Yong Heng compressor ... I just bought 1 ...

[keefd]

1) I read the thread, but after a few fizzy beverages last night, I kinda sorta forgot.
2) RP is readily available locally.
3) I thought (mistakenly) that people were bashing RP motor oil (see point #1)
4) Centercut HERE said he uses RP without issue, but that doesn't mean it's correct.
5) I got caught up in the excitement of finally getting a high pressure air compressor, plus my first PCP air rifle arrives tomorrow.

[OleTomCat]

The High Pressure end doesn't get lubricated by the oil, the oil only lubricates the shaft at the bottom of the piston.  The only oil that gets to the HP end is what leaks by  the first stage piston and gets entrained in the air flow.

I wonder how good this is:


It's Royal Purple compressor lube, so it's not like running motor oil.

NO royal purple is not designed to run in HIGH PRESSURE COMPRESSORS ! period ! its made for low pressure compressors HUGE difference !  ...we have members on here that are seeing burning oil/carbon residue in the high pressure side of the compressor running royal purple !  …. go back ,and read this thread  , why on earth would you buy royal purple that cost the same price over chemlube 751 that is designed for this high pressure compressor ? …. 

[Dan H]

The High Pressure end doesn't get lubricated by the oil, the oil only lubricates the shaft at the bottom of the piston.  The only oil that gets to the HP end is what leaks by  the first stage piston and gets entrained in the air flow.

I wonder how good this is:


It's Royal Purple compressor lube, so it's not like running motor oil.

NO royal purple is not designed to run in HIGH PRESSURE COMPRESSORS ! period ! its made for low pressure compressors HUGE difference !  ...we have members on here that are seeing burning oil/carbon residue in the high pressure side of the compressor running royal purple !  …. go back ,and read this thread  , why on earth would you buy royal purple that cost the same price over chemlube 751 that is designed for this high pressure compressor ? …. 

HA ! HA !  yes the upper cylinder gets lubed by the oil that is in the crank case , it works its way up ,and if you buy the right kind it does its job LOL ! 

[keefd]

Dan,

Is there anywhere locally I can buy the correct compressor oil?
It seems like there's only ebay and filtertechs plus 1 other small wegbsite. Shipping costs are horrible.

[Dan H]

Dan,

Is there anywhere locally I can buy the correct compressor oil?
It seems like there's only ebay and filtertechs plus 1 other small wegbsite. Shipping costs are horrible.

I dont know about your area , I had to order mine , and you should do the same even with shipping its pretty much the same price as royal purple , if you have a hand pump use it until the oil gets there , you have to wait for shipping  the air compressor anyway , like I said before order the oil now ,and it will most likely get here the same time or before the compressor ….

[keefd]

If you go here:

https://www.bargainmarge.com/751-Chemlube-Quart-Synthetic-Compressor-Vacuum-Pump-Oil-Chemlube-751-qt.htm

It's about $1.50 cheaper than the ebay price, and cheaper than the Amazon price. It comes out to $33.45 for a quart or just under $50 for a 1/2 gallon if you include shipping in the calculation.

edit - Filtertechs has their 751 oil for $29.75 including shipping for 1 quart.

[OleTomCat]

How does it work it's way up, the shaft is not hollow and ends at the bottom of the first stage piston, the second stage piston is attached directly in the middle of the first stage and is also solid, the only oil that gets to the second stage is carried by the air that is compressed and gets by the oil separator after the first stage.  I work on machinery for a living, I've rebuilt two of these.

The High Pressure end doesn't get lubricated by the oil, the oil only lubricates the shaft at the bottom of the piston.  The only oil that gets to the HP end is what leaks by  the first stage piston and gets entrained in the air flow.

I wonder how good this is:


It's Royal Purple compressor lube, so it's not like running motor oil.

NO royal purple is not designed to run in HIGH PRESSURE COMPRESSORS ! period ! its made for low pressure compressors HUGE difference !  ...we have members on here that are seeing burning oil/carbon residue in the high pressure side of the compressor running royal purple !  …. go back ,and read this thread  , why on earth would you buy royal purple that cost the same price over chemlube 751 that is designed for this high pressure compressor ? …. 

HA ! HA !  yes the upper cylinder gets lubed by the oil that is in the crank case , it works its way up ,and if you buy the right kind it does its job LOL ! 

[keefd]

...the only oil that gets to the second stage is carried by the air that is compressed and gets by the oil separator after the first stage. 

I don't work on machinery nor am I an engineer, but isn't that what's happening, causing dieseling and carbon fouling in the second stage?

When you rebuilt yours, did you see any fouling in the top end?

[OleTomCat]

The fouling is from carryover, not circulation, the top end is not lubricated by the lower end oil.  No there was no carbon fouling, the problem with the two I had to rebuild was lack of cooling causing the brass to breakdown and the second stage piston to come apart.

I received both of my compressors second hand and had to work on them as they came to me broken.

...the only oil that gets to the second stage is carried by the air that is compressed and gets by the oil separator after the first stage. 

I don't work on machinery nor am I an engineer, but isn't that what's happening, causing dieseling and carbon fouling in the second stage?

When you rebuilt yours, did you see any fouling in the top end?

[Dan H]

How does it work it's way up, the shaft is not hollow and ends at the bottom of the first stage piston, the second stage piston is attached directly in the middle of the first stage and is also solid, the only oil that gets to the second stage is carried by the air that is compressed and gets by the oil separator after the first stage.  I work on machinery for a living, I've rebuilt two of these.

The High Pressure end doesn't get lubricated by the oil, the oil only lubricates the shaft at the bottom of the piston.  The only oil that gets to the HP end is what leaks by  the first stage piston and gets entrained in the air flow.

I wonder how good this is:


It's Royal Purple compressor lube, so it's not like running motor oil.

NO royal purple is not designed to run in HIGH PRESSURE COMPRESSORS ! period ! its made for low pressure compressors HUGE difference !  ...we have members on here that are seeing burning oil/carbon residue in the high pressure side of the compressor running royal purple !  …. go back ,and read this thread  , why on earth would you buy royal purple that cost the same price over chemlube 751 that is designed for this high pressure compressor ? …. 

HA ! HA !  yes the upper cylinder gets lubed by the oil that is in the crank case , it works its way up ,and if you buy the right kind it does its job LOL ! 

You already answered your own question LOL ! ,and  any oil that gets to the second stage comes from the crank case no matter how it gets there LOL !

HERE is your own answer to your own question LOL ! = 

" The only oil that gets to the HP end is what leaks by  the first stage piston and gets entrained in the air flow."   

that's kinda of a NO BRAINER ! LOL !     there is no pump that pumps oil to the second stage LOL ! other than what gets threw  the first stage piston LOL!  and no little green men carrying it up to the second stage either … hope this helps you out ...

[E30_S50]

Hi All...sorry if I restate anything already said...I skipped the last couple pages of the thread.

I've had a yong heng for a couple years now and I've only filled my large carbon tank with it...right up to 4500psi multiple times.  I've run er pretty hard with no problems...here's what I generally do:

1.  Change the oil A LOT

2. Whenever I start or stop the compressor I open both bleeder screws first. 

3. While filing, I crack both bleeder screws for a quick 1/2 second about every 4-5 minutes to let out any accumulated oil/water.

4. Just like in the video, I use a SECOND FAN for extra cooling.

5. Lastly, and probably most importantly, I don't use the water pump or any water pump at all. I connected my hose spigot right to the inlet and run the outlet into my shop room drain. This keeps the pump very cool because I can force lots of cold water through it very fast. Works great.

[Rat Sniper (AKA: PaulT58)]

Matt, what oil are you running in yours?  That seems to be the current bone of contention in the room... 

When I received my 1st YH I asked the manufacturer what oil to use and was told to use SW46 Hydraulic Oil.  So I did.  It lasted a year.  I just got a Benjamin Recharge, the owner's manual says to use 5W40 oil.  Neither of these recommended oils are actually "compressor" oil.  I bought a quart of Royal Purple "Compressor" oil and was going to use it since it's made for compressors and now I'm hearing it isn't the right kind of compressor oil!  It sure would be nice if an actual manufacturer would make a recommendation on what the correct option is so we don't have to speculate...

[enazle]

Batch just hit Ebay $220 free shipping from USA

[Airnut]

Matt, what oil are you running in yours?  That seems to be the current bone of contention in the room... 

When I received my 1st YH I asked the manufacturer what oil to use and was told to use SW46 Hydraulic Oil.  So I did.  It lasted a year.  I just got a Benjamin Recharge, the owner's manual says to use 5W40 oil.  Neither of these recommended oils are actually "compressor" oil.  I bought a quart of Royal Purple "Compressor" oil and was going to use it since it's made for compressors and now I'm hearing it isn't the right kind of compressor oil!  It sure would be nice if an actual manufacturer would make a recommendation on what the correct option is so we don't have to speculate...

As I said in my first post heat and dirty oil is what kills these things. I typically try to stay with what the manufacturer calls for in this case its #46 hydro oil. I really dont think that the difference between SW46, royal purple, and Ester based oils really makes that much difference with these things its the heat that destroys the oil. Yes some oils can take more heat than others but control the heat and keep the oil clean, the rings will last longer with less blow by getting into the hp side and carboning up the 2nd stage. I don't care what kind of hydro/ester oil you run if you have enough blow by you will foul up the hp side. So gentlemen we can sit here and argue about whats best until our eyes fall out but the bottom line is if you keep it cool and the oil clean it really does not matter what oil you use as long as it isn't a petro based oil. I have read were some say that hydro oil will foam up in a splash type system. This is not accurate hydro oil and all oils for that matter have anti foaming agents to promote fast release of air from the fluid. Just my 2 cents worth!
Every body stay safe and healthy!!

[Rat Sniper (AKA: PaulT58)]

I used the SW46 in both YH compressors I owned because that was what the manufacturer recommended.  I changed it religiously every 3 months.  It never foamed and usually looked as clean coming out as it did going in, but I changed it anyway.  I ran a high volume pond pump to a 10 gallon fish tank full of water for cooling.  Both only lasted a year before they failed.  In hindsight, I should have added a small radiator and fan to the water line, but I'm not real sure if it would have helped any.  I had an aquarium thermometer on the tank and the temp never got above around 78F in the tank.

[Backyard Shootr]

Remember the commercial years ago? Motor oil is motor oil. 

[Airnut]

Paul
I to have read about lot of failures with these compressors regardless of what oil they were using. Thats why there is so much controversy over this subject.

[KnifeMaker]

Remember the commercial years ago? Motor oil is motor oil. 

And like most commercials, BS designed to get your business. LOL Not provide a superior product.

[keefd]

Paul
I to have read about lot of failures with these compressors regardless of what oil they were using. Thats why there is so much controversy over this subject.

Maybe I'm just stating the obvious, but the tolerances on the Yong Heng compressors - especially the YH clones - aren't exactly the tightest, and probably vary a bit.

One person runs Chemlube 751 exclusively but is unlucky and has a loose tolerance somewhere critical and winds up with a broke compressor. Another runs motor oil or hydraulic oil, but lucked out and their YH has good, tight tolerances and lasts a long time.

I'd wager that changing the oil often and keeping the cylinder cool counts for quite a lot, but given tolerances on these things even that's no guarantee.

[Dan H]

Remember the commercial years ago? Motor oil is motor oil. 

And like most commercials, BS designed to get your business. LOL Not provide a superior product.

NO way Mike its all the same !  stuff   .. it absolutely has nothing to do with what oil you run !  any cheaper than dirt recycled oil will lube this thing just fine !    … its like   whats all this huff about running super high quality diester oils ?  you know Mike I bet those guys at NUVAIR COMPRESSOR AND NORTHSHORE COMPRESSOR TECH GUY'S haven't the slightest clue as to what they are talking about ,.. just trying to make more money off us with their SNAKE OIL'S ...yeah that's it …

 infact I got some real old chain lube for my chain saw !  ...I think I will just use that stuff right there and save myself some BIG MONEY ! .. or hey I gotta better IDEA !    I will get some used motor oil that's in a jug from 1 of our cars that has like 10,000 miles on it ,and after all  it was synthetic it never wears out ,and after all it's FREE !    and 1 more thing I am going to do just to make sure !  ...  filter it with and old rag !  I found out about that 1 in a book called " BACK YARD TRICKS FOR IDIOTS "   in chapter 2 = never have to buy oil again ! 

NOW  you guys can " THANK ME VERY MUCH " for saving you all those hard earned COVID 19 STIMULUS DOLLARS ! ….