A technician is performing a valve seat runout test using a dial indicator. What is the maximum acceptable runout on most medium/heavy duty diesel engines?

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Multiple choice — select the best answer

A0.002 inch (0.051 mm)
B0.010 inch (0.254 mm)
C0.005 inch (0.127 mm)
D0.020 inch (0.508 mm)

✓ Correct answer: A. 0.002 inch (0.051 mm) Maximum acceptable valve seat runout on most medium/heavy duty diesel engines is typically 0.002 inch (0.051 mm). Excessive runout prevents proper valve sealing, leading to compression loss and possible valve burning.

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A technician is performing a valve seat runout test using a dial indicator. What is the maximum acceptable runout on most medium/heavy duty diesel engines?

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