Check with the cap off if you have air bubbles in the coolant . If so , probably a precombustion chamber with a rust hole in it letting compression into the water jacket . Pre coms screw out on the head to replace , so no need to remove head .
you never mentioned what year D4.
if it is an old girl, if you overfill the radiator it will of course expand when the engine heats up and spew a little out the overflow pipe.
start the main engine, turn off the pony (if it has one) and look for bubbles coming up through the radiator.
it a d47u not sure of the year
Welcome Javan, let us know the serial number and we will tell you the year it was built.
regards
Mike
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