Is this cylinder beat?
- Thread starter chevybob
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DexterDay
Addicted to ArboristSite
Being linear with the cylinder? Some would use it. Because the ring won't catch it. Other will say to trash it.
What happened? A ring retaining pin let go? Or ring broke?
What happened? A ring retaining pin let go? Or ring broke?
If its for you, I would run it. You wont loose much compression.
Adirondackstihl
Flyz, Fuel & Fotos
Ya I took some 2000 grit to it and cleaned it up nice there wasn't any scratches or serious glazing. The walls look like a mirror which is good in my book. Ya I assume a ring pin let go cus I didn't see it when I pulled the jug off.
Adirondackstihl
Flyz, Fuel & Fotos
400-600 grit
nmurph
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It won't hurt a thing.
The compression will build over time as the groove fills with carbon. This might be a good case for dino oil as opposed to synthetic.
The compression will build over time as the groove fills with carbon. This might be a good case for dino oil as opposed to synthetic.
jughead500
Sasquatch
Yeap Run it.If it finishes getting trashed what have you Lost? Nothing Just Gained some extra use.
Would this be to leave honing marks (@45°) to help trap oil? Read that you don't want a mirror finish for this reason. Just tryin to learn.
Adirondackstihl
Flyz, Fuel & Fotos
Yes
Will help rings seat faster as well
Yep- I took apart a good running stock 394 a couple months ago because the main bearings were shot. The cylinder had a nice score mark from one upper transfer all the way to the squish band.
The owner had cleaned up the jug and put a new OEM piston and rings in it and ran it for years. Now you can hardly even feel the score mark. I wouldn't put it on a customer's saw but I'd happily
run it on one of my own.
SawTroll
Information Collector
nmurph
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I don't really see any damage at al - am I getting blind?
Must be!! I bet your Mother warned you about doing that when you were alone!!!
Yes, there's single score from the top of the exhuast to the top of the cylinder. It looks to be pretty deep, but it also looks to be narrow and the only one.
Lol. Either that or yer readin too much as per yer avatar. Sure that isnt actually a picture book? I see a straight dark line but wondered whether it passed the finger nail test I keep hearin about.
nmurph
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The "Nail Test" only pertains to metal standing proud. Scoring is evaluated differently- location, number, depth, etc...
Is it me or does it look cracked or just camera reflection?
could it be bad casting or stress cracks??
could it be bad casting or stress cracks??
Thanks! That's worth months of future learnin, at least. Probly more. As long as we're speculating, might there not be two other lines adjacent (going ccw), and might not that entire area already be fillin in with carbon depositing?
SawTroll
Information Collector
OK - I saw it all the time then - but "misread" it, thinking it was a string of metal pointing at the suspect area.....
Must be the camera I took a close look and there doesn't seem to be any cracking at all.
