Lycoming 74996 Crankshaft Idler Gear Assembly is a genuine engine timing component designed for use in compatible Lycoming aircraft piston engines. The idler gear assembly transfers rotational motion between the crankshaft and associated engine gears, ensuring accurate timing and dependable operation of the camshaft and accessory drive system.

As an integral part of the engine gear train, the crankshaft idler gear maintains proper gear engagement and synchronization throughout all phases of engine operation. Precision gear alignment is essential for maintaining correct valve timing, efficient power transmission, and reliable operation of engine-driven accessories.

Manufactured to Lycoming specifications, the 74996 assembly is engineered from high-strength aerospace-grade materials to withstand continuous cyclic loading, vibration, and the demanding operating environment within an aircraft engine. Precision machining and controlled gear geometry contribute to smooth operation, reduced wear, and extended service life.

The crankshaft idler gear assembly is commonly inspected during major engine overhaul or whenever the engine gear train is disassembled. Any indication of excessive wear, pitting, scoring, bearing deterioration, or gear tooth damage should be addressed by replacement to maintain proper engine timing and continued airworthiness.

Key Features

- Part Number: 74996
- Manufacturer: Lycoming Engines
- Component: Crankshaft Idler Gear Assembly
- Transfers rotational motion within the engine gear train
- Maintains accurate engine timing and accessory drive synchronization
- Precision-machined aerospace-grade gear assembly
- Designed to withstand continuous vibration, cyclic loads, and high operating temperatures
- Suitable for compatible Lycoming aircraft engines