Theoben Rapid Forum

KevG Lathe work undertaken => kevG section => Topic started by: nevadacowboy on July 27, 2021, 10:02:09 PM

Title: Exhaust valve body seals
Post by: nevadacowboy on July 27, 2021, 10:02:09 PM
I had a problem today with air leaking out the barrel so I changed al the seals.  The size I have for the tail seal on the valve body is 4.1 x 1.6mm.  Is this the correct size as it was very difficult to fit.  Is there a tool similar to the mfr push pin seal tool that would make this job easier?


PS: I cured the leak.
Title: Re: Exhaust valve body seals
Post by: KevG on July 27, 2021, 10:38:12 PM
yes they are a little tough to fit.but only need to be ni70.if they are ni90 they would be very hard to get on.i don't bother with a tool as its easy enough with out m8.
KevG
Title: Re: Exhaust valve body seals
Post by: nevadacowboy on July 27, 2021, 11:01:35 PM
There must be a knack to it Kev as I found it very difficult. Make me a tool please, I like an easy life.
Title: Re: Exhaust valve body seals
Post by: angrybear on July 29, 2021, 04:58:47 PM
I find the plastic toothpicks from Sainsburys very handy for digging out seals  ;)
Title: Re: Exhaust valve body seals
Post by: Ca_Varminter on July 29, 2021, 05:40:23 PM
Like they say.......
A little Lube helps in a tight squeeze!!
I always apply a little Molykote on my O-ring whin I fit Them!!
Make them more pliable...
Then just start on ones side, roll it over the edge with your Thumb!

Good Luck,
Stuart
Title: Re: Exhaust valve body seals
Post by: mnementh on July 30, 2021, 11:45:01 AM
You could also try heating the O ring up a LITTLE bit.

50 - 60 degrees will make it much more flexible.

Apply Molykote affter.

Be aware excessive heat for a sustained period WILL harden it, not soften.

Sandy
Title: Re: Exhaust valve body seals
Post by: KevG on July 30, 2021, 09:10:41 PM
could make a tube but to be honest will be nearly as hard getting it on the tool as the valve tail.70 shaw should go on ok.
kevG
Title: Re: Exhaust valve body seals
Post by: KCE on July 30, 2021, 10:33:26 PM
Would this little tool work.

Regards kev.
Title: Re: Exhaust valve body seals
Post by: Ca_Varminter on July 31, 2021, 09:27:10 PM
OK Rapid Minions...

Are you are have trouble installing that Valve-body tail O-ring???

Here is a little tool I just turn on my Lathe...
Valve-Body Tail O-ring installation Tool....
I made it out black Delrin.
Front end is turned down to the same size as a Valve-stem's Stem.
The Back end is the same diameter as the Tail of the Valve-body, but with a a gentle 5° taper on the end

So just slide the small end into the tail of the Valve-body.
Then grease up a tail O-ring and slip over the tapered end of the tool.
Then just roll her home!!
EZ
I only use D90A (hard) O-rings in my rapids!

(https://photos.imageevent.com/scl_electronics/gun/misc/websize/Oring%20tool1.jpg)

(https://photos.imageevent.com/scl_electronics/gun/misc/websize/Oring%20tool2.jpg)

(https://photos.imageevent.com/scl_electronics/gun/misc/websize/Oring%20tool3.jpg)

(https://photos.imageevent.com/scl_electronics/gun/misc/websize/Oring%20tool4.jpg)

If you think this can help you.... Give KevG a Call.... I am sure he could turn few of these on his Lathe!!

Stuart
(https://media.giphy.com/media/oobNzX5ICcRZC/giphy.gif)
Title: Re: Exhaust valve body seals
Post by: nevadacowboy on July 31, 2021, 10:28:11 PM
Over to you @KevG. Happy to pay cost and postage.
Title: Re: Exhaust valve body seals
Post by: KevG on August 01, 2021, 12:04:39 PM
knocked you one up m8.send me your address and will pop it in post tomorrow
KevG
Title: Re: Exhaust valve body seals
Post by: nevadacowboy on August 01, 2021, 01:53:35 PM
Thanks Kev.


You have PM.


Bob