General Category > PCP, C02, and Helium Powered Airguns

Need info on why my QB78 suddenly developed a bad Co2 leak.

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nervoustrigger:
That's right.  Automotive dielectric grease is a perfect inexpensive and readily-available silicone grease for lubricating O-rings.  The same properties that prevent it from igniting in the presence of a spark from a faulty ignition wire or intermittent light bulb connection, it's just as useful for high pressure air.

Most auto parts stores and hardware stores carry Permatex #22058.  I'm nearing the end of a $6 tube after rebuilding a few hundred PCP and CO2 rifles.

https://www.amazon.com/Permatex-22058-Dielectric-Tune-Up-Grease/dp/B000AL8VD2

Alan:
Here: https://smile.amazon.com/Mission-Automotive-Dielectric-Silicone-Waterproof/dp/B016E5E59G/ref=sr_1_2_sspa?dchild=1&keywords=silicon+grease&qid=1621547132&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExUUNEWU5HNjQ4N0pFJmVuY3J5cHRlZElkPUEwNjM3NzY2MUdETzhWWDRBNTZSNCZlbmNyeXB0ZWRBZElkPUEwNDkyMTYyMzQ3MFNLMzlEV0dRUyZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

Should last a life time!

22_boomer:
I finished up all the gas in the rifle with the 70D urethane Co2 seal and decided to go back to the 90D since the pressure seemed to stretch the 70D O-ring but not swell it. Problem is I need to get the stuff all back together or I'll ether loose something or forget where I put the cap. I know the 90D O-ring won't cause me trouble since I've already tried it and I put some silicone O-ring grease on it this time. For some reason I had a nice long shooting season and didn't fade out and used up a whole cartridge. Since the rifle is zeroed I went to a small swinging target I made. The target area is the size of something like a postage stamp and I use the little stick-on red squares that come with the full targets. When I've shot off most of the stick-on I try for the little pieces that are left. near the end, as the pressure started to drop I could use the dots on the cross-hairs. This has turned out to be a lot of fun and I thank you all for your help.








steveoh:

--- Quote from: 22_boomer on May 22, 2021, 08:26:02 AM ---I finished up all the gas in the rifle with the 70D urethane Co2 seal and decided to go back to the 90D since the pressure seemed to stretch the 70D O-ring but not swell it. Problem is I need to get the stuff all back together or I'll ether loose something or forget where I put the cap. I know the 90D O-ring won't cause me trouble since I've already tried it and I put some silicone O-ring grease on it this time. For some reason I had a nice long shooting season and didn't fade out and used up a whole cartridge. Since the rifle is zeroed I went to a small swinging target I made. The target area is the size of something like a postage stamp and I use the little stick-on red squares that come with the full targets. When I've shot off most of the stick-on I try for the little pieces that are left. near the end, as the pressure started to drop I could use the dots on the cross-hairs. This has turned out to be a lot of fun and I thank you all for your help.

--- End quote ---

Glad you are up and running again and having fun. That’s the whole point of airguns, right? Well, it is for me.:D

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