In the use of Plastigauge, what does a wider gauge indicate?

A wider gauge in the use of Plastigauge indicates a larger oil clearance between the crankshaft and main bearing. Plastigauge is a tool used in engine assembly to measure the clearance between two machined surfaces, such as the crankshaft and the main bearings. When the Plastigauge is compressed between these parts, it provides a reading that correlates to the amount of clearance present.

If the gauge is wider, it shows that there is more space between the crankshaft and the bearings, which translates to a larger oil clearance. This measurement is critical because proper oil clearance is essential for engine longevity and performance. Too wide of a clearance may result in insufficient oil pressure and increased wear on the engine components, while the opposite (too narrow) could lead to binding and potential engine failure.

In summary, using Plastigauge and interpreting a wider gauge reading correctly allows technicians to assess the health and proper assembly of engine components, ensuring optimal function and durability.