Tuning Leshiy airleak troubleshooting

[Pizzaman2976]

Hey guys,

I got my first Leshiy in .25 and love it. It's the classic model and I installed a 12 ft pound Huma reg to keep this quieter for backyard pests..

It has the electronic EDMU gauge and I noticed the bar pressure dropped slowly overnight from around 220 to 180s and now around 148.... 

I made sure to close the de-gas screw.... any ideas where the leake could be coming from and how to stop it? 

Thnaks

 

[JWilson]

Use soapy water to see where it is coming from. Check the bleed screw, where the tube meets the valve and the transfer port for starters.

 

[Pizzaman2976]

Thanks, JWilson. I think I'm gonna have to do that. I tried closing the de-gas bleed screw as tightly as I could and would be surprised if it was leaking there (although it totally could be). I also wonder if it's where the fill port goes in. I'll do some testing....

Is there a way to "reseal" or fix any of these leaks other than tightening everything even tighter? 

 

[JWilson]

Usually nothing has to be really tight at all. Did you remove the gauge or fill port plug? I thought all you did was a reg...

 

[Pizzaman2976]

Usually nothing has to be really tight at all. Did you remove the gauge or fill port plug? I thought all you did was a reg...

Thanks I'll do some checking. Nope I didnt remove any gauge or fill port, just the reg. Just tryin to figure which end of this tube is leaking hah 

 

[Acruz]

I thought I had a leak on my Leshiy and it turn out to be I was filling up too fast. I seems they are very sensitive to filling up too fast and the pressure will decrease till it gets to the level that's in the tube.

 

[AceRph]

My Leshiy leaked down after I installed a Huma reg. Turned out that the o-ring next to the plenum squeezed btwn the air cylinder wall and the reg body. After a couple of stock o-rng replacements didn't work, I installed a 90 duro one. Hasn't leaked since.

 

[Scouty]

Do not over tighten the bleed screw. 

I've had a few leaks in my Leshiy. One was from the regulator. I can't remember which O-ring but I went ahead & replaced all of the easy to get to one's.

Pretty sure that leak was from the standard Huma, not the sub-12. My vague memory is that the O-ring setup is different between the two. I'll look at some pictures & and see if I can remember. 

 

[Scouty]

Looked at some pictures on the Huma site. It's not that the O-ring setup is different but rather the sub-12 regulator has two grooves instead of one. But only one groove takes an O-ring.

Standard Huma reg only has one groove.

 

[Parrotculler]

I would check the bleed valve first and, for low-pressure guns, the barrel second.

Hold the muzzle into a small tray of soapy water with the breech sealed. If bubbles come out of the muzzle ya're looking at a valve leak. Sometimes happens in guns where the air pressure on the valve is so light that the poppet does not seal anymore. Tricky situation with solutions (e.g. increasing the valve spring preload), but I am not familiar enough with the Leshiy to help. If this were to be your diagnosis you may wanna get in touch with Motorhead (aka "The Master"). 

 

[Pizzaman2976]

Thanks guys. Still no luck finding the leak yet. 

I also didnt think about the reg pressure affecting the leak. I have it set at around 80 now, but will try cranking it up to around 105. I've read all I could find about low power leshiy tunes and was surprised at the range people seem to be using with good results....

 

[Pizzaman2976]

I also have the standard Edgun reg still and was thinking about tinkering with that for a low power tune, but always assumed the 12 ft Huma reg would be better for that...

 

[jungle]

Found the leak yet?

I do not have a leshiy but I use leak detector from home depot or I dunk any suspicious leaky part in water.

I know the whole dunk sounds weird or uncomportable but throughly dried up the part(s) will not be harmed and the dunk will show where the leak is. I have done it many times and not rust part yet found.

Hope you found the fix already.

 

[Pizzaman2976]

Found the leak yet?

I do not have a leshiy but I use leak detector from home depot or I dunk any suspicious leaky part in water.

I know the whole dunk sounds weird or uncomportable but throughly dried up the part(s) will not be harmed and the dunk will show where the leak is. I have done it many times and not rust part yet found.

Hope you found the fix already.

Thanks! Not yet and I'll try the dunk I thing if I cant find it soon. I put some gun tape on the tube and was trying to keep it dry but dont think it will work lol. Hope you're well. 

 

[Odoyle]

I would just try shooting the hell out of it as-is for a while first and see if the leak goes away.

 

[bdmoody]

View attachment MTUzOTIwNzA0OF82Mjg4OTY1Nzk1YmJlNmY4ODQ1ZTA2Ny41MjgxNjExOF/QodC/0LjRgdC+0Log0L/RgNGD0LbQuNC9INC4INGA0LXQt9C40L3QvtC6LCDQsdC+0LvRgtC+0LIg0K3QlNCz0LDQvS54bHN4



Download the file, there are 2 tabs 1 in Russian and 1 in English

When you installed the reg, you used silicone grease, right? Just a little

remove the air gauge, called manometer, and ensure that there is a o ring in the “well”. You will see what I am talking abut once you unscrew it, just loosen the carabiner and slide forward and then you can get wrench on the gauge. The o ring should have a small, just a light coating of grease also.

Now, when replacing the EDMU, the dang gum things won’t line up. You need to pop the cover, and reposition the electronics for the orientation. See Brian vid on You tube. The one on that gun doesn’t have the hole to blow air, it looks like it may use a small pry tool, but google it. That gauge is from a later serial number gun than the one you have. (Mine, I never used this gauge) I tested it and it didn’t leak.

I think the o ring is a 105 or 108, it must be a metric designation of some sort. Go to the Huma site, look at the rebuild kit, and get the right one or use the link above, but the above link has a different sizing, so I am not sure what is means without googling it.

 

[Pizzaman2976]

View attachment MTUzOTIwNzA0OF82Mjg4OTY1Nzk1YmJlNmY4ODQ1ZTA2Ny41MjgxNjExOF/QodC/0LjRgdC+0Log0L/RgNGD0LbQuNC9INC4INGA0LXQt9C40L3QvtC6LCDQsdC+0LvRgtC+0LIg0K3QlNCz0LDQvS54bHN4



Download the file, there are 2 tabs 1 in Russian and 1 in English

When you installed the reg, you used silicone grease, right? Just a little

remove the air gauge, called manometer, and ensure that there is a o ring in the “well”. You will see what I am talking abut once you unscrew it, just loosen the carabiner and slide forward and then you can get wrench on the gauge. The o ring should have a small, just a light coating of grease also.

Now, when replacing the EDMU, the dang gum things won’t line up. You need to pop the cover, and reposition the electronics for the orientation. See Brian vid on You tube. The one on that gun doesn’t have the hole to blow air, it looks like it may use a small pry tool, but google it. That gauge is from a later serial number gun than the one you have. (Mine, I never used this gauge) I tested it and it didn’t leak.

I think the o ring is a 105 or 108, it must be a metric designation of some sort. Go to the Huma site, look at the rebuild kit, and get the right one or use the link above, but the above link has a different sizing, so I am not sure what is means without googling it.

Thank you!!! I'm going to try all this again..I didnt do the silicone grease and check the o rings.

It also stopped leaking around 108 bar...

 

[JWilson]

Did you check with soapy water yet? You will likely see bubbles where the air tube meets the valve. Check and lube the ring on the OD of the reg and the forward face of the reg.

Could be leaking at the gauge or fill port, but don’t mess there unless you see bubbles in soapy water. This started when you swapped a reg right?

 

[KatoKevin454]

pull it apart again and check all the o-rings, if all seem fine lube them with silicone grease or silicone oil, it is obvious that it's leaking from something you removed to do the regulator, so if you check the o-rings for burrs cuts or even scratches on the o-ring and the sealing surface replace as needed, get yourself an O-ring kit, just as backup when needed, 

Note: Do NOT use metal tools to remove O-rings, metal tools can scratch sealing surfaces, use plastic tool, toothpick or your finger nail.

 

[lbc_PSI]

I'm thinking that dunking the EDMU would be a bad idea. Not sure how waterproof the EDMU internals are..but as a general rule circuit boards tend to not like water.

If you adjusted the EDMU so it looks "straight", it could be you loosened or over-tightened the o-ring were the gauge is screwed into the air tube.

Check for a leak where the air tube screws to the folding stock. If there are o-rings that are leaking internally, you'll see bubbles when you wipe that area with soapy water. That will narrow down your search.