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Peashooter

Peashooter

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Apr 9, 2021
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So my 4 CYL Tuxing compressor stopped doing more than 240 BAR on the output.

Here is what i think:
1: it can not be the rings or the damn thing would vent down thru the crank case.
2: It cant be a leak to the outside as i would then hear it, at least when i turn off the compressor, this i assume would also be followed by a pressure drop in the not yet depressurized system after a bottle fill.

So i am thinking ( without finding any technical drawings or trouble shooting guide on the damn thing )
But looking at the Coltri it is a copy of, it have valves on each stage / cylinder, and i am thinking the one for the high pressure stage / cylinder is busted,and so it is essentially just passing on the 240 BAR from the #3 stage.

What is your take on my predicament ?

Also as i am a airgun addict,,,, there i said it.
I have ordered a Coltri compressor at a steeper price range, even if those too apparently do not have a service point in Denmark.
Though i would also assume i can fix most things given the proper documentation ASO, otherwise i suspect i have wasted about a decade of me educating myself.

Ordered the Coltri Mini Compact 100 EM to get the pressures going ASAP CUZ prime time soon and i have lead to sling.

THis of course mean,,,,,, no new rifle for me this year 😟
 
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Peashooter said:
So my 4 CYL Tuxing compressor stopped doing more than 240 BAR on the output.

Here is what i think:
1: it can not be the rings or the damn thing would vent down thru the crank case.
2: It cant be a leak to the outside as i would then hear it, at least when i turn off the compressor, this i assume would also be followed by a pressure drop in the not yet depressurized system after a bottle fill.

So i am thinking ( without finding any technical drawings or trouble shooting guide on the damn thing )
But looking at the Coltri it is a copy of, it have valves on each stage / cylinder, and i am thinking the one for the high pressure stage / cylinder is busted,and so it is essentially just passing on the 240 BAR from the #3 stage.

What is your take on my predicament ?

Also as i am a airgun addict,,,, there i said it.
I have ordered a Coltri compressor at a steeper price range, even if those too apparently do not have a service point in Denmark.
Though i would also assume i can fix most things given the proper documentation ASO, otherwise i suspect i have wasted about a decade of me educating myself.

Ordered the Coltri Mini Compact 100 EM to get the pressures going ASAP CUZ prime time soon and i have lead to sling.

THis of course mean,,,,,, no new rifle for me this year 😟
Click to expand...
This one? Ime with my old Yong heng that wouldn't go above that pressure the final stages might not be doing any work. I know my 4cyl came with rings, orings and Reed valves. Maybe there's just some crud on the sealing surfaces for the reeds(been the case on the many shop air compressors I've serviced). It's all fixable at some point and I bet if you had to you could source a compressor assy from tuxing. Did you use appropriate oil, and how many hours are on yours? I'd also check that cheesy blow off valve they have on them.

20241227_135738.jpg
 
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It is the TXSB model i have 230 volts 1 phase.

IMG_20250402_155824.jpg


I have used Coltri oil in it, aside for the first few fills where i used a " generic " compressor oil in it ( dont recall brand ) but it did say it should work on low as well as high pressure compressors.

It is only now i am knocking on the first oil change ( 25 H ) i think i am around 23 hours on it, so i need to drain it anyway.

I did notice on my previous fill that the compressor lagged a bit reaching 300 BAR, but dident think much of it at the time.

Tuxing sound very willing to send repair parts just need to figure out which ones, with a video, strange to me CUZ there is no visual indicators of trouble.
But ill shoot them a video Saturday when i go shooting again

It is a bit worrying that Tuxing do not have any technical DPT to refer one to, in a attempt of narrowing down the problem.

Only compressors i have worked on is on a ship, a house sized diesel go need quite a bit of air to start with, hence why you also find a big pressure vessel in most engine rooms.
Mind you not big overhauls, more shining up the plate valve parts ASO

Yes the cheesy 300 BAR valve, did slide itself out for a while, then i went drastically on its punk ass so it is not moving anywhere, and is not leaking CUZ it was the first thing that came to mind, also you can hear this if it is venting.
 
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Peashooter said:
It is the TXSB model i have 230 volts 1 phase.

View attachment 552485

I have used Coltri oil in it, aside for the first few fills where i used a " generic " compressor oil in it ( dont recall brand ) but it did say it should work on low as well as high pressure compressors.

It is only now i am knocking on the first oil change ( 25 H ) i think i am around 23 hours on it, so i need to drain it anyway.

I did notice on my previous fill that the compressor lagged a bit reaching 300 BAR, but dident think much of it at the time.

Tuxing sound very willing to send repair parts just need to figure out which ones, with a video, strange to me CUZ there is no visual indicators of trouble.
But ill shoot them a video Saturday when i go shooting again

It is a bit worrying that Tuxing do not have any technical DPT to refer one to, in a attempt of narrowing down the problem.

Only compressors i have worked on is on a ship, a house sized diesel go need quite a bit of air to start with, hence why you also find a big pressure vessel in most engine rooms.
Mind you not big overhauls, more shining up the plate valve parts ASO

Yes the cheesy 300 BAR valve, did slide itself out for a while, then i went drastically on its punk ass so it is not moving anywhere, and is not leaking CUZ it was the first thing that came to mind, also you can hear this if it is venting.
Click to expand...
If you've worked on ships then I'm certain you can find the issue. Now you have me worried about mine since I haven't hit the first oil change yet on the hour meter.

My guess would be the same as yours that the 4th stage is leaking down. Looking for Coltri parts I found they sell the 4th stage (4th quarter) independently. This might be the place to look. If you do open the machine up I'm very curious about the failure mode.
 
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When i get the new compressor i will not be in too much of a hurry, but will have to do something, CUZ i would then want to sell of this old one.

I am thinking 4000 Dkkr, that is 1/3 of what i paid for it myself, and that in turn is about 1/2 of the price on a new Hill compressor which IMO is the only local " cheap " compressor.
a MCH6 from coltri is like 24.000 Dkkr in this country,,,,, A LOT more than i paid ordering the new compressor abroad.
If i needed service from a AUTH Coltri dealer, and as shipping here is astronomical, well i could take a ferry to Sweden and get it serviced there, though also not cheap to do, or drive way down thru Germany to get a service there.

I have sailed 2 times as ship engineer, though i DO NOT have the education, so this was smaller ships in world wide traffic, so still only one to fix,,,,, everything,,,, me
 
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Peashooter said:
So my 4 CYL Tuxing compressor stopped doing more than 240 BAR on the output.

Here is what i think:
1: it can not be the rings or the damn thing would vent down thru the crank case.
2: It cant be a leak to the outside as i would then hear it, at least when i turn off the compressor, this i assume would also be followed by a pressure drop in the not yet depressurized system after a bottle fill.

So i am thinking ( without finding any technical drawings or trouble shooting guide on the damn thing )
But looking at the Coltri it is a copy of, it have valves on each stage / cylinder, and i am thinking the one for the high pressure stage / cylinder is busted,and so it is essentially just passing on the 240 BAR from the #3 stage.

What is your take on my predicament ?

Also as i am a airgun addict,,,, there i said it.
I have ordered a Coltri compressor at a steeper price range, even if those too apparently do not have a service point in Denmark.
Though i would also assume i can fix most things given the proper documentation ASO, otherwise i suspect i have wasted about a decade of me educating myself.

Ordered the Coltri Mini Compact 100 EM to get the pressures going ASAP CUZ prime time soon and i have lead to sling.

THis of course mean,,,,,, no new rifle for me this year 😟
Click to expand...
Don't assume you'd hear the leak, it took me a while to find mine on my 032. I'd think I heard it when running then nothing. It was the 0-ring on the back side of the right hand filter tower.
 
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No dont hear anything, i can stop it and it just sit there not really loosing any pressure, at least it have to be very slowly but i have not let it sit for a long time like that.
it will now not even do 200 BAR, CUZ i made a video for Tuxing running it pressurizing filters + fill hose.

They have now sent me drawings / part list and ask me to take it apart to look for fault.

 
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Peashooter said:
No dont hear anything, i can stop it and it just sit there not really loosing any pressure, at least it have to be very slowly but i have not let it sit for a long time like that.
it will now not even do 200 BAR, CUZ i made a video for Tuxing running it pressurizing filters + fill hose.

They have now sent me drawings / part list and ask me to take it apart to look for fault.

Click to expand...
At the end of the run, where was the condensation coming from? I can hear it and see it. The clatter while running could be guards but it doesn't sound right to me. I know that sounds silly but it's my gift with mechanical stuff 😁 it seems like it's capable of retaining some pressure, but not all of it. curious.
 
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Yeah it just started to drop, the last time i filled i did get to 300, but i did notice something was off.
Next time it would only give me 240, and now making the video for Tuxing it would only do 180 BAR

I also think its sound have changed.

It have always smoked a little back out the intake, but yeah i also feel like that have become more, just not noticed it during the winter months when i have been filling ( preheat compressor with diesel heater to not run it stone cold )

I am inclined to just take out pumping unit, and then take off the final stage cylinder, but i am still freaked it did 240 bar and then next startup only 180, CUZ if it was just finalt stage that do say 240 to 300 bar, then it should still do 240 on the remaining 3 cylinders,,,, but then 180 :unsure:
 
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jarmstrong said:
blowing smoke out the intake,,, sounds bad, burnt oil and/or dirty valve,

this is a no no to me,,," " generic " compressor oil ", unless I have studied it to be a di-easter based oil

you can warm the compressor by running it with the drain valves open,
Click to expand...
He's also in Denmark and it's cold. I wonder if it's legitimate smoke or condensation like your breath. It did look like a decompression fog to me for just a video. My guess is it's going to be the stage 4 piston oring and some dirty Reed valves/seats.
 
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Peashooter said:
No dont hear anything, i can stop it and it just sit there not really loosing any pressure, at least it have to be very slowly but i have not let it sit for a long time like that.
it will now not even do 200 BAR, CUZ i made a video for Tuxing running it pressurizing filters + fill hose.

They have now sent me drawings / part list and ask me to take it apart to look for fault.

Click to expand...
6gun said:
If you've worked on ships then I'm certain you can find the issue. Now you have me worried about mine since I haven't hit the first oil change yet on the hour meter.

My guess would be the same as yours that the 4th stage is leaking down. Looking for Coltri parts I found they sell the 4th stage (4th quarter) independently. This might be the place to look. If you do open the machine up I'm very curious about the failure mode.
Click to expand...
I believe you're in the right area. definitely internal or you would hear it leak.
 
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Okay so yesterday i ripped off the high pressure #4 stage, and it feel OK, piston in cylinder is like a suction fit.
Piston wear do however seem a bit irregular looking at the piston itself. looking into the cylinder i cant see much, maybe some wear on Cylinder wall too.

The big surprise was all the gunk on the one way valve after the #4 stage, it was gunked up good, and actually also some soot like black deposit on it.
Further more the seal, which is pretty much just a steel disk, well it sealing on the end of the cylinder liner, there are a indentation of that into the metal of the valve disk

On the + side the crank case lok really good not anything nasty as far as i can see, the oil was of course black but it have also run a few hours ( 20 hours or so on it by now )

Some accompanying photos for my next contact to Tuxing.

The stage #4 piston.

pioston.jpg


The return valve.

return valve.jpg


Return valve spring.

Return valve spring.jpg


Return valve seat 8 top of Cylinder #4

Return valve seat.png


The return valve disk ( top of it )

Return valve disk top.jpg


The bottom sealing side of the return valve disk.
Cleaned you can feel a indentation in the metal disk where it seal on the top of the cylinder liner.

return valve disk bottom.jpg


I did run the compressor before take down to make sure i did not overhear a leak, and it got to 170 BAR and then stopped going further up.
I let the compressor sit pressurized while i took of fan belt protection and fan protecting grill, loosened the motor and pulled off fan belt, and it had lost about 10 bar during that time, not unreasonable i would think i did not expect a entire compressor to be the end / seal all plug.
 
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Peashooter, those are good pics, thanks for posting them.
It's interesting that Tuxing sent drawings. I bought one of these four cylinder
units last July but before doing so I asked the manufacturer for drawings and
bella@sbtechen responded saying "we are not allowed to send schematic diagrams".
If it's not too much trouble, could you share what you have?

Ron
 
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