A cracked or leaking cylinder head can cause coolant loss, overheating, white smoke, and oil contamination, and it’s often confused with a failed head gasket. We pressure test cylinder heads on heavy-duty diesel engines to find cracks, porosity, and leaking passages so you know exactly what you’re dealing with before you commit to a repair. If a head fails the test, we can replace it or advise on your best options. Testing is done in our shop, and our mobile mechanic service can help with on-site diagnostics to determine whether the head needs to come off.