Print Page - too much compression!

Title: too much compression!
Post by: riseandrun on February 26, 2011, 08:23:46 PM

Hi guys,
New to the forum today. I have a 1377 that my neighbor found in the garbage doing his route one day. He gave it to me. It had some compression when I first got it, but didn't shoot very good. I put a few drops of motor oil in the spot marked and ruined the seals and....? Wrong oil I now know. Use air gun oil. I've taken the entire thing apart, cleaned it all up wiping down the insides with a clean cloth and air gun oil (lost the safety ball in the process)
I've replace the exhaust valve assy. , pump cup assy., and the breech gasket? My problem now is I have so much compression I can't get the pump cup back in. I tried using a dowl rod to the back of the exhaust valve assy, and even found doing a search that that was standard procedure. It didn't work for me which now makes me wonder if I'm doing something wrong, or I got a bad "new" part.
Looking forward to shooting it, and maybe even doing a few modifications to it.
TIA
Kevin

Title: Re: too much compression!
Post by: Brutuz on February 26, 2011, 10:05:01 PM

Welcome Kevin, have you checked the exploded view?

http://www.crosman.com/pdf/manuals/crosman/1377/C1377-EVP.pdf (http://www.crosman.com/pdf/manuals/crosman/1377/C1377-EVP.pdf)

Title: Re: too much compression!
Post by: Crosshairs on February 26, 2011, 10:28:28 PM

I think you need to open the valve,try pushing the valve stem it should releace the pressure.
Mike

Title: Re: too much compression!
Post by: arkmaker † on February 27, 2011, 12:51:12 AM

Yep. I think Mike has it right. Sounds like the valve is pressurized.

Make sure nothing is in the barrel, then cock and fire the gun in a safe direction. That should relieve any pressure built up in the valve...then try again!

Title: Re: too much compression!
Post by: riseandrun on February 27, 2011, 03:06:56 AM

Thanks for that great parts breakdown and advice. I realized my mistake in that I was trying to slide the pump cup assembly straight in instead of opening it up like I would when I pump up the gun. Anyway the roll pin is in and I've taken it out to the garage for a test firing. WOW!!! :D ;D :-* This is going to be fun. I'll do a little searching for favorite ammo and mods and .... see what I can learn from the pro's.

Where I live it's going to be way easier/cheaper to shot an air pistol than my 22 rifle.

Questions to follow.
Thanks again
Kevin

Title: Re: too much compression!
Post by: Crosshairs on February 27, 2011, 03:47:55 AM

Thats great news :-* :-* you won the battle ! Now shoot the hell out of it, we wanna see some pics and maybe a target.I like the R 10 match 8.2 gr RWS pellets in my 1377.
Mike
SHOOT SAFE !!! :-*

Title: Re: too much compression!
Post by: Darth on February 27, 2011, 04:32:45 AM

I get those "ball bearings" from automotive grease fittings ... they are 3/32 also. Just grind the backside of the fitting until the spring comes out. Really easy ... and an unlimited supply !!

Darth

Title: Re: too much compression!
Post by: Crosshairs on February 28, 2011, 10:19:09 PM

They are a pain in the butt,I lost one from my 1377 last year,I think most of have.
Mike

Crosman Air Pistol Owners Forum

Crosman air pistol - General => Crosman air pistol - General discussion => Topic started by: riseandrun on February 26, 2011, 08:23:46 PM