Checking valve lash or valve clearance is an essential maintenance procedure for internal combustion engines that use valves to control the flow of gases into and out of the combustion chamber. Valve lash refers to the precise gap between the valve stem and the rocker arm or camshaft lobe that actuates it. The correct valve lash is crucial for ensuring optimal engine performance, fuel efficiency, and longevity, and it should be checked periodically as per the manufacturer’s recommendations.
Incorrect valve lash can lead to a range of problems, including poor engine performance, reduced power and fuel economy, excessive noise and vibrations, valve damage, and even catastrophic engine failure. Checking and adjusting valve lash is a relatively simple procedure that can be performed using basic tools and a feeler gauge. It involves measuring the gap between the valve stem and the rocker arm or camshaft lobe when the valve is closed and comparing it to the manufacturer’s specifications. If the gap is too large or too small, it can be adjusted by turning the adjusting screw or nut on the rocker arm or camshaft.
