A technician is checking valve-to-piston clearance during an engine rebuild. What is the minimum acceptable clearance for most medium/heavy duty diesel engines?

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Multiple choice — select the best answer

A0.020 inch (0.5 mm)
B0.100 inch (2.5 mm)
C0.040 inch (1.0 mm)
D0.060 inch (1.5 mm)

✓ Correct answer: D. 0.060 inch (1.5 mm) Most medium/heavy duty diesel engines require a minimum valve-to-piston clearance of 0.060 inch (1.5 mm) for intake valves and slightly more for exhaust valves to prevent contact during operation, which could cause severe engine damage.

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A technician is checking valve-to-piston clearance during an engine rebuild. What is the minimum acceptable clearance for most medium/heavy duty diesel engines?

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