How to Use a Feeler Gauge Correctly for Perfect Clearance
Discover why a feeler gauge is essential for checking engine and machine clearances. Easy explanation of uses, types, and selection tips.. What Is a Feeler Gauge? A feeler gauge is a thin measuring tool made of small metal blades. Each blade has a specific thickness. These blades are usually made of hardened steel or stainless steel and are marked with their thickness value in millimeters (mm) or inches. When you want to measure the gap between two parts, you insert the blade into the space. If the blade fits smoothly without force, that thickness is equal to the gap size. If it does not fit, you try a thinner blade. This simple method gives very accurate measurement of clearances. This tool is mainly used in automotive engines, industrial machines, pumps, compressors, and precision mechanical assemblies. Why Accurate Gap Measurement Is Important In machines, many parts move very close to each other. For example: Engine valve and rocker arm Spark plug electrode gap Bearing clea...