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Old 08-09-2005, 09:27 AM   #1
 
Join Date: Jan 2004
Posts: 407
How do I install a gas piston?

I have a Winchester M1 Carbine and when it shoots it will only fire one shot at a time.

I removed the stock and discovered that the gas piston? is gone on it.

How do I install one correctly? I have a gas piston nut wrench, but can anyone provide me with step by step instructions?

Where can I get the part or parts also?
Ridge Runner is offline  
Old 08-09-2005, 10:01 AM   #2
 
Join Date: Nov 2002
Posts: 1,116
You'll need a piston and retainer nut set. Take this opportunity to clean the gas plug threads, interior and gas port into the barrel. Examine the gas lug closely for cracks. Test-thread the nut into the gas plug to make sure the threads are okay, and chase the threads if they're not. Once the nut threads in okay, take it out and put the piston in it and thread the assembly back in. Either use Loctite on it or figure on staking it in place once it's snug. Do not overtighten, as you will crack the gas plug. Go maybe 1/4 turn past finger tight. The staking and/or Loctite keeps it from shooting loose. After you get it right, put the wrench in a very remote place and forget where that place is. Every time you clean the carbine in the future, just try the nut with your fingers to make sure it's still snug.
Inland44 is offline  
Old 08-09-2005, 11:10 AM   #3
 
Join Date: Jan 2004
Posts: 407
What?

Quote:
Originally Posted by Inland44
You'll need a piston and retainer nut set. Take this opportunity to clean the gas plug threads, interior and gas port into the barrel. Examine the gas lug closely for cracks. Test-thread the nut into the gas plug to make sure the threads are okay, and chase the threads if they're not. Once the nut threads in okay, take it out and put the piston in it and thread the assembly back in. Either use Loctite on it or figure on staking it in place once it's snug. Do not overtighten, as you will crack the gas plug. Go maybe 1/4 turn past finger tight. The staking and/or Loctite keeps it from shooting loose. After you get it right, put the wrench in a very remote place and forget where that place is. Every time you clean the carbine in the future, just try the nut with your fingers to make sure it's still snug.
What does "chase the threads" mean?
Ridge Runner is offline  
 
Old 08-09-2005, 12:01 PM   #4
 
Join Date: Sep 2002
Posts: 1,318
Use the same type tool that made the threads. Run it in and back out to clean the threads like new. The tool is a specal 1/2-32 tap usually found only in large tool houses. I just ordered two from McMaster-Carr for $24.22 ea. + tax+ shipping.
Use a brass bore brush and bore cleaner and go round-and-round (not in and out) to clean the threads before you reinstall a gas piston nut.
Bolo-7 is offline  
Old 08-09-2005, 12:51 PM   #5
 
Join Date: Nov 2002
Posts: 1,116
"What does "chase the threads" mean"

You may want to consider having this job professionally done.
Inland44 is offline  
Old 08-09-2005, 02:34 PM   #6
 
Join Date: Nov 2004
Posts: 2,207
its not really that difficult...you just need to make sure there are no burrs and that there is no smal metal debris in the threads because once you tighten it, any of that stuff will cause a bind and then damage the threads. It is probably a good idea to do what bolo says first whether it needs it or not.
Audie is offline  
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