Thoughts on this one... MS440

[Jimmy in NC]

I recently put a new tank on this saw (month or two ago) and it lives on the side of a chip truck. High mileage MS440. He was happy when he got it back lov9ng the fact it had new AV's, new intake, new impulse, etc. Tune didn't move and was spot on after repairs. It came back yesterday claiming low power, fuel pouring out, not usable.

This is what I found in a 10 minute diagnosis...

Time to vac test it and go from there I guess... thoughts on the piston damage? Crown pretty beat up.

 

[stihl_head1982]

Was it carbon? Hard for me to tell but my eyes are old.

 

[dall]

that is ugly ill take it lol

 

[TJ the Chainsaw Mechanic]

Smoked saw for Christmas anyone?

Discoloration looks like old gas from here.

 

[dall]

tree services are hard on saws and usually the saws get abused id say bad gas as well

 

[Motorhead]

Looks like the crank seal on the oil pump side gave out and it's been burning bar oil for a while.

 

[bikemike]

I recently put a new tank on this saw (month or two ago) and it lives on the side of a chip truck. High mileage MS440. He was happy when he got it back lov9ng the fact it had new AV's, new intake, new impulse, etc. Tune didn't move and was spot on after repairs. It came back yesterday claiming low power, fuel pouring out, not usable.

This is what I found in a 10 minute diagnosis...

Time to vac test it and go from there I guess... thoughts on the piston damage? Crown pretty beat up.

Before I read anymore I'd say bad fuel or water in the fuel, too much oil not enough fuel delivery, and the filter I have seen worse and it is a compensater carb. Big exhaust leak maybe no screen and something fell into exhaust and stayed there for a bit

 

[sawmikaze]

tree services are hard on saws and usually the saws get abused id say bad gas as well

The ones we use aint bad...

But they aint babied either..

 

[Four Paws]

Looks like a dull azz chain. Fine sawdust everywhere, gets sucked through filter, burned and increases carbon deposits.

 

[Jimmy in NC]

Looks like the crank seal on the oil pump side gave out and it's been burning bar oil for a while.

Was also complaining about oiler not being 100%.

 

[cus_deluxe]

Is it just an illusion, or is there a tremendous amount of buildup in that exhaust port? that piston is a keeper

 

[Motorhead]

Was also complaining about oiler not being 100%.

Looks like it was oiling the inside of that cylinder pretty good

 

[weedkilla]

It constantly amazes me how long people will keep running a saw that is "a bit off".

 

[tree monkey]

if it runs use it, right?

 

[jmssaws]

if it runs use it, right?

No no,if you use them they get dirty.

 

[cgraham1]

No no,if you use them they get dirty.

That's a depressing thought. Best to just keep em on the shelf.

 

[Adirondackstihl]

Looks like the crank seal on the oil pump side gave out and it's been burning bar oil for a while.

Can't see that happening.
Even without a seal, the pto isn't exposed to open sources of bar oil

 

[dall]

What about the case gasket leaking sucking oil and air from oil tank

 

[junkman]

Crush it.

 

[drf256]

That muffler is dry with debris in it.

? Straight gassed after years of use?