This is a cylinder head gasket, part number HD46651350WIN-1 (also Voe16677979), designed for the engine in various Volvo compact excavators. It creates a seal between the cylinder head and the engine block, preventing combustion gases from escaping and coolant/oil from entering the combustion chambers. Made from multi-layer steel (MLS) or composite materials, it withstands extreme temperatures and pressures far better than a degraded gasket. Symptoms of failure include white smoke from the exhaust, coolant loss, engine overheating, or a loss of engine power.
Always verify with serial number before ordering.
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Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
The first indication of a blown head gasket is often visible white smoke (steam) from the exhaust, indicating coolant entering the combustion chamber. If ignored, this can lead to coolant loss, engine overheating, and internal engine damage. The worst outcome is severe engine damage from overheating or hydrolock if coolant accumulates excessively.
Ensure the cylinder head and engine block surfaces are perfectly clean, flat, and free of any old gasket material or debris. Always follow the manufacturer's specified torque sequence and re-torque procedure for the cylinder head bolts.
Inspect the cylinder head for flatness and check the engine oil and coolant for signs of mixing when replacing the head gasket.