old benjamin 347 with low pressure after repair
Select Gate
READ GTA FORUM RULES BEFORE POSTING
GTA Forum Help Desk
GTA Announcement Gate
Dealer Area
GRIP
AirgunWeb Airgun Videos
Airgun Repository of Knowledge
Vendors and Vendor Videos
AirGun Expo 2021
Airgun Expo 2022
Contests and Giveaways!!!
Welcome New Members
In Memoriam
GTA Contributing Members
Shot Show Videos
Hajimoto Productions
Airgun Detectives
Air Gun Gate
BB Guns and Such
"Bob and Lloyds Workshop"
American/U.S. Air Gun Gates
European/Asian Air Gun Gates
PCP/CO2/HPA Air Gun Gates "The Darkside"
Air Archery
Vintage Air Gun Gate
Air Guns And Related Accessories Review Gates
Hunting Gate
Machine Shop Talk & AG Parts Machining
3D printing and files
Buyer's, Seller's & Trader's Comments
Bargain Gate
Back Room
Target Shooting Discussion Gate
Target Match Rules
Shooting Match Gates
Field Target Gates
The Long Range Club
100 Yard Match
Discussions By States
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email
?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
Home
About
Help
Old GTA
Gallery
Search
Stats
Login
Register
Advertise Here
GTA
»
All Springer/NP/PCP Air Gun Discussion General
»
American/U.S. Air Gun Gates
»
Crosman-Benjamin Air Gun Gate
»
old benjamin 347 with low pressure after repair
« previous
next »
Print
Pages: [
1
]
Go Down
Share This!
Author
Topic: old benjamin 347 with low pressure after repair (Read 210 times))
cmhobbs
Shooter
Posts: 95
old benjamin 347 with low pressure after repair
«
on:
January 15, 2022, 08:03:44 PM »
Hello, folks! Long time, no post. Recent events in life have brought me back to my airguns! While taking some inventory, I pulled a Benjamin 347 out of the cabinet that had a "stuck pellet" note on it. So some history and a question:
I bought this rifle in a non-working condition. Got a repair kit from Pyramyd Air (PY-A-624) for models with a soldered valve. Took this dude apart (what a chore!) and got the new guts put in. It shot great for maybe 50-100 rounds and then a pellet got stuck in the barrel. Pressure seemed to drop over time dramatically. Into the cabinet it went for probably a year or more and I just pulled it out, cleared the pellet, ran a cleaning pellet through it and it seemed to shoot just fine. Dropped a real pellet into it and it got stuck again.
I don't detect any leaks and it seems to generally operate just fine, it's just not holding pressure. It does make a quick sucking puff noise when you extend the pump handle all the way out but it's always done that after I repaired it and I assumed that was the rifle drawing air in but maybe I've done something wrong.
Anyone have any idea what might be going on? Should I pick up another repair it and undergo that crazy process again?
Thanks!
Logged
happymecanic
Expert
Posts: 1277
Real Name: Francois
Re: old benjamin 347 with low pressure after repair
«
Reply #1 on:
January 15, 2022, 09:06:43 PM »
What material were your new seals made from? I rebuilt my Benji 310 with teflon seals and had to keep it pressurized with 4-5 pumps for a few days for the seals to ''seat'' well. I seem to remember some tuners recommend to give the new front seal a tap with a wooden dowel and hammer to help seating it.
Also I need to cock the gun before pumping, otherwise pressure doesn't build up. HTH.
Logged
Canada
cmhobbs
Shooter
Posts: 95
Re: old benjamin 347 with low pressure after repair
«
Reply #2 on:
January 16, 2022, 01:22:23 AM »
Hey, thanks for the reply!
I'm pretty sure they were nylon and/or rubber. Here's the kit I used:
https://www.pyramydair.com/product/benjamin-sheridan-repair-kit-fits-some-pre-1995-multi-pump-guns-w?a=624
I tried cocking it before pumping and that seems to have worked once but it failed a second time. I do wonder if perhaps it's also a pellet issue. The pellets getting stuck were crosman's hollow points (a variety I typically avoid but they were gifted to me). I fired a crosman match pellet and a jsb match pellet with no issues. Same weight.
I figured the seals would be set by now but just in case, I went ahead and cocked it, pumped it 5 times, put the safety on, and put it in the cabinet.
Couple of questions while I'm thinking about it: what's the typical range for number of pumps on these and how far should they shoot? I know they're not going to be as hot as my modern airguns. Is there also a modern version of this particular rifle? I'd like to shoot this one sparingly due to age so it'd be neat to have a twin model I could play with a bit.
Logged
Back_Roads
I Got A 15 Pump BB Gun :) BB Guns Got Much More Complicated :)
GTA Senior Contributor
Posts: 15949
1st Edition Crosman 760 Pump Master
Real Name: James Seiler
Re: old benjamin 347 with low pressure after repair
«
Reply #3 on:
January 16, 2022, 02:35:47 PM »
Not in .177 but in .22, and some have been converted to .177 in the short time they have been on the market.
https://www.crosman.com/
Logged
Wisconsin Collins Hunters Paradise" There's a Sign in Town to Prove It
https://www.zeemaps.com/group=962067
Member Map.
[smg id=6202]
https://www.youtube.com/channel/UC3hMPAjvTtuu7DoNzBZzuKQ?view_as=subscriber
https://youtu.be/PZvrk-L6Gzg?list=PLASJo4rBxMIkewLOlcMHC56YM0BpdR6cb
https://youtu.be/bk_N1l7H2F4?list=PLASJo4rBxMIk6BNY6V_tZahlmptN6qBlk
cmhobbs
Shooter
Posts: 95
Re: old benjamin 347 with low pressure after repair
«
Reply #4 on:
January 21, 2022, 04:07:45 PM »
quick followup: i kept about 5 pumps in the rifle for just over a week and that seems to have resolved the issue, thankfully. i suppose i'll store it with a couple pumps in it from here on out. thanks for the info!
Logged
Print
Pages: [
1
]
Go Up
« previous
next »
GTA
»
All Springer/NP/PCP Air Gun Discussion General
»
American/U.S. Air Gun Gates
»
Crosman-Benjamin Air Gun Gate
»
old benjamin 347 with low pressure after repair