Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During the compression stroke of a 4-stroke diesel engine, which of the following is true?
In a 4-stroke diesel engine's compression stroke, both the intake and exhaust valves are closed to seal the cylinder, allowing the piston to travel from BDC to
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Question: During the compression stroke of a 4-stroke diesel engine, which of the following is true?
Answer options:
- Both intake and exhaust valves are open, and the piston moves from BDC to TDC. ✅ Both intake and exhaust valves are closed, and the piston moves from BDC to TDC.
- The intake valve is open, the exhaust valve is closed, and the piston moves from TDC to BDC.
- The exhaust valve is open, the intake valve is closed, and the piston moves from TDC to BDC.
Correct answer: Both intake and exhaust valves are closed, and the piston moves from BDC to TDC.
Explanation: In a 4-stroke diesel engine's compression stroke, both the intake and exhaust valves are closed to seal the cylinder, allowing the piston to travel from BDC to TDC, compressing the air for combustion.
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