PGP o-ring sizes

aaronlecain · 09-11-2007, 03:37 PM

I am rebuilding and restoring an old style PGP and in taking the valve and all the other internal guts out I noticed that the o-rings were not o-rings anymore but just some rubber stuck to the brass. I got a seal kit from PPS and the two o-rings for either side of the valve are too fat and won't let the assm to compress enough to put the nut back in. could i be doing something wrong or do i need different o-rings. when I was took the valve nut out there was no o-ring but a soft metalic ring (like lead) instead.

this is my first pgp and any help would be great. thanks
-Aaron

c6quad · 09-11-2007, 05:00 PM

the real fat o-rings that come in a rebuild kit are bolt o-rings. the 2 skinny o-rings are for the valve. the smaller skinny o-ring goes on the steel chamber plug and the bigger skinny o-ring goes on the brass exhaust valve body where it "butts" against the brass sleeve. the lead seal you removed does not get replaced so throw it away and put the valve back together without it.

aaronlecain · 09-11-2007, 05:09 PM

so it must have been packaged wrong cause i got one skinny one for the steel 12gr seal and three fat ones. I thought I was doing it right. thanks.

c6quad · 09-11-2007, 11:37 PM

no problem. sounds like they left one out then.

aaronlecain · 09-12-2007, 07:28 AM

I replaced the o-rings with thinner ones but now i have another problem. once i put the 12gr in it doesnt break the seal. when i fire it it breaks the seal and vents all the co2 out of the vent hole in the bottom tube. I believe this to be caused by the plug that holds the co2 in because the puncture seal is good. the co2 plug has the cap, screw and a guide. the guide is very loose. In the exloaded view (in the manuel) on the pgpog it shows a lock washer between the guide and the cap so i can only imagine that its not supost to be so loose sence mine doesnt have it. any info on that?

c6quad · 09-12-2007, 01:52 PM

it won't break the seal until you do fire it. that's normal.

it sounds like your cap is bottoming out (running out of thread) and not putting enough pressure on the 12 gram to make it seal. try adding a washer in between the threaded cap and the aluminum cone (the piece that touches the back of the 12 gram). doing that will allow you to put more pressure on the 12 gram so it'll seal. try that and let me know if that fixes it.

09-11-2007, 03:37 PM	#1 (permalink)
aaronlecain MCB Member Join Date: Jun 2007 Location: Belmont NH	PGP o-ring sizes I am rebuilding and restoring an old style PGP and in taking the valve and all the other internal guts out I noticed that the o-rings were not o-rings anymore but just some rubber stuck to the brass. I got a seal kit from PPS and the two o-rings for either side of the valve are too fat and won't let the assm to compress enough to put the nut back in. could i be doing something wrong or do i need different o-rings. when I was took the valve nut out there was no o-ring but a soft metalic ring (like lead) instead. this is my first pgp and any help would be great. thanks -Aaron __________________ Feedback http://www.mcarterbrown.com/forums/f...-feedback.html customcockers.com http://www.customcockers.com/forum/s...ht=aaronlecain Phog http://idriders.com/ThePhog/index.php/topic,10.0.html

09-11-2007, 05:09 PM	#3 (permalink)
aaronlecain MCB Member Join Date: Jun 2007 Location: Belmont NH	so it must have been packaged wrong cause i got one skinny one for the steel 12gr seal and three fat ones. I thought I was doing it right. thanks. __________________ Feedback http://www.mcarterbrown.com/forums/f...-feedback.html customcockers.com http://www.customcockers.com/forum/s...ht=aaronlecain Phog http://idriders.com/ThePhog/index.php/topic,10.0.html

09-12-2007, 07:28 AM	#5 (permalink)
aaronlecain MCB Member Join Date: Jun 2007 Location: Belmont NH	I replaced the o-rings with thinner ones but now i have another problem. once i put the 12gr in it doesnt break the seal. when i fire it it breaks the seal and vents all the co2 out of the vent hole in the bottom tube. I believe this to be caused by the plug that holds the co2 in because the puncture seal is good. the co2 plug has the cap, screw and a guide. the guide is very loose. In the exloaded view (in the manuel) on the pgpog it shows a lock washer between the guide and the cap so i can only imagine that its not supost to be so loose sence mine doesnt have it. any info on that? __________________ Feedback http://www.mcarterbrown.com/forums/f...-feedback.html customcockers.com http://www.customcockers.com/forum/s...ht=aaronlecain Phog http://idriders.com/ThePhog/index.php/topic,10.0.html

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09-11-2007, 05:00 PM	#2 (permalink)
c6quad MCB Member Join Date: Apr 2006 Location: NC	the real fat o-rings that come in a rebuild kit are bolt o-rings. the 2 skinny o-rings are for the valve. the smaller skinny o-ring goes on the steel chamber plug and the bigger skinny o-ring goes on the brass exhaust valve body where it "butts" against the brass sleeve. the lead seal you removed does not get replaced so throw it away and put the valve back together without it.

09-11-2007, 11:37 PM	#4 (permalink)
c6quad MCB Member Join Date: Apr 2006 Location: NC	no problem. sounds like they left one out then.

09-12-2007, 01:52 PM	#6 (permalink)
c6quad MCB Member Join Date: Apr 2006 Location: NC	it won't break the seal until you do fire it. that's normal. it sounds like your cap is bottoming out (running out of thread) and not putting enough pressure on the 12 gram to make it seal. try adding a washer in between the threaded cap and the aluminum cone (the piece that touches the back of the 12 gram). doing that will allow you to put more pressure on the 12 gram so it'll seal. try that and let me know if that fixes it.