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Ring locating pin failure

idiotwithasaw

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This is what happens when a locating pin comes loose on a 372 xp xtorq piston. Nice little groove right where you don't want it to be. I got this saw as a parts saw I don't know how long it ran like this or how long it took to do this much damage.IMAG2138.jpg IMAG2141.jpg
 

idiotwithasaw

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I am too. If it had actually came out I'm sure it would have.
 

Definitive Dave

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is this just a fluke manufacturing thing or is there something that the builder or owner did wrong to make it come apart like that?
I haven't seen that in real life ever
Dave
 

Onan18

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I have, manufacturing fluke more than likely. Had one like that the other week on a RedMax weedeater.

Joe
 

d.l.d

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Saw the same thing on an fs45 last spring. I'd also say manufacturing flaw. It came all the way out and wedged its self between the p/c. I thought it was a bent connecting rod at first because ive seen that on those stamped steel rods before. Once i opened it up i saw the rod was fine i had to see why it was seized as the cylinder though the exhaust port looked fine. Once i finally got it free that was the culprit.
 

idiotwithasaw

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It's a pretty deep groove at the very top. It is probably a mm deep and extends half an inch from the top. It also wore the ends if the ring till they were rounded. If I didn't have a OE cylinder that's waiting on a meteor piston I might be tempted to do as you suggested mastermind. If nothing else be interesting to see how well it could possibly run as it is.
 

idiotwithasaw

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The bad thing is I don't wanna have to split the case but I'm not sure I can flush all the fines out of it. What do you guys think. Flush it real good or split it and new bearings?
 

Canadian farm boy

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I'd pull the crank seals and flush the bearings with gas and or brake clean and maybe even some shop air. If after a thorough flushing I wasn't happy I would then split the case. If you dump out the brake clean/gas from the crank case on a clean paper towel you'll be able to see what your flushing out. Keep flushing and dumping onto paper towel till you don't see any more glitter on the paper towels.
 

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Brakekleen will dissolve the paint in the case, not good. I'd use gas personally.
 

idiotwithasaw

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I hate to pull seals, especially if they r still good. I have tried flushing it with kerosene and starting fluid. I also took peices of paper towel and stuffed it in thecrank and rotated it wiping it out inside. I kept doing this and then flushed it more
 

d.l.d

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I hate to pull seals, especially if they r still good. I have tried flushing it with kerosene and starting fluid. I also took peices of paper towel and stuffed it in thecrank and rotated it wiping it out inside. I kept doing this and then flushed it more
Just a suggestion of what i do to get all the fines out. At this point you already have the p/c off, i fill the case with gas and gently chuck a drill on the clutch side of the saw. Holding the connecting rod where the wrist pin is so it can move without banging all over the case. I run the drill forward and reverse then dump tbe gas in a clear container and repeat the process till i see no debris left.
 

idiotwithasaw

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Apparently there is no quote feature. But no there wasn't a whole lot that was visible in the bottom of the crankcase. I wouldn't think there would be a lot. I'm gonna flush it a few more times. Just to be sure.
 
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