[jcus]

Jim,

I am asking because I haven't had to touch one of these, yet. What model Tu Flo?  Water cooled?

The big question IS: is the water in the manifold coming from the compressor? Or is coolant getting into the manifold from the engine head and putting coolant into the compressor intake?

Its a tu flow 750, normal compressor except has water cooled head. Engine coolant comes from rear of engine
head through compressor head back to fwd engine head. Do not think Newell used many of these, had to get
one from freightliner in Maine. First time saw white smoke when leaving from a stop, so pulled over and found
eng. coolant leaking from gasket between comp head and body. Pulled comp air suction line and found some
coolant in it, thinking when running, boost pressure in manifold kept the water in the compressor and when
stopped no boost,  so water could go back up suction line and into manifold, causing white smoke on takeoff.
Put on new compressor and made it 50 miles before same thing happened again.
May be wrong but appears brake tank pressure was higher than before, but cannot see how anything downstream
of the compressor could cause this. After installing new comp., ran level up  and pumped brakes, pressure fell and
then built up again and dryer dumped. Pulled d2 off and hooked up electric compressor and filled tanks, at about
125 psi, d2 started passing air, which I think should unload compressor if hooked up.
After 2nd time, bypassed water to compressor and capped air comp suction on manifold, piped in electric comp and 
drove home. No white smoke and full boost, so believe water is coming from compressor and not some problem with intake manifold.
Plus good coolant leaks from head gasket area on both comps.
I am stumped.
Jim