Air Venturi AV Avenger “under charging”

[1 Wheel Drive]

Yeah, I’ve seen the same thing on o-rings on motorcycles. They take a set after being squished for a long time. The shape of these are unique, I’m guessing because they were also distorted by the high pressure. I’ll do a show and tell when the new ones come in.

 

[1 Wheel Drive]

Received my o-ring kit from Captain o-ring, and replaced the rings I had found were leaking with the soapy water snoop test. The bad o-rings were three of the four 13-3 rings and both of the 12-2.5 rings in the two air chambers. Charged it right up to 300 bar with no problem and no further leaks seen at those places with a follow-up snoop test.

The old rings were stiff and hard to remove from their grooves, even with a hooked pick tool that I use for brake seals. I found it was much easier getting them off once I warmed them up well with a heat gun (industrial hair dryer). Installed each ring with a couple of drops of RWS silicone air gun oil. I did not bother with any locktite that some folks call out. Once the chamber is at pressure, there is no way those fittings are budging, nevermind coming unscrewed.

Below is a phone picture of the old hardened o-rings (top 2) vs. the new ones. 12mm on the left and 13mm on the right. If you look closely you can see that the tops of the two old ones are flat on top. They also did not stretch as easily until warmed up.