Author Topic: Strange problem with 83  (Read 566 times)

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Offline calan2

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Strange problem with 83
« on: April 21, 2017, 01:56:13 PM »
I have a CZ 83 with about 700 rounds through it, that has developed a strange issue.

It has recently started experiencing hammer drop, where the hammer will follow the slide forward on firing. At first I couldn't duplicate it without actually firing a round; everything looks and feels perfect when dry firing after a thorough cleaning. The sear engages the hammer firmly, pins look good, etc.

After repeatedly dry firing it in various positions, both with and without a magazine inserted, it finally happened. After a little more experimenting, I discovered that if I push on the ejector lightly while cocking the hammer, I can cause the issue every time... otherwise it works as it should. Even knowing this, I still can't figure out what is causing the sear to not lock up the hammer. The sear spring seems to be ok, the disconnector moves up/down, the sear/hammer interface is solid (when it locks up properly), and so on. It appears to be a very minor tolerancing flaw somewhere, but I'll be damned if I can find it.

Any ideas what could be causing it? I think I'm going to order a few of the most likely culprits (sear, sear spring, disconnector, pins, etc.) from CZ USA and replace them all at once, but would like to hear from someone that has experienced this exact issue.

Offline Igrlik

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Re: Strange problem with 83
« Reply #1 on: April 22, 2017, 05:17:49 AM »
Check automatic safety. Must be firmly hold by sear spring in lower position. If moves freely, problem is sear spring. See http://www.czfirearms.us/index.php?topic=83964.0 topic.

Automatic safety

Offline calan2

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Re: Strange problem with 83
« Reply #2 on: April 25, 2017, 10:10:00 AM »
So should I buy a new automatic safety also, or do you think a new sear spring will fix the issue?

Offline Igrlik

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Re: Strange problem with 83
« Reply #3 on: April 25, 2017, 03:43:27 PM »
Just sear spring. It holds both  sear and automatic safety.

Offline calan2

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Re: Strange problem with 83
« Reply #4 on: May 21, 2017, 09:37:30 PM »
Got my parts in, and about to tackle this. Not looking forward to taking this thing down and getting it back together.

I've taken apart all of my guns and modified them, etc... but for some reason this CZ83 intimidates the hell out of me.  :)

Offline calan2

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Re: Strange problem with 83
« Reply #5 on: May 21, 2017, 10:28:58 PM »
When I look into the small hole on the top of the ejector, I can see the end of the sear spring. I can push this down with a jewler's screw driver and it catches on the left side of the frame like it's "seated" there, but it still doesn't keep the auto safety from floating around. Even if I pull the ejector/auto safety pin and wiggle the safety back and around while trying to set that spring, I can never get it to engage the auto safety.

Where exactly is that spring supposed to sit, in relation to the auto safety? It seems like it should set underneath it, to push the rear of the safety downwards...but the spring doesn't seem long enough to ever engage it this way.

 

anything