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no 5 Jungle carbine action screw torque setting?

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Toby4320 View Drop Down
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    Posted: July 24 2023 at 8:05pm
Hi all, I'm just wondering if anyone knows what the torque setting should be for the action screw on my no 5 carbine? the front handguard is a bit loose, in that it twists slightly and I'm not sure how to fix it but think checking the torque on the action screw might be a good place to start!

is there anything else I should check?

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Toby
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: July 24 2023 at 8:37pm
we would need photos to be of help , i dont know how much it twists but the wood does shrink a bit ove decades loose is a relative term here , 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shiloh Quote  Post ReplyReply Direct Link To This Post Posted: July 25 2023 at 2:16am
 I dont know the exact torque but it needs to be tight enough not to come loose while in use.
 The hand guard can be firmed up by placing a piece of card stock under the band at the top. As mentioned above the wood does dry out and shrink a bit over the decades.  Mine did the same and I used an old playing card cut to roughly skinnier than the width of the band.
 Try that and see if it helps, you could also try letting it sit in a bath of boiled linseed oil for a while, it may swell a bit making it tight again.
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britrifles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: July 25 2023 at 3:47am
The trigger guard front screw (main screw) should be firmly tight, 35 - 45 inlbs. The forend should not move on the action.  

Might want to first check if the front screw collar is installed, this prevents the wood from being excessively compressed. Over time, the wood can compress and no matter how tight the screw is, the forend can move on the action.  The fix is to shorten the collar, a bit at a time, but don’t overdo it.  You want to feel the trigger guard contact the collar prior to reaching 30 inlbs, at that point, the torque increases rapidly with little movement of the screw.  What I do to check this is remove the forend, fit the trigger guard, collar and screw.  Count the number of turns on the screw to bottom the guard on the collar.  Then refit the forend without the collar and count the turns to reach 30 inlbs. If you get more turns this way, the collar is too long.  




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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: July 25 2023 at 8:53am
One thing to add.  If you reach 30 inlbs (collar removed and forend fitted) with fewer turns on the screw than you counted to bottom the screw out on the collar w/o the forend installed, the collar is too short.  You will need to get a longer (new) collar.  

My Fulton Regulated No. 4 (prepared for SR(b) competition shooting did not have a collar fitted, and my two DCRA rifles don't either.  This was done to keep pressure on the bedding points.  On these rifles, I only torque the main screw to 25-30 inlbs and I back the screw off 1/2 turn after shooting the rifle and store it with the screw loose.  I think 45 inlbs might gradually crush the wood at the trigger guard without a collar fitted.  These trigger guards were modified by welding on a steel plate to the bottom of the guard that is flush with the wood bearing at the screw hole, so minimizing wood crush. 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Toby4320 Quote  Post ReplyReply Direct Link To This Post Posted: July 26 2023 at 5:07pm
Thanks britrifles, by collar do you mean the guard screw lock washer, part 26 in the diagram below? If so mine didnt have one, it was refurbished before i bought it though and may have been left out when put back together by whoever did it.i have since bought one tho, after installing it it did tighten up but not completely

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: July 27 2023 at 9:42am
Not quite.The washer (#26) goes in to lock the bolt & reduce turning or backing off.
There's also a "sleeve" (not shown) that goes between the action bushing & the bottom metal. Part #11 in this diagram. The washer is also shown in its correct position INSIDE the bottom metal.

https://www.brpguns.com/product_images/uploaded_images/4refj.jpg
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: July 27 2023 at 4:10pm
Thanks for this diagram, Shamu!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: July 27 2023 at 4:38pm
The item # 11 part designation in the Enfield drawing for the No. 4 (and No. 5) is “collar”.  It is essentially a spacer, it prevents the “stock, fore-end” wood from being crushed when tightening the “guard, trigger, screw, front”. 

The collar may be stuck in the forend, remove the trigger guard and you should see the collar sitting about flush with the wood.  If the collar is too tall, you will never get the forend tight on the action.

The washer under the head of the trigger guard front screw is also good to have, otherwise the screw could bottom out in the action body lug, another reason for a loose forend. 

Picture is indeed worth 1000 words.  Thanks for posting Shamu. 


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