Medium and Heavy Trucks
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Hi my name is***** will be glad to help. Pressure test the cooling system and see if it holds pressure and look for any signs of coolant in the fuel or oil indicating a possible faulty injector cup, Head gasket failure, etc. . Was it only one cylinder that was fixed? If so verify your liner heights are in specs or the head gasket will not hold. Also, was the head sent out for pressure testing and magnafluxing for cracks? Let me know.
Thanks for the update
I recommend starting with a pressure test of the cooling system and also see if there is signs of coolant in the exhaust indicated by white ash at the ports, etc. and check to see if compression is getting past an injector cup.