Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A diesel engine is experiencing power loss and smoking blue-grey from the exhaust. Which system is most likely faulty?
Blue-grey smoke typically indicates burning oil. Damaged turbocharger oil seals allow engine oil to leak into either the intake or exhaust side, leading to both
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Question: A diesel engine is experiencing power loss and smoking blue-grey from the exhaust. Which system is most likely faulty?
Answer options:
- Air intake system restriction
- Fuel pressure regulator ✅ Turbocharger oil seals
- Exhaust gas recirculation (EGR) valve
Correct answer: Turbocharger oil seals
Explanation: Blue-grey smoke typically indicates burning oil. Damaged turbocharger oil seals allow engine oil to leak into either the intake or exhaust side, leading to both burning oil and potential power loss.
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