HEAD GASKETS
Head gaskets are one of the most critical sealing components in an internal combustion engine. They sit between the engine block and the cylinder head, sealing the combustion chambers, coolant passages, and oil passages to ensure efficient engine operation.
🔧 Functions of a Head Gasket
Seals the combustion chamber
Maintains compression for engine power
Separates oil and coolant
Prevents internal leaks between fluids
Withstands extreme conditions
Must endure high pressure and temperatures (up to 2,500–3,000 psi combustion pressure and 400–500°F)
🧱 Types of Head Gaskets
Multi-Layer Steel (MLS) – Most common in modern engines
Multiple thin layers of steel with a coating
Durable and heat-resistant
Composite (Fiber) – Older vehicles
Made from graphite or asbestos-substitute materials
Less durable than MLS
Copper
Very durable and used in performance/racing engines
Requires precise machining or O-ringing for proper seal
Elastomeric
Uses rubber inserts around critical sealing areas
Less common, found in some OEM designs