A seal has gone in my FAS, I have a replacement set of silicone seals, Q what lubricants should I use and what to avoid, advice appreciated.
A seal has gone in my FAS, I have a replacement set of silicone seals, Q what lubricants should I use and what to avoid, advice appreciated.
Last edited by silvershooter; 10-06-2011 at 07:36 AM.
Are you quite sure your seals are SILICON? I've never known Silicon seals fitted to any airgun as they aren't usually up to the job, but there's always a first
Replacement seals are usually NBR or Pur (polyurethane)
Just put a little silicon "Oil" between your fingers & rub each seal with it, the seal should only glisten not be wet if you see what I mean, that's enough! Too much lubricant can stop the valve opening properly & will cause inconsistency between shots.
Metal to metal stressed or moving parts can have a small amount of moly grease on them & the felt on the piston (if fitted) can have a tiny amount of light machine oil on it.
The key is....... little is more!
IF IT'S NOT BROKE.........DON'T FIX IT!
Thanks wonky donky, I found them on 'bay http://cgi./FAS-AP604-Air-Pistol-Rep...94606904088095Are you quite sure your seals are SILICON? I've never known Silicon seals fitted to any airgun as they aren't usually up to the job, but there's always a first
The link does not seem to work but a search for FAS AP604 on bay will find the part.
I've ordered 2 sets to see what they are like.
Originally these pistols were fitted with NBR "O" rings of which I have about 30 sets in my workshop. If these "O" rings off the bay do turn out to be Silicon I will test a set but will not put them in someone else's pistol until I have proved them myself over say 12 or 18 months......but that's just me.
IF IT'S NOT BROKE.........DON'T FIX IT!
I came accross this thread today , the poster has given a link to a manufacturer of Nitrile and Vitron O rings : http://www.airgunbbs.com/showthread....t-o-quot-rings
What is NBR ?
(So far the silicone seals fine, after about 50 pellets.)
Last edited by silvershooter; 12-06-2011 at 01:45 PM.
NBR is Nitrile Buna-N.
I am really interested to see how Silicon does stand up. It has poor tensile strength, tear resistance & abrasion resistance.
Viton will do the job as will EPDM but the physical properties & cost make NBR more attractive to manufacturers, as does Pur in certain applications.
IF IT'S NOT BROKE.........DON'T FIX IT!