Odd Taipan Mutant air leak.

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J

JDShapp

Member
Jun 7, 2015
437
7
Indiana, United States
I encountered a big surprise last night when I dug the Mutant out and decided it was time to squeeze off a few rounds. When I went to fill it up I discovered it had a leak, but not any leak I've encountered yet with an air rifle. When I tried to fill it beyond 125bar it immediately started leaking, but rather than degassing complete it simply stopped once it hit 125 again. After a couple test shots to see if it was going to hold I decided to leave it over night thinking, well hoping anyway, that it might have been something to do with being in cold temperatures in the car the last few weeks. After letting it warm up in the house I gave it another go after work tonight and got the same result.

So the question is, does anyone have a clue of what I'm looking at doing to solve this weird little problem?
 
O-rings starting to harden and take a shape set due to years of being under pressure.

As an o-ring sits in there groove and get exposed to high pressure it is NO LONGER ROUND. Over time the shape created by pressure will take a semi permanent set to this shape.

* If you have ever resealed a PCP and found the rings to come out kinda square and sometimes HARD .. there ya go !!



Once an o-ring is no longer round and no longer soft enough to shape shift with the pressure it has a high likelihood of leaking and especially so as pressure it must seal increases.



A little bit of O-rings 101 .. not a college course.



Scott S
 
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Once a PCP starts to leak it is time to replace all the 0-rings. If you replace only the reg 0-rings and put it back together it will likely leak right away from somewhere else or will soon afterwards.

I rebuild the PCP's all the time, if one 0-ring is hardened and flat there are usually others in the gun as well.

Thanks

Charlie Frear, Georgia Airguns
 
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I managed to get the reseal done with about as much trouble as I expected. Only O-ring I found damaged was the one between the air tube and the block. That one was so bad it broke in half when I took the pick to it. I'm pretty sure I went a little overboard on the silicone grease because the first couple test shots have sent some excess out of the vent for the regulator.

Now I play the waiting game to see if it has any slow annoying leaks.
 
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I recently got a used Taipan Mutant .22 standard and have a similar issue with air leaking out from where the grub screw holds the valve in the receiver and around the air tube base meets the receiver. Starts to leak if I charge anything past 110 bar but will stop once it gets down to 110 bar. Any further updates on if the OP's gun is fixed? Is the seal that failed #97 (13.5mm x 2mm O-ring) on the exploded parts schematic and does that seal the tapered end of the base to the front of the brass valve?
 
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