What are feeler gauges primarily used to measure?

Feeler gauges are primarily used to measure small spaces between surfaces. These tools consist of a number of thin metal blades or strips, each of a precise thickness, which allow for accurate measurements of gaps, clearances, and tolerances in mechanical setups. In engine technology, for instance, these measurements could be critical when adjusting valve clearances, ensuring that the components fit together properly without excessive friction or interference.

The design of feeler gauges enables technicians to efficiently check gaps in tight spaces where other measuring tools cannot reach, making them indispensable for ensuring that mechanical assemblies operate smoothly and reliably. The ability to select the appropriate thickness from a set of feeler gauges is essential in achieving precise adjustments in various small engine applications.