Is Removing the Cylinder Head Considered a Major Overhaul?

[CatherineDella]

Removing the engine cylinder head is considered a major overhaul. The engine consists of: valve cover, cylinder head, cylinder block, and oil pan. A major overhaul refers to the process where a new car or a car that has undergone a major overhaul, after traveling a certain mileage or period of time, undergoes inspection, diagnosis, and technical evaluation, and then uses repair or replacement of car parts to fully or nearly fully restore the vehicle's technical performance. The content of a major overhaul includes: 1. Replacing engine valves, pistons, bearing shells, cylinder boring, and crankshaft grinding; 2. Replacing internal transmission components such as gears, gear oil pumps, bearings, and sealing gaskets; 3. Replacing intake and exhaust components, including intake manifold, exhaust manifold, three-way catalytic converter, and fuel lines.