On a head gasket, if one is leaking bubbles in the radiator reservoir while running will give it away. Also, if you find yourself adding water. As I recall that radiator has the baffle right up at the fill neck so it is hard to see water in the tank. Other thing you might do is smell the radiator. If it smells like something other than antifreeze then it possibly is a problem.
That engine is wet sleeved. Has a gasket to seal off the water on top, then a weep hole, then another gasket of the bottom to seal the crank case. The weep hole is there deliberately to warn you when a seal is leaking, type of fluid tells you which gasket is at fault.
And, as mentioned, pin holes do occur in wet sleeve engines and that lets coolant into either the combustion chamber, the crankcase or both.
JD makes a pint bottle of coolant treatment that I used to put in mine every spring which is supposed to reduce the "ions" in the water which are supposedly responsible for the pin holes. I had an OTR truck with a 800 cu. in. Cummins and it had a filter in the water line called an "ionization filter" for the purpose of preventing the problem.
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