O.S. Engine OS23818140 Thermo Insulator for O.S. 21B 40E 70C engines  [OS23818140]

Thermo insulator for O.S. engines

This O.S. Engine OS23818140 thermo insulator is an RC-scale accessory designed to sit with compatible model engines 21B, 40E and 70C to help manage heat transfer at the engine head area. It is intended to reduce direct heat conduction between mating surfaces and support more consistent head temperature under running and tuning conditions.

Compatibility is limited to the model codes shown in the product name, check your engine stamping before fitting. Installation is straightforward in most glow engine head assemblies, using the engine's existing mounting hardware; ensure the mating faces are clean and flat and verify clearance with surrounding components after assembly.

In tuning use it as a thermal buffer to reduce temperature swings when testing different needles and props, and monitor head temperature as part of routine setup and maintenance. This is an RC-scale part and is not intended for any full-size engine application.