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 General M1/M2 Carbine Discussion
 gas piston
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winchester123
Starting Member


USA
1 Posts

Posted - 08/09/2018 :  3:45:41 PM  Show Profile Send winchester123 a Private Message  Reply with Quote
How tight should the piston nut on my Winchester be? I've had the rifle for 15 years, shot it a lot and never thought to ask the question. I can turn it by hand. Thanks.

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Jackp
Veteran Member



USA
1064 Posts

Posted - 08/09/2018 :  5:43:49 PM  Show Profile Send Jackp a Private Message  Reply with Quote
Hi and welcome to the M1 Carbine Forum from New Mexico!

The tech manual for the carbine does not specify a torque for the piston nut. It only instructs the arsenal personnel to stake the nut after assembly. I would suggest tightening it to a little more than hand tight to ensure that it has seated fully against the internal shoulder of the gas cylinder. The assembly drawing of this part just says "Stake in the places provided". These are the small openings in the recessed areas of the nut. You will be staking the cylinder, not the nut. One stake should do the trick. Check out this link for more info.

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JackP

Edited by - Jackp on 08/09/2018 5:44:54 PM
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always learning
Junior Member



USA
73 Posts

Posted - 08/10/2018 :  07:53:39 AM  Show Profile Send always learning a Private Message  Reply with Quote
Winchester gas cylinders had some fine threads or so it seems. Just be a little more careful when installing the piston and nut.
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Tuna
Moderator



3306 Posts

Posted - 08/10/2018 :  09:54:43 AM  Show Profile Send Tuna a Private Message  Reply with Quote
How far can you turn it by hand? A little bit or a lot to the point of being able to take it off? It makes a difference.
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jimb16
Moderator



USA
3150 Posts

Posted - 08/10/2018 :  8:03:28 PM  Show Profile Send jimb16 a Private Message  Reply with Quote
And don't over-tighten it. The gas cylinder is somewhat delicate and can be easily cracked.

OGCA Lifer,NRA Life member, son of a 325th GIR Glider Rider
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Tuna
Moderator



3306 Posts

Posted - 08/11/2018 :  11:31:48 AM  Show Profile Send Tuna a Private Message  Reply with Quote
Jim as usual is a 110% correct. If you crack the gas cylinder you cannot weld it back. It will not stay and will crack again. You have to replace the barrel. It's the only way. Make the nut snug but no need to be King Kong in tightening it. Now if the nut only moves a little then don't worry about it as it's most likely been staked. The nut moved a little bit as it was staked so now there is a bit of movement in it. No big thing.

Edited by - Tuna on 08/11/2018 11:34:06 AM
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