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Old 11-04-2012, 04:43 PM #1
uranjack
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Small leak in DM9

So I've been chasing a leak for a few days. I can hear air (When I put my ear next on top of the feed neck) when the gun is aired up. I can not feel any air passing through the front of the bolt. Wether that be through the bolt tip/around the cylinder.
Edit: I have change the bolt sail a few times, I replaced both bolt bumpers, the front internal cylinder oring.
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Last edited by uranjack : 11-04-2012 at 04:47 PM.
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Old 11-04-2012, 05:10 PM #2
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Quote:
Originally Posted by uranjack View Post
So I've been chasing a leak for a few days. I can hear air (When I put my ear next on top of the feed neck) when the gun is aired up. I can not feel any air passing through the front of the bolt. Wether that be through the bolt tip/around the cylinder.
Edit: I have change the bolt sail a few times, I replaced both bolt bumpers, the front internal cylinder oring.
if you do not hear around when you put your finger in the bolt, then • If air is leaking from around the bolt, replace the
#017 located inside the cylinder and the front #020
on the outside of the cylinder

sometimes you have the change the oring more then once to seal, as not all orings are perfectly round and shaped.., try and pin point the leak a little more, it could be a small leak in the LPR, make sure your bolt tip isn't scratched where it could stop it from sealing. Are you using black buna orings? or are you using colored?. sometimes the black ones i've noticed are made smaller. depending where u get them from.
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Old 11-04-2012, 05:19 PM #3
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I have replace the #17 inside the cylinder, with both black and colored orings.
I have also replaced the #20 on the outside of the cylinder a few times.
I cannot feel any air escaping through the front of the bolt.
The bolt has no scratches. That's why i'm scratching my head.
What should I look at in the LPR?
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Old 11-04-2012, 05:33 PM #4
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Quote:
Originally Posted by uranjack View Post
I have replace the #17 inside the cylinder, with both black and colored orings.
I have also replaced the #20 on the outside of the cylinder a few times.
I cannot feel any air escaping through the front of the bolt.
The bolt has no scratches. That's why i'm scratching my head.
What should I look at in the LPR?
Check your reg pressure make sure it's set at about 150 PSI, if you don't have a reg tester.. then, it's approx 4.5 turns out on the HPR, I Believe, make sure the LPR is adjusted correctly, 3.5 - 4 turns.

As far as the LPR leaking, take it out and check the 012 orings, and then on the inside of the LPR housing, the small 007. (I've only once had 1 LPR cause a bolt leak)

Other then that.. if none of that works, I'd see about calling dye and getting a urethane o'ring for the CAN. or see if you can take a CAN off a DM8,9,10,11,12 or M8. and see if it works you could need a new one
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Old 11-04-2012, 07:14 PM #5
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Anyone else have an suggestions?
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Old 11-07-2012, 06:23 PM #6
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Update: I changed out the #006 LPR body internal oring, and the #010 LPR seat retainer oring, that fixed the leak.
Oh btw I hate the #006 oring. Took me 2 tries before I got it in there without breaking it.
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Old 11-07-2012, 06:24 PM #7
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Ha, I didn't realize I was on a different account.
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Old 11-07-2012, 08:25 PM #8
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Thats great! (I have awesome advice), but it should be a 007 oring btw so is everything working
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Old 11-08-2012, 06:06 PM #9
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Sorry, yes the #007 oring.
Body internal O-ring (007 UR90)

Yes everything is working great.
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Old 11-08-2012, 06:09 PM #10
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Quote:
Originally Posted by uranjack View Post
Sorry, yes the #007 oring.
Body internal O-ring (007 UR90)

Yes everything is working great.
so that oring also stopped your CAN leak? (it's really weird it did that, as I've only once ever in my career see it make a bolt leak) was there any leaks under the frame?
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Old 11-09-2012, 02:48 PM #11
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I never said it leaked from the can, I was just able to hear the leak from the feed neck and no where else. The leak came from inside the marker, in the bolt area.
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