My Yong Heng finally back after months of waiting for parts

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Saltlake58

Member
Apr 9, 2015
2,907
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Utah, United States
Well, here goes the story:

Last fall, my Yong Heng with not all that many hours on it abruptly stopped in the middle of a fill. Turns out the top of the piston disintegrated, Since the only place you can get parts is Ali-Express, off to China for parts I went. Of course, ordering from Ali-Express is a minimum of 6 to 12 weeks for delivery. The piston parts came in after a couple months, so I set about rebuilding the compressor.

Got to the part where I fill it up with oil. Turns out the oil gasket shrunk and there is no way to get it to seal. Didn't realize that and leaked about 8 ounces of synthetic oil all over my work bench. Off to Chine for a new oil gasket. No, that wasn't fun. Fast forward 3 months. Finally get it back together.

However, it takes effort to setup the pump, fill the bucket and such, and such and since I'm moving, my eldest is moving, my youngest is moving and my middle child is moving (yes, we are coordinating 4 moves all at once and it's a nightmare), it took me a couple weeks to get the initial test setup.

I let it run for 5 minutes without load to break in the new piston. Great all seems to be working well.

Next, I attached the tank, turned on the pump, and low and behold, it won't build pressure, well it did get maybe 10 PSI, but no more.

Off to youtube to see if anyone had any ideas. and I found a video showing how to assemble the reed valve in the top assembly. It's a rube Goldberg, but after following the instructions, it now builds pressure and I filled my tanks for the first time in over 8 months.. So in case anyone else needs to reassemble the reed valve, here's the link:

https://www.youtube.com/watch?v=24sGXYkd4NY

Now, it works. Did my first fills in months! Now if I can just find time to go and SHOOT!

Enjoy, Ya All!
 
Don't feel like the Lone Ranger. I rebuilt an Air Venturi compressor and made the same mistake. The arrow head side of the reed valve has to face away from the exhaust hole out of the side of the cylinder head. The air hole in the side of the seal cap has to align with the air output hose. I had the reed valve correctly aligned but the cap was reversed and therefore no pressure could build. 

I also discovered that the split ring style high pressure piston rings from Tuxing don't seal in an Air Venturi compressor even though they are an exact fit. I have not been able to source Air Venturi compressor piston rings other than Pyramyd Air at $7 apiece which is outrageously over priced and out of stock until August or beyond. Burst disks at $5 apiece are also outrageously marked up, however the disks are easy to find on Aliexpress.
 
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Good to know others had the same issues. These are simple designs but information on how to do it right can be tough to find

About the only complaint I have with the process is the time it took for parts to come in. Two months for the piston and almost 3 months for the oil gasket. On the plus side, I was so distracted with family matters, it was really low on my priority list.

I did have fun putting it all back together. I'd rather it just have worked, but the whole purpose of the hobby is entertainment, and tearing things down and putting them back together is great entertainment to me. Granted, I was just about to throw in the towel and buy a new one.

The Yong Heng's can be a complete crap shoot. Some people report hours on top of hours on top of hours of service and still running strong. Others are getting (like me) 10 or 12 hours before some kind of catastrophic failure. I understood that going in. The compressor broke even cost wise before it broke, and now, I can actually start saving money on refills.

Having the compressor gave me the ability to tune my guns. Couldn't have done that going to the paintball shop every time I needed air. It was good to be able to tune, partially drain a tank, top off the tank and go back to work. Made it all possible.

These little compressors are So Worth It!

I'd recommend these to anyone wanting an independent air source
 
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did have fun putting it all back together. I'd rather it just have worked, but the whole purpose of the hobby is entertainment, and tearing things down and putting them back together is great entertainment to me. Granted, I was just about to throw in the towel and buy a new one.
Click to expand...

This quoted above; the time you enjoy wasting is not wasted time. Hope it was awesome -- if it 'aint broke, break it, and then make it even better or at least figure out how it works :) Sounds like you successfully repaired it and gained knowledge along the way. Well done!
 
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It's all about the learning. I bought a Marauder to learn the adjustments, and applied the Marauder lessons directly to an Impact. I learned to tear down the compressor, and learned that I can do it. Considering I'm a professional Desk Jockey, and don't really enjoy it, working with my hands is fun, I enjoy it, and sometimes I spend more repairing than buying new. It's all in whatever floats your boat!

LMNOP - Well said!
 
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