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Gasket
Mack

A gasket provides a critical seal between mating surfaces to prevent leaks in engines, manifolds, and auxiliary assemblies. This non-metallic or composite sealing element is crushed slightly during assembly to fill microscopic irregularities and establish a tight barrier against oil, coolant, air, or gas leaks. In heavy-duty trucks, gaskets handle high temperature fluctuations, vibration, and relative motion between surfaces, making material choice and thickness important for dependable performance. Replacement ensures the integrity of the seal after service intervals, avoiding loss of lubrication or coolant pressure that could compromise engine efficiency or component life. Proper seating, surface cleanliness, and torque control are essential to maximize gasket life; uneven surface finishes or over-torquing can compromise the seal. Gaskets also serve to isolate fluids from one another, reducing cross-contamination and corrosion between adjacent systems. This part is a standard maintenance item that supports reliability and uptime in harsh conditions. Source One Parts Center — your source for truck parts.