Tuxing double cylinder compressor - air leaking into crankcase

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Oct 2, 2015
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Hi all,

Again I need your help with this compressor.

I have rebuild it twice already and I have no clue on what's going on here.

It's leaking air into the crankcase and I get air and some blue smoke blowing out of the pressure release on the top.
Marked with red on the picture.

I have changed the piston rings and all the paper seals. I was careful not to scratch anything when changing them and watched for the correct orientation.
All screws are tight, checked and double checked.
It does build up pressure without any issues so that's good.
It doesn't overheat so cooling is OK.

After 2 rebuilds I'm completely at a loss on what to do next.

Any help you could provide would be greatly appreciated!

Thanks,
Walt

Screenshot_20250508_162817_Gallery.jpg
 
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May be unrelated but can you take a picture showing your crank case oil view window. From the picture I see it looks like you have too much oil in it. The oil level is only supposed to be half ways through the red dot. I overfilled mine once and had blue smoke fill the room.
I lowered the oil level and it fixed that problem..
 
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That's the oil breather thats circled in red. Air is SUPPOSED TO blow out of it. As "Avator" said, looks to me also that you've over filled your oil but hard to tell from that angle. Never fill OVER top of red dot in oil indicator window! There's a warning label just above it. BTW, oil seems to be really discolored (depending on which oil you use). Please respond re: type of oil & level to which you fill.
 
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First airgun compressor I bought was Tuxing. Worst investment I have ever made !! I chased problems and issues for almost two years. Before I left for AZ this past winter I gave it to a friend who is a far better mechanic/tech sort of guy than I. I told see what you can do with it since he was laid off for the winter. He screwed around with it all winter. It will be canibolized or be a paper weight. all I am keeping from it Is the filter system.
while in Mesa I bought a new Omega Air Chager from AOA. Now I am happy happy happy!!! I fillmy tanks faster and no problems or drama.
 
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inverted said:
Hi all,

Again I need your help with this compressor.

I have rebuild it twice already and I have no clue on what's going on here.

It's leaking air into the crankcase and I get air and some blue smoke blowing out of the pressure release on the top.
Marked with red on the picture.

I have changed the piston rings and all the paper seals. I was careful not to scratch anything when changing them and watched for the correct orientation.
All screws are tight, checked and double checked.
It does build up pressure without any issues so that's good.
It doesn't overheat so cooling is OK.

After 2 rebuilds I'm completely at a loss on what to do next.

Any help you could provide would be greatly appreciated!

Thanks,
Walt

View attachment 561175
Click to expand...
Like a car, blowby into the crankcase says your rings arent sealing Or in my case the 2nd stage of the stacked stages had cracked the 1st stage piston top but the volume under the pistons closest to the crank case is normally moved thru that breather. I know on some legitimate dive compressors the rings are tapered and you have to observe proper orientation(as you say you have) . Blue smoke out of the case breather meant look for something for me. I ignored it and the big end of my connecting rod was quickly re clearanced into a paperweight.

Something is wrong, and I'd do a full disassembly, check and re assembly of what you have. You may be able to avoid grenading it, but it could be inevitable. Your issues are all the same as my issues with 3 Yong hengs.
 
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ndwind said:
First airgun compressor I bought was Tuxing. Worst investment I have ever made !! I chased problems and issues for almost two years. Before I left for AZ this past winter I gave it to a friend who is a far better mechanic/tech sort of guy than I. I told see what you can do with it since he was laid off for the winter. He screwed around with it all winter. It will be canibolized or be a paper weight. all I am keeping from it Is the filter system.
while in Mesa I bought a new Omega Air Chager from AOA. Now I am happy happy happy!!! I fillmy tanks faster and no problems or drama.
Click to expand...
As the recipient of this compressor if there are parts needed from this one that could be used let me know as ill have the full compressor just missing the filters the main issue is i belive it needs the whole high pressure head assembly. Electronics case an cooling system seem good
 
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I don't have a Tuxing but a YH.
So far I learned anything wrong with air pressure I don't troubleshoot anymore.
The heat kills the piston rings first.
I just replace the entire piston kit assy, takes me less then an hour with a coffee and beer.
The cost is about $50-60 for each, and so far I replaced a third time, about one a year. I still have four BNIB piston kits in my spares crate.
 
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You guys were right, oil level was a bit high but not by much.
When I poured new oil in few months back it was really cold so it was settling slower than I thought. I'm always careful about this things but obviously got it wrong this time.
But, this was a new oil after rebuild with maybe 10 minutes of work time and colour is worse than the old oil which I've changed after 2.5 hours of work time.

I'm using Bauer diving compressor oil so oil itself is not an issue.

Everything is still the same even after lowering the oil level. It still blows blue smoke out of the breather.
Mind you, there's not a lot of smoke and it's visible only when I point a flash light at it, under normal workshop lighting it's not visible so I may have this problem for longer than I think I do.
I have topped up my 6.8L bottle two times this week from 260-270 bar up to 300 bar without any issues.
But, there is evidently a problem and potential bigger malfunction waiting to happen.

In any case, after two cylinder rebuilds, there's no point in rebuilding them for the third time. I'll buy both new cylinders with all the parts and change them completely.

Only question is when, my spring vacation is over, little free time that I have on my hands I spend rebuilding my lathe which won't be finished any time soon. :cry:
 
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inverted said:
You guys were right, oil level was a bit high but not by much.
When I poured new oil in few months back it was really cold so it was settling slower than I thought. I'm always careful about this things but obviously got it wrong this time.
But, this was a new oil after rebuild with maybe 10 minutes of work time and colour is worse than the old oil which I've changed after 2.5 hours of work time.

I'm using Bauer diving compressor oil so oil itself is not an issue.

Everything is still the same even after lowering the oil level. It still blows blue smoke out of the breather.
Mind you, there's not a lot of smoke and it's visible only when I point a flash light at it, under normal workshop lighting it's not visible so I may have this problem for longer than I think I do.
I have topped up my 6.8L bottle two times this week from 260-270 bar up to 300 bar without any issues.
But, there is evidently a problem and potential bigger malfunction waiting to happen.

In any case, after two cylinder rebuilds, there's no point in rebuilding them for the third time. I'll buy both new cylinders with all the parts and change them completely.

Only question is when, my spring vacation is over, little free time that I have on my hands I spend rebuilding my lathe which won't be finished any time soon. :cry:
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When you do a full rebuild. If you don’t have the new style head. Buy the correct cylinder and piston for the Yong heng style hi pressure head sold by tuxing. 80 and new reed, and reed plate for low pressure, ~$10, new check seal for aluminum block$10. New piston rings for low pressure side piston $5. And you have a new pump. But normally you have to only change low pressure side piston read valve, and reed plate. $10 for 10 hi pressure side piston rings, and and new seal for check, and it’s good to go
 
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inverted said:
Maybe in a more civilized western world.
Where I live in SE Europe, that's not an option,
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That statement is misleading. When places over here offer a replacement insurance on a product it doesn't last forever and has conditions that overlap with the factory warranty. Typically, only good for one replacement (that may be reconditioned itself) and in no way shape or form gifts someone with free lifetime replacements for a single purchase. Places would go out of business quicker than they already do if they were that dumb.
 
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IndyDurtdigger said:
That statement is misleading. When places over here offer a replacement insurance on a product it doesn't last forever and has conditions that overlap with the factory warranty. Typically, only good for one replacement (that may be reconditioned itself) and in no way shape or form gifts someone with free lifetime replacements for a single purchase. Places would go out of business quicker than they already do if they were that dumb.
Click to expand...
I'm aware and would presume that with extended insurance you get some value for you money back but not lifetime replacements.
Unfortunately, where I live, I can't get any kind of extended warranty.
 
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