What happens when the valve lash is too tight?

When the valve lash is too tight, it can lead to a condition known as valve chatter. Valve lash refers to the gap between the top of the valve stem and the rocker arm. If this gap is insufficient, it may prevent the valves from fully closing, which can result in a number of issues.

Valve chatter is characterized by a tapping or clicking noise produced when the engine operates, often indicating that the valves are not functioning properly. This can cause increased wear on the valve train components, leading to reduced engine performance over time. Proper valve clearance is essential for optimal engine operation, as it allows valves to open and close at the correct times, ensuring efficient combustion and power generation.

In contrast, if the valve lash is set correctly, the engine can run more smoothly, maintain better fuel efficiency, and produce its intended power output. Tight valve lash creates more stress on components, which can exacerbate issues with engine longevity and performance.