3TNV76 Diesel Engine Parts 119717-11740 Cylinder Head For Excavator Engine

Excavator Diesel Engine Parts 119717-11740 Cylinder Head for 3TNV76 Excavator Engine Cylinder Head

Excavator Engine Cylinder Head Part As a key heavy-duty precision component of an engine, the cylinder head is mounted on top of the cylinder block. It seals the cylinders, forms combustion chambers, integrates the valve train and cooling-lubrication channels, and directly influences the engine’s power output, fuel consumption and stability. Core Functions Combustion Chamber Sealing: It fits tightly with the cylinder block and cylinder head gasket, withstanding combustion pressure of 10–15 MPa and high temperatures of 600–900 °C to prevent air, water and oil from leaking out. Valve Train Base Structure: It is equipped with valve seats, valve guides, intake and exhaust valves, valve springs, rocker arms and camshafts (for overhead-cam engines), 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 avoids thermal deformation and wear of moving components. Fuel Injection Installation Point: Diesel engine cylinder heads are processed with injector mounting holes to ensure that high-pressure fuel is accurately injected into the combustion chamber. Common Faults Surface Distortion / Warpage: Caused by overheating, uneven bolt torque or burned cylinder head gaskets, it causes air leakage, reduced power and high water temperature; resurfacing is required if 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 necessary, and severely cracked ones are to be scrapped. Valve Seat / Guide Wear: Long-term high-temperature impact leads to poor sealing, valve noise and oil burning; it is necessary to replace seat rings and guides and lap the valves. Injector Bore Corrosion: Triggered by fuel leakage and high-temperature gas erosion, it leads to poor sealing and insufficient power; bushing repair or cylinder head replacement is necessary.

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