Yong Heng ruined my airguns.

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Sorry to hear about the damage. I've always suspected oil contamination with the Yong Heng compressors. All pistons and cylinders wear. The Yong Heng is no exception to the rule and I doubt any filter is bullet proof.

I refuse to use any compressor that incorporates petroleum products. I can handle a little water or white lithium but oil and high pressure air are a bad combination. Not only will compressed oil mix with water under high pressure but it creates carbon deposits that can ignite and explode in HPA tanks or air cylinders.
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I have to agree with everything you said.... If you look at the cheapest Bauer compressor it comes with 1 of those filters that cost several hundred dollars for the filter alone. I am not a scientist or an overly intelligent man but Ninja is very clear that oil in the tank is NO BUENO. Spend as much on a filter drier as you did on the compressor and you should be good. 
 
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I bought a Yong Heng air compressor..
It was used several times a night every single night for over a month to top off 2 or 3 of my pcp rifles directly.
Obviously, not a lot of run time, but, the cotton filter was checked at the end of each session, and perfectly fine.

Then I upgraded and threw together an 88 cubic foot scba tank. I needed to fill from Zero psi to 4,700 psi

I used the same Yong Heng compressor.
At the time, the only in-line-filtration was the little OEM moisture/oil separator - but, that's all I had, 
so, I just make sure to keep the run times between 10 and 15 min, let the unit cool down, and check the cotton..

In the end, total run time of just over 80 minutes, moist - but not wet cotton, only a slight petrol smell to the cotton, 
but absolutely no darkening..

Since then, I've used that same compressor and I've used my scba tank to fill/top off my guns countless times, 
and not once have I noticed any issues with moisture or oil..

Sam -

PS: Thinking about the problem, 
I'm curious if either the type of oil used, or over filling, or the piston rings could be contributing to the issue..
Those 3 things would certainly be possible factors.

I use Royal Purple compressor specific lube in my Yong Heng [as I have in all of my airbrush and shop compressors]
Also, keeping the heat down is obviously going to be key, to prevent moisture/oil, blow by, wear, warping, etc.

Just a thought..

 
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I’m using iso 46 hydraulic oil. I understand my guns aren’t technically ruined, but it’s going to be a long time for me to strip and clean every one. My compressor has around 1 hour total run time. I thought the extra desiccant filter would be enough, but obviously I was wrong. I believe this compressor is putting out more oil than it should. There is oil dripping from the regulator of my Impact. My tank has a considerable amount of oil in it as well. 
 
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Helimech, 

While Yong Heng 'suggests' using #46 hydro oil, 
a LOT of us actually recommend running 100. Royal Purple or Amsoil will work Much better!
[That is, if you actually still plan on using your compressor again after cleaning everything]

Man, that bites! I'm all for keeping things clean, maintenance, etc. 
but what you've described and shown is ridiculous, and yeah, it's going to be a bit of a pain to clean up..

Ballistol and blue shop towels are going to probably be your best bet..

As for your setup..
The redundant inline filters are a great idea, and that's exactly what I'm in the process of doing.
1st the OEM one, then the larger add-on, and, same deal.. cotton both ends and I'm using Molecular Sieve in the center..
Either way, that 'should' be more than enough to have kept out the majority of the contaminates..

As I mentioned before.. The only thing that I can think of that 'might' have caused the issue 
would be over-filling the oil-level, then the possibility of the piston rings maybe? 
Letting oil bypass the case, and get up through into the high pressure head..

I'm sure you probably don't want to use your gear to do any further testing, but, 
if you have a way to run the compressor later on - maybe with a psi load on it, 
or even using a quick-connect-plug to hold back the psi in the air lines..
Maybe that would help trouble shoot..

If there's that much oil, my curiosity would get the best of me, 
and I'd probably disassemble the top / high pressure head and inspect it inside..
Check for the obvious - oil, and then check to see if there is any ring damage, 
or damage / wear to the cylinder wall..

Either that, or if you think there's any type of warranty on your compressor, 
contact the seller/vendor and talk to them about a replacement..

The one that I went with has [or at least claims to have] a two year warranty.
It'd be really nice if you could just go the easy route, and get another one.

Sam -
 
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Sorry to read about your troubles.

Did you purged the compressor every 5 min while is working? Is amazing how much water and oil goes out. Is a must! (and usually there is no mention about it in reviews)

1 hour total time? Mine has about donno 1300 min that is around 22 hours (25 min per week x 52 weeks a year), and no problems and use hydraulic 46 only (changing soon to shell corena p100, same as royal p)

Btw I have an impact x and is shooting perfect YH air only for 10 months now, even if oil filters the gun is easy to clean tho, do not see much problem there.

Thanks for sharing your experience.


 
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Filtering compressed air is 2 part, oil/particulates and moisture. Always filter the oil out first, then the moisture. The farther away you can mount the filters the better, as that will give the moisture/oil time to cool/condense to droplets and be much easier to remove than vapor. Run you compressor in short bursts to avoid getting high outlet temps that won't allow moisture to condense. Using a cooling water bath before/or submerge the desiccant filter in an ice water bath might help. Also paying attention to keeping the temp of the compressor coolant water very low might also help. Just some thoughts from someone very familiar with compressors/gases/filters.

Filtration temperature, among other factors, has an significant impact on the filtering process. Filter efficiency is also impacted by the oil concentration in the compressed air as well as the amount of free water. Don't over fill your compressor with oil, not even a little. Efficiency specs in the filter specifications always applies to a specific air temperature, usually 70°.

jmo
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Good tips there! Thanks!
 
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I'm not trying to sound snotty so please don't take this the wrong way but proper filtration would have prevented this problem. I run a coalescing filter along with desiccant and molecular sieve and my guns are dry and clean after years of use.
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Well sure an error on the users part is cause for a machine to be bad mouthed. Now I am sure if he spent $4000 on a compressor and ran the same setup it would be a ha ha ha...I am so stupid look what i did....run filters people.....but nope, it is the machines fault.
 
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We had a MPG group,=Maintenance Preventive Group,"chit happens"and when t does it leads to down time.As it s said,"{ an ounce of prevention lends to?"

I have no high pressure compressor yet,butt when I get one I am going to do what most of you "users"have done,use plenty of the right filtering,oil and let things cool down when filling...yes we can learn from others and our own experiences and I always want more then the luck of the draw.

Sorry to hear of the problems that happened,seems you did what was right,yet chit happens: Our job is to prevent them from happening again.
 
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Sorry to hear about the damage. I've always suspected oil contamination with the Yong Heng compressors. All pistons and cylinders wear. The Yong Heng is no exception to the rule and I doubt any filter is bullet proof.

I refuse to use any compressor that incorporates petroleum products. I can handle a little water or white lithium but oil and high pressure air are a bad combination. Not only will compressed oil mix with water under high pressure but it creates carbon deposits that can ignite and explode in HPA tanks or air cylinders.
Click to expand...

I have to agree with everything you said.... If you look at the cheapest Bauer compressor it comes with 1 of those filters that cost several hundred dollars for the filter alone. I am not a scientist or an overly intelligent man but Ninja is very clear that oil in the tank is NO BUENO. Spend as much on a filter drier as you did on the compressor and you should be good.
Click to expand...

Tom Kaye from Technicor and the creator of the Shoebox compressor is also very clear on the dangers of contaminating equipment with petroleum based products. He knows far more than most on the subject and I'll take his word for it. To each his own but no matter how you see it compressed oil equals carbon deposits. Carbon deposits equal damage.
 
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I would have to ask if the OP is filling directly from the compressor. This of course is the easiest course of action with these inexpensive compressors, as it limits the duty cycle and the heat associated with a high duty cycle. The down side is that both oil and water will be included in the compressed air and will need to be separated out. If the compressor output is first sent to a vertical bottle and larger is better than smaller, contaminates will have an opportunity to settle out gravitationally before being used to charge your gun. This will also extend the life of your filters. Once a year I drain the 12 liter bottles and clean them.
 
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My Yong Heng went down last week so while it is down I decided to check my filter assy . I have the small filter along with the large gold filter with the cotton on each end and desicant in the middle. It has several hours of run time on it and I always check my fittings after filling my tank or guns to see if there is any moisture present. Never once did I find any moisture or oil. I went ahead and took it all apart and checked the desicant inside and it is dry, none of it is blue. There is a very faint spot on the cotton outer end but nothing else. I will be checking my guns and tank just to be safe. I had many more issues with moisture when I had a shoebox, but I didn't have as big a filter on it either. At any rate I am going to keep using mine as soon as my parts get here and I get it back together and I will be mounting my filter in the vertical position.
 
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Sorry to hear about the damage. I've always suspected oil contamination with the Yong Heng compressors. All pistons and cylinders wear. The Yong Heng is no exception to the rule and I doubt any filter is bullet proof.

I refuse to use any compressor that incorporates petroleum products. I can handle a little water or white lithium but oil and high pressure air are a bad combination. Not only will compressed oil mix with water under high pressure but it creates carbon deposits that can ignite and explode in HPA tanks or air cylinders.
Click to expand...

I have to agree with everything you said.... If you look at the cheapest Bauer compressor it comes with 1 of those filters that cost several hundred dollars for the filter alone. I am not a scientist or an overly intelligent man but Ninja is very clear that oil in the tank is NO BUENO. Spend as much on a filter drier as you did on the compressor and you should be good.
Click to expand...

Tom Kaye from Technicor and the creator of the Shoebox compressor is also very clear on the dangers of contaminating equipment with petroleum based products. He knows far more than most on the subject and I'll take his word for it. To each his own but no matter how you see it compressed oil equals carbon deposits. Carbon deposits equal damage.
Click to expand...

Tom Kaye? Airgun Designs? I did not realize he made the Shoebox. Tom is an amazing Engineer and a great person. I will look into the Shoebox a little more now. 
 
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I understand I must have gotten a bad compressor. I am using the ISO 46 oil that is recommended. My compressor had just shy of a hour run time on it. I only ran it for 20 minutes at a time before I let it cool down when filling my bottle from 0. With my additional filter, this should have never happened.
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True, and thanks for sharing. Your input is VERY important to understand this type compressors and experiences with them, and what can go south...they sure work, but as we know QA on this Chinese compressors are far from good sometimes. Thanks again for your time. 
 
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