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The cylinder head gasket, usually made of steel layers, seals the cylinder head to the engine block, preventing leaks of oil, coolant, or combustion gases. A failing gasket can cause coolant leaks into the cylinders, leading to overheating and white smoke from the exhaust. Leaks between coolant and oil passages can mix these fluids, causing engine damage. If the gasket fails between cylinders, you’ll lose compression and power. Replacing the gasket involves removing and cleaning various engine parts, including manifolds, timing belts, and valve covers. New head bolts are used, and they are tightened in a specific sequence to ensure proper sealing and engine function.

The cylinder head gasket, often constructed from multiple layers of steel, seals the interface between the cylinder head and the engine block. This gasket prevents oil and coolant leaks and ensures the combustion chamber remains sealed, preventing the escape of combustion gases. A failure in the gasket can lead to several issues: coolant leakage into the cylinder can cause rapid overheating and white smoke from the exhaust, while mixing of coolant and oil results in a “chocolate milk” appearance and severe engine damage due to poor cooling and lubrication. Additionally, a gasket leak between cylinders can cause a loss of compression, reducing engine power. Replacing a cylinder head gasket is a labor-intensive process involving the removal of intake and exhaust manifolds, ignition components, and possibly turbochargers. Timing belts or chains must be removed, and the engine block and cylinder head surfaces cleaned and resurfaced. New head bolts are installed and tightened according to a specific procedure, as they are designed to stretch and should not be reused. After reassembly, it is crucial to ensure that all components affected by overheating are replaced to restore engine functionality.