Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty diesel engine is operating. During the exhaust stroke, which of the following events correctly describes the position of the engine valves and the piston's movement?
During the exhaust stroke of a four-stroke diesel engine, the piston travels from Bottom Dead Center (BDC) to Top Dead Center (TDC) to push out the spent combus
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Question: A heavy-duty diesel engine is operating. During the exhaust stroke, which of the following events correctly describes the position of the engine valves and the piston's movement?
Answer options: ✅ Exhaust valve open, intake valve closed, piston moves from BDC to TDC.
- Both valves closed, piston moves from TDC to BDC.
- Intake valve open, exhaust valve closed, piston moves from BDC to TDC.
- Both valves open, piston moves from TDC to BDC.
Correct answer: Exhaust valve open, intake valve closed, piston moves from BDC to TDC.
Explanation: During the exhaust stroke of a four-stroke diesel engine, the piston travels from Bottom Dead Center (BDC) to Top Dead Center (TDC) to push out the spent combustion gases, while the exhaust valve is open and the intake valve remains closed.
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