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First NPAS problem?

npas N.P.A.S problem fixes nozzle loading lm4

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#1 apilar

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Posted 16 January 2013 - 05:29 PM

Alright guys! Ive been looking through information on the NPAS.
Ive had it for awhile and everything was running smooth just like everyones post has said.

However, one day i noticed that it had jammed up.

It wasn't the nozzle jamming or sticking.
What got stuck was the actually system inside the nozzle. The 3 prongs - front and back - that interlock had become un-interlocked and stuck out through the opening where the gas enters.

Here are some photos. This is the npas and nozzle**

https://www.dropbox....mm/DSCF3035.JPG
https://www.dropbox....co/DSCF3034.JPG
https://www.dropbox....m8/DSCF3033.JPG
https://www.dropbox....wl/DSCF3031.JPG
https://www.dropbox....cq/DSCF3028.JPG
https://www.dropbox....xv/DSCF3027.JPG
https://www.dropbox....46/DSCF3025.JPG
https://www.dropbox....vl/DSCF3021.JPG
https://www.dropbox....on/DSCF3019.JPG
https://www.dropbox....4n/DSCF3017.JPG
https://www.dropbox....ye/DSCF3016.JPG


Tons of photos!
Hopefully, you can see what has happened!
Its easily pushed back in with a screw driver... but i dont think the npas works properly when its jammed up like that??

Has this happened to anyone else??

Thanks,
Alex

#2 Raptor72

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Posted 17 January 2013 - 06:35 AM

Has not happened to me.  At what FPS do you have it set at?  I would think this could only happen when it is very slack.  I have taken my RAT nozzle apart to see it the innards were transferable to the original nozzle housing.  Its not that hard as all you have to do is remove pin at the oring end of the nozzle and it all comes out.

I took an eye glass screw driver kit and cut off all of the driver ends.  I then flattened the ends and now use them as airsoft pin punches.  The was like this one:

http://www.aliexpres.../581955874.html

Edited by Raptor72, 17 January 2013 - 06:36 AM.


#3 MultipleParadox

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Posted 17 January 2013 - 11:12 AM

Looks like you just unscrewed the NPAS too much and bot parts are separated

Just open the nozzle, take out the NPAS and put it back together, should be good to go

#4 apilar

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Posted 17 January 2013 - 05:27 PM

Yeah it was set up at about 460ish with .25s, and when it happened it was about -5 degrees celsius outside! sooo that could have been a factor in it

And yes ive had it apart and re-built initially, but discovered that it can just be pushed back in with a screw driver

#5 MultipleParadox

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Posted 22 January 2013 - 06:18 AM

What do you mean by being pushed back?

The NPAS is basically a replacement of the so called Jet valve inside the plastic nozzle.

Both the Jet valve and NPAS are "mounted" on a spring inside the nozzle; That would explain you being able to push it back with a screwdriver

The NPAS, as opposed to the jet valve, is two pieces screwed together; when you adjust velocity, you screw/unscrew this; going too far unscrewing it would cause both pieces to come apart

If that's what happen you need to remoe the nozzle from the BCG and then open the nozzle to remove the npas

#6 Raptor72

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Posted 22 January 2013 - 06:51 AM

Paradox,

This NPAS is a completely different design.  I have the RAT WE NPAS in my SCAR and the KSC NPAS/nozzle in my LM4.  I can tell you the KSC NPAS is NOT the typical design and has more parts.

See the vid below to see the NPAS broken down:

http://www.youtube.c...&v=Ki6QkbswNho#!

#7 MultipleParadox

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Posted 22 January 2013 - 08:49 AM

My bad! Haven't received mine just yet but I assumed  it was the same kind of design
Sorry for the preemptive response that went wrong :P

I just took a quick look at the vid, it seems much more complex indeed! O_o

To OP: Regardless, my take on this is that I think your sole option if to dismantle the thing and see what's really wrong with it. That's what *I* would do but I guess it might not be for everyone. One thing is sure I wouldn't use it in that condition as if too much or too less gas pass in there, this might lead to more problems elsewhere.

#8 Raptor72

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Posted 22 January 2013 - 08:51 AM

No worries.  I will add that I have also had my NPAS malfunction in the same way as the OP.

#9 apilar

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Posted 23 January 2013 - 10:41 AM

Yes by 'pushing it back in' I mean that the piece that gets popped out and wedged is spring loaded. sooo just push on the part that popped out.. re-compress the spring and it just goes back in.





Also tagged with one or more of these keywords: npas, N.P.A.S, problem, fixes, nozzle, loading, lm4

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