O.S. Engine OS23106000 Piston Pin 35AX replacement piston pin for 35AX nitro RC engines  [OS23106000]

Piston pin for 35AX engines

This piston pin is an RC-scale replacement part intended for use in O.S. Engine 35AX-class engines and equivalent 35AX-design assemblies. It serves as the rotating joint between piston and connecting rod, and is sold as a single pcs spare for routine maintenance and repair of nitro model engines.

Installation is straightforward for hobby workshop workbench use: remove the piston assembly, inspect the pin bore and piston for scoring, slide the pin into the piston and align with the connecting rod, and secure any circlips or retainers provided on the engine. Apply a light assembly oil on contact surfaces before final fit to reduce initial wear, and check axial clearance after installation.

In tuning and service cycles the piston pin is a wear item that affects seal and rotational smoothness. Replace the pin if there is visible scoring, ovality, or excessive endplay, and inspect the piston ring and connecting rod bearing at the same time to ensure consistent engine behaviour.