Air Rifle

[fishinwrench]

6 hours ago, Ketchup said:

wrench did you not clean the bore/barrel? Thought i knew ya better than that. If so how did it diesel without lube? 

 

Of course.  But the piston chamber just kept pushing more grease out, and even though it was shooting great I was having to clean the barrel every 100 or so shots or else accuracy would start to fall off.    I thought I had gotten it all blown out, but then during a long period of trajectory plotting it went off like a black powder cannon, and after that the accuracy went completely stupid.    I swapped scopes to make sure the hard blast didn't just trash the scope, but nope it was the gun.  The piston seal has a 1/8" wide flat melted spot.  

One of the guys on the AGN board told me that I might have caused it by storing the gun standing up.....which is a possibility I guess.   But IMO if it hadn't been too heavily lubed then storing it standing up wouldn't have hurt anything.  

[snagged in outlet 3]

Two things I thought I would never hear on a fishing forum.  "Blew a seal" and "too heavily lubed"

Boys and their toys..

[fishinwrench]

 

[snagged in outlet 3]

No it was an Eskimo on a snow mobil

[lee G.]

3 hours ago, fishinwrench said:

Of course.  But the piston chamber just kept pushing more grease out, and even though it was shooting great I was having to clean the barrel every 100 or so shots or else accuracy would start to fall off.    I thought I had gotten it all blown out, but then during a long period of trajectory plotting it went off like a black powder cannon, and after that the accuracy went completely stupid.    I swapped scopes to make sure the hard blast didn't just trash the scope, but nope it was the gun.  The piston seal has a 1/8" wide flat melted spot.  

One of the guys on the AGN board told me that I might have caused it by storing the gun standing up.....which is a possibility I guess.   But IMO if it hadn't been too heavily lubed then storing it standing up wouldn't have hurt anything.  

Yeah, I dont see how standing up would have put more lube in the compression chamber.

[fishinwrench]

2 hours ago, lee G. said:

Yeah, I dont see how standing up would have put more lube in the compression chamber.

Apparently it can cause any excess lube to puddle up on the face of the piston seal.     The factory had lube stuffed in there like they were packing wheel bearings 

I'm using this stuff (SPARINGLY) when it goes back together.....

MOLY EP LITHIUM GREASE is a smooth textured high melting point, water resistant lithium base grease fortified with molybdenum disulfide (moly) to reduce wear by maintaining lubrication under conditions of high friction and shock loads.

[jdmidwest]

Dieseling can be caused by normal "petroleum base lube", depending on the heat buildup and combustible material.  Silicone based lubes do not have the ignition problems.  The more you shoot in a session, the more heat builds up, melts lube, then ignites.

[fishinwrench]

11 minutes ago, jdmidwest said:

Dieseling can be caused by normal "petroleum base lube", depending on the heat buildup and combustible material.  Silicone based lubes do not have the ignition problems.  The more you shoot in a session, the more heat builds up, melts lube, then ignites.

I'm blown away that a manufacturer that has been building airguns for YEARS like Crosman/Benjamin have, are, I assume, using the wrong type of lube.  

[jdmidwest]

Does silicone ignite

[Flysmallie]

3 hours ago, jdmidwest said:

Does silicone ignite

Looks like most silicone based lubricants have a flash point starting around 220 C. 428 F. There are ones with a higher flash point but to answer your question it does ignite.