When measuring a cylinder head for flatness with a straightedge and feeler gauge, what is the maximum allowable warpage on most medium/heavy duty diesel engines?

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Multiple choice — select the best answer

A0.001 inch (0.025 mm)
B0.005 inch (0.127 mm)
C0.003 inch (0.076 mm)
D0.010 inch (0.254 mm)

✓ Correct answer: C. 0.003 inch (0.076 mm) Most medium/heavy duty diesel engine manufacturers specify a maximum cylinder head warpage of 0.003 inch (0.076 mm) across the length of the head. Exceeding this specification requires either machining or replacement of the head.

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When measuring a cylinder head for flatness with a straightedge and feeler gauge, what is the maximum allowable warpage on most medium/heavy duty diesel engines?

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