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All Springer/NP/PCP Air Gun Discussion General > American/U.S. Air Gun Gates

Sheridan blue streak repair

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sheneron:
Hi,

I have been working on my sheridan blue streak and I was able to get it all apart and begin replacing the parts, thanks to help in my other thread.

However, the issue I have now it that when I replace the valve stem and the gaskets and then put things back in the barrel and set the retaining nut, I cannot get it to hold air. If I pump it, I can hear air leaking. I don't know what this could be since I have replaced things.

Can you think of anything I may be missing or something I could be doing wrong? There seems to be a little pressure, but it leaks out pretty quickly, like in a couple seconds.

DanD:
Hi sheneron.
Does the gun leak when you cock it before pumping?
If so,  you might want to see if tightening the valve retainer nut is enough to get it to seal.
Good luck!

Back_Roads:
 I recall having to give the valve nut a bit more torque to get a seal on mine when I did a reseal.

sheneron:
Alright I'll try these two things, thanks.

I've torqued the nut pretty hard but I'll see if I can do it more.

I can't cock it now because I took everything a part, but I'll put that back together and see if it helps.

DanD:
Testing with the hammer and trigger not installed is the same as testing it uncocked. Assembling those parts won't help fix the leak.
The things that could leak on the closing stroke like you described are the middle seal between the valve body and exhaust body, the seal between the nut and exhaust body, and the exhaust poppet's sealing surface against the exhaust body. If tightening the retaining bolt doesn't help, you'll need to disassemble and verify all sealing surfaces are clean and none were damaged during assembly. You may also want to verify that the original lead seal between the valve body and exhaust body is not still in the valve- if it is, you may wish to leave it there and try to reassemble without that seal from your kit, or remove it and assemble with only that seal from your kit.
Aso verify that when you assembled it, the small valve spring went in first, then the separating washer, then the longer, stiffer spring with its big end toward the front of the gun. If these springs are reversed it might not have enough pressure to hold the exhaust valve closed. The longest skinniest spring is the hammer spring.
I hope that made sense...
Good luck!

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