What is a method to inspect the dimensions of a bearing in a rocker arm?

Inspecting the dimensions of a bearing in a rocker arm requires precision and accuracy, particularly because these components must fit perfectly to ensure proper operation. Using a telescopic gauge coupled with a micrometer is a widely accepted method for measuring inner dimensions accurately.

A telescopic gauge can be inserted into the bore of the bearing. Once in place, the gauge can be expanded to make contact with the inner walls. This tool is specifically designed to capture the internal diameter. After setting the telescopic gauge, its measurements can be transferred to a micrometer, which provides a precise reading of the diameter. The combination of these two tools allows for a highly accurate measurement of internal dimensions, which is critical for ensuring that the bearing fits within the rocker arm without excessive play or interference.

Other methods such as using a digital caliper might be suitable for external measurements but may not provide the same level of precision required for internal dimensions. Depth gauges and protractors serve different purposes related to depth measurement and angle measurement, respectively, making them unsuitable choices for measuring the dimensions of a bearing.