HELP! BENJAMIN 392 leaky valve?

[TheBullsEye]

Hey guys I am fixing a 392 Benjamin pump and I coming let KT resealed it put it back together and when I pump it air gets pushed out the barrel what am I missing did I assemble the valve wrong or is the valve spring weak?

[Back_Roads]

 Is the 392 one that needs the bolt cocked before pumping ?

[TheBullsEye]

I tried that it’s like the air is leaking around the valve or something ? When I pump if I put my finger over the barrel the back pressure leaks by the trigger or that’s what it sounds like ?

[Back_Roads]

 Nope sounds like something isn't sealing right or sticking , maybe try a flush ?

[TheBullsEye]

Flush? Not familiar with that term I tried the old seals back on the valve those were fine not nicks or anything and it still leaks I did a light film of clear tar on the valve and orings still doesn’t seal is my tube ovel maybe?

[Back_Roads]

 Put rubbing alcohol in the pump area and pump it through the gun it will help free up any contaminates, that could cause a valve to stick, if that doesn't help another tear down is in order.

[TheBullsEye]

I’ll try flushing it ive left it apart so I don’t gotta drive those dang roll pins out over and over

[tennx]

I dont put rollpins back in until I know gun will function....I use small bolt in place of pin...good luck

[TheBullsEye]

Yes I bought a kit to reseal it .  I got it to pump last night by pumping short rapid strokes until I felt pressure and didn’t hear air leaking through now it seems to work so I put a few pumps in and let it sit over night

[tennx]

I’m sure u know a new brass valve from Crosman is $12.00...I’m waiting on one now....

[avator]

Was there one spring in the valve or two?
If two then the normal looking spring goes in the front of the valve against the check valve. Then a washer.. then the conical spring with the small end facing the rear of the valve against the poppet.

[TheBullsEye]

wellbi was up at Trenier outdoors today and we grabbed  some pelligun oil dumped her in and it sealed right up so I guess problem solved