AK Sponsor
Posted: 7/29/2011 3:21:07 AM EDT
|
My Yugo M70 has been nothing but trouble. It has always jammed since I bought it. Stove pipe jams are common so I purchased a new bolt because of the ejector possibly being warn out (Century Yugo). Here is the problem I have now, maybe I am doing something wrong: To check cycling, I place an empty shell in the chamber and let the carrier slam shut. I then attempt to pull back the action as fast as possible to mimick firing and to see how the shells are ejecting. At times the shell locks in the chamber and I cannot get the action open. Both the original bolt and new bolt do this when an empty shell is in the chamber; not always though as sometimes the empty shells eject. When it locks up, I can open the action about 3/4 of an inch, but then it locks completely. I do not understand this and wish I had not purchased an unreliable AK. I miss my Romys as they never jammed.
|
| Yes, you are doing something wrong. An empty caseing will have expanded from being fired and WILL fit tightly in the chamber just as you have discribed. Try removeing the firing pin and cycle with live unfired ammo or go to the range and point down range and hand cycle live ammo. Never cycle an empty case. The best route to test it out is just to fill up some mags and shoot it. I would also advise you replace the extractor on your original bolt from the one with your new bolt. Swapping bolts can effect headspacing, makeing the bolt lock up to tight or worse to loose. |
|
Have you checked the headspace since replacing the bolt?
AK bolts are not necessarily interchangable. If you think the original extractor (not the ejector, which is part of the receiver) or extractor spring is worn, swap the extractor and spring from the replacement bolt into the original bolt and test the rifle. I would advise you NOT to fire the rifle with the original bolt until the headspace has been checked and found to be correct. The rifle could be damaged and/or you could be injured if the headspace is incorrect. |
|
Quoted:
Have you checked the headspace since replacing the bolt? AK bolts are not necessarily interchangable. If you think the original extractor (not the ejector, which is part of the receiver) or extractor spring is worn, swap the extractor and spring from the replacement bolt into the original bolt and test the rifle. I would advise you NOT to fire the rifle with the original bolt until the headspace has been checked and found to be correct. The rifle could be damaged and/or you could be injured if the headspace is incorrect. This. I wouldn't fire it with the new bolt either. You need to check your headspace. |
| First thing to do is get yourself some snap caps or you can just take the powder out of some shells and blast the cap then super glue the bullet back on on about 5 rounds and test them in a mag to see your rifle is cycleing right then make sure you headspace it since you installed a new bolt before you can take it out to the range.....I have blanks I usually test to make sure the pin and bolt lock in place and fires a round... but unless you have an adapter for blanks you can not test the action...... |
| The new bolt is from a Hungarian AMD 65 ordered from Apex. I have fired the rifle with a Romanian bolt and it functioned fine. I test tomorrow at the range. The best I can do is compare all spaces and tolerances with a caliper tonoght as I do not have access to a go/no-go gage. |
| I have researched this gun for 6 years and it is amazing that I still don't know everything about it. From what author Patrick Sweeny of Guns and Ammo fame says is that Communist countries don't check for proper tolerance in their weapons. After checking all surfaces, locking lugs, and space between the bolt and barrel with a caliper, all measurements are the same except for about .02 of a millimeter in some areas. One other idea, I noticed the recoil spring is really hardcore on the Yugo when compared to the Romanian variants I have owned. Maybe this would account for the stove pipe jam? How about removing a few coils on the spring? I understand this part helps the bolt carrier return and load another round so this would have to be precise. Hey, on second thought who wants to trade me their Romanian AK for my Yugo. Only 100 rounds fired! Beautiful condition too, straight sights, non-pitted original barrel (CAI import markings). |
|
Quoted:
I have researched this gun for 6 years and it is amazing that I still don't know everything about it. From what author Patrick Sweeny of Guns and Ammo fame says is that Communist countries don't check for proper tolerance in their weapons. After checking all surfaces, locking lugs, and space between the bolt and barrel with a caliper, all measurements are the same except for about .02 of a millimeter in some areas. One other idea, I noticed the recoil spring is really hardcore on the Yugo when compared to the Romanian variants I have owned. Maybe this would account for the stove pipe jam? How about removing a few coils on the spring? I understand this part helps the bolt carrier return and load another round so this would have to be precise. Hey, on second thought who wants to trade me their Romanian AK for my Yugo. Only 100 rounds fired! Beautiful condition too, straight sights, non-pitted original barrel (CAI import markings). You cant measure headspace with a caliper. Just because the gun fired with the new bolt (and even the old bolt for that matter) doesnt mean that the firearm is safe to shoot. Definitely check the headspace, especially with the new bolt. How about trying another recoil spring first, before cutting things? See if you can borrow someone else's if you don't have another rifle to trade it with. You still didn't answer some of our questions though. Does it cycle manually with snap caps/dummy ammo? Do those rounds eject properly when cycled by hand? If it cycles manually and rounds eject, but they do not eject when firing live ammo you might have a gas port/gas block issue. Meaning that the rifle isn't getting enough gas to fully cycle the bolt carrier. I've had this happen and it usually causes stove pipe jams, and problems stripping a new round off the magazine. |
| How would one check headspace without an g/no-go gage? I do not own snap caps in 7.62x39. I was thinking the gas system could be a problem because of the gas cutoff in the Yugo AKs. I have heard that the feature which allows this function can rust while inside the gas block. |
|
Quoted:
How would one check headspace without an g/no-go gage? I do not own snap caps in 7.62x39. I was thinking the gas system could be a problem because of the gas cutoff in the Yugo AKs. I have heard that the feature which allows this function can rust while inside the gas block. To check headspace you need gauges. Right tool for the job. If you have a local gunsmith they might have them. Other than that... order some online. 60$ to prevent a rifle from exploding is worth it IMHO. You can always sell them when you're done. Also might be worth while to check the hometown forum for your state. Somebody else might have some locally you could borrow (and maybe help you diagnose the problem locally) Since you don't have snap caps, you could strip the bolt and try cycling live rounds without the firing pin installed. Alternatively, you could take a pliers, pull bullets out of a half dozen cases, dump the powder out, push the primer out, and then push the bullets back into the cases to create some dummy rounds. Either way would be a safe method to test function by hand cycling. You could check the gas block opening too, remove the bolt carrier and take the gas tube off. Then using a drill bit (I think .1285" is the correct size, you might try some a little smaller) put the drill bit through the gas block and into the gas port on the barrel. You should be able to see the bit hit the bottom of the barrel. If not, the gas system could be the problem. Hope that helps, let us know how it cycles by hand and we can help further diagnose it. Good luck! |
| Thank you everyone! I believe I have the problem solved. I fired the rifle today and the 5th round stove piped with the new bolt. So... probably not the extractor. I had a friend fire it and two rounds fired full auto(so stove pipes and trigger not re-setting all the way). I know what it is now. The Yugo has a beefed up recoil spring. I will buy a Romanian recoil spring assembly and switch out the springs only while using the original Yugo guide assembly. |
| Thrid world countries usually dont advertise their accdents as we do here in the usa... I personally wouldnt just fire a gun with out checking headspace and moreso if it kicks like a mule since if the bullet is expanding behind the chamber your going to feel it in the bolt and more kick towards the back of the gun....I value my fingers and my face to much....I wounder how many guns in Kyber acutually get turned down and not sold due to quality control issues... I think if they fire they sell........ |
| Kyber pass copies! I read about those in last years edition of Guns and Ammo's AK-47 special edition. The funny thing is that my Yugo hardly kicks at all (when it's functioning that is). The gun itself is one of Century's best. Quality and craftsmanship are nearly perfect; just the recoil spring is too heavy. I don't know why the Yugos used such a beefed up spring. Maybe their country's ammo is hot or equivelent to +P or something? |
AK Sponsor