The Stovebolt Site Forums The Shop Area Engine Shop Water pump, overheating questions

There is another possibility. Many of the later 235’s installed into the AD trucks ran into the issue of the water pump being to long. Some just moved the radiator forward, like in my case but others calculated the interference, and pressed the fan hub further onto the pump shaft, then cut off the excess. Since your radiator is in the original position, this may be your case.