Heavy Duty Equipment Technician Red Seal Exam Prep · Question
In a diesel engine, what is the 'pre-ignition' or 'glow' period primarily for?
Glow plugs heat the air within the combustion chamber or pre-chamber, making it easier for diesel fuel to ignite when injected, particularly in cold ambient con
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Question: In a diesel engine, what is the 'pre-ignition' or 'glow' period primarily for?
Answer options:
- To atomize fuel before injection ✅ To heat the combustion chamber to aid cold starting
- To reduce engine emissions
- To lubricate the fuel injectors
Correct answer: To heat the combustion chamber to aid cold starting
Explanation: Glow plugs heat the air within the combustion chamber or pre-chamber, making it easier for diesel fuel to ignite when injected, particularly in cold ambient conditions.
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