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Hi i am new to diesels, i think i have a cracked head in my zd30. water is bubbling up out of the radiator when engine running, some air bubbles as well.

HI i have just purchased a D22 Z30 Nissan Navara, unfortunately it is bubbling water out of the radiator cap when removed, i suspect a cracked head, new to deisels i am unsure. and can i just replace the head or will it require a whole engine rebuild? The engine is making a high pitched...