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Swamp Donkey Called it. Faulty primary air pressure gauge. Replace the leaky petcocks with shutoff valves, screwed on a gauge and all of the tanks read 120PSI. The up side, is that my air system should be good to go for a long time now! Not much I didn't fiddle with. Glad I got that other...

Thought that looks more like 10 lbs? Again, not sure if its a big enough difference to matter. Will check the tanks individually tomorrow. Swapping the gauges is also a good idea. Thanks. Assuming I find that the gauges are reading correctly, any ideas on what else to look at?

Swapped out the PPV with another truck, checked all the one-way valves for the secondary air tanks, and this is still what I have. Is this an acceptable difference in pressure? I'm running out of ideas...

Here's what I've been working on over the last few days: Added shutoff valves for the coolant running to the air compressor head, so it can be serviced without pissing all over. Also, used 5/8'' hose instead of 1/2'' so things might stay a bit cooler. Put in a fan actuator out of another...

I've had two trucks so far with the problem. Am wondering if there is a better air compressor that would bolt on?

Been using cummins part #4920062 which is a fiber gasket. The other pic is a side of the road fix. That one actually lasted the longest! Troubleshooting today, I did notice a VERY slight leak near the fan clutch hub while the motor was not up to temperature. Stole a fan actuator valve off...

Racked up a bunch of miles on my 923a2 converted into a 931 over the last year, but recently have ran into some issues with the air system. Started off with a bad head gasket that I replaced, and a thousand miles later it looked like this: Fixed that, but had it fail two more times since...