Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During the intake stroke of a 4-stroke diesel engine, which valve(s) are open?
During the intake stroke of a 4-stroke diesel engine, the intake valve is open, allowing fresh air to be drawn into the cylinder as the piston moves downwards f
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Question: During the intake stroke of a 4-stroke diesel engine, which valve(s) are open?
Answer options:
- Exhaust valve only ✅ Intake valve only
- Both intake and exhaust valves
- Neither valve
Correct answer: Intake valve only
Explanation: During the intake stroke of a 4-stroke diesel engine, the intake valve is open, allowing fresh air to be drawn into the cylinder as the piston moves downwards from TDC to BDC, while the exhaust valve remains closed.
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