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 Post subject: AT-44 Valve Stem O-Ring
PostPosted: Thu Jan 01, 2015 1:18 pm 
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Joined: Fri Apr 15, 2011 2:28 pm
Posts: 215
Location: Northwestern Ontario
Anyone know the size of the little O-Ring on the valve stem?

My son bought a used AT-44 and the FPS was low. When I put my air tube from my Hammerli Pneuma, full power.

I removed the tube, relieved the air from the tubes of both guns to compare. Found the valve stem on my son's was hard to push & not returning back to seal like mine. I took the valve apart and the valve seemed to have a small burr from the holes being drilled in the discharge valve, & the valve stem o-ring was flattened on one side. i removed burr, replaced o-ring from a spare sub-500 valve stem. Now I would like to replace the borrowed valve stem o-ring & get a couple spares.



Scott

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Hammerli Pneuma Elite 10 .22 Hawke Varmint SF 4-16x44 ½ Mil Dot
Weihrauch HW97K .177, Hawke SR6 3-12x44
Baikal IJ-22 USSR .177
Gamo Compact
Gamo .177, BSA Contender 4-16x40mm (Son's)
Crosman Nitro Venom Dusk .177 Centerpoint 3-9x32mm (Son's)


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PostPosted: Sun Jan 04, 2015 4:43 pm 
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Location: Lower Mainland, B.C.
Ask Dan at the CAF store

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springers, pumpers, gassers, and a pcp


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PostPosted: Tue Jan 13, 2015 4:54 pm 
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Hey Weihrauch_HW97,
Did you ever get the measurements of Dash # on the valve stem o-ring?
I need one!!!
Kirk


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PostPosted: Tue Jan 13, 2015 8:07 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
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Location: Rocky Mtn Hse Alberta
Betting on
1.0mmx2.0mm

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Walter


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PostPosted: Wed Jan 14, 2015 9:34 am 
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Thanks Voltar1,
How is that big, busty redhead shooting?
The Groove ->


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PostPosted: Wed Jan 14, 2015 11:38 am 
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Location: Coalmont BC
1 x 2 or 1 x 3 ?

I thought the stem was 3mm....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Wed Jan 14, 2015 12:19 pm 
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Joined: Wed Aug 27, 2014 6:09 pm
Posts: 10
Thanks Bob,
I'll go down and measure it later today, just need to pull the valve out.
The darn o-ring is not part of Hatsan's o-ring repair kit, so I was going to buy it at the local Hardware store.


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PostPosted: Wed Jan 14, 2015 3:03 pm 
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1 mm x 2 mm; off the HD.


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PostPosted: Wed Jan 14, 2015 3:42 pm 
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Location: Coalmont BC
4 mm OD x 2 mm ID x 1 mm thick, I just measured one....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Wed Jan 14, 2015 7:38 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
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Location: Rocky Mtn Hse Alberta
Metric print specs are cross section x inside diameter.
Therefore 12th

Cheers

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PostPosted: Thu Jan 15, 2015 12:02 pm 
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Sorry Voltar1,
Can you simplify for this grasshopper............."Metric print specs are cross section x inside diameter.
Therefore 12th" ....... no comprendo!
Kirk


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PostPosted: Thu Jan 15, 2015 12:21 pm 
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Location: Coalmont BC
I'm glad you asked, it means I don't need to show my ignorance.... (oops, I just did!)....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Thu Jan 15, 2015 2:34 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
Sorry fellas
My iPhone does that to me

Therfore 1x2mm

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PostPosted: Thu Jan 15, 2015 10:45 pm 
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Joined: Fri Apr 15, 2011 2:28 pm
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Location: Northwestern Ontario
Changed it out. No difference. Still getting 630fps on chrony. I measured the valve stem compared to my Pneuma & the same. Is there anything else with valve that could be giving lower valocity?

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Hammerli Pneuma Elite 10 .22 Hawke Varmint SF 4-16x44 ½ Mil Dot
Weihrauch HW97K .177, Hawke SR6 3-12x44
Baikal IJ-22 USSR .177
Gamo Compact
Gamo .177, BSA Contender 4-16x40mm (Son's)
Crosman Nitro Venom Dusk .177 Centerpoint 3-9x32mm (Son's)


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PostPosted: Fri Jan 16, 2015 12:51 am 
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Joined: Thu Feb 02, 2006 11:35 pm
Posts: 3099
Location: Alberta Canada
Is the return spring same size as in wire, coil count, length. What about the ports are they the same in size?

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Whitewolf


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