Will a leaking transfer port seal affect accuracy?
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Will a leaking transfer port seal affect accuracy?
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Topic: Will a leaking transfer port seal affect accuracy? (Read 5682 times))
Raizer
Sharp Shooter
Posts: 686
Real Name: Shiloh
Will a leaking transfer port seal affect accuracy?
«
on:
October 12, 2012, 01:08:50 PM »
As above, will a leaky transfer port seal affect accuracy on a qb79 or will it just be down on power?
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New Zealand
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uarter
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ore
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Backyardsniper1
Sharp Shooter
Posts: 712
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #1 on:
October 12, 2012, 01:48:08 PM »
I'm inclined to believe that it will do both. More air or gas wasted and not directed to where you want it to go.
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Warren,Ohio
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21grains
Plinker
Posts: 258
Real Name: Franky
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #2 on:
October 12, 2012, 02:06:07 PM »
Hi Raiser;Had one in Disco, POI change, Power down,Accu. same for awile than POI change again,Power down alot. Accu. bad string up & down..Sent for Seal and extra one. OK now.....Franky
«
Last Edit: October 12, 2012, 02:07:51 PM by 21grains
»
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SE-Mass.
Motorhead
Field Target Shooter .... Stand em up Shoot em down
GTA Senior Contributor
Posts: 17763
2019 GTA Hall Of Fame Recipient
Real Name: Scott
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #3 on:
October 12, 2012, 02:12:40 PM »
BOTH ... temperature, weight of pellet along with any other influence that changes ever so slightly the degree leak actually leaks will change POI and velocity.
FIX IT !!
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Northern California ... Old Hangtown
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Raizer
Sharp Shooter
Posts: 686
Real Name: Shiloh
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #4 on:
October 12, 2012, 02:15:31 PM »
That sounds like what mine is doing, will have a go at making a new seal soon.
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New Zealand
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uarter
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ore
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Raizer
Sharp Shooter
Posts: 686
Real Name: Shiloh
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #5 on:
October 12, 2012, 04:06:49 PM »
Just realized if you look close you can see exactly where the leak is, has been like this the whole time I've had the gun, I had just never thought about it or fired it with my hand by the seal.
The other side doesn't have that gap and doesn't leak.
I read somewhere you can use a 007 o-ring as a transfer port seal, does that sound right?
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New Zealand
Q
uarter
B
ore
79
- BSA Barrel - Hawke Varmint 4-16x44SF
Hatsan Striker 1000s .177 - Nikko Stirling Gold Crown AirKing 4x32AO
BSA Super Meteor mk3 .177
Rossi 4.5
Relum .177
Motorhead
Field Target Shooter .... Stand em up Shoot em down
GTA Senior Contributor
Posts: 17763
2019 GTA Hall Of Fame Recipient
Real Name: Scott
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #6 on:
October 12, 2012, 04:54:50 PM »
o-rings can work if diameter and thickness fill the space.
Short piece of squarely cut correct length plastic tube or hose can be made to work as well.
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Northern California ... Old Hangtown
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Home of MOTORHEADS AG Tuning Services
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Raizer
Sharp Shooter
Posts: 686
Real Name: Shiloh
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #7 on:
October 12, 2012, 05:00:26 PM »
Just fixed it, all it took in the end was removing the breach then putting it back on square.
I think I must have knocked it or something when I was mucking around with the clipping issue the other day as the gun has just gotten a fair bit quieter, it got a lot louder the other day when I drilled the hole in the end of my LDC out another mm, I thought the increased sound was from that
Now to have another go at sighting it in as soon as this wind dies down!
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New Zealand
Q
uarter
B
ore
79
- BSA Barrel - Hawke Varmint 4-16x44SF
Hatsan Striker 1000s .177 - Nikko Stirling Gold Crown AirKing 4x32AO
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Rossi 4.5
Relum .177
Ribbonstone
GTA Senior Contributor
Posts: 12030
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #8 on:
October 12, 2012, 08:38:34 PM »
They never seem to leak consistently, so it does seem to make accuracy a bit sucky (occasionaly too high/too low shots). Might not notice it with 3 shot groups, but will notice it with 5 shot.
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Louisiana
Raizer
Sharp Shooter
Posts: 686
Real Name: Shiloh
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #9 on:
October 12, 2012, 10:39:08 PM »
Have taken 2 thrushes and a black bird at close to 40 meters so far today, am thinking the accuracy is back now!
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New Zealand
Q
uarter
B
ore
79
- BSA Barrel - Hawke Varmint 4-16x44SF
Hatsan Striker 1000s .177 - Nikko Stirling Gold Crown AirKing 4x32AO
BSA Super Meteor mk3 .177
Rossi 4.5
Relum .177
jimmie lee
Guns,Sleds,&Rock&Roll
Sharp Shooter
Posts: 939
Mitakuya Oyasin (all my relations)
Real Name: Jimmie Lee
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #10 on:
October 13, 2012, 04:37:50 AM »
I had accuracy issues with my Disco, changing POI, etc. Before tearing it down I was on the phone to Crossman explaining that I thought it had a bad crown. In retrospect, I remembered when I first got it and removed the front sight, the barrel end was not square (as the barrel end has a flat area that the grub screw contacts through the front sight), and was cocked to the side. I didn't think much on it at the time not being familiar yet with my Disco and the posts I made never got to the root of the problem I was experiencing which is why I changed the barrel. When I reassembled the breach and barrel I was extra careful to make sure the transfer port and barrel matched up square and flush. Whoever assembled the gun at the factory failed to mate the transfer port to the barrel properly and I suspect, when there was a rash of complaints on the forum regarding the Discovery poi issues, that it may have been as simple as a shoddy factory assembly. Many of you will remember back in the early summer that the darkside had this issue going on for almost a month with newly bought Disco's from several members. The overall consensus was "bad crown", bad barrel although I do remember MustangMike mentioning transfer port alignment.
Glad you posted this thread Shiloh; it jogged my brain and the solution I sought but couldn't find was there all along.
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Denton, Maryland
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rkr
GTA Senior Contributor
Posts: 4343
Re: Will a leaking transfer port seal affect accuracy?
«
Reply #11 on:
October 13, 2012, 06:50:24 AM »
I had nicked transfer port o-ring in my Scorpion but it didn't affect accuracy, only the power was low.
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Will a leaking transfer port seal affect accuracy?