What must be done if the camshaft is worn beyond specifications?

When a camshaft is worn beyond specifications, it can significantly impact the engine's performance and functionality. In this situation, replacing the camshaft is a necessary step, as a worn camshaft will not provide the required lift and timing needed for the engine's valves to operate efficiently. This can lead to poor engine performance, increased emissions, and potential engine damage.

Additionally, it's essential to consider the lifters when the camshaft is replaced. Lifters, which follow the camshaft's contour, can also wear down over time. If the camshaft is significantly worn, the lifters may have become impacted as well. Replacing both the camshaft and the lifters ensures that all components of the valvetrain interact properly and helps to prevent future issues stemming from mismatched wear.

Therefore, addressing both the camshaft and lifters is vital for maintaining optimal engine performance and longevity.