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Old 03-09-2017, 03:51 PM
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Default M1 Carbine Piston Nut

I don't know where to post this question, so I guess it goes here.

I have an Auto Ordnance M1 Carbine, and the piston nut keeps backing off after shooting around 50 rounds. I've never tightened it excessively, but always good and tight. I even added some blue loctite to keep it in place, but that only lasted about 200 rounds. It came from the factory staked, but apparently it never took. I can usually turn it with my fingers after shooting, and when it starts to tighten up, you can feel a little drag or "click" and then I have to use my piston nut wrench to tighten any further.

I'd like to re-stake it, but I'm unsure of how to do it without causing more harm than good. Can anyone here kinda walk me through it.
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Old 03-09-2017, 04:40 PM
gonerydin gonerydin is offline
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I know nothing but I found what appears to be good instructions on YouTube.
M1 Carbine Gas Piston Removal/Installation - YouTube


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Old 03-09-2017, 05:16 PM
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Thanks, but I've already watched that one. They do a good job of explaining right up to the point where it's supposed to be staked and then stop short. I've got a pretty good idea of what needs to be done, I just don't want to mess something up.
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Old 03-09-2017, 07:28 PM
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Staking is the correct method. TM 9-1276 is very thorough in its discussion of carbine gas cylinder, piston, and nut maintenance, but provides very little guidance on staking the nut: "Make certain to stake the cylinder lightly into the nut, in one of three places provided or the nut may work loose during firing of the carbine." I have never done it, but if I needed to, I would use a sharpened and hardened small diameter punch. I'm surprised that Loctite doesn't work.
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Old 03-09-2017, 08:14 PM
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Quote:
Originally Posted by DWalt View Post
Staking is the correct method. TM 9-1276 is very thorough in its discussion of carbine gas cylinder, piston, and nut maintenance, but provides very little guidance on staking the nut: "Make certain to stake the cylinder lightly into the nut, in one of three places provided or the nut may work loose during firing of the carbine." I have never done it, but if I needed to, I would use a sharpened and hardened small diameter punch. I'm surprised that Loctite doesn't work.
Me too. When it got loose this time, and I took it back apart, the blue thread locker was completely gone. I could feel something slimey on the nut and piston, and it smelled like silicone or something. Do you think the loctite may have gone bad? I have had it for two or three years in a kitchen drawer.
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Old 03-09-2017, 08:34 PM
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Maybe the nut and cylinder get too hot. Don't know if there is such a thing as high temperature Loctite, I doubt it, and not sure I would use it if it did exist. Note that the TM instructions state that: Make certain to stake the cylinder lightly into the nut
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Old 03-09-2017, 08:50 PM
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I just looked up expiration dates on loctite. The package says it has an expiration date of one year from the date of shipment. After further digging, it says that Cyanoacrylate degrades over time unless refrigerated, and probably should be discarded after two years. Mine was probably three years old, and God only knows how long it had sat in the local auto parts store before I bought it. Maybe I'll try the loctite again with a fresh tube before I attempt staking the nut.
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Old 03-09-2017, 10:12 PM
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Quote:
Originally Posted by Mr_Flintstone View Post
I just looked up expiration dates on loctite. The package says it has an expiration date of one year from the date of shipment. After further digging, it says that Cyanoacrylate degrades over time unless refrigerated, and probably should be discarded after two years. Mine was probably three years old, and God only knows how long it had sat in the local auto parts store before I bought it. Maybe I'll try the loctite again with a fresh tube before I attempt staking the nut.


Blue loctite (242) is only good for 300F. Red loctite (271) is good up to 450F. Recommended shelf life is 24 months from date of manufacture. Neither contain cyanoacrylate. That is superglue. You can find all the specs on loctite products.com


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Old 03-09-2017, 10:30 PM
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No need for loctite and I doubt it will hold up long in that use even if new (that housing gets HOT when firing). Staking the nut is fairly simple and I have done it on more than one carbine over the years. Use a small, sharp center punch, once the nut is screwed in properly, place the punch on the housing next to one of the notches in the nut and give it a good tap. It only needs to move enough metal to lock the notch to the housing. If unsure tap it again.

Normally only need to lock one notch though I have encountered a few carbines that looked like someone went hammer happy on the nut and were determined that it certainly wasn't going to come loose by accident!
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