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 Valve and piston removal with pictures - Slow leak fix. 
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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
James, has this thread been made into a "sticky" ? Coz if it hasn't, it should be. :thumbup:

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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
Les wrote:
James, has this thread been made into a "sticky" ? Coz if it hasn't, it should be. :thumbup:

Your wish is my command! :salut:

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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
did not take the reg out....actually my gun has a problem....above 180bar it begins to vent air through that hole shown in the picture below...if my drawing is correct then main valve 2.57 x 1.78 O ring could be the culprit ....NOPE... everything OK inside and outside of valve....anyone with an answer or is 300bar cylinder not holding up?

OK problem solved....the valve inlet sub assembly was loose!....that part has to be torqued in with an 8mm deep socket wrench....a better idea would be to install a 6 x 1.5mm O ring as shown in the picture below.....with the reg developing enough pressure to drop the ball in and with only 180bar in the cylinder enough to seal the ball against the 2.57 x 1.78 O ring inside closing the valve, any more pressure was getting relieved off the top of the loose inlet valve subassembly......

Image

thanks for everything friends ....and.... MERRY CHRISTMAS to all you wonderful people...

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Sat Dec 24, 2011 6:28 pm
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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
the part of the rifle that the inlet valve screws into has come loose and is causing a leak. I thinks its called the valve seating does anyone know what tool tightens it.


Tue Dec 27, 2011 2:39 pm
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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
pkjeetesh wrote:
OK step 1....i got the main valve off today.....surprised to see no 7 x 1.5mm 'O' ring on the valve external....

Image

new design......the valve now seals against the 'O' ring shown below....

Image

the main valve disassembly picture....

Image

did not take the reg out....actually my gun has a problem....above 180bar it begins to vent air through that hole shown in the picture below...if my drawing is correct then main valve 2.57 x 1.78 O ring could be the culprit ....NOPE... everything OK inside and outside of valve....anyone with an answer or is 300bar cylinder not holding up?

Image

regards

p k jeetesh


whats the size of the o ring that is inside the breech body, that valve now seats on?

also, I didnt quite understand where should that 6x1.5 o ring be positioned at?
TIA


Sun Jan 01, 2012 11:51 am
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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
i have the same valve arrangment on my rifle (16j .177 full length) so as suggested ,aybe it is a new design i purchased the rifle second hand so not 100% sure of age but looks to be around 2008. im having problems with the reg at the moment (see other post) but the oring that seals the main valve into the block/piston lining measures 14x1.5 it is possible to remove this stainless lining and there is a oring on that which seals it into the block i believe this is 12x1.5


Last edited by m_pragnell on Mon Jan 02, 2012 11:46 am, edited 1 time in total.



Sun Jan 01, 2012 2:08 pm
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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
6 x 1.5mm "O" ring....there...

Image

regards

p k jeetesh


Sun Jan 01, 2012 6:51 pm
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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
I don't have those two dimensions. I turned the existing o ring upside down, hope that helps for now.
I shall see will it leak until tomorrow. I hope not.
When I charge my non quick fill cylinder, its on 200 bar, but when I insert it in the body, it drops down 10 bar, is that normal?
Also, I've managed to mess up my regulator shims (()), so if anyone here has FAC .177 with this design, please PM me the alignment of those.
TIA


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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
Hi after taking mine apart i pushed the firing valve pin right back in the breech do you guys know how to fix this its not the white stem its the part that hits in the breech plz help


Thu Jan 05, 2012 4:49 pm
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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
Hi all,

I I have the leak on my hw100, after reading this post I try to open the front block, and change all O rings that sugested, by curiosity I open the nut that holds the spring discs (16 ea), but I do some thing silly that I drop all the spring disc and did not know the original configuration of the spring disc.

other question, is it lapped the cone shape of the firing valve with really soft grit (10000) abrasive paste (abrasive for fixing industrial high pressure valve), because I think, mine leaks from that parts, not the O rings ?

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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
The washers stack in pairs.... (())(())(())(())

Picture from POK! HW100 tweaks post.
Image

As suggested by him, trap some #0000 wire wool in a drill chuck and turn the wool in the cone, be very careful to not alter the tapered angle.. (And clean with a blast of air from your dive cylinder or compressor).

I used some P1500 on seating edge of the firing pin to remove all the scratch marks again taking care to not alter the angle.

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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
very helpful pictures and drawing on valve/piston removal i note on the latest drawing for the newer hw100s it shows an extra o ring can changing all o rings still be carried out via front end with out touching the regulator and can somebody let me know all the seal sizes required any info would be a big help cheers regards razon


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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
Hi all,

After changing all o rings, except the PTFE ring on fiirng pin, and its still leak, I decided to lapped the face of cone shape firing pin to its mate on the breech with 2000 grit paste, and it fix the leak problem. tomorow I will try to crono it and set to 1000 fps.

I will see how many shot I can get and how many on the plateau from 200 bar .

If I dont like the rsult I guess I have to change the spring disc set up.

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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
Good to hear the leak has been solved. Best of luck to setting it up, if the Belleville washers are indeed stacked differently for the FAC version, then you may find that it will be shooting at a higher fps then you want.

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Unread post Re: Valve and piston removal with pictures - Slow leak fix.
pamanbijak wrote:
Hi all,

After changing all o rings, except the PTFE ring on fiirng pin, and its still leak, I decided to lapped the face of cone shape firing pin to its mate on the breech with 2000 grit paste, and it fix the leak problem. tomorow I will try to crono it and set to 1000 fps.


I will see how many shot I can get and how many on the plateau from 200 bar .

If I dont like the rsult I guess I have to change the spring disc set up.

Part of post edited by Admin. Reference to bellville washer instalation in FAC model.

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