O.S. Engine OS29067120 Pump Unit Fixing Screw CSM3X18  [OS29067120]

Pump fastener overview

This is an RC-scale pump unit fixing screw produced under the O.S. Engine part number OS29067120, identified by the CSM3X18 designation. It is intended to secure pump assemblies on O.S. Engine pump units and related RC engine pump hardware, serving as a direct replacement or spare fastener for routine maintenance.

Installation guidance is focused on preserving thread integrity and alignment: start the screw straight into the mating hole, ensure components sit flush, and tighten progressively to avoid cross-threading. Avoid overtightening to prevent damage to pump housings or threads, and inspect the screw periodically for wear or thread deformation.

In tuning and upkeep, this fixing screw helps maintain consistent pump alignment and seal seating so pump performance remains stable between runs. Carrying a spare screw can reduce downtime during track-side maintenance or workshop servicing.