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

Weird piston seal

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Camel73:
Found this in my Titan NP .22 and thought I'd share and see what others think about it.
I've put mainly Premier ultra magnums through it, about 500 shots. Last week I put 10 shots through the chrony which averaged 720 fps.

ricksplace:
The seal needs to be replaced.
The two nicks on the bottom of the seal in the picture are allowing compressed air to leak past the seal. This drops your velocity and causes the piston to hit the end of the compression tube harder than it should.  It appears from the picture that the piston is peening already. This condition also causes that "scope killing recoil" from the piston crashing into the end of the compression tube. Very common problem with the B18 Crosman variants that use a gas strut or nitro piston.
Give the gun a lube-tune and replace the seal. Your gun will shoot faster, kick less, last longer, and shoot more accurately with a larger variety of pellets. 
Rick.

ps. You might want to check your breech seal when you get it back together. Tissue paper and dental floss...

RinCG:

--- Quote from: ricksplace on July 01, 2016, 06:13:12 AM ---The seal needs to be replaced.

Give the gun a lube-tune and replace the seal. Your gun will shoot faster, kick less, last longer, and shoot more accurately with a larger variety of pellets. 
Rick.

ps. You might want to check your breech seal when you get it back together. Tissue paper and dental floss...

--- End quote ---
Point repeated and pay special attention to doing a proper deburring. I've seen worse but it is a bugger when the burrs aren't properly addressed.

Motorhead:
Yup ... the super heated air created during the firing cycle leaking past a nick in the seal burns away at the nick and creates a trough  :P

Camel73:
I didn't even notice the peening... looked down the tube and it's mirrored. Kind of bummed about getting such an obvious defective seal. I took the stock off before I shot it and the safety spring wasn't connected.  ??? It was the last one there out on the rack.

Oh well, good thing I got it instead of some youngster who actually wanted to hit something, ha. Groups are really bad. Brass washers are on my shopping list but everything is closed... Canada Day eh :)

Here's a couple pics of the outside of the piston cylinder,. Was wondering if this will resolve itself with proper care.

... and another pic of the breech seal.

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