Answer :
Both Technician A and Technician B can be correct, as both methods are commonly used to check crankshaft endplay or end clearance.
Technician A uses a feeler gauge to measure the gap between the end of the crankshaft and the thrust surface of the engine block. This method involves inserting a calibrated feeler gauge between the two surfaces and measuring the thickness of the gauge required to fill the gap. This measurement gives an accurate indication of the amount of endplay or end clearance present.Technician B uses a dial indicator to measure the movement of the crankshaft as it is pushed back and forth in its axial direction. The indicator is mounted to the engine block or some other fixed point, and the measuring tip is placed against the end of the crankshaft.
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