Tuning Leshiy 2 REPR regulator leak

Finally got me a Leshiy 2 REPR. Came shooting as expected right at 900 fps (which is ideal for most people), but I wanted to dial it back a bit for some steel plinking drills.

I used the OEM REPR adjustment tool to reduce the velocity of the 18g pellets to 830 fps (27 FPE). I ran it through the chonograph while detuning it and for about 3 magazines afterwards 

A few days later I found some time to mount the scope & dot, and clean the barrel. 

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Then I went to top off the air reservoir and "pffffft" all of the air slowly drained out of the regulator.

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Problem? Solution? Thanks!

Kinda wanted to try out my new steel targets today.

-Michael
 
I am by no means a mechanically inclined repair expert nor do I own this gun.

Before doing anything such as calling Ed Gun West it may be beneficial to watch this simple repair disassembly video first just to see how it ticks but do not attempt any disassembly yet. 

I would first attempt to fill it as usual again from a tank.

If it leaks out after 2 to 3 fill attempts I would adjust the regular to undo what was done to lower it then try filling it up again assuming it will be set at the original higher power. 

I always thought regulators need to be broken in before making any adjustments but I am not an expert.

If it holds air then it may be the adjustment was too low and it did an air dump when you tried to refill the gun perhaps being still too new.

If it leaks then I would contact the vendor and mention how you proceeded in lowering the adjustment and what happened and mention that you already watched the video and it looks like it could possibly be one or two orings that doesn't appear to be anything major.

The video makes things look simple enough even for someone like me to understand.

If it holds air I would probably shoot it for another refill of air then next fill try to do the lowering adjustment again slowly eight of a turn increments.

When PcPs do the air dump it is usually because the gun thinks the pressure is too low.

Lucky the gun wasn't loaded pointed in a safe direction otherwise I would worry about it possibly going full auto when that air dump happens.

Hope it helps.

https://youtu.be/qn_AU3-Evj0




 
I would do as mentioned above by Batman first. The reg is sealed by o rings and shouldn’t leak unless there is a bad one. I had a slow leak at the rear of the regulator that turned out to be a missing grub screw. Then I couldn’t get my Wika gauge to seal on the opposite side of the valve adjustment. I smashed the delrin washer right off the bat , listen to Brian just a SNUG fit is required. Then the o ring that came with the Wika gauge I think wasn’t the correct OD and would slip to the side and leaked. Put a larger o ring in and now not leaking. Let us know what you find out to be the problem or fix.
 
Well that was easy to fix. I degassed the air cylinders, removed the piston housing, pulled out the piston and washers, replaced the 1.5mm x 5mm o-ring, put it back together and filled it up! 

I spoke to Brian and it sounds like there were 2 things I could've done differently. 

1. When decreasing regulator pressure (I went from 900 fps with 18g down to 800 fps with 18g) it is recommended to adjust the regulator in small increments and simulate a few test shots via bursts of air with the bleed screw.

2. When the pressure in the air tube drops below the regulator pressure it is recommended to fill very slowly and dry fire a few times while filling (make sure to use the magazine without any pellets). This gives the delrin seal a chance to re-engage with the ceramic ball. If the delrin seal doesn't engage the ceramic ball then all the pressure is held back by the tiny o-ring (which will fail about 200 bar). I chose to dry fire every 25-50 bar while filling from empty

Thanks for your help, I'm all set. Now it's time to ring some steel!

-Michael
 
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