This cylinder head gasket assembly is a core sealing component installed between the engine cylinder head and cylinder block. It seals the combustion chamber, cooling water passage and oil passage to prevent leakage of gas, coolant and engine oil. Made of multi-layer metal composite material, it maintains stable sealing performance under high temperature, high pressure and frequent thermal cycling during long-haul heavy-load operation. Each gasket undergoes dimensional inspection and air tightness test before delivery. It solves faults such as water channel leakage, oil seepage and gas blow-by, serving as an essential replacement spare part for engine overhaul.