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Piston diagnosis

panteliss

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customer returned via ebay
Customer believes manufacturer defect
Stihl ms192t

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Milesrunningman

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Well I have just got in from the garage. I used a Stihl piston stop tool, a 19mm impact socket and a 2ft breaker bar. All on a pattern TS400 piston. The most I could get was a mark on the piston top. Granted the TS400 is a concrete saw and the spark plug hole is straight above the piston. As opposed to offset. However I would have thought the strength of chainsaw and concrete saw components where similar.

I did have the bar cranked so hard I nearly ripped the saw body from the rubber vibration mounts. Still couldn't break the piston. Was tempted to try it with an impact wrench. However running a compressor this late would annoy the neighbours!

Did strike me that if someone used an auto motive bolt with a tapered end as opposed to a blunt end (proper tool). That would mark the same. If the £9 was to expensive for the real tool.

Seems a fair amount of force was used!!!!

Also unless I am missing something? If the piston failed under use why is there no carbon marking on the piston. Or was the really annoyed customer so mad he cleaned it before sending it back.

Anyway that my tuppence worth :-)

Will update if I can kill the piston with an impact breaker.
 

dall

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Well I have just got in from the garage. I used a Stihl piston stop tool, a 19mm impact socket and a 2ft breaker bar. All on a pattern TS400 piston. The most I could get was a mark on the piston top. Granted the TS400 is a concrete saw and the spark plug hole is straight above the piston. As opposed to offset. However I would have thought the strength of chainsaw and concrete saw components where similar.

I did have the bar cranked so hard I nearly ripped the saw body from the rubber vibration mounts. Still couldn't break the piston. Was tempted to try it with an impact wrench. However running a compressor this late would annoy the neighbours!

Did strike me that if someone used an auto motive bolt with a tapered end as opposed to a blunt end (proper tool). That would mark the same. If the £9 was to expensive for the real tool.

Seems a fair amount of force was used!!!!

Also unless I am missing something? If the piston failed under use why is there no carbon marking on the piston. Or was the really annoyed customer so mad he cleaned it before sending it back.

Anyway that my tuppence worth :)

Will update if I can kill the piston with an impact breaker.

try a impact if you have one
 

Definitive Dave

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he hasn't messaged back to take me up on my offer of a replacement
I always try to give somebody the benefit of the doubt especially when our relationship begins with them handing me money.
I'm a cynical bastard but maybe he really didn't know he broke it during assembly?
Dave
 

RIDE-RED 350r

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It's great that you take that approach Dave, but in this case I believe 100% that there is no doubt to be given as benefit....

Here's what I think really happened: Buyer assembled his saw, used the piston stop to facilitate using an impact to install the clutch. This is when/how the piston was damaged, only he doesn't realize it yet. He then tries to fire up his newly overhauled saw and of course it doesn't even try to pop. He then runs a compression check and figures out compression is way low. Pulls the top end and finds the damaged piston, has his headslap moment and then starts taking pics and typing his message to you accusing you of selling him a defective piston. He knows damn well what happened.
 

fordf150

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Or was the really annoyed customer so mad he cleaned it before sending it back.

I had someone return a carb....clean as a whistle but with gas stains inside the box and one little droplet still in the primer bulb, i assume they disassembled the carb before returning it to me for it to be that dry because he later admitted to installing and running his trimmer with it but that didnt fix the problem so he returned it, ebay sided with him and gave him a refund :mad:. Never rule out the amount of work a cheapskate will do to save $25
 

Lightning Performance

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customer returned via ebay
Customer believes manufacturer defect
Stihl ms192t

What say you?
That person is an *a-hole! I have no time to read threads today. You should send it back to that person special delivery via his front window in the living room.

SD Jones :-)
 
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