Lycoming 17F21186 Rocker Assembly is a precision-engineered valve train component designed for use in compatible Lycoming aircraft piston engines. This rocker assembly replaces the previous 67113 part number and provides the mechanical connection required to transfer valve train motion from the pushrod assembly to the engine valves.

The rocker assembly pivots on the rocker shaft and converts linear movement from the pushrod into controlled valve actuation. Proper rocker operation is essential for maintaining accurate valve timing, consistent valve lift, and reliable intake and exhaust valve performance throughout the engine operating cycle.

Manufactured to Lycoming specifications, the 17F21186 rocker assembly is designed to withstand repeated mechanical loading, vibration, lubrication conditions, and elevated temperatures present within aircraft piston engines. Precision-machined contact surfaces help ensure smooth movement and minimize wear within the valve train system.

The rocker assembly should be inspected during cylinder maintenance and engine overhaul procedures for wear, excessive clearance, damaged contact surfaces, or abnormal movement. Replacement of worn components helps restore proper valve train geometry and supports reliable engine performance.

Key Features

- Part Number: 17F21186
- Manufacturer: Lycoming Engines
- Component: Rocker Assembly
- Replacement For: 67113
- Transfers motion between the pushrod and engine valve
- Supports accurate valve timing and valve operation
- Precision-manufactured for proper fit and smooth movement
- Designed to withstand vibration, lubrication, and cyclic engine loads
- Suitable for compatible Lycoming aircraft engines