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Old 04-26-2012, 06:30 PM
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G&P M14 Gearbox problem

So I recently blew a few gears and a piston at a game in my G&P MK14. I just got some new ones this week from AirsoftArms and Airsoftsmith but I'm having trouble getting everything together.

New parts are: Classic Army Bevel Gear, G&P poly piston, and a G&P spur gear (as well as some new shims)

So I've spent the last few hours working on it, and I believe I got the shimming down good after many tries. The first problem I'm having is that no matter what I do I cannot get the whole shell to close. Everything appears to be lined up and correct but it just will not close fully. Something I think may be a problem is my tappet plate, it constantly bend ups towards the top of the shell.

A few times I've nearly gotten the thing completely shut and had all the gears in place safely and securely, but when I go to test it all I get is a loud kinda rough whurring sound.

Any help,tips, or advice is greatly welcome!
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Old 04-26-2012, 07:00 PM
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I don't have experience with the G&P MK14, but from the sounds of it, you have a motor height adjustment issue. In most M14's (CA, Echo1, clones), you can adjust the motor height with the small hex-head screw (in the grip). Can't help too much with the gearbox closing, only advice is to check the spring guide and anti-reversal latch.

Hope this helps!
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Old 04-26-2012, 07:04 PM
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Okay thanks! I'll give that a try for sure.
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Old 04-26-2012, 07:09 PM
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As far as the gearbox closing, try to adjust the cylinder when you are closing the gearbox. Use a small screwdriver and center it accordingly.
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Old 04-26-2012, 07:29 PM
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Okay will do. As to the motor height part, the G&P doesn't have a tightening ability like that, I honestly don't know how it works but there is no screw to push it closer to the Bevel.
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Old 04-26-2012, 07:34 PM
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Quote:
Originally Posted by Tactical Ginger View Post
Okay will do. As to the motor height part, the G&P doesn't have a tightening ability like that, I honestly don't know how it works but there is no screw to push it closer to the Bevel.

There has to be. You can look at your stock and see that there is a hole in it where the motor sits so you can adjust your motor without taking the gearbox out (like most AEGs)
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Old 04-26-2012, 07:42 PM
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Is it an EBR, DMR, or normal stock? Normal and DMR stocks should have the screw in the pistol grip, not sure about EBR...
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Old 04-26-2012, 07:48 PM
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It's the DMR, it has no hole in the pistol grip and the end of the motor cage just has a screw and nut system but only one of the nuts tightens and it's not the right one. It's kinda hard to explain but there doesn't appear to be a way to tighten it.
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Old 04-26-2012, 08:02 PM
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Now I got everything tighten and closed except for the very front near the Air Nozzle. I'm to afraid to plug a battery in an try it because last time I did it appeared to leave some wear on the Pinion. The Air nozzle also does not move freely at all as well.
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Old 04-26-2012, 08:07 PM
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Post some pictures man. The air nozzle should move freely. DONT PLUG IN A BATTERY
Tilt the gearbox toward your face and see if the cylinder head is up too close, then try pushing it toward the spring guide with a flat head.

Also, before you do the above, make sure the cylinder is installed correctly.
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Old 04-26-2012, 08:08 PM
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I've been trying to push the cylinder back some but it doesn't seem to want to move. Everything seems to be lined up right and in place :/

I'll work on some pics as soon as I can.

EDIT: I'm leaning towards thinking it's the tappet plate, if you bump the cylinder at all the tappet plate comes out of place and sticks up a lot which causes the Air Nozzle not to move at all.
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Old 04-26-2012, 08:35 PM
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Interesting. When you are putting the gearbox together, the air nozzle needs to be pushed towards the spring guide so the bushing on the sector gear fits together with the gearbox. If you do not do this, more than likely nothing will fit together properly. Even if the tappet plate is bent, it would still move when the air nozzle is pushed
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Old 04-26-2012, 09:31 PM
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I'm trying that but I can't get it yet :/ ,with or without a spring I can't get the gearbox to shut near the front. I'll work on gettin pics up tomorrow of it so you can judge it better.
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Old 04-26-2012, 10:24 PM
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Will somebody just beat me off already?
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Old 04-27-2012, 07:32 PM
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That's about as closed as it will go currently.


Up close of the Tappet plate and Sector


This is what happens as soon as the spring and spring guide go in. As you can see the tappet plate is rising a little bit over the sector which I think, could be the problem.
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Old 04-27-2012, 09:22 PM
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I don't no much about v7 gearboxes but from my experience working on v2 gearboxes the tappet plate normally rises like that but it won't stop the gearbox from closing
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Old 04-27-2012, 09:24 PM
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The tappet plate is definitely not the issue. The reason it does that is because of the pressure of the spring. Once the gearbox is closed, the tappet goes in place where it should.

Could you zoom out and take a picture so I can see everything?
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Old 04-27-2012, 09:27 PM
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Quote:
Originally Posted by Mechanicali98 View Post
The tappet plate is definitely not the issue. The reason it does that is because of the pressure of the spring. Once the gearbox is closed, the tappet goes in place where it should.

Could you zoom out and take a picture so I can see everything?
With the spring in or out?
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Old 04-27-2012, 09:29 PM
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with the spring out
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Old 04-27-2012, 09:35 PM
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Is this good?
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Old 04-27-2012, 09:40 PM
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There should be a spring attached to the tappet plate so it can move the air nozzle back and forth. I don't see that spring in this picture. Also when fitting the spring guide in the gearbox, make sure the notches on it securely fit where it is supposed to in the gearbox shell
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Old 04-27-2012, 09:42 PM
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I know the spring your talking about, how does it attach onto the tappet plate? Looking at it I can find no hooks or anything. Let me know if you need pictures.
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Old 04-27-2012, 09:46 PM
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http://www.youtube.com/watch?v=v2h_5LzDnQo
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Old 04-27-2012, 09:53 PM
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That's the video I've been using, I just can't get that front part of the gear box (by the air nozzle) and the part near the Bevel gear to close. When I take the shell back off everything looks aligned and in good shape though.

EDIT: I now have the air nozzle moving easily when I push on it but like I said before, I still can get it to close all the way. Could this be a shimming issue or bearing issue?
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Old 04-27-2012, 10:17 PM
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Check and see if the shimming is right, but I highly doubt you are having this problem because of that. If you thing everything is aligned, I would take a screwdriver handle and carefully hit it against the box(back end and from end).
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