Which tool is required to measure cam lobe wear when the camshaft is located within the engine block?

To measure cam lobe wear in a camshaft that is located within the engine block, using a dial indicator is essential. This tool provides a precise and accurate measurement of the cam lobe height and allows for the detection of wear compared to the original specifications. The dial indicator operates by measuring the movement of the cam lobe as it rotates and contacts a fixed point, showing any deviations in height which indicates wear.

While other tools, such as a straight edge or protrusion gauge, may be useful in certain measurements, they do not offer the same level of precision as a dial indicator when assessing the intricacies of cam lobe wear. A feeler blade is generally used to measure gaps or clearances and wouldn’t effectively provide the necessary information about lobe wear. Thus, the dial indicator stands out as the ideal tool for this specific application in engine diagnostics.