GX CS2 cylinder head getting hot. Do I care?

When I fill up my Avenger from depressurized to 4K psi, the cylinder head on my CS2 gets hot. Not just warm, but uncomfortably hot. The pump doesn't sound like it's laboring, the fans are running, everything looks okay. Should I be concerned?
Uncomfortably hot, is quite subjective. Any idea as to the temperature? My CS1 clone's maximum operating temperature is 90C /212 F which is burning the skin temperature. My liquid cooled New Warrior (uses a Yong Heng compressor internally) maximum temperature is 85 C/185F. Perhaps some of those numbers will be useful? FWIW, the CS3 is your CS2 in a more elaborate case, with pressure cutoff gauge.

I keep thinking of installing a temperature gauge or thermal cut-off on my CS3 but feeling the exhaust air temperature seems to be sufficient.
 
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Here is my thoughts on your situation. While bringing your airgun from empty to full pressure you believe the compressor may be running 'hot.' Heat is the killer of the GX CS compressors, so if you believe it is running hot it probably is. Take some time about the half-fill point to allow the compressor to cool down (10->15 minutes) and once it is cool to the touch start again. You can always point another external fan at the compressor unit to help with cooling but remain mindful of the compressor temperature. Resting the compressor a few minutes is cheep insurance when compared to a rebuild or purchasing a new unit
 
Uncomfortably hot, is quite subjective. Any idea as to the temperature? My CS1 clone's maximum operating temperature is 90C /212 F which is burning the skin temperature. My liquid cooled New Warrior (uses a Yong Heng compressor internally) maximum temperature is 85 C/185F. Perhaps some of those numbers will be useful? FWIW, the CS3 is your CS2 in a more elaborate case, with pressure cutoff gauge.

I keep thinking of installing a temperature gauge or thermal cut-off on my CS3 but feeling the exhaust air temperature seems to be sufficient.
I might spring for a cheap IR thermometer from Harbor Freight. Can never have too much junk!
 
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As long as the cooling fans are running and it’s not clinking out while topping off a gun then it’s probably fine.
I suspect I am just having an incident of pump hypochondria. I saw a video on Youtube where some guy said something like, "I just filled this 500cc bottle and it's barely warm!" I was thinking when I saw it, "That Avenger has a 165cc cylinder, and I could fry an egg on that pump." Granted, it would have to be a quail egg, but...
 
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I have run mine many times for 10-15 minutes at a time. It gets hot, I wouldn’t call it uncomfortable I guess. Still going strong after 1.5 years. I did replace the low pressure side seal on the piston even though it was still working good. The most apt thing for the heat to get to on that compressor is that low pressure ring. It’s cheap, readily available and super easy to change. All the piston parts are. I personally wouldn’t worry too much.
 
I suspect I am just having an incident of pump hypochondria. I saw a video on Youtube where some guy said something like, "I just filled this 500cc bottle and it's barely warm!" I was thinking when I saw it, "That Avenger has a 165cc cylinder, and I could fry an egg on that pump." Granted, it would have to be a quail egg, but...
Analysis paralysis. I was overly concerned with my air cooled cs4 and heat. In the end plane bearings gave out and it sounded like a rod knock and a large plastic piston ring broke on the low stage that I couldn't get at the time so I parted it out and got a huge compressor that can legitimately burn you if you touch the tubing before it reaches the moisture condensing tube.

I use lots of shop pressure compressed air and even at 150 psi the compressors get fried quail egg hot. One compressor is from 1964 and the other is from the 90s and they're still happy, hot and all. And I've got 16 hours problem free on the dive compressor. (sounds like low hours but it fills 92 inch bottles in a couple minutes)

I can appreciate somebody who monitors their machines. That's how you catch a failure and save it.
 
I might spring for a cheap IR thermometer from Harbor Freight. Can never have too much junk!
I had this one for years ( like 20) i bought to check gearboxes and motors on jobs .

I liked it over the pistol grip shaped kind cause it fit easy in my shirt pocket or any pocket and easy to put away due to small shape profile

OIP-2950714743.jpg
Well guess no longer available at harbor .. maybe something like it at Amazon?
 
I believe GX recommends a maximum of 30 minutes run time which you probably did not exceed. You might want to reduce that but as long as you don't exceed it your compressor should be OK.

It is a totally different compressor but the air lines on my Yong Heng get so hot I have given myself at least a second degree burn before touching them. It's a much more powerful compressor but it gives of a LOT of thermal energy. GX, by comparison, seems pretty tame.