Caterpillar 4N9654 Exhaust Coupling Assembly

The 4N9654 exhaust coupling connects exhaust piping to the turbocharger or manifold outlet on Caterpillar 3300 series industrial diesel engines. Designed to accommodate thermal expansion and vibration while maintaining a gas-tight seal under continuous high-temperature exhaust flow. Constructed from high-silicon ductile iron or cast steel for resistance to thermal cycling and corrosion. The flanged joint pattern matches OEM specifications for direct bolt-on installation without modification. Compatible with Caterpillar 3304, 3306, D330C, D333C, 3304B, and 3306B engine configurations used in stationary generator sets, industrial power units, and heavy machinery.