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084 piston rings end gap?

Started by 421Altered, October 27, 2020, 09:20:14 PM

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421Altered

 I just put my 084 together a couple days ago.  I used the Stihl manual for information.  I put new Caber rings on the oem piston.  I didn't check ring end gap, I just installed them.  Finished assembly of saw and fired it up without a bar, and ran it for about 10 minutes at varying rpms, up to maybe 5000 max.  It didn't cross my mind to check ring end gap. The Stihl manual didn't even mention ring end gap.  Should I take saw apart and check them?  

realzed

Well I would assume (you know how that works) that if the rings were actually too tight you would well know about it by now by how hard the piston with new rings on it went back into the bore, as well as how long it ran before it got sufficiently warm and locked up if they were tight  :)..
As for possibly being too loose - if the saw felt like it had good compression and started up well initially, and isn't having a lot of blow-by or smoke pouring out of the exhaust - you probably are good to go!
Not very scientific I know - but just my own general 'shade tree' take on it!




Real1shepherd

If you noodle around on Google, you'll find a formula for ring end gap and small engines.

I use Caber exclusively and never had to shave off ring ends. I think you're probably OK, but I don't work on Squeals.

Kevin

421Altered

Thanks Real for the info that you never have had to file your ring ends on Caber's.  I'm no expert, but, I don't believe that a Stihl knows it's not another brand!!  So, my Stihl should be fine just like any other brand, because after all, heat expansion is heat expansion!!

Al_Smith

The only engines I've ever gapped the rings on were 60 -70 year old tractor rings .As far as Caber rings I've never had a problem with them .

421Altered

Thanks Al, that's what I needed to hear!

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