This product is specifically designed for the BYD472QA 1.5L Xiaoyun plug-in hybrid专用engine in the BYD Qin PLUS DM-i. It is a critical sealing component installed between the valve cover and the cylinder head—the valve cover gasket. The valve cover gasket acts as the engine's "sealing guardian," responsible for sealing the gap between the valve cover and cylinder head, preventing high-temperature, high-pressure engine oil from leaking from the top of the engine, while also preventing external dust and debris from entering the engine interior, protecting precision components such as valve rocker arms and camshafts from contamination and wear. It is a core sealing component for ensuring proper engine operation.

The Xiaoyun 1.5L naturally aspirated engine in the BYD Qin PLUS DM-i features Atkinson cycle operation with an ultra-high compression ratio of 15.5:1 and a maximum thermal efficiency exceeding 43%. The engine displacement is 1498ml, with a maximum power of 81kW and a maximum torque of 135N·m. The engine features an aluminum alloy cylinder block and aluminum alloy cylinder head with a DOHC dual overhead camshaft valve train and 4 valves per cylinder, placing extremely high demands on the precision and reliability of sealing components.

This product is developed and manufactured strictly according to BYD OEM technical standards, using high-quality ACM acrylic rubber material, precision-molded through vulcanization, offering excellent high-temperature resistance, oil resistance, and aging resistance. The product passes rigorous -30°C to 150°C high-low temperature cycle tests and 240-hour oil immersion tests, providing direct replacement for aged or damaged original valve cover gaskets to restore proper engine top sealing system operation.