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April 21st, 2006, 19:50 | #1 |
MP7 Problem, Gear Timing
I got my MP7 when they first came out, and I bought it new. Since day one though, it's had some troubles. When firing on full-auto, the BBs would usually just drop out of the barrel and fly about ten feet. Semi-auto was better but it would often have the same problem. Not all the time though, which is strange. Now, when it does this, the gun sounds like it's dry firing. This makes me think that the nozzle is retracted when the piston moves forward to push the air out of the cylinder.
So, I took the gun apart, and upon inspection of the gearbox I have found that the gear timing apears to be off from the factory, since the nozzle was about half way back at 'zero'. After opening the mechbox, I also found that the damping foam on the cylinder head was partially torn, and there was a chunk that was about to break free. I removed all the damping foam, since the asymetric nature of the torn foam would probably affect accuracy. That's a minor detail though. The main issue here is ger timing. So: Has anyone here had similar issues? How did you fix it? Any thoughts or theories?
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April 21st, 2006, 20:39 | #2 |
So, how did you fix the "timing problem"?
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Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy. |
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April 21st, 2006, 21:25 | #3 |
It only did that to me when the battery was weak.
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April 21st, 2006, 21:34 | #4 |
A Total Bastard
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In my experience, there is no such thing as "gear timing". The gears reset to "zero" after the completing one cycle.
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VINCITE OMNIMODO
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April 21st, 2006, 22:18 | #5 |
I dont know how many times people have to say it, but, THERE IS NO SUCH THING AS GEAR TIMING. If you have any mechanical sense whatsoever, this should be very evident the first time you take a mech box apart. Your problems are coming from somewhere else.
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April 21st, 2006, 23:39 | #6 |
LOL
Anyhow yeah I had the same problem with mine. till I lubed up the mags and fires great now |
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April 22nd, 2006, 16:15 | #7 |
No such thing as gear timing? Maybe I'm not explaining this right... Sorry if my terminology is off here.
I'll put it together again with the loading nozzle/tappet plate all the way forward, i.e. the sector gear is not actuating the tappet plate at all.
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...and she's terribly partial to the periwinkle blue. |
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April 23rd, 2006, 05:38 | #8 |
OK, re-assembled the mechbox today, did a test run, and for some reason the piston got completely chewed. The entire first tooth is cracked off. No idea why, although I have heard of other people chewing up MP7 pistons.
This is really getting frustrating...
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...and she's terribly partial to the periwinkle blue. |
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April 23rd, 2006, 05:53 | #9 |
Just to add another .2 cents - when i first got mine, I had issues with BB's just plopping out or firing wildly. Same as Blastyman mentions, I tried a little silicone spray in the loading rod before filling it with BB's, which in turn lubed up the mag, its been 100% ever since. Hope it helps! (after you get a new piston...)
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May 3rd, 2006, 06:46 | #10 |
[bump]More input anybody?[/bump]
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...and she's terribly partial to the periwinkle blue. |
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May 3rd, 2006, 21:14 | #11 | |
Quote:
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February 5th, 2007, 21:25 | #12 |
Nic,
Did you ever get this fixed? I seem to have the same issue. EDIT*** Hummm, I cleaned out the berrel and lubed it up some more. Seem to be working better now. Man this gun is worse than a woman.
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Last edited by oOMuDOo; February 6th, 2007 at 08:30.. |
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July 18th, 2007, 08:45 | #13 |
All aep's suffer from the same problem.
When ever the, not feeding / bb's dopping / no distance or power thing comes up... Just fill a mag with bb's, put a few drops of light weight silicone oil on the top bb in the mag. Presto, problem solved. As for the chewed piston.... that sux. Sorry.
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"Banning firearms to prevent criminal use of guns is about as smart as banning marriage to prevent spousal abuse, or banning pregnancy to prevent child abuse. " "When just seconds can mean life or death, the police are just minutes away" "If you can read this, thank a teacher... Since it's in English, thank a soldier" |
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July 18th, 2007, 11:25 | #14 |
your piston problem is quite obvious...
you removed the foam on the face of the piston head.... so your piston was always too far foward when the sector gear catch the first tooth, so it is slipping every cycle.. get a new piston head |
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July 18th, 2007, 12:13 | #15 |
yeah, you should be able to push the piston all the way foward in the cylidner till it stops(including cylidner head), then you should check to see if the sector gear grabs the first tooth.
Yeah if your ripping stuff off teh piston head, things are gonna hit the fan man |
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