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Forums › Marker Talk › Problem/Tech forum › b2k4 venting, have tried the suggested solutions

b2k4 venting, have tried the suggested solutions
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mudj86
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PostPosted: Thu Apr 11, 2013 10:05 pm    Post subject: b2k4 venting, have tried the suggested solutions

I have a b2k4 that has a venting solenoid. I have tried most of the solutions I have found on this site but still no luck. I have replaced all the o rings, I have checked all the gaskets, I have lubricated everything.
I took the solenoid apart and pulled the pilot, even after lubing it still feels stiffer than what I would think. How freely should this move?
When I air the marker up, i have my hpr and lpr turned right down, I turn my hpr until it hits 100, than turn my lpr up and it starts venting. It also vents at higher (225) psi.
And yes, I have changed the battery haha.
Any thoughts?
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ogti9g9
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PostPosted: Thu Apr 11, 2013 10:47 pm    Post subject: Re: b2k4 venting, have tried the suggested solutions

Could be a bad solonoid period, is it a Parker or a Humphrey?

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PostPosted: Fri Apr 12, 2013 1:57 am    Post subject: Re: b2k4 venting, have tried the suggested solutions

hold up. i hope that you meant the HPR to 225psi and LPR to 100psi? just for clarification, LPR is under the barrel, HPR is vertical in front of the trigger frame.

when lubing the pilot, you should only have a light sheen to it. you only need a minimal amount of lube for it. it doesn't have to move as freely as you think. it moves by shifting the magnetics.

proper setup should be:
1) zero out both the HPR and LPR
2) turn HPR up to about 200psi
3) turn LPR up till bolt moves back
4) shoot gun(bolt will be sluggish), then turn up LPR about a 1/4 turn more
5) chrono gun, adjust HPR up to field limits.

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mudj86
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PostPosted: Fri Apr 12, 2013 8:10 am    Post subject: Re: b2k4 venting, have tried the suggested solutions

It is a Humphrey solenoid.
Sorry for the misunderstanding, yes Nobody, the HPR is set at 225. I have no way of gauging the output of the LPR. The pilot has a light sheen to it, I even took it apart, cleaned it, and tried again with no luck.
When I said I set my HPR at 100, its because I was told the solenoid vents at 125psi, so I was seeing if the LPR was the problem (no? solenoid shouldnt be seeing 125 psi if marker only recieving 100)
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PostPosted: Fri Apr 12, 2013 11:33 am    Post subject: Re: b2k4 venting, have tried the suggested solutions

the solenoid vents when the LPR is above 125 PSI.

operating pressure refers to the HPR. the LPR only functions as the pressure regulator for the air that runs through the solenoid.

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forstgump
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PostPosted: Fri Apr 12, 2013 2:37 pm    Post subject: Re: b2k4 venting, have tried the suggested solutions

Back out the lpr. Gas up, then increase the lpr.

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PostPosted: Fri Apr 12, 2013 2:39 pm    Post subject: Re: b2k4 venting, have tried the suggested solutions

I see where you are going with that, the only issue is sometimes the solenoid will vent with too little pressure as well. So, the thing that I would do is zero the LPR, set your HPR to around 225 and then work the lpr up. if it starts venting, don't worry. Keep turning the lpr up until the bolt cocks, then go another 1/2 to 3/4 turn. That should put you close to the upper end of the operating pressure of the noid. If it is still leaking, use the red button on the noid to cycle it 5-10 times. That should get the orings solidly seated. If it is still venting after the bolt cocks and you go that additional 1/2 turn, I would check all my ram orings to verify that the center housing ring and the piston ring are good.

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mudj86
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PostPosted: Fri Apr 12, 2013 5:58 pm    Post subject: Re: b2k4 venting, have tried the suggested solutions

I have zeroed the HPR and LPR, set the HPR, than worked the LPR up many times, it still leaks.
The bolt cocks properly and the marker functions perfectly, but the solenoid continuously leaks from the left side (side with on/off switch) machined portion of the manifold.
I have changed all of the o'rings in the marker, with the exception of the rings on the pilot in the solenoid. Can anyone give me the size of those o'rings so I can try changing them?
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eeyore
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PostPosted: Sat Apr 13, 2013 12:29 am    Post subject: Re: b2k4 venting, have tried the suggested solutions

Have you tried flipping the seal in the LPR?

A poor or malfunctioning seal can cause the symptoms you describe.
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