A diesel engine is experiencing a loss of power. During inspection, the technician discovers valve recession on multiple valves. What is the most likely cause?

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Multiple choice — select the best answer

AExcessive cylinder head torque
BToo much valve stem protrusion
CImproper camshaft timing
DIncorrect valve lash adjustment

✓ Correct answer: D. Incorrect valve lash adjustment Valve recession occurs when valve seats wear excessively, allowing valves to recede deeper into the cylinder head. This is typically caused by lack of lubrication or incorrect valve lash adjustment that prevents proper rotation of the valves during operation.

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A diesel engine is experiencing a loss of power. During inspection, the technician discovers valve recession on multiple valves. What is the most likely cause?

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