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Diana 52

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(@bf1956)
Wisconsin
Joined: 7 years ago
Posts: 535
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Cocking arm... when near peek compression is it normal for piston rod to flex on closing?


   
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marflow
(@marflow)
Washington
Joined: 7 years ago
Posts: 1626
 

the cocking rod that is connected to the cock handle is one tough piece of steel 

so the thought of it flexing is hard to imagine 

so what you write makes no sense 

as you cock the gun the anti-bear trap holds the cocking lever at where ever point you are, at on the cock of the gun and when fully cocked the cocking lever and rod have no pressure whatsoever the trigger group is holding the piston 

so you either have a problem or the description is  not understood 

the rod cannot be bent or flexed when pulling back and none at closure 


   
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straitflite
(@straitflite)
Ohio
Joined: 7 years ago
Posts: 771
 

Trying to recall the one I had in the mid ‘80’s..

I think the rod on mine was threaded with adjustable nuts. I believe it was supposed to maintain a cant towards the receiver along its length when closed. The backwards cant is what held the cocking arm closed.


   
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(@hector_j_medina_g)
Maryland
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@bf1956 

Yes, it is normal for it to "Flex" a LITTLE.

You should adjust the LENGTH of the cocking linkage rod by releasing the lock nut and the rear attachment to the lever, and then screwing in for a shorter rod, or unscrewing it for a longer rod. You can only adjust by ½ turns, so you will need to check when the compression of the breech seal is good enough.

The ideal adjustment is when the breech seal makes contact with the breech when the cocking lever is about 1¼-1½" away from full closure.

Depending on the seal you have (DIANA, Ozzy, Vortek, or other), you might need more or less. The test is simple:

With and UNCOCKED and UNLOADED rifle, blow with all your lung power into the muzzle. If you have a muzzle piece without O'Rings, you may need to remove this muzzle piece for the test. And hold it there for a few seconds, you should feel no pressure reduction. This will tell you if the breech seal and the adjustment is good.

Now, COCK the gun BUT DO NOT LOAD it!, and repeat the test. This will tell you if the piston seal is good or not.

AGAIN, BE VERY CAREFUL!!!!! No one can be responsible for what YOU do.

 

HTH, keep well and shoot straight!

 

 

 

HM


   
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marflow
(@marflow)
Washington
Joined: 7 years ago
Posts: 1626
 

okay GUYS the question makes no sense 

Cocking arm... when near peek compression is it normal for piston rod to flex on closing?

near peak compression is back and closing is forward and forward there should be nothing stopping the gun from closing 

if the rifle linkage was so far out, that it is hard to close, it would never been closed 

correct me if i am wrong a function rifle doesn't need linkage adjustment, linkage adjustment is done when and if he rifle has been rebuilt or disassembled

could he be pushing against the bear trap, that would make no sense but it would fit the description

hell i don't know  


   
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(@bf1956)
Wisconsin
Joined: 7 years ago
Posts: 535
Topic starter  

@marflow gall darnit should have prove read. Fully cocked and when returning the lever to almost closed the rod bends slightly out wards. Lever lays down nicely. Just noticed recently and didn't recall it behaving that way. I am a senior, so I do have those moments. Thanks Fella's


   
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(@hector_j_medina_g)
Maryland
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@bf1956 

Glad it worked out.

Keep us posted!

 

 

 

HM


   
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(@bf1956)
Wisconsin
Joined: 7 years ago
Posts: 535
Topic starter  

@hector_j_medina_g 

As you well know this evaluation takes the utmost of attention. The cocking lever is 3-4in. From home upon closing. How did this occur seemingly like over night. So I look at breech seals but don't see any. This is as far as I got. To many irons in the fire. Will keep you posted, thank you.


   
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(@hector_j_medina_g)
Maryland
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Joined: 7 years ago
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It sounds to me like you got a pellet stuck between the face of the compression chamber and the breech block.

It happens when a pellet falls from the chamber but stays within the mechanisms tube.

Just an idea.

 

 

 

 

 

HM


   
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(@bf1956)
Wisconsin
Joined: 7 years ago
Posts: 535
Topic starter  

@hector_j_medina_g 

I thought of that, however I can't see it. Or will it be hidden? 


   
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(@hector_j_medina_g)
Maryland
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@bf1956 

It could hidden, so smushed up that only a thin leaf remains.

Your best bet is to cock the gun and look into the nooks and crannies with a flashlight.

Sometimes, those "pellet shrapnels" hide in the holes of the face of the compression chamber, so, at some point in time, you will have to disassemble the rifle and check it all over.

 

Sorry that this happened to you.

 

Keep well and shoot straight!

 

 

 

 

HM


   
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