GTA

Airguns by Make and Model => Crosman Airguns => Topic started by: Frank in Fairfield on April 19, 2014, 01:16:23 PM

Title: Watch the Oil
Post by: Frank in Fairfield on April 19, 2014, 01:16:23 PM
Over on another forum, a user apparently rebuilt a pump-up air gun.
He stated he oiled it and then pumped it (a lot).
Boom!
He used ATF fluid thinking it was not flammable.
Not!
My C9A gets oil on the metal, moving parts and the bolt o-ring.
No oil on the felt washer.
Please be careful.
 ;)
Title: Re: Watch the Oil
Post by: plinker331 on April 19, 2014, 08:24:08 PM
Thank you for that reminder  ;D
Title: Re: Watch the Oil
Post by: BillK on April 21, 2014, 03:11:05 PM
After reading the post & seeing the pics the valve itself seems to be what failed.  The valve walls were weakened by removal of material to make the volume larger.  Too thin walls + too much pressure = BOOM.
Oil does not seem to be the cause.
Title: Re: Watch the Oil
Post by: amb5500c on April 21, 2014, 03:14:35 PM
But oil MOST DEFINITELY CAN be the cause of catastrophic failure.
Richard
Title: Re: Watch the Oil
Post by: Big Bore Bart on April 21, 2014, 03:37:31 PM
  How about a link please? ;) ::)   I haven't seen it on the usual forums. :D
Title: Re: Watch the Oil
Post by: D14Jeff on April 21, 2014, 04:46:28 PM
Quote from: Big Bore Bart on April 21, 2014, 03:37:31 PM
  How about a link please? ;) ::)   I haven't seen it on the usual forums. :D

http://www.crosman-air-pistol-owners-forum.com/board/index.php/topic,13908.0.html (http://www.crosman-air-pistol-owners-forum.com/board/index.php/topic,13908.0.html)
Title: Re: Watch the Oil
Post by: K.O. on April 21, 2014, 10:26:09 PM
I take my valves nose i.d. just  to .4 from .36 and take two threads IMO more than that and yep kablam...

I am aware even that may be pushing it... Heck there is 1000-1500 psi in there :o
Title: Re: Watch the Oil
Post by: breakfastchef on April 21, 2014, 10:37:45 PM
Yes, indeed. This situation was caused by a combination of an aggressive valve modification and subjecting the 13xx gun to extreme stresses. Oil had little to nothing to do with the cause of the failure.


 
Quote from: BillK on April 21, 2014, 03:11:05 PM
After reading the post & seeing the pics the valve itself seems to be what failed.  The valve walls were weakened by removal of material to make the volume larger.  Too thin walls + too much pressure = BOOM.
Oil does not seem to be the cause.
Title: Re: Watch the Oil
Post by: wilsonj1018 on April 21, 2014, 10:40:09 PM
ive had oil explode in a pumper, it can and will happen, blows the pump arm back open with incredible force.
Josh