Internal Combustion Engines
If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the

Exhaust will be smoky
Piston rings would stick into piston grooves
Engine starts overheating
Scavenging occurs

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Internal Combustion Engines
Scavenging air in diesel engine means

Air used for combustion sent under pressure
Burnt air containing products of combustion
Forced air for cooling cylinder
Air used for forcing burnt gases out of engine's cylinder during the exhaust period

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