I noticed a problem with my ported 044...

[PA Dan]

The metal bent but with resistance.

 

[tree monkey]

I think I know why randy's balls hurt

 

[cgraham1]

Nope, aint taking that deal. What I said was put a price on it damnit and free ain't a FAIR price

Can't give a friend a chuck of scrap metal?

I'll take it for free. Screw that other Randy, Randy.

 

[Yukon Stihl]

The metal bent but with resistance.

Looks like half of a small cotter pin.Curved on one side flat on the other

 

[Moparmyway]

I rebuilt this 044 sometime last winter. The case got split and new bearings were installed. I can't remember what all I replaced but it was a lot. I ran a couple tanks through it and then sent it to Tennessee. Since it's return I might have 8-10 tanks through it. I last used it in December when I cut up a huge oak tree that fell in someone's yard. A couple weeks ago I pulled some mufflers off my saws to get them powder coated. When I went to reinstall the other day something didn't look right! I have asked around a little and have some ideas on the issue. Anyone care to take a guess? If I have already asked you personally wait a while before you post your guess. I'll be digging into it later today.

So it wasn't a circlip or the wrist pin bearing...

How about the intake side of the piston...

Never saw a problem running. Saw was running fine and was warmed up before it got in the wood. I ran three saws that day and went through nearly two gallons of mix. Checked the other two and they are fine.

found this in the crankcase?

Considering the steps I take when beveling a port.......that thing had to have ate something....somehow......someway.

I'll fix it.......but I know my port wasn't left rough enough to cause that.

I'd love to see the piston crown, up close.
I could see the carbon (evidenced by piston in exhaust port picture) wedged the piston, it tilted the piston. Look at the pebbling in the ring lands of the piston at the exhaust port. Looks like carbon tracking.

Sliver is nikasil when the piston leaned away from the carbon at the exhaust port, it galled the intake port and piston skirt, possibly shearing off nikasil ..........

Even if it aint nikasil,

I'd love to see that piston top with more light on it, and the ring lands exhaust port area of the piston

 

[Definitive Dave]

What caused this?

View attachment 8494

Leaking flippy cap?

Maybe a sliver of solder got pinched off while checking final assembled squish?
But that would probably be all melts and stuffs after 8-10 tanks

 

[drf256]

Foreign debris made it down into the case, or eminated there.

Peeled bearing race or cage.

Of something was just there from prior to assembly and finally floated loose. Coulda made its way in and not been seen. Unless there was prior damage to the saw, I don't flush a case clean. I do hit it with some light oil and wipe it out by rotating a paper towel through it in both directions.

Whole thing makes little sense.

What's the inside of the crankcase look like? Sides of bearings?

I think it's narrowed down to foreign debris. It's malleable and ductile, so I'm thinking it ain't Nikasil. It's steel.

 

[Ironworker]

Do any of you builders blow the case out before you reassemble a saw, I often think of doing this but always forget.

 

[Marshy]

What caused this?

View attachment 8494

Someone posted a Failure Analysis report by Stihl somewhere on the forum. I read it and thought cool, it might give you some ideas orbit might not. If you haven't looked through it I recommend it, its a good read.

 

[Definitive Dave]

http://opeforum.com/threads/illustrated-stihl-engine-failure-analysis-guide.899/

for your reading pleasure

 

[Redfin]

Dan have you taken a real good look at the big bearing on the crank?

 

[PA Dan]

Dan have you taken a real good look at the big bearing on the crank?

Ya I have spun it around to every angle I can get and it looks good!

 

[PA Dan]

I'd love to see the piston crown, up close.
I could see the carbon (evidenced by piston in exhaust port picture) wedged the piston, it tilted the piston. Look at the pebbling in the ring lands of the piston at the exhaust port. Looks like carbon tracking.

Sliver is nikasil when the piston leaned away from the carbon at the exhaust port, it galled the intake port and piston skirt, possibly shearing off nikasil ..........

Even if it aint nikasil,

I'd love to see that piston top with more light on it, and the ring lands exhaust port area of the piston

 

[Moparmyway]

Carbon scraping for $1000

 

[Mastermind]

When is it going in a box Dan?

 

[Motorhead]

oil seal spring?

 

[Mastermind]

Not enough run time for carbon....

 

[huskihl]

Is there a carbon layer in the muffler that broke off and got sucked in?

Edit* Randy beat me to it

 

[Redfin]

That sliver you found in the case was prolly a piece from the piston.

 

[Mastermind]

Oil seal driven too deeply?

Edge rubbed off by the bearing?