Technician A says to apply oil to the connecting rod bearings while taking measurements with Plastigage. Technician B says that Plastigage will more accurately measure oil clearances than micrometers. Who is correct?

Question

Quizplus · Accepted Answer

Plastigage is used to measure the clearance between bearings and journals without oil, as oil can affect the accuracy of the measurement. Micrometers are used to measure the actual dimensions of parts and, with the proper technique, can accurately measure oil clearances when combined with the measurement of the corresponding journal or bearing.

Technician a Says to Apply Oil to the Connecting Rod