QB 78 converted to HPA now leaking. HELP!

[klentz4]

Bought a QB 78 that was already converted to HPA about 6 years ago.  It has a JDS airman 3000 psi tank that's 33 ci, has a regulator and has developed a slow leak.  I'm not handy and I'm too busy to take on another project. 

Is there anyone that you would recommend to reseal this gun and check/clean the regulator?

[klentz4]

Anyone?

[Bentong]

Try here >

Parts here > http://www.ansgear.com/Ninja_Tank_Regulator_Rebuild_Kit_p/ninjatank-rebuildit.htm

[nervoustrigger]

In looking for someone to do the work, I suggest checking the Tuners gate for some names and reach out to them:
https://www.gatewaytoairguns.org/GTA/index.php?board=207.0

Unfortunately in most cases it's too expensive to ship a rifle and the labor too costly for it to make sense.  That kicks in really hard for the budget rifles, not so much for a RAW TM1000.  I suspect that's why many of us do our own work.

If you decide to have a go at it, my advice is to try first spritzing soapy water (e.g. Dawn) on the bottle's neck, bonnet area (gauge, fill port, burst disks), and where the tank block joins up to the tube.  Hopefully you'll see some bubbles.  If you don't, it means one of two things:

1.  The leak is too slow to identify.
2.  The leak is in the gun, which means one of two places.  Either the -113 O-ring around the valve body or at the poppet.

For what it's worth, just about a week ago I set about to track down a slow leak in my 2240 HPA conversion.  It's built very much like the typical QB79/QB78 HPA tanker, including the QB tank block and Ninja bottle.  Soapy water showed me nothing and I just knew the leak was in the tube, and I was not excited about taking it apart because I had to do something unconventional when assembing it that was going to make it a pain.  So as a latch ditch chance, I took off the tank and submerged the head into a clear drinking glass.  Aha!  Very slow bubble formation at the 1.8k burst disk.  I had previously tried cranking down on it because I've seen that before but apparently I hadn't gone quite far enough.  A little more torque and the bubbles stopped.

So whichever path you choose, good luck!

[klentz4]

Gentlemen,

Greatly appreciate your replies and suggestions.  This is a gun I gave to a friend for pest control.  May sound crazy to you but he loves the gun and can afford to have me ship the gun and have someone fix it right rather than have me take forever to make a mess of things.  Thank you again

[Gertrude]

Give Tim a call at Mac1 Air guns.
He is in Signal Hill, Calif.

[Tucobenedicto]

I had various issues with JDS regulators in the past,the seals was not top quality.You have some choices: buy a rebuild piston from Mr Distefano (complete with o rings) or rebuild using a Ninja rebuild kit,Ninja pistons fits perfectly,but in this case the output pressure MUST be checked and readjusted if needed.
I suggest to replace the o ring at the regulator-bottle coupling too,i found one in bad conditions after a couple of years of use.
Ninja pistons tends to creep much less too.

[Tucobenedicto]

One thing more about JDS regs,i found a fill nipple leak too in a brand new one.check with soapy water as stated above.

[klentz4]

Ron,

What a great suggestion!  I've been out of the game for so long that I didn't even think of Tim McMurray.  I'll call him.  Thanks

Tucobenedicto, 

Thanks for your help.  Couldn't find any leaks spraying with soapy water but did replace the foster fitting since I have a paintball place only 2 miles away.  Slow leak persisted and now I need to get an expert involved.  Don't have time for anymore nonsense.  Maybe Mac1 or someone else you can suggest could help?