Beeman QB Chief .22 broke down

[OTmachine]

I agree with you OTmachine. But let me try to replace the o-rings first. Thanks for providing the info about the supplier.
Regards.

I have one apart now, so if you need dimensions, let me know.  Or Ribbonstone, who I believe has them all in his head, will probably chime in again.  He is very knowledgeable.

[wll2506]

I agree with you OTmachine. But let me try to replace the o-rings first. Thanks for providing the info about the supplier.
Regards.

I have one apart now, so if you need dimensions, let me know.  Or Ribbonstone, who I believe has them all in his head, will probably chime in again.  He is very knowledgeable.

What is the ID of the air tube and the OD of the hammer spring :-)

wll

[OTmachine]

I agree with you OTmachine. But let me try to replace the o-rings first. Thanks for providing the info about the supplier.
Regards.

I have one apart now, so if you need dimensions, let me know.  Or Ribbonstone, who I believe has them all in his head, will probably chime in again.  He is very knowledgeable.

What is the ID of the air tube and the OD of the hammer spring :-)

wll

Air tube O.D. = 1.023” (26mm), I.D. = .868” (22mm) and the Hammer Spring is of .047” wire thickness x .396” ( a little over 10mm)  O.D.

[z_johnq]

No, I haven't yet but I will soon.

Keith was right about replacing the o-rings on the barrel doesn't solve the issues. And the o-rings that I bought today really not worthy: I put on the o-rings and reinstalled the barrel; after pumping some air and still leaking; then removing the barrel again. After checking the condition of the new o-rings, I found they got damaged again. Either the o-rings are inferior or the housing that holds the barrel/o-rings is too coarse, maybe both are of low quality. So much for the 'madeinchina' stuff.

[z_johnq]

Sorry but forgot uploading the pic of the o-rings. Hope it will show up.

I didn't go to ACE since a HarborFreight store is pretty close. ACE is kind of far. Guess it's a pretty bad move.

[BigBird]

Sorry but forgot uploading the pic of the o-rings. Hope it will show up.

I didn't go to ACE since a HarborFreight store is pretty close. ACE is kind of far. Guess it's a pretty bad move.

You'll probably pay a whole lot less per unit for Harbor Fright orings but you'll be left with a bunch of huge orings that you never use.  I did find that if you cut up one of a larger one you can replace that little spring for the safety detent in a Crosman 1322 grip. Just the right length and you never lose a "spring" again (since it is black).  Other than that I don't know what to use the big ones for.

[OTmachine]

No, I haven't yet but I will soon.

Keith was right about replacing the o-rings on the barrel doesn't solve the issues. And the o-rings that I bought today really not worthy: I put on the o-rings and reinstalled the barrel; after pumping some air and still leaking; then removing the barrel again. After checking the condition of the new o-rings, I found they got damaged again. Either the o-rings are inferior or the housing that holds the barrel/o-rings is too coarse, maybe both are of low quality. So much for the 'madeinchina' stuff.

It appears to me that the transfer port in the barrels are not deburred leaving a sharp edge which will cut the o-ring in one place.  Also, some silicone grease for o-ring lube helps.  And a lot of times the Harbor Freight ones are under-sized and not of uniform size.

[z_johnq]

Good morning guys,

I guess I found some issues with the valve. Please check the pic attached. At leaset the o-ring on the stem inside the valve is broken. That's all I can see. Please check for me to see if anything else in the pic looks suspicious.

I don't trust the o-rings that I got from Harborfreight, any idea where I can get the entire set of o-rings for this particular rifle?

The poppet looks fine to me. What do you think?

Thank you.

[Ribbonstone]

Happened to be playing with a Chief this AM….actually, playing with the cannibalized one and the running one.

Are some things in your pictures that don’t quite match up.  Your rear end cap looks different than either the early one I have...or the 2 year later one….but perhaps they used something different for the newest version (now would be  like 4 years later)


Anyway...the broken o-ring looks like the one that is in the vale under this brass insert.

DSCN2225 by Robert Dean, on Flickr


DSCN2230 by Robert Dean, on Flickr

Which is AFTER the poppet and should only seal for leaks around the  valve stem on firing...shouldn’t do “jack” other than when the valve is open (no storage leak, no after the shot hissing)...it just seals the valve stem during the shot. 

If I’m right, then just don’t screw down on that brass fitting more than “finger tight”...whole lot of PCP’s don’t bother to o-ring the metal stem

COULD be that broken like that, it fouled the movement of the valve stem….and kept the poppet from sealing….which might have been a cause for a leak.
.

Can say:

The fill end cap looks the same.
Valve body looks the same
Valve stem/poppet looks the same and looks healthy at this time.

[z_johnq]

Hey John,

Thanks for the quick return.

I bought the rifle in 2019, not sure if it's newer or older than yours. The pic I sent you covers almost everything related. They probably made some modification on it but I cannot say since that's the only one I have.

Again, do we have a place where I can get the entire set of o-rings for the gun? I tried PyramidAir but no luck.

From pic IMG_1343.PNG: it's the pic of the inside of action 'housing' that holds the rear end of the barrel. It's shiny, isn't it? It was not supposed to cause the damage of o-rings on the barrel. I guess it was the holes, whose edges are sharp enough to cause it. Hopefully some silicon grease should help as assembling.

It took me quite some time removing the valve and other stuff from the air tube since it was real tight. That's why I took a spring compressor (see the first pic) to do it, with frequent spray of silicon spray to protect the o-rings.

Thanks again!

[z_johnq]

Not sure why the 1st pic wasn't uploaded. Let me do it again.
Sorry.

[BigBird]

Good morning guys,

I guess I found some issues with the valve. Please check the pic attached. At leaset the o-ring on the stem inside the valve is broken. That's all I can see. Please check for me to see if anything else in the pic looks suspicious.

I don't trust the o-rings that I got from Harborfreight, any idea where I can get the entire set of o-rings for this particular rifle?

The poppet looks fine to me. What do you think?

Thank you.

Nothing wrong with the Harbor Fright orings they are 70d and you get like 10 each for around $8-$9.  Also, if you have an SAE set if one fits it may work. As long as the oring fills the gap when it is pumped up it should work. I use the.625 x .75 od orings in my .830. valve and they work.

You could go on Amazon and get a few packs that will fulfill your main orings but then youll have 100 each.

[BigBird]

Happened to be playing with a Chief this AM….actually, playing with the cannibalized one and the running one.

Are some things in your pictures that don’t quite match up.  Your rear end cap looks different than either the early one I have...or the 2 year later one….but perhaps they used something different for the newest version (now would be  like 4 years later)


Anyway...the broken o-ring looks like the one that is in the vale under this brass insert.

DSCN2225 by Robert Dean, on Flickr


DSCN2230 by Robert Dean, on Flickr

Which is AFTER the poppet and should only seal for leaks around the  valve stem on firing...shouldn’t do “jack” other than when the valve is open (no storage leak, no after the shot hissing)...it just seals the valve stem during the shot. 

If I’m right, then just don’t screw down on that brass fitting more than “finger tight”...whole lot of PCP’s don’t bother to o-ring the metal stem

COULD be that broken like that, it fouled the movement of the valve stem….and kept the poppet from sealing….which might have been a cause for a leak.
.

Can say:

The fill end cap looks the same.
Valve body looks the same
Valve stem/poppet looks the same and looks healthy at this time.

I would think a 90d oring here in the back of the valve would work better.  Have you tried that?  Im thinking it wouldnt grab as easily.

[BigBird]

Hey John,

Thanks for the quick return.

I bought the rifle in 2019, not sure if it's newer or older than yours. The pic I sent you covers almost everything related. They probably made some modification on it but I cannot say since that's the only one I have.

Again, do we have a place where I can get the entire set of o-rings for the gun? I tried PyramidAir but no luck.

From pic IMG_1343.PNG: it's the pic of the inside of action 'housing' that holds the rear end of the barrel. It's shiny, isn't it? It was not supposed to cause the damage of o-rings on the barrel. I guess it was the holes, whose edges are sharp enough to cause it. Hopefully some silicon grease should help as assembling.

It took me quite some time removing the valve and other stuff from the air tube since it was real tight. That's why I took a spring compressor (see the first pic) to do it, with frequent spray of silicon spray to protect the o-rings.

Thanks again!

I was wondering about if something was going on in the hammer area.

[CableStop]

From your original description it definitely sounds like the poppet is leaking.  If the leak gets louder when the bolts pulled back it means air is coming through the transfer port and the only way for that to happen in most guns is for the poppet to leak.  Sometimes the failure isn't as obvious as that crumbled Crosman poppet, it could still have gotten damaged from the harder hit.  Given that yours is still intact it wouldn't be too hard to copy the dimensions and make a new one out of Delrin.

[wll2506]

Anyone tried the poppet guy on eBay, just curious, I would like a few for the Chief II in case mine give up the ghost, making them is a pain and for some reason I can never get them smooth enough :-)

wll

[Back_Roads]

 
 There's a poppet guy  on Ebay

[wll2506]

 There's a poppet guy  on Ebay

Delrindepot-4

[Back_Roads]

 There's a poppet guy  on Ebay

Delrindepot-4

I see custom fit, I would assume you would send them the specs and have to fit your stem ?

https://www.ebay.com/sch/delrindepot-4/m.html?_nkw=&_armrs=1&_ipg=&_from=

[z_johnq]

Hey John,

Are you sure it's standard, not metric? The one I bought from Harborfreight is of metric (like in the previous pic attached); guess I will have to buy the standard set. It's quite inexpensive: $8 for 380 of them.

I doubt I will replace all of them, only those are broken already, since the quality of those on the gun may be better than those from Harborfreight, right?

Can you do me another favor? Would you happen to have a diagram of the rifle disassemblied?

Thanks.