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Diesel engine testers need to be more sensitive because they have more excess air in the exhaust and less CO2. They require special fluid as a result. Otherwise, no bubbles is a good sign. I don't think those 318s were prone to head gasket failures. No bubbles is a more valuable result than no...

I recently had a Cat 3512 blow a head gasket. Despite a constant flow of bubbles through the tester it never turned colors. I even had the special diesel fluid. Were you getting bubbles through the tester? Here is one bubbling furiously and here is the head with soot stains where it was leaking.

You can always change it later. Now that the t-stat housing is open I strongly suggest filling the engine to the top of the t-stat housing, removing the water pump belt and running the engine.

If you open the t-stat housing, fill with water until it overflows, and run the engine with the belts off you may see bubbles indicating a leak.

Dishwasher detergent is part one and phosphoric acid is part two if you can't buy it locally. If you don't like using your own chemicals your local heavy duty diesel dealer has flushing kits.

My CUCV with a 6.2 (I know it's a different engine) had a blown head gasket. It only leaked one way. The radiator would hold pressure for months if I wasn't driving it. Pop the cap, burst of coolant. Engine ran fine otherwise. As it got worse it started overflowing the overflow. Anyways pulling...