The cover plate in the M40 engine serves as the rear closure of the crankcase, sealing the engine’s internal oil and fuel mixture. Made by an injection molding process using nylon, this component is designed to securely attach to the crankcase, ensuring an airtight seal to prevent any leakage of the fuel and oil blend within the engine. The injection-molded nylon construction provides excellent strength and resilience, allowing the cover plate to withstand the dynamic conditions of engine operation. With its robust design and precise fit, the cover plate contributes to the engine’s overall integrity and efficiency, maintaining the necessary pressure for smooth combustion. Its ability to effectively seal the crankcase makes the cover plate a vital part of the model airplane engine, ensuring reliable and efficient performance throughout various flying conditions.