Watch the Oil

[Frank in Fairfield]

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.
 

[plinker331]

Thank you for that reminder 

[BillK]

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.

[amb5500c]

But oil MOST DEFINITELY CAN be the cause of catastrophic failure.
Richard

[Big Bore Bart]

  How about a link please?    I haven't seen it on the usual forums.

[D14Jeff]

  How about a link please?    I haven't seen it on the usual forums.

http://www.crosman-air-pistol-owners-forum.com/board/index.php/topic,13908.0.html

[K.O.]

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

[breakfastchef]

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.


 

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.

[wilsonj1018]

ive had oil explode in a pumper, it can and will happen, blows the pump arm back open with incredible force.
Josh