Heavy Duty Equipment Technician Red Seal Exam Prep · Question
In a diesel engine, what does the term 'blow-by' refer to?
Blow-by occurs when combustion gases escape past the piston rings and down into the crankcase. Excessive blow-by is an indicator of worn piston rings, cylinder
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Question: In a diesel engine, what does the term 'blow-by' refer to?
Answer options:
- Exhaust gases escaping past the turbocharger seals ✅ Combustion gases leaking past the piston rings into the crankcase
- Unburnt fuel vapors exiting the exhaust system
- Oil leaking past the valve stem seals into the combustion chamber
Correct answer: Combustion gases leaking past the piston rings into the crankcase
Explanation: Blow-by occurs when combustion gases escape past the piston rings and down into the crankcase. Excessive blow-by is an indicator of worn piston rings, cylinder liners, or pistons, leading to reduced engine efficiency and increased oil consumption.
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