What special procedure is necessary when adjusting valves of an engine with a floating cam ring?

When adjusting the valves of an engine equipped with a floating cam ring, it is essential to eliminate cam bearing clearance. This procedure is critical because the floating cam design allows for movement that can affect the valve timing and actuation if any clearance is present.

By eliminating the cam bearing clearance, the cam can float correctly within its designed parameters, ensuring that it maintains proper contact with the followers and that the timing remains consistent. The absence of clearance helps to prevent any unintended delays or slack in the cam's movement, which is crucial for the engine's performance and efficiency.

In contrast, leaving or increasing cam bearing clearance could lead to inaccuracies in valve timing and may cause insufficient actuation of the valves, leading to engine inefficiencies or potential mechanical failures. Adjusting the timing before clearing the bearings is not directly relevant to the task of ensuring that the cam operates properly within its tolerances, which highlights the importance of prioritizing the elimination of the cam bearing clearance for optimal function.