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Diesel Engine revision module 5 of 8

ELEC

Air, Exhaust, and Electrics

Air supply, exhaust restrictions, batteries, starter circuits, alternator charging, and warning lights.

air systemexhaust

4 guided lessons · 8 practice questions · 8 flashcards

3 outcomes · self-guided revision
  • Explain air supply, exhaust restrictions, batteries, starter circuits, alternator charging, and warning lights.
  • Apply air system to a realistic onboard situation.
  • Recall the core check: air intake must be clear.

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Lesson routeAir In, Exhaust Out0/1 read

Lesson 1 of 1

Air In, Exhaust Out

A diesel needs enough clean air in and a clear exhaust out. A blocked air intake, dirty filter, poor engine-room ventilation, collapsed hose, exhaust restriction, or waterlock problem can reduce power or create danger.

Air and exhaust faults can look like fuel or engine faults. The skipper should check the simple airflow path before assuming major mechanical failure.

  • Air intake must be clear.
  • Engine space needs ventilation.
  • Exhaust hose and waterlock should not be leaking or blocked.
  • Black smoke under load can indicate air shortage, overload, fouled propeller, or poor combustion.
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