Author Topic: More DAR bad luck (Read 20515 times))

Gertrude · « **Reply #180 on:** August 14, 2018, 03:12:03 AM »

I completely agree that there are some QC and fundamental design issues that need to be addressed for these guns to show their full potential.
Others have shared several of their findings, and I have started to list some of my findings and concerns here,

https://www.gatewaytoairguns.org/GTA/index.php?topic=146178.0

As my trigger and tinker time allows, I intend to continue defining the discrepancies (and/or potential discrepancies) for the purpose of improving the performance and function of these rifles. Hopefully it will be to the benefit of all who have purchased, or are considering purchasing one of these rifles.

BigMike1 · « **Reply #181 on:** August 16, 2018, 09:42:20 AM »

Any one else get the return email notice from aim sports ? I just received an email that they want my DAR22 back and sent a return shipping tag! I hope they can get it to work like it should . I really like this gun and talk about shoot well and It is just a fun gun!

kingrude1 · « **Reply #182 on:** August 16, 2018, 09:45:49 AM »

Yes I got that email too. After trying everything I could think of the gun just wouldn't seal. So it will be heading to Aim Sports via UPS today.

Rat Sniper (AKA: PaulT58) · « **Reply #183 on:** August 16, 2018, 09:50:17 AM »

I didn't get an e-mail with an RMA, but the parts I need should arrive today. Hopefully they will fix my leak and I won't have to send it back. I hope you both get trouble free rifles after all you've been through!

Wayne52 · « **Reply #184 on:** August 16, 2018, 02:30:26 PM »

I was fortunate to have two of them that sealed great with the 90duro o rings and neither one of them has dumped since.

Rat Sniper (AKA: PaulT58) · « **Reply #185 on:** August 16, 2018, 02:52:25 PM »

It's a beautiful thing! These arrived today and are about to be installed!

kingrude1 · « **Reply #186 on:** August 16, 2018, 03:41:41 PM »

Congratulations I hope this stops your leak and you can get on to the business of shooting your gun!!

Rat Sniper (AKA: PaulT58) · « **Reply #187 on:** August 16, 2018, 05:36:33 PM »

Thanks David! I ran 3 magazines through it and have aired it back up and will let it sit for a day and see what happens. Big difference in these springs! Below is a picture of the new poppet and spring next to the old poppet and spring.

The last remaining issue I have is the crack in the magazine cover, but since the spare magazines are still on the slow boat from China, I may have to deal with it and hope it stays together.

BigMike1 · « **Reply #188 on:** August 16, 2018, 06:37:15 PM »

Looking at my poppet you would think they would have made a taper seat and tapered the valve.. Would be a great upgrade in the future..

tracker1955 · « **Reply #189 on:** August 16, 2018, 09:19:33 PM »

I did a little reading about valve design, the reason for the concave surface is so it takes very little pressure to knock the valve open as only the outer edge of the poppet is making a seal. Apparently this is not an uncommon design.

Sad to say my parts didn't arrive today, Ryan emailed on Monday that the parts were being shipped that day, supposed to have been shipped three day but UPS never showed, maybe tomorrow.

tracker1955 · « **Reply #190 on:** August 16, 2018, 09:32:57 PM »

Paul, how far in did you screw the valve spring retainer disc? How many threads did you leave showing or did you just guess at the depth? I had asked Ryan this question but didn't get an answer on that one. I did put locktite on the brass poppet guide as it was already loose, didn't want it to get bent by the hammer impact.

Rat Sniper (AKA: PaulT58) · « **Reply #191 on:** August 16, 2018, 09:41:21 PM »

Quote from: tracker1955 on August 16, 2018, 09:32:57 PM

Paul, how far in did you screw the valve spring retainer disc? How many threads did you leave showing or did you just guess at the depth? I had asked Ryan this question but didn't get an answer on that one. I did put locktite on the brass poppet guide as it was already loose, didn't want it to get bent by the hammer impact.

Tom, I have asked the same question, waiting to see if I get an answer. I suspect he probably doesn't know. I have my disc tightened to about 3 threads inside the valve body are showing, so not much beyond flush. I put a drop of locktite on both the brass guide and the disc. So far it's holding air and shooting good. It like the Winchester Domes and H&N Sniper Mediums the best.

Hoople · « **Reply #192 on:** August 16, 2018, 09:49:53 PM »

DAR poppet valve fix.
While I was writing up this post, I noticed some of you received a new valve with a conical spring; I hope they fix your leaks, but my gun came with the conical spring and developed a leak after about 3 weeks. If after replacing your valve and spring, you still have a leaking valve this post may help.
I determined my valve was leaking by removing the air tube from gun, airing it up and immersing it in a bucket of water. There was a steady stream of bubbles coming from the transfer port and the end of the poppet valve. No other leaks were visible.
I degasses the tube via the small set screw on the valve closest to the tube. I then removed the valve assembly from the tube. I then disassembled the valve assembly. My gun did have the conical spring.
The first thing I noticed, the spring was canted on the valve and the end coil had gouged into the plastic to such a degree that there was a thread of plastic hanging from the spring and valve. First, I used a small Swiss file to knock off the sharp edge on the end of the spring. Then I ground the top coil down until it was sitting flat on the valve. Though maybe not as important, I also ground the large end of the spring flat.
Next, I used a Dermel and 600 grit lapping compound to seat the valve with the valve seat. To accomplish this I used a Q-tip to apply some lapping compound onto the valve surface where it mates with the seat. I inserted the valve into the valve body with the end of the rod sticking out of the (oiled) guide bushing. I then chucked the rod into my Dremel (standard 1/8” collet), and held the valve body in one hand and turned on Dremel. The idea is to use the abrasive to mate the two surfaces, so pull the rotating valve into the valve seat. After about 30 seconds, I turned off tool, un-chucked stem, removed valve, reapplied abrasive, and repeated process. I didn’t want to overdo it so only did it twice. Apparently, it was enough.
I cleaned everything with Ballistol, rags and patches. Before reassembly, I lightly oiled spring, valve and valve stem with silicone oil. I then greased o-ring and put poppet valve assembly back into air tube. I then aired up air tube. As it was airing up, I dipped the valve end into water bucket; a steady stream of bubbles was coming from the valve. So, with the gauge end sitting on a foam pad, I took a hardwood stick and gave the valve stem that was sticking out a whack (recommended by another member) resulting in a loud crack, and a release of air. I then tipped the valve end back into the bucket of water; the bubbles had diminished. I repeated, and after three whacks, the valve had seated and no more bubbles.
Since I seated the valve, (three days ago) I have had no signs of leaks. I have aired it up three times and shot it down, aired it up, left it overnight each time and it has held air. As they say, your millage may vary, but it has worked for me (so far).

Hobbyman2007 · « **Reply #193 on:** August 16, 2018, 10:28:31 PM »

Hoople , that pretty much describes the process I use when I make new valve poppers from PEEK. Some sel up on the first attempt some take a few tries .

Hoople · « **Reply #194 on:** August 16, 2018, 10:50:06 PM »

Hobbyman, you lost me, I am clueless. lol. But I do prefer the term remodify.

Hobbyman2007 · « **Reply #195 on:** August 16, 2018, 11:19:31 PM »

Wow , I just reread my post . I swear I’m not dislexic. I’m gonna blame the auto correct on my phone . What I meant to say was that burnishing a valve poppet with an abrasive is usually a good practice even with a hard material such as PEEK. I however use low RPM with a cordless drill .

Wayne52 · « **Reply #196 on:** August 17, 2018, 01:01:38 AM »

Without a good airtank and adaptor I probably would have had a tough time sealing both of mine up cause it takes a jolt of air to even seal the poppets IMO, when they're seated they're good to go until I degass them.
Next time just for the heck of it I'll try pumping one up by hand from the get go and see if I have any luck. Now that both poppets are broken in good it might just work fine but before break in I doubt it would be too easy.

Gertrude · « **Reply #197 on:** August 17, 2018, 01:17:30 AM »

Quote from: Wayne52 on August 17, 2018, 01:01:38 AM

Without a good airtank and adaptor I probably would have had a tough time sealing both of mine up cause it takes a jolt of air to even seal the poppets IMO, when they're seated they're good to go until I degass them.
Next time just for the heck of it I'll try pumping one up by hand from the get go and see if I have any luck. Now that both poppets are broken in good it might just work fine but before break in I doubt it would be too easy.

Yep, 100% agreed

Wayne52 · « **Reply #198 on:** August 17, 2018, 02:21:57 AM »

Ron there's probably a good chance that if these guns had been shipped with air in them there probably wouldn't be the poppet problems because that way the poppets would have had a better chance to seat better. I'll probably be buying the newer short 25 cal pellet mold that NOE is making and for sure I'm going to get their 22 cal pellet mold. I'll probably get the 22 cal first though.

Gertrude · « **Reply #199 on:** August 17, 2018, 02:37:32 AM »

we just received the next 4 that we ordered.
3 of those 4 are suffering from some various leaking issues.
we took 2 of those 3 apart yesterday. We are seeing some various discrepancies in the orings that I will detail after we investigate it a little more. what I will say for now is that it appears the chinese origs are "coming apart" or "splitting" rather that being torn/chipped/broken during assembly. Looks kind of strange. kind of like the orings are deteriorating under pressure.
Bad rubber compound (?) of the oring ? , ... I don't know yet.
I have exchanged a few emails with Ryan today, and he is also interested to learn what our findings will be. He is being very receptive and demonstrating very good customer service in a timely manner. I have no complaints with his service.
We may go see him this weekend, or next week, to show him our findings.

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More DAR bad luck

Author Topic: More DAR bad luck (Read 20515 times))