The ROTAX 881920 is a certified OEM O-ring set used for sealing the valve cover (rocker cover) assemblies on Rotax 912 and 914 series aircraft engines. It is part of the engine’s lubrication sealing system and ensures proper oil containment at the cylinder head valve cover interface.

The set is designed as a complete maintenance replacement kit for valve cover sealing during inspection, overhaul, or routine service of the top-end engine components. It is specified in Rotax service documentation as the standard sealing set for valve cover removal and reinstallation procedures.

According to Rotax service instructions, the 881920 kit is used on a per-engine basis and consists of multiple O-rings that seal the rocker cover assembly to prevent oil leakage under temperature and pressure cycling conditions typical of air-cooled aircraft piston engines.

Key features include:

OEM Rotax-certified sealing kit for valve cover assemblies
Designed for Rotax 912 / 914 engine families
Includes multiple O-rings for full rocker cover sealing
Resistant to aviation oils, heat, and vibration loads
Maintains crankcase ventilation and oil system integrity
Required during valve cover removal/maintenance procedures
Engine-specific fitment to ensure proper compression sealing
Supplied through Rotax authorized distribution network
Intended for certified and experimental aircraft maintenance use
Used in conjunction with Rotax Illustrated Parts Catalog (IPC) procedures