Engineering · Diesel — Air Systems
'Blowby' in a diesel engine refers to:
- ACombustion gases leaking past the piston rings into the crankcase✓ Correct
- BAir escaping from the scavenge ports
- CExhaust gas recirculating to the intake
- DStarting air leaking past the air start valve
Explanation
Worn or stuck rings let high-pressure combustion gas blow past the piston into the crankcase, pressurizing it, contaminating the oil, and reducing power.
Authority: Diesel Engines (USCG engineering topic)
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