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Photo of said compressor with 8 rib clutch pulley installed. You can typically use the 10 rib pulley the compressor comes with. This is not the adaptive bracket pictured, which is why I had to swap to an 8 rib pulley.
Don't give up. Have you guys checked to see what the Cummins 855 engine uses for a bracket in big trucks? Maybe it is a plug and play piece from Cummins? Was not the case for the A2 8.3 with the military accessory drive config, which is why I made the kit. Maybe I should look into this for...
As promised. Kit is done and now accepting orders: http://www.steelsoldiers.com/showthread.php?152952-M939A2-Cummins-6CTA8-3-A-C-Compressor-Mount-Kit-Factory-Serpentine-Belt-Driven&p=1859819#post1859819
A2 compressor mounts available by weeks end: http://www.steelsoldiers.com/showthread.php?152828-M939A2-A-C-Compressor-Mount-Kit-Pass-Side-Factory-Serpentine-Drive&p=1858525#post1858525
That kit is heavy, expensive, V-belt, and a big pain in the a$$. Moves your fan forward so it doesn't hit the new V belt, additional pulley bolts onto front of crank pulley, etc... I had the kit and sold it because I wanted to stay serpentine drive, and because it's price went up through the...
General rule of thumb for R134a is 2 times ambient temp, plus 20% on the high side. So, using 95F, you should be seeing about 230psi or so, and producing an air vent discharge of about 50F.