Death of my Yong Heng

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Saltlake58

Member
Apr 9, 2015
2,907
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Utah, United States
It is with great sorrow that I announce the death of my Yong Heng compressor. It appears to have had a fatal seizure with critical parts malfunctioning. In other words, it was running, it shuddered, it stopped and hummed. I suspect the motor died.

While I am sad at the passing of my dear friend and compressor, must say it paid for itself in the past 9 months I've had it. tank after tank of air, on demand and saving cash every time I used it.

I don't intend to order another one just yet, might wait till next spring. With winter coming, using it in my area might prove problematic. Spring will fix all that again!

I'll begin the autopsy shortly, but for now, back to the paintball shop for air. Sad really, but Mr. Yong Heng worked his heart out, and it stopped. I'll miss him!
 
I'd guess a crank bearing failure.
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Possible. There has been a report about the tiny oil stirrer on the end of the connecting rod breaking off resulting in cutting off of oil supply to moving parts and seizing of the connecting rod "bearing". Actually the connecting rod does not have any ball bearing or bushing but just a hole on the body of the rod, The aluminium of the rod rubs directly against the steel pin on the crank shaft so if there is no oil, seizure can easily occur. 
 
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Autopsy Results:

The motor, crankshaft and bearings are just fine. I could spin the assembly until it hit top dead center. Right before TDC, it stopped. I reversed, and it stopped right before TDC going the other direction.

Removed the cylinder head and pulled the top off. Bits of brass were all over the top of the piston. Looks like the top of the piston broke up into little pieces. the bits piled up on top and jammed the whole thing enough to stop it. Cylinder still looks smooth, will go out in daylight tomorrow and take a better look.

So, off to buy repair parts. Looks like a new piston assembly is required for this one.

Oh, and working hours is under 10 hours. Pretty pathetic, but whatever. I run it about 8 minutes at a time filling the 88 cubic inch bottles from 2500 PSI to 4500. Sometimes only to 4000. I'll drop Yong Heng a note and see if they get back to me.
 
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.... the top of the piston broke up into little pieces. the bits piled up on top and jammed the whole thing enough to stop it....
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This is the third or fourth time I see reports about the 2nd stage piston breaking up. I would suggest you to check the reed valve at the top of the 2nd stage cylinder as well. That piece of thin metal could have been deformed after being hit by the debris.

1569294415_9426472655d89884f21f9a6.08156785_x.jpeg


1569294437_8203522045d898865cc4dc4.05205733_y.jpg


Photos source : 

https://www.airgunnation.com/topic/dang-yong-heng/

https://www.airgunnation.com/topic/yong-heng-8/
 
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whatever the cause, I ordered a couple of the piston ends tonight. Three weeks or so to get here from half way round the earth. Until then, compressor is down. Oh well, I guess $11 and down for a month is better than a new compressor.

At least these things are easy to work on.

Now, if I can just get all the parts back together when the parts come in . . . . . . 
 
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...Now, if I can just get all the parts back together when the parts come in . . . . . .
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You may want to take the chance the replace the first-stage piston with the new version one which has got a thicker top hence less prone to breaking. You may also want to replace some of the O rings. The one on the check valve at the outlet is always the first one to break. It's hidden inside the compression fitting nearest to the outlet.
 
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