6CT Diesel Engine Cylinder Block Excavator Cylinder Head Block

6CT Cylinder Block Excavator Cylinder Head Machinery Diesel Engine Part

Excavator Engine Cylinder Head As one of the most vital heavy-duty precision parts of an engine, the cylinder head is installed above the cylinder block. It seals the cylinders, forms combustion chambers, integrates the valve train and cooling-lubrication channels, and exerts a direct impact on engine power, fuel consumption and reliability. Core Functions Combustion Chamber Sealing: It fits tightly with the cylinder block and cylinder head gasket, bearing a combustion pressure of 10–15 MPa and a high temperature of 600–900 °C to avoid air, water and oil leakage. Valve Train Base: It is equipped with valve seats, valve guides, intake and exhaust valves, valve springs, rocker arms and camshafts (for overhead-cam models), regulating intake and exhaust timing. Integrated Cooling and Lubrication: Internally cast with water jackets (for heat dissipation) and oil galleries (for lubricating valves and camshafts), it prevents thermal deformation and wear. Fuel Injection Installation: The cylinder head of a diesel engine is processed with injector mounting holes to ensure the accurate injection of high-pressure fuel into the combustion chamber. Common Faults Surface Distortion / Warpage: Caused by overheating, uneven bolt torque or burned cylinder head gaskets, it leads to air leakage, reduced power and high water temperature; resurfacing is required when flatness exceeds 0.10 mm. Cracks: Cracks appear near water channels, oil galleries or valve seats, resulting in water, oil and air leakage; non-destructive testing is needed, and severely cracked ones must be scrapped. Valve Seat / Guide Wear: Long-term high-temperature impact causes poor sealing, valve noise and oil burning; replacement of seat rings and guides plus valve lapping is necessary. Injector Bore Corrosion: Caused by fuel leakage and high-temperature gas erosion, it leads to poor sealing and insufficient power; bushing repair or cylinder head replacement is required.

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