The 641742 is an engine accessory drive gear used in Continental aircraft piston engines. It is part of the internal gear train that transmits mechanical power between crankshaft-driven components and engine accessory systems.

Key features include:

OEM Continental precision drive gear
High-strength hardened steel construction
Used in engine accessory / lubrication or timing drive systems (application depends on engine model)
Designed for continuous operation under high RPM and oil exposure
Precision-cut gear teeth for synchronized mechanical transfer
Installed in certified Continental engine assemblies (IO/TSIO series variants)
Engineered for high fatigue resistance and long service life
This gear is a critical rotating engine component, typically found in the accessory case or internal drive system where it supports reliable operation of engine-driven systems such as pumps or timing-related assemblies.