing i can think of.

 

[Funky sawman]

How long have you had and run the saw? I wonder if it was the wrong size or deformed causing it to dislodge

 

[jacob j.]

Maybe check the bearings very carefully and the carburetor as well - it may have eaten a throttle or choke plate screw.

 

[thinair]

Its my brothers saw, he has had it for awhile now, probably 3 years and used if for firewood every year. The thing has never missed a beat until now….

Carb screws are both still there.

 

[Ketchup]

Crank rod bearing?

I bent an intake ring on a 066 years ago during a pressure test. I bent it back and installed it. Obviously that was a bad idea but it was still there 4 years later when the case cracked and smoked the saw. I could see one getting sucked through but I think it’s very unlikely.

 

[Woodslasher]

When taking the saw apart, the only thing I found to not be OEM was the piston.

What's the rest of the top end look like? I'm kinda-not-really looking for an 066 with a smoked top end to bolt an 056 Mag II jug on, and my vulture instincts are kicking in.