Guess the noise

[Deets066]

Starter pawls?

I’m not fully convinced

 

[jacob j.]

Piston slap?

Either that a lot of blow-by.

 

[Fruecrue]

Piston slap is my guess - we had a few old landing saws come through the shop making a similar sound.

Piston slap?

Well done fellas!

 

[Fruecrue]

 

[Fruecrue]

Last pic shows top front of piston peened up and in.
Hard to photograph.

 

[jacob j.]

Last pic shows top front of piston peened up and in.
Hard to photograph.

Yeah that lip is indicative of a lot of wear...someone got their money's worth out of that piston.

 

[Fruecrue]

Yeah that lip is indicative of a lot of wear...someone got their money's worth out of that piston.

Not me unfortunately.
I’ll probably be looking for a 272 top end.
Cylinder was ground on at one point, and shows serious wear.

 

[jacob j.]

That looks a lot like a few used saws I've picked up here. I bought a 266SE at a garage sale last year for $50. Intake port had identical wear to yours and similar grinding (mine was less symmetrical though).

 

[Fruecrue]

Pretty amazing really that is still ran.
Crank spins free like the seals aren’t even there and I can hear he flywheel side suck air when spun by hand.

 

[Dub11]

Put a hyway slug in it with some cabers just to see how well the potted cylinder runs

 

[Chainsaw Jim]

Was the base gasket removed? I've heard that kind of loud rattle after a high hour cylinder with a lip worn at tdc from the ring edge, then had the base gasket removed which let the ring tap over that lip edge on every up stroke.
I think I can still hear it while revving and cutting but who knows.
With piston slap that loud I have to wonder how the skirt can hold up with that kind of force, for that length of time, without either aluminum transfer shutting things down or grenading.

 

[ken morgan]

Was the base gasket removed? I've heard that kind of loud rattle after a high hour cylinder with a lip worn at tdc from the ring edge, then had the base gasket removed which let the ring tap over that lip edge on every up stroke.
I think I can still hear it while revving and cutting but who knows.
With piston slap that loud I have to wonder how the skirt can hold up with that kind of force, for that length of time, without either aluminum transfer shutting things down or grenading.

had to be close either way would be my guess...

 

[Steve Taylor]

Sounds like my 372 I have torn down for the same reason.

 

[Fruecrue]

Was the base gasket removed? I've heard that kind of loud rattle after a high hour cylinder with a lip worn at tdc from the ring edge, then had the base gasket removed which let the ring tap over that lip edge on every up stroke.
I think I can still hear it while revving and cutting but who knows.
With piston slap that loud I have to wonder how the skirt can hold up with that kind of force, for that length of time, without either aluminum transfer shutting things down or grenading.

Gasket was still there.

 

[Adirondackstihl]

I already knowed the anser

 

[jakethesnake]

Will a worm cylinder accept new piston an be alright for many hours or just no?

 

[Deets066]

Will a worm cylinder accept new piston an be alright for many hours or just no?

It will run... until it won’t

 

[jakethesnake]

Figured lol

It will run... until it won’t

 

[jakethesnake]

Never figured on a plated cylinder wearing much

 

[Deets066]

Never figured on a plated cylinder wearing much

They do, usually lack of air filtration. Lot of hours with a clapped out filter will take the plateing off the intake side

 

[Chainsaw Jim]

... and cutting dirty wood. Dust from dirt will eat through plating in a hurry.