O.S. Engine OS22406001 Piston Pin for 21F Engines  [OS22406001]

Replacement piston pin for model engines

This O.S. Engine OS22406001 piston pin is supplied as a direct replacement component for use in RC-scale model engine rebuilds and routine maintenance. The part is intended for 21F-series applications and performs the critical connection between piston and connecting rod in the engine assembly.

The text highlights fit and service guidance rather than detailed dimensions. When rebuilding, confirm the piston pin slides freely in the piston small end and seats squarely in the wrist pin bore before completing assembly. Use standard engine service practice and the correct tools to prevent scoring or misalignment during installation.

Installation notes:

• Clean mating surfaces and remove all debris before fitting.
• Verify a smooth, light sliding fit in the piston and small end; excessive play or tightness indicates a mismatch.
• Follow the engine manufacturer's recommended assembly sequence and torque values for any related fasteners.