14631-PNA-000 Rocker Shaft - Overview. The 14631-PNA-000 Rocker Shaft is an essential component within Honda marine engine systems. This part operates as a crucial part of the valve train system, enabling the precise movement required to open and close engine valves efficiently. By supporting valve operation, it helps maintain reliable engine performance and longevity. Designed for seamless integration with existing hardware, it ensures optimal performance and durability within your Honda engine