While disassembling a cylinder head, a technician notices several rocker arms have excessive wear at the valve contact point. What is the most likely cause?

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Multiple choice — select the best answer

AImproper valve rotation
BExcessive valve spring pressure
CIncorrect rocker arm material
DInsufficient lubrication

✓ Correct answer: D. Insufficient lubrication Insufficient lubrication is typically the cause of excessive wear at rocker arm valve contact points. This can be due to clogged oil passages, low oil pressure, or extended oil change intervals that degraded the oil's lubricating properties.

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While disassembling a cylinder head, a technician notices several rocker arms have excessive wear at the valve contact point. What is the most likely cause?

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