Garand gas cylinder and lock screw threads don't match...

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smeagol

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Maybe because it is so late, but just cleaned up some parts I got today from Numrich and noticed that the threads inside the gas cylinder are way too large and the tube seems to be too large as well, so the gas cylinder lock screw won't thread on (big sloppy hole, large threads, fine threads on the lock screw). It's like throwing a sausage down a hallway!

WTF?? Am I missing something? Time for bed because I have scratched a hole in the top of my head wondering...

plug.jpg
 
smeagol said:
Maybe because it is so late, but just cleaned up some parts I got today from Numrich and noticed that the threads inside the gas cylinder are way too large and the tube seems to be too large as well, so the gas cylinder lock screw won't thread on (big sloppy hole, large threads, fine threads on the lock screw). It's like throwing a sausage down a hallway!

WTF?? Am I missing something? Time for bed because I have scratched a hole in the top of my head wondering...

plug.jpg
Click to expand...

WTF is right. The plug looks fine, but that GC looks like it dropped the soap in prison. Might want to return in to Numrich.
 
ipscgraz said:
Even if it was the right size yuo have fine threads on the cylinder and extra fine on the plug...
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Were the gas cylinders and plugs made with two different size threads at different times? I searched around and couldn't find anything saying that was the case and all the plugs I have seen seem to have the extra fine threads...

Email sent to Numrich to start an exchange...
 
smeagol said:
Were the gas cylinders and plugs made with two different size threads at different times? I searched around and couldn't find anything saying that was the case and all the plugs I have seen seem to have the extra fine threads...

Email sent to Numrich to start an exchange...
Click to expand...

The threads in both gas cyclinder I received yesterday are not like yours.

If you need one quick, I have one extra.
 
sgmacken said:
WTF is right. The plug looks fine, but that GC looks like it dropped the soap in prison. Might want to return in to Numrich.
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If I sent the gas cylinder back with a soap on a rope attached and no note explaining, do you think Numrich would be able to figure out what the problem was? hahaha
 
The threads on the following components are all 9/16-32NS; gas cylinder, gas cyl lock, gas cyl screw/plug, and barrel threads at the muzzle end. If a person plays around with Garands enough you will probably find it useful to get a tap and die set of this dimension. I've used the die to chase the barrel threads on a number of used and new barrels (sometimes the splineway cuts on a new barrel can be burred or deformed). The lock and screw are hardened and tend to become deformed to a lesser extent than do the "softer" threads on the barrel. I have needed to use the tap to clean up threads on a few gas cylinders. As with any tap/die use cutting fluid on the working surfaces/threads.

The military used a combination tap/wear gauge to both clean up the threads on the gas cyl and to gauge it for internal wear. You can get a commercial copy of these for around $100 from Brownells. I've never bothered with this as the standard tap works fine to clean up the gas cyl threads and a fired belted magnum case inserted backwards in the rear of the gas cyl is a useful "poor man's" internal wear gauge.

From the looks of the pic I'd be inclined to return it for a replacement. Used parts are often a crap-shoot, especially from Numrich or Sarco. Gas cylinders are a high wear component, so newer is better.
 
It looks bulged on the outside dimension. My guess is it was on a gun that went K-B before it was scrapped for parts. Send it back as unserviceable and get a replacement IMHO.
 
Claven2 said:
It looks bulged on the outside dimension. My guess is it was on a gun that went K-B before it was scrapped for parts. Send it back as unserviceable and get a replacement IMHO.
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Claven, you'd know the answer to this: Do I just pack it up and ship it back to Numrich and they take care of the rest? Do you know if they refund shipping for exchanges?
 
"...cylinders and plugs made with..." Nope. Somebody buggered up the gas cylinder lock. The threaded part should come off. Needs to be replaced. $25 from Marstar.
"...a tap and die set of this dimension..." That won't help in this case. The lock is damaged.
 
smeagol said:
Claven, you'd know the answer to this: Do I just pack it up and ship it back to Numrich and they take care of the rest? Do you know if they refund shipping for exchanges?
Click to expand...

You eat the shipping, but no need to call - there should be a form in your parcel for just this purpose.
 
sunray said:
"...cylinders and plugs made with..." Nope. Somebody buggered up the gas cylinder lock. The threaded part should come off. Needs to be replaced. $25 from Marstar.
"...a tap and die set of this dimension..." That won't help in this case. The lock is damaged.
Click to expand...

Sunray, are you saying the GC lock screw is messed up? Looks fine to me... Isn't it the inside of the gas cylinder where the lock screw threads into the part that is messed?

And what threaded part comes off? Colour me more confused!
 
NO. The plug is fine, it's your cylinder that is f@cked. It's unserviceable and should not be used under any circumstance - send it back.
 
Just got off the phone with Numrich, I also had an issue with the bullet guide - it was pushing the follower arm pin off center. They said don't worry about sending them back, just toss them out and they are shipping replacements today, no extra charges. How's that for customer service?!
 
It either means they trust your word that they were crap or they knew they were crap. The cynic in me believes the latter.

Either way let us know how the replacement parts look!
 
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