Failing to check and adjust valve clearances regularly on a car or motorcycle engine can have several consequences, including:
Engine Performance: Incorrect valve clearances can affect the engine's performance. If the clearance is too small (valve not closing fully), it can lead to decreased power output, reduced fuel efficiency, and compromised combustion. On the other hand, if the clearance is too large (valve not opening fully), it can cause reduced airflow, resulting in poor engine performance and a loss of power.
Valve Train Noise: Improper valve clearances can result in increased valve train noise. If the clearances are too tight, the valves may not fully close, causing a ticking or tapping sound. This noise can be not only irritating but also an indication of potential valve train problems.
Valve and Seat Damage: Over time, without proper clearance adjustments, the valves may not seat properly against the valve seats. This can lead to increased wear and damage to both the valves and the valve seats. In extreme cases, it can cause valve burning or valve recession, requiring expensive repairs or even complete engine failure.
Engine Overheating: Incorrect valve clearances can impact the engine's cooling system. If the valves don't fully close, hot gases can escape into the combustion chamber during the compression stroke, increasing the temperature inside the engine. This can contribute to overheating issues and potential damage to the engine's components.
Reduced Valve Train Lifespan: The valve train components, including the valves, valve seats, camshafts, and lifters, are designed to operate within specific tolerances. Failure to maintain proper valve clearances can accelerate wear on these components, leading to premature failure and requiring costly repairs or replacements.
It's important to note that the frequency of valve clearance checks and adjustments varies depending on the specific engine and manufacturer's recommendations. Regular maintenance, including valve clearance inspections, can help ensure optimal engine performance, extend the lifespan of engine components, and prevent costly repairs in the long run.