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Yugo SKS 'won't cycle' fix

Discussion in 'Gunsmithing and Repairs' started by Firehand, Dec 15, 2005.

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  1. Firehand

    Firehand Member

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    Bought a 'shooter grade' SKS a while back to do some work on, and found it had a problem I've heard some about; the action either doesn't cycle at all or only partially cycles due to gas leakage at the gas valve/gas tube junction.

    Just to try it, I put an o-ring on the lip where the valve body fits into the tube, and it cycled and threw brass like a frat boy tossing an empty bottle. For about 35 rounds, at which point the ring disintegrated. I checked around and found that new valves are hard to come by, so tried something.

    Took a piece of thin steel flat stock and cut off a thin strip. Bent into a ring that, when placed in the lip and the tube installed, would spring enough to butt the ends together. Had to try/sand/try to get a thickness that would allow the tube to fit without being too loose.

    It works great. The action doesn't cycle as hard as with a tight-fitting valve & tube, but I've got about 100 rounds through now with no failures, and aside from some powder fouling the seal ring is holding up fine. I'd think the thickness/width of the ring would need to vary according to the wear/corrosion of the parts on the individual rifle; in some cases a simple ring made of wire would probably take care of it, with some it would need a thicker/wider ring.

    So if you've got one of the 'rode hard and put away wet' rifles, might give it a try.
     
  2. scott.cr

    scott.cr Member

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    Ah, good job on the DIY. I had this same problem but purchased a small copper washer to seal it. IIRC, I bought it from smallparts.com; only ordered one because they weren't as cheap as I was hoping. You might be able to find a suitable washer either from an auto parts store or from a 1988-1991 Honda Civic fuel filter banjo bolt test port.
     
  3. Firehand

    Firehand Member

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    Being laz-, er, energy conservative, I decided to try it with what I had handy.

    Good information on the washers, I'd wondered if there was one out there that'd fit.
     
  4. mrmeval

    mrmeval Member

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    Have a part number or will it vary a bit?

     
  5. TheDeeR

    TheDeeR Member

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    yugo sks cycling problems

    I recently purchased a yugo m59/66 and have had many problems with it. first trek out in the woods it wouldnt cycle and the chamberd rounds kept getting stuck. after this i recleaned it and found i had overlooked the gas chamber as i know nothing about guns lol. so i cleaned it out with oil and solvent now its all shiney and cosmoline free but still the rounds wont cycle and usually get jammed or stuck. everything looks fine but im beginning to think i have a gas leak. how do i determine if i have a gas leak?
     
  6. mrmeval

    mrmeval Member

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    It's a common problem.
    SKSBoard fix
    http://www.sksboards.com/forum/viewtopic.php?t=4191

    THR Fix
    http://www.thehighroad.org/showpost.php?p=257007&postcount=9

    Gunandgame
    http://www.gunandgame.com/forums/archive/index.php/t-943.html

    03-27-2002, 02:49 PM
    THE FIX! Disclaimer: I take no responsibility for anything, anywhere, anytime. Read and do at your own risk.

    YES, I found a fix! I took a good length of stainless (thin) wire, single strand, uninsulated, and wrapped it around the gas port valve "nipple" again and again. It took a little (very little) effort, but fit the gas rod housing and keep wrapping until you have a nice tight fit.. Twist the ends off, pack them down into the crease and GO! I had that ole' Siminov spittin' out dead WOLF puppies like it should! You might be able to use a single strand from an electric cord if you cant find very thin stainless wire. Make it nice and long though, I needed a lot to form a nice seal.
    JDW
    http://www.gunandgame.com/forums/archive/index.php/t-22220.html
    davjed
    10-04-2004, 02:38 PM
    Bought an old worn Yugo that would not cycle. Got suggestions that it was a gas leak and saw an article about wrapping wire around the gas valve nipple to seal where it meets the gas tube. This worked to some extent but decided to look for a better fix. Found a thin 1/2 inch split washer in my washer collection that just fit around the gas
    valve nipple and into the flange on the gas tube. It looked like it was made for that purpose. After that modification it shot 58 out of 60 with the two jams being failure to feed properly and not short cycles. I suppose a 1/2 stainless steel snap ring would also serve the purpose. If you're having problems with gas leak try this at your own responsibility and with care. It worked for me. The attached picture shows the washer at the red line.

    Kalishnicrazies. :)
    http://kalashnikov.guns.ru/wwwboard/board3/messages/3583.html
    I found someone that claims to have fixed the gas problem
    and their Yugo is a semi-automatic once again. He took a
    paperclip (or wire will work) and wrapped it in the ring
    (or indention)that goes around the end of the switch that
    releses the pressure for the granade launcher. I haven't
    tried it yet (so it's at your own risk) but he says it
    works for him. I'm going to try it and I'll post the
    results. Maybe something else would work. If there were
    some type of seal or o-ring that wouldn't melt...?

     
  7. johannabartley

    johannabartley Member

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    I only needed to get cheap frigidaire parts to repair mine but you can try the site for what other accessories and parts you need to fix your appliances. I hope this helps and I hope you'll help me as well when my washer or dryer dies on me.
     
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