+ Reply to Thread
Results 1 to 3 of 3

Thread: SVT-40 Gas Piston Removal

Click here to increase the font size Click here to reduce the font size
  1. #1
    Member togor's Avatar
    Join Date
    Apr 2009
    Last On
    01-21-2020 @ 10:55 PM
    Posts
    38
    Local Date
    01-23-2020
    Local Time
    02:10 PM

    SVT-40 Gas Piston Removal

    Have a SVT-40 with a gas piston that does not want to come off. Yes I have a Sovieticon-era wrench for it, but I am hesitant to apply too much torque lest the head of the piston snap off like an old bolt. There have been extended periods of kroil, but so far no luck. I am hesitant to shoot it because this is a non-rebuilt gun with an early stock with the thin wrist that has already had cracks repaired. I can leave it as-is if it comes to that but would prefer to get the piston loose so as to properly clean that area of the gas system and leave the gun a little better off for whomever owns it after me.

    Suggestions appreciated, even though I'm guessing there is no magic bullet for this one.

  2. # ADS
    Friends and Sponsors
    Join Date
    October 2006
    Posts
    All Threads
     

  3. #2
    Really Senior Member Ridolpho's Avatar
    Join Date
    Jan 2012
    Last On
    01-15-2020 @ 01:42 PM
    Location
    Province of Alberta, Canada
    Age
    62
    Posts
    1,019
    Local Date
    01-23-2020
    Local Time
    01:10 PM
    togor: I routinely use a longer wrench than the original Sovieticon tool to break loose tight ones. The pistons have quite thick walls and unless very badly corroded I can't picture one breaking unless a very large amount of torque is applied. I would set the front sight base up in a vice with brass blocks so that you can get some good torque applied to the piston. You could also heat up the gas block with a good hot air gun (I doubt you'd want to risk the finish with a flame). Only you can judge if you need to give up trying to get it off but, if it were mine, I'd make a maximum effort as there may well be active rust in there. On another note, when you say the stock has been repaired, do you mean the standard Soviet method with pins through the wrist?

    Ridolpho

  4. Avoid Ads - Become a Contributing Member - Click HERE
  5. #3
    Member togor's Avatar
    Join Date
    Apr 2009
    Last On
    01-21-2020 @ 10:55 PM
    Posts
    38
    Local Date
    01-23-2020
    Local Time
    02:10 PM
    Thread Starter
    Quote Originally Posted by Ridolpho View Post
    togor: I routinely use a longer wrench than the original Sovieticon tool to break loose tight ones. The pistons have quite thick walls and unless very badly corroded I can't picture one breaking unless a very large amount of torque is applied. I would set the front sight base up in a vice with brass blocks so that you can get some good torque applied to the piston. You could also heat up the gas block with a good hot air gun (I doubt you'd want to risk the finish with a flame). Only you can judge if you need to give up trying to get it off but, if it were mine, I'd make a maximum effort as there may well be active rust in there. On another note, when you say the stock has been repaired, do you mean the standard Soviet method with pins through the wrist?



    Ridolpho
    Hi Ridolpho,

    Kroil and hot/cold have been applied, so far without the piston coming loose. More of the same may take a long time, but patience is necessary. The gun is slightly unusual, an all matching, non-rebuilt piece. Even the stock matches, although at one time bubba slathered some varnish on it after sanding it down a bit. Rick boreckyicon did some extensive glue repairs at the wrist and forearm.

    But it is a war veteran and the metal is in good original shape. So to complete the project I'd like to fully service the gas piston, if possible, and figure out what to do about the stock finish. Original Tula '41 finish is long gone, so now it's bare wood on the exterior (although the wood still has the asphalt smell). I may just use a few coats of raw linseed oilicon and call it good at this point. Unless someone has a bottle of VK-1 they don't need.

+ Reply to Thread

Similar Threads

  1. M1C - Gas Piston Nut
    By ppknut in forum M1/M2 Carbine
    Replies: 7
    Last Post: 03-11-2012, 01:10 AM
  2. Gas piston nut, help?
    By Garandrew in forum M1/M2 Carbine
    Replies: 0
    Last Post: 01-01-2011, 09:17 AM
  3. Gas piston nut
    By bearhunter in forum M1/M2 Carbine
    Replies: 0
    Last Post: 11-27-2010, 03:08 AM
  4. Gas Piston
    By rocky321 in forum M1/M2 Carbine
    Replies: 4
    Last Post: 11-07-2010, 12:08 AM
  5. M1 garand gas piston
    By 38wadcutter in forum M1 Garand/M14/M1A Rifles
    Replies: 1
    Last Post: 09-05-2010, 07:33 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts