4TNV88 Diesel Engine Parts 129601-11700 Engine Block Head Excavator Cylinder Head

Excavator Engine 4TNV88 Cylinder Head 129601-11700 Diesel Engine Parts Excavator Cylinder Head

Cylinder Head for Excavator Engines The cylinder head ranks among the most critical heavy-duty precision components of an engine. Mounted on the upper part of the cylinder block, it seals the cylinders, constitutes combustion chambers, integrates the valve train along with cooling and lubrication passages, and directly determines the engine’s power output, fuel efficiency and operational reliability. Core Functions Sealing the Combustion Chamber: Closely attached to the cylinder block and cylinder head gasket, it endures a combustion pressure of 10–15 MPa and high temperatures ranging from 600 to 900 °C, preventing the leakage of air, water and oil. Valve Train Mounting Base: It holds valve seats, valve guides, intake and exhaust valves, valve springs, rocker arms and camshafts (overhead-cam type), controlling the timing of intake and exhaust. Integrated Cooling and Lubrication System: With internally cast water jackets for heat dissipation and oil galleries for lubricating valves and camshafts, it avoids thermal deformation and component wear. Fuel Injection Mounting Carrier: The cylinder head of diesel engines is machined with injector mounting holes to guarantee the precise injection of high-pressure fuel into the combustion chamber. Common Faults Surface Distortion / Warpage: Resulting from overheating, uneven bolt torque or damaged cylinder head gaskets, symptoms include air leakage, power reduction and high coolant temperature; grinding repair is needed if flatness exceeds 0.10 mm. Cracks: Cracks occur around water passages, oil galleries or valve seats, causing water, oil and air leakage; flaw detection is required, and severely cracked cylinder heads should be discarded. Valve Seat / Guide Wear: Long-term high-temperature impact leads to seal failure, valve noise and oil consumption; replacement of seat inserts and guides as well as valve lapping is needed. Injector Bore Corrosion: Induced by fuel leakage and high-temperature gas erosion, it results in poor sealing and insufficient power; repair by bushing or cylinder head replacement is necessary.

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