At 1800 the water pump pressure should be around 38 to 40 psi with or with rad cap on. First i will ask what kind of fan clutch does it have? The next thing is to put a low pressure gauge of 50psi on the side of the block into the coolant and not in the water manifold. This engine is a hard engine to troubleshoot for heating. Anybody good on Cummins Big Cam iv low flo overheating problems? This is what has been done so far This is a Cummins BC 4 400 lo flow Recon engine with about 30,000 miles so far we have replace radiator with a 4 row dimpled tube core, water pump, both themostats and the POS is still getting hot any help will be appreciated .Tony
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