O.S. Engine OS22406001 21F Engine Piston Pin Replacement  [OS22406001]

Engine wrist pin replacement overview

This O.S. Engine OS22406001 piston pin is offered as a service replacement to support RC engine rebuilds and maintenance operations. It suits 21F-series engines and provides the rotating interface between piston and connecting rod during operation.

The description emphasises correct fit and workshop practice over spec tables. When rebuilding, ensure the piston pin slides without binding in the piston small end and seats correctly in the wrist pin bore before final torqueing. Apply proper engine service procedures and suitable tools to prevent surface damage or misalignment at installation.

Installation notes:

• Thoroughly clean mating faces and eliminate debris prior to fitting.
• Ensure a smooth, light sliding fit in the piston and small end; any excessive clearance or tightness indicates a poor match.
• Observe the engine manufacturer's recommended assembly sequence and torque settings for associated fasteners.