Heavy Duty Equipment Technician Red Seal Exam Prep · Question
Which of the following describes the power (combustion) stroke in a 4-stroke diesel engine?
During the power stroke of a 4-stroke diesel engine, ignited fuel expands and pushes the piston downwards from Top Dead Center (TDC) to Bottom Dead Center (BDC)
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Question: Which of the following describes the power (combustion) stroke in a 4-stroke diesel engine?
Answer options:
- Both valves closed, piston moves from BDC to TDC.
- Intake valve open, exhaust valve closed, piston moves from TDC to BDC. ✅ Both valves closed, piston moves from TDC to BDC.
- Exhaust valve open, intake valve closed, piston moves from BDC to TDC.
Correct answer: Both valves closed, piston moves from TDC to BDC.
Explanation: During the power stroke of a 4-stroke diesel engine, ignited fuel expands and pushes the piston downwards from Top Dead Center (TDC) to Bottom Dead Center (BDC), with both the intake and exhaust valves remaining closed to contain the high-pressure gases.
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