Military Action Titanium Piston Jamming

PoFF · May 23rd, 2009, 10:10

I've recieved my new parts from Airsoftparts.ca (excellent service BTW), and one of these parts was a Military Action aluminium piston with full titanium teeths. I rebuilt my gearbox (PGC V3 gearbox for TOP M249) and what's happening is that the motor & gears are fully cranking the piston, and the gears continue to spin, but the piston stays back, fully cranked (with the gears making an awful grinding sound.

I know that the gear timing / shimming / overall installation is perfect, as the whole setup works perfectly with another piston that I had on hand.

Any reason why such a thing would happen, do I need to go some filing and/or grinding on that piston for it to work properly?

MODS : Please feel free to move this topic into the Doctor's Corner if needed, as I wasn't sure of the right location.

m102404 · May 23rd, 2009, 13:34

There's a thread right now on the go about somebody's v2 locking up...take a read through that...it'll hit all the same things that are going to be suggested here.

PoFF · May 23rd, 2009, 16:22

I've read that post, but my symptoms are different : My piston fully compresses the spring and clears the sector gear (barely, hence the light grinding sound). It's just not coming back like if something was preventing it (dimensions, metal burr, no idea..) from "firing".

zone 69 · May 23rd, 2009, 16:56

Some brand springs jam up on the spring Guides. The walls of the new piston is thicker so less room for the spring to expand. this is my best gess.

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May 23rd, 2009, 10:10	#1
PoFF Trader rating Join Date: Dec 2001 Location: Laval, QC	Military Action Titanium Piston Jamming I've recieved my new parts from Airsoftparts.ca (excellent service BTW), and one of these parts was a Military Action aluminium piston with full titanium teeths. I rebuilt my gearbox (PGC V3 gearbox for TOP M249) and what's happening is that the motor & gears are fully cranking the piston, and the gears continue to spin, but the piston stays back, fully cranked (with the gears making an awful grinding sound. I know that the gear timing / shimming / overall installation is perfect, as the whole setup works perfectly with another piston that I had on hand. Any reason why such a thing would happen, do I need to go some filing and/or grinding on that piston for it to work properly? MODS : Please feel free to move this topic into the Doctor's Corner if needed, as I wasn't sure of the right location. __________________ Founding member of the S.A.T.T - That's right, were BACK! The only purpose for a pistol is to fight your way back to the rifle you should have never laid down Visitez Arme ?* Feu.com - Le site des amateurs d'armes ?* feu francophones Last edited by PoFF; May 23rd, 2009 at 12:51..

May 23rd, 2009, 16:22	#3
PoFF Trader rating Join Date: Dec 2001 Location: Laval, QC	I've read that post, but my symptoms are different : My piston fully compresses the spring and clears the sector gear (barely, hence the light grinding sound). It's just not coming back like if something was preventing it (dimensions, metal burr, no idea..) from "firing". __________________ Founding member of the S.A.T.T - That's right, were BACK! The only purpose for a pistol is to fight your way back to the rifle you should have never laid down Visitez Arme ?* Feu.com - Le site des amateurs d'armes ?* feu francophones

May 23rd, 2009, 16:56	#4
zone 69 Trader rating Join Date: Sep 2006 Location: KELOWNA , B.C CANADA, PLANET EARTH	Some brand springs jam up on the spring Guides. The walls of the new piston is thicker so less room for the spring to expand. this is my best gess. Last edited by zone 69; May 23rd, 2009 at 17:11..

May 23rd, 2009, 13:34	#2
m102404 Tys Trader rating Join Date: Apr 2006 Location: Toronto	There's a thread right now on the go about somebody's v2 locking up...take a read through that...it'll hit all the same things that are going to be suggested here.

Military Action Titanium Piston Jamming

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