Gaskets and Seals

Common symptoms include white smoke from exhaust, coolant in the oil (milky appearance), engine overheating, loss of coolant without visible leaks, and compression loss between cylinders. A blown head gasket requires immediate professional repair.

Multi-layer steel (MLS) gaskets are standard for modern engines. Composite gaskets work well for older engines with less surface finish. Copper gaskets are used in high-performance applications. Always use the gasket type specified by the manufacturer.

Clean the mating surfaces thoroughly, apply RTV sealant at specified locations (corners and timing cover joints), install the gasket in the valve cover groove, and torque bolts in the proper sequence to manufacturer specifications.

Modern gaskets often require no additional sealant, but specific applications may need RTV at critical points. Follow manufacturer instructions. Using excessive sealant can clog oil passages and cause engine damage.

Common causes include thermal cycling (expansion and contraction), warped manifold surfaces, improper torque, and corrosion. Symptoms include ticking noises that worsen when cold and exhaust smell in the engine bay.