The 640746 is an aircraft engine gear component, typically referenced in Continental engine documentation as a “Gear Assembly – SCAC / scavenge pump related gear” (SOH variant designation) used in the accessory section of piston aircraft engines.

It is part of the engine accessory drive / lubrication system gear train, where it helps transmit mechanical rotation to components such as oil scavenge or pump systems depending on engine configuration.

Key features include:

OEM Continental engine accessory gear
Commonly associated with scavenge / oil pump drive systems (SOH designation)
Precision-machined steel construction for high-RPM engine environments
Designed for continuous lubrication system operation
High fatigue and wear resistance under engine thermal cycles
Used in certified piston aircraft engines (Continental engine families)
Critical part of engine lubrication and accessory drive reliability