Lubrication for Yong Heng rebuild?
- Thread starter FlexWagtail
- Start date
I'd use synthetic Air Compressor oil vice hydraulic oil. As far as the upper (high pressure) piston, rings and cylinder, use NO LUBE at all on that section. Just clean it well, ensure it is lint free and assemble dry. The lower (low pressure) piston, rings and cylinder just a very light coat of the air compressor oil. Better to have LESS than MORE on these HPACs...
Mike
Mike
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+1 on Mike's advice. The rings will wear in so you will want to take off the second stage housing after maybe thirty minutes of run time and clean off the carbon buildup. Then probably again after another thirty minutes.
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update: BIG FAIL
The piston rod on my Yong Heng seized. There is a dipper on the rod that mysteriously broke, thus depriving the crankpin of oil. I ordered a new piston assembly from Ali Express for only $20 BUT…… The new assembly second stage piston did not fit in the Yong Heng. The new part had 4 plastic rings, and the original had three. They looked identical in diameter, but in fact the new second stage piston was a few thousands too large. “Okaaaaaay…..” sez me. “We’re not done yet.” I took apart the new assembly and moved the new rod to my old original piston set to replace the original rod that seized. This time the reassembly went smoothly. But after about a 3 minute run under no load to wear in the new rod I got a catastrophic failure. The failure point was where the first stage and second stage pistons are connected. I tried hard, but I’m done with Yong Heng. Even if yours runs great for a while, it will need a rebuild. I could not find a reliable source of correct parts. Without that, you’re screwed at some point down the road.
Did I make a big mistake? I bought a Yong Heng compressor from China!![/QUOTE]https://www.airgunnation.com/topic/...mpressor-from-china/embed/#?secret=gWgcXFaT3k
The piston rod on my Yong Heng seized. There is a dipper on the rod that mysteriously broke, thus depriving the crankpin of oil. I ordered a new piston assembly from Ali Express for only $20 BUT…… The new assembly second stage piston did not fit in the Yong Heng. The new part had 4 plastic rings, and the original had three. They looked identical in diameter, but in fact the new second stage piston was a few thousands too large. “Okaaaaaay…..” sez me. “We’re not done yet.” I took apart the new assembly and moved the new rod to my old original piston set to replace the original rod that seized. This time the reassembly went smoothly. But after about a 3 minute run under no load to wear in the new rod I got a catastrophic failure. The failure point was where the first stage and second stage pistons are connected. I tried hard, but I’m done with Yong Heng. Even if yours runs great for a while, it will need a rebuild. I could not find a reliable source of correct parts. Without that, you’re screwed at some point down the road.
Did I make a big mistake? I bought a Yong Heng compressor from China!![/QUOTE]https://www.airgunnation.com/topic/...mpressor-from-china/embed/#?secret=gWgcXFaT3k
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Hi, I just tried my brand new YH compressor and after about 10 minutes, it started making seizing noises, so I shut it down. I think the issue is going to come down to using the #46 hydraulic oil instead of #46 compressor oil. There could be a difference. I'm not sure what exactly went wrong yet, but I smelled a burned oil smell when I shut it off, or burned something. and the oil was gray when I drained it into a jar.
Your problem may have been that the new 2nd stage piston was over size and putting the old one into the new piston top hole, was probably too loose of a fit or maybe you didn't get the retaining clip ,or whatever holds it in, seated properly. Anyway, I would like to get your replacement connecting rod from you if it is still in good cond, or maybe the whole compressor, if you are done with it; if so give me a price. I'm in CA....where are you?
My email: stevealexanders at netzero.net. replace "at" with @ and remove spaces
Your problem may have been that the new 2nd stage piston was over size and putting the old one into the new piston top hole, was probably too loose of a fit or maybe you didn't get the retaining clip ,or whatever holds it in, seated properly. Anyway, I would like to get your replacement connecting rod from you if it is still in good cond, or maybe the whole compressor, if you are done with it; if so give me a price. I'm in CA....where are you?
My email: stevealexanders at netzero.net. replace "at" with @ and remove spaces
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Im interested in the broken? compressor.I would need the motor and block assemble .'
t need and the cast iron barrel.Thanks guy.Im in Washington state. 98671 [email protected] Willy
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