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Old 04-21-2019, 03:14 PM   #1 (permalink)
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Perplexing KP leak

Iíve got what I think is a KP2. Itís a bolt action by Chplnstone.

Having a weird leak. Sometimes when I air it up, it leaks slowly at what sounds like the face seal. So, I replaced the face seal with a new one from Palmers and still have the issue. But only sometimes.

I cranked the CO2 knob as tightly as I could mid-leak using a flat head and the leaking stopped.

Tried again and tightened by hand as much as I could and the leak was minimal, and stopped leaking after a few shots.

The rest of the valve o-rings are in tact.

This sounds like a face seal thing still, despite the new seal. Thoughts?
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Old 04-23-2019, 09:34 PM   #2 (permalink)
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you may need to extend the rod a bit - maybe a washer spacer. To determine if it's the face seal you can leave the marker cocked, eliminating the weight of the hammer possibly pushing on the valve stem.
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Old 04-24-2019, 04:39 PM   #3 (permalink)
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Quote:
Originally Posted by Mar View Post
you may need to extend the rod a bit - maybe a washer spacer. To determine if it's the face seal you can leave the marker cocked, eliminating the weight of the hammer possibly pushing on the valve stem.
Good call--I did try exactly that during my first test and it seemed to help a bit. I'll try again with washer to add space. Thanks, mar!

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...To determine if it's the face seal you can leave the marker cocked, eliminating the weight of the hammer possibly pushing on the valve stem.
Do you mean leave it cocked after inserting the 12g?
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Old 04-24-2019, 05:20 PM   #4 (permalink)
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Do you mean leave it cocked after inserting the 12g?
Yes (though if this is a shoot to pierce you will need to re-cock it after you pierce the 12g) this should eliminate the hammer as a variable (if it has too much tension or the valve has too little then the valve may be held slightly open causing the leak)

in essence you are going to want to remove any variable which could open the valve, you are looking for a closed system of 12g->valve. Then you may have a better chance of hunting down exactly what is leaking.
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Old 04-26-2019, 04:10 PM   #5 (permalink)
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popped in for my twice annual mcb check, now curious how this turned out?
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Old 04-26-2019, 05:12 PM   #6 (permalink)
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Originally Posted by chplnstone View Post
popped in for my twice annual mcb check, now curious how this turned out?
Update:

I added spacers to the plunger, but it didn’t seem to be the issue.

Insert 12g, tighten co2 changer, cock and pull trigger. Begins leaking after first shot. Cock again, still leaking. FYI—using Leland 12gs.

Weirdly enough, this has been happening off and on for a while. It seems like every 3rd 12g I use, the leaking stops and it works fine for the rest of the day.

Besides a full rebuild/o-ring swap, any other ideas? It’s got to be a valve seal, right?
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Old 04-26-2019, 05:18 PM   #7 (permalink)
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If you used a Palmers face seal it could be the problem. For some reason they seem to be harder durometer and there are variances with the hole in the center ( offset/larger than normal). I'd contact MaD on here or Bacci Paintball and try there face seals.
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