ArboristSite.com Sponsors
Gold Clip Capital
Traverse Creek Inc


New O-Rings for Flippy Caps

TheTone

TheTone

ArboristSite Guru
Joined
Jan 31, 2017
Messages
857
Location
Jonesboro, AR
I was getting ready to start a rebuilt saw, so I poured in a little mix, put the old flippy cap on and turned the saw right side up. There was a dribble of mix coming out of the bottom of the cap. I took off the O-ring and slipped on a new one that I had bought on Ebay and no leak. Here's what they looked like side-by-side:
20191005_181100.jpg 20191005_181224.jpg
The readings on the calipers are where the rings fell off. Four mm difference in inner diameter. The old ring was 3.3mm thick, the new one 3.5mm.
The old ring also had grooves worn into it.
20191005_181405.jpg
The lot of 50 Buna rubber O-rings of the specified size for Stihl fuel caps (3.5mm x 25mm I.D.) came to $0.21 each, shipped. Worth a try for those leaky flippy caps that look OK otherwise. Might want to carry a few with you into the woods.
 
MontanaResident

MontanaResident

A Stihl Fanatic
Joined
Apr 28, 2014
Messages
4,238
Location
N. W. Montana
So what you are saying is that O'Rings don't last forever?

I have found that soaking the entire flippy-cap in a solvent goes a long ways in keeping them working properly.
 
  • Like
Reactions: svk
Cycledude

Cycledude

ArboristSite Operative
Joined
Nov 24, 2015
Messages
420
Location
Rib lake wi
Glad you got it fixed, Flippy caps are mostly just an extra place for trouble ! Stihl loves selling them. As far as I know there is no other chainsaw manufacturer using such a foolishly complicated gas cap.
 
  • Like
Reactions: svk

svk

Saw Hoarder
Joined
Oct 19, 2009
Messages
26,886
Location
MN
My friend’s 211 had the same thing, the o-ring on the oil cap was all cracked up. I bought two sizes and the smaller one worked great.
 
Patrick62

Patrick62

Addicted to ArboristSite
Joined
Jun 13, 2005
Messages
2,274
Location
Colorado
perhaps the fuel degrades the O rings some?
However, I have seen just as many leaks on the bar oil cap....

Keep them clean. I really have not had many troubles, but you are on something.. I should stock the O rings !
 
  • Like
Reactions: svk

svk

Saw Hoarder
Joined
Oct 19, 2009
Messages
26,886
Location
MN
perhaps the fuel degrades the O rings some?
However, I have seen just as many leaks on the bar oil cap....

Keep them clean. I really have not had many troubles, but you are on something.. I should stock the O rings !
I was quite surprised that my friend's oil o-ring went first. To my knowledge the original fuel ring is still in there 2.5 years later.
 
Top