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Marlin 336 Jamming

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/09/2009 at 11:30
Terry Lamb View Drop Down
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I have a 4-yr-old Marlin 336 in 30-30. With maddening unpredictability, the lever will jam solidly in the full-open position. Evidently the carrier picks up one cartridge, but then a second cartridge is pushed below the carrier, totally jamming everything up.
 
I found online that this is a sort of legendary problem with some 336s, due to some wear caused by the lever cam. Mine seems to have no evidence of such wear, yet the problem occurs. It began this fall, never having exhibited the behavior prior.
 
Has anyone any comments or experience?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/09/2009 at 16:23
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 Magazine return spring worn or broke. Looks like a trip to gun smith or ship it back to marlin.

Edited by rjtfroggy - December/09/2009 at 16:23
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/09/2009 at 16:36
Terry Lamb View Drop Down
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I pulled the spring and follower and they are in good order. In fact, had it been the spring, it might tend not to feed a cartridge at all, much less loading in two at a time. Thanks for the idea though, I am working though everything I can.
 
The problem is, it only malfunctions occasionally. I can cycle through fifty without a hitch, and then bam, it loads in that second jammer. No pattern to it.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/09/2009 at 16:46
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I would suspect that it is a retainer problem of some sort. What means are the rounds held in the magazine? I don't recall off hand. Is it a button, lever, or some other means? Either way, it sounds like that is where to look.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/09/2009 at 16:59
Terry Lamb View Drop Down
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Sure sounds like it Cy. Without more disassembly, it appears that it is actually a nub on the lever that keeps the magazine cartridges back in the magazine, but I am going to have to get inside there to see. The lever comes off easily, but it is harder to see how the carrier functions in there.
I really hoped someone with your experience could waive a marlin wand and just cure it.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/09/2009 at 17:32
rjtfroggy View Drop Down
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 Terry is all one kind of brass or is it different brands. It could be the diameter of one is a hair smaller and it is slipping past the retainer spring.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/09/2009 at 17:42
Terry Lamb View Drop Down
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It is all Hornady Leverevolution factory loaded brass, so I have discounted brass variations, which is not to say there can't be variations within brand of course. Thanks froggy.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/09/2009 at 22:31
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Trade it in for a 50 year old Marlin...........    Thunbs Up
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/10/2009 at 07:28
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I have seen a few of these. one was the ejector that just sits beside the bolt and recever in the none ported side. it wouldn't flip the case out and would lock the bolt back. Have you taken it completely apart? If you want to I can talk you thru it. the 336 is not as complicated as you would think.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/10/2009 at 07:32
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Originally posted by Bigdaddy0381 Bigdaddy0381 wrote:

I have seen a few of these. one was the ejector that just sits beside the bolt and recever in the none ported side. it wouldn't flip the case out and would lock the bolt back. Have you taken it completely apart? If you want to I can talk you thru it. the 336 is not as complicated as you would think.

my dads old 336c did that too and that was the problem with his it isnt to bad to fix.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/10/2009 at 09:33
Terry Lamb View Drop Down
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Originally posted by Bigdaddy0381 Bigdaddy0381 wrote:

I have seen a few of these. one was the ejector that just sits beside the bolt and recever in the none ported side. it wouldn't flip the case out and would lock the bolt back. Have you taken it completely apart? If you want to I can talk you thru it. the 336 is not as complicated as you would think.
No, definitely not ejector related. The jam only occurs when a second cartridge manages to exit the magazine after the carrier has lifted a round up for chambering. That second round wedges below the carrier, to the rear of the loading port, and cannot be removed or dislodged without removing the lever itself.
 
Cyborg I think has his crosshairs on the location of the problem, that is, whatever is supposed to retain a cartridge in the magazine, occasionally does not retain it when the carrier lifts. I am hoping to have time today to dissassemble further.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/10/2009 at 10:42
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Okay let us know what you find then.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/10/2009 at 13:11
Terry Lamb View Drop Down
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Well, I managed to get a look at the internals, and the magazine feed stop is accomplished soley by the carrier when the carrier is in the "up", or chamber feed, position. Looking at it, the stop lug covers fully half of the cartridge case base seemingly making it impossible for a round to feed in from the magazine below the carrier itself. And yet it has done so. Nothing appears worn, and I cannot now duplicate the misfeed, no matter how many rounds I cycle. I did give everything a complete cleaning in the process, but I continue to be as baffled as ever as to the cause, which happened twice during the season in the field.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/10/2009 at 13:33
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Are you using ballistic tipped rounds? I know the one I had hated anything that wasn't flat nosed, or round nosed. It could be that it is feeding two at the same time when you charge it too fast.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/11/2009 at 16:47
Terry Lamb View Drop Down
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Originally posted by cyborg cyborg wrote:

Are you using ballistic tipped rounds? I know the one I had hated anything that wasn't flat nosed, or round nosed. It could be that it is feeding two at the same time when you charge it too fast.
Hello borg, I am using the Hornady Leverevolution flex tips, which are pointed, but flexibly soft. These are in fact so soft that they can be readily bent with abuse. Although it seems unlikely in view of the rather large tetaining lug on the carrier, I am now trying to check the hypothesis that a severely enough crinked tip could cause enough of a case base misalignment to cause the base to angle just past the retainer and out of the magazine tube.
 
Thinking about it, many of the cartridges exhibited bent tips after being cycled and fed over and over during the course of the season by my grandson. I'll try experimenting with dog-legged tips to see if I can induce the malfunction.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/11/2009 at 22:02
cyborg View Drop Down
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Keep us up to speed there. This seems a perplexing issue, hopefully one we all can learn a little something from.
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