What type of o ring to use to seal gauages on guns?

[ImpactX]

Hello. I have an fx impact. It was leaking so I used leak detector to find the leak. It was coming from the front gauge. I replaces with an normal black o rings. It stopped the leak but after 3 days it started to leak from the same gauge. So I checked and the o ring I just replaced was already crushed and damaged. I guess normal o rings will not work. I know Yong heng compressor don't use o rings to seal, they use white hard plastic type disc to make the seal. So for my impact gauge. Do I use o rings or white plastic disc to make the seal? It seem the rubber black o rings get crushed too easily by the pressure.

 

[Dog]

Not having the manual, I would guess the white flat seals like the YH....

 

[jphef]

I use the 105 70 Oring for the gauges which works well for me. Looks like maybe you tightened it a bit much?

 

[KatoKevin454]

the white seal is either nylon or delrin

Amazon.com : nylon 10mm seal for PCP gauge

 

[Stubbers]

the white seal is either nylon or delrin

Amazon.com : nylon 10mm seal for PCP gauge

PTFE is quite common as its a bit softer.

I second these and the 105 70 duro o-ring, I use both in different applications at high pressures.

-Matt

 

[cosmic]

X ring..

 

[Stubbers]

X ring..

They make square 'o-rings' too.

-Matt

 

[ImpactX]

I use the 105 70 Oring for the gauges which works well for me. Looks like maybe you tightened it a bit much?

I only hand tight. Using wiki guages not fx gauge. I believe its 70 duro. Maybe 90 duro is better for hpa.

 

[jphef]

I do lube the O-ring with silicone oil before putting it in and a little on the bottom of the gauge. Have done this with many Impact gauges with no failures, usually hand tight or just a touch more.

 

[Gerry52]

As said before, white delrin/nylon discs. They seal the best with gauges, cheap too. Check Aliexpress, Ebay, etc.

 

[jarmstrong]

they sell nylon washers in the local hardware store,,, if you want nylon

 

[Ta-Ta Toothie]

There is either a burr on the gauge, or your cranking down to tight on those.

 

[KitCarson16]

Experience and age teaches us slowly. I always without fail liberally coat all o rings with silicone oil. Hand tight plus just a smig'eon is how I tighten them.
Look for rough spots, little curls of metal, raised burrs etc, etc.

Generally always something simple, once you find it you will stare at it and wonder just how stupid can I be........Chuckle. Anything stupid I have done it.

Cheers
Kit

 

[SilentSquirrel]

Hello. I have an fx impact. It was leaking so I used leak detector to find the leak. It was coming from the front gauge. I replaces with an normal black o rings. It stopped the leak but after 3 days it started to leak from the same gauge. So I checked and the o ring I just replaced was already crushed and damaged. I guess normal o rings will not work. I know Yong heng compressor don't use o rings to seal, they use white hard plastic type disc to make the seal. So for my impact gauge. Do I use o rings or white plastic disc to make the seal? It seem the rubber black o rings get crushed too easily by the pressure.

View attachment 487022

May I suggest that you go to the FX website.
There you can find the parts diagram and parts list for your particular Impact.
That will tell you the exact size of what type of seal to use (o-ring, delrin seal. douty washer, etc) for your gun
Here is a link to the FX Support page

SUPPORT - FX Airguns

fxairguns.com

Hope this helps
Edward

 

[rodm1]

Not shire if current but this thread is very good. Download the excel file.

https://www.airgunnation.com/attachments/impact-parts-list-and-oring-list-1632176704-xls.175000/