andrew-theasby
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| posted on 29/4/11 at 10:54 PM |
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Stihl piston repair
Bought a stihl saw at the weekend, took a chance on a non runner that had a spark and seemed to have compression (but doesnt). Ive stripped it down
now to find the top ring has half an inch mising and the bottom ones a bit worn. New rings are only a fiver, but the pin that stops the rings
rotating has worn away, so does this mean i need a new piston too or how can i extract the remains of the pins to replace them? Also the very top of
the bore has a bit of a lip in one place, are these engines pretty forgiving for wear or will it not have any chance of running again? Dont
particularly want to buy a new barrel and piston kit at £40 as i only bought the saw cause it was cheap  and similarly dont want to spend another
£20 on a piston kit if the bores shot as i could get my money back selling it on for spares.
Ideally id like to repair the piston to fit new rings and give it a try and see if anything else needs replacing, is this possible? I cant find a
barrel on its own for sale without the full kit.
Thanks
[Edited on 29/4/11 by andrew-theasby]
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Danozeman
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| posted on 30/4/11 at 06:57 AM |
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Is it the gudgen pin thats worn or the actual piston. Thats what you need to know. Theres normally a circlip at each end of the pin to hold it in.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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big_wasa
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| posted on 30/4/11 at 07:11 AM |
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No there is a little pin in the ring land to stop the ring turning and the ends coming into the ports.
New piston and rings if its not damaged the bore.
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mookaloid
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| posted on 30/4/11 at 08:29 AM |
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Used to do loads of these when I was in the block paving game. It was rarely worth replacing just the piston because it only lasted a couple of days.
just go for the barrel and piston kit - it will be like new then.
"That thing you're thinking - it wont be that."
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MikeRJ
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| posted on 30/4/11 at 09:07 AM |
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If there is a lip at the top of the bore then the top ring will probably get broken again very quickly.
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andrew-theasby
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| posted on 30/4/11 at 02:25 PM |
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Ok thanks for the warning, PS it wasnt the gudgeon pin its the little pegs that hold the rings in place. Might sell it on for spares then.
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