What is the appropriate method for measuring cam lobe and camshaft journals?

Using an outside micrometer for both cam lobe and camshaft journal measurements is the most accurate method due to the precision that micrometers offer. Micrometers are designed to measure small dimensions accurately, typically within one-thousandth of an inch. This precision is essential for engine components to ensure proper fit and function.

When measuring the cam lobes, it is crucial to determine their height and profile accurately, as this affects valve timing and engine performance. The outer surface of the cam lobe can be measured effectively with a micrometer, ensuring that any wear or deviation from specifications is identified.

Similarly, measuring the camshaft journals, where the camshaft rides within the engine block, also requires precision to ensure that they fit properly in their bearings. Any wear or damage here can lead to engine failure or reduced performance, making precise measurements necessary for maintenance or rebuilding.

Other measurement tools, such as calipers or rulers, do not offer the level of accuracy required for these specific applications. Feeler gauges are intended for measuring gaps rather than dimensions and therefore would not be appropriate for measuring cam lobe heights or journal diameters. Thus, using an outside micrometer for both cam lobes and journals ensures reliable and precise measurements critical in engine operation and