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| Help!! QB78D End Cap O-Ring Problem https://www.airgunforum.ca/forums/topic56899-15.html |
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| Author: | Voltar1 [ Fri Aug 16, 2013 11:51 pm ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
theoffroader wrote: We are going to get some O-rings tomorrow Do you know what size the barrel O-rings are??? My barrel O-rings are getting shredded every time i take out the barrel  Thanks Kim Brennan  Don't 'take out the barrel' Brennan 
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| Author: | theoffroader [ Fri Aug 16, 2013 11:54 pm ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
Voltar1 wrote: theoffroader wrote: We are going to get some O-rings tomorrow Do you know what size the barrel O-rings are??? My barrel O-rings are getting shredded every time i take out the barrel Thanks Kim Brennan Don't 'take out the barrel' Brennan  I have been doing some mods I just put in a 22XX transfer port seal I would just like to have some spare parts Thanks Brennan
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| Author: | Voltar1 [ Sat Aug 17, 2013 7:14 am ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
IIRC they are metric sizing...... I'll check 011 fit fine |
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| Author: | rsterne [ Sat Aug 17, 2013 10:24 am ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
RE shredding the barrel O-rings.... Debur the transfer port and setscrew hole carefully on the inside.... Then get a metric screw that fits the setscrew hole and sand the end smooth.... Install it in the breech FLUSH with the inside of the setscrew hole, and when you push the barrel in, the O-ring won't shred.... Remove it and install the setscrew.... If you put a collar (or washers) on it to make it stop flush you can also use it for removing the barrel, but if it sticks down too far you will still shred the O-rings and can scar up the barrel too.... Bob |
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| Author: | theoffroader [ Sat Aug 17, 2013 11:39 am ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
rsterne wrote: RE shredding the barrel O-rings.... Debur the transfer port and setscrew hole carefully on the inside.... Then get a metric screw that fits the setscrew hole and sand the end smooth.... Install it in the breech FLUSH with the inside of the setscrew hole, and when you push the barrel in, the O-ring won't shred.... Remove it and install the setscrew.... If you put a collar (or washers) on it to make it stop flush you can also use it for removing the barrel, but if it sticks down too far you will still shred the O-rings and can scar up the barrel too.... Bob Thanks Bob Looks like i will be doing some de-burring today I will be picking up some new O-rings today Walter Al said the size was 012 Will both sizes work?? ( 011 and 012 ) My dad is just going to get a few of each and have some spares Thanks for the help Brennan
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| Author: | rsterne [ Sat Aug 17, 2013 11:58 am ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
I use 012.... 3/8" ID x 1/2" OD x 1/16" nominal sizes.... You can probably stretch a 011 into the grooves and they may be less prone to shredding as they won't stick out much (if at all).... don't know about sealing though.... Bob |
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| Author: | Voltar1 [ Sat Aug 17, 2013 1:06 pm ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
012 fit too loose on mine. 011 stretch into the barrel grooves and yet stick up enough to seal. Try both for sure. An oring kit is a good thing to have around. |
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| Author: | theoffroader [ Sat Aug 17, 2013 2:29 pm ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
Voltar1 wrote: 012 fit too loose on mine. 011 stretch into the barrel grooves and yet stick up enough to seal. Try both for sure. An oring kit is a good thing to have around. We picked up 4 co2 cap seals They are just regular seals We are putting an order with Eric We are going to be getting 2 QB78D seal kits and a 2240 seal kit Should be good Brennan
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| Author: | rocker45 [ Sat Aug 17, 2013 2:49 pm ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
 Kids always costing me money and you fellows are not helping -  At least there is someone in the family that is not afraid to take the rifles apart and check them out -  Will have to get Brennan in a gun smith course someday Thanks for helping the young lad out - Brian |
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| Author: | theoffroader [ Sat Aug 17, 2013 2:54 pm ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
rocker45 wrote: :roll: Kids always costing me money and you fellows are not helping - .............................................................. Brian 
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| Author: | Whitewolf [ Sat Aug 17, 2013 4:53 pm ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
Just let me know when your in the market for a gently used lathe/ mill unit for him Brian....lol..... |
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| Author: | theoffroader [ Sat Aug 17, 2013 5:07 pm ] |
| Post subject: | Re: Help!! QB78D End Cap O-Ring Problem |
Whitewolf wrote: Just let me know when your in the market for a gently used lathe/ mill unit for him Brian....lol..... Our shop is first I just broke my barrel O-rings Luckily we just ordered 2 seal kits for the QB I would really like to get into machining Make myself some nice parts for the QB and 2240 Brennan
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