“Main engine maintenance” refers to the regular upkeep and repair activities performed on the primary propulsion engine of a ship or yacht to ensure its smooth operation. This process is undertaken to maximize the engine’s performance, prevent malfunctions, and extend its lifespan. Main engine maintenance typically includes the following tasks:

  1. Visual Inspections:

    • Examine the overall condition of the engine.
    • Look for signs of leaks, wear, or damage.

  2. Oil and Filter Changes:

    • Regularly replace the engine oil.
    • Renew oil, air, and fuel filters.

  3. Cooling System Maintenance:

    • Check the coolant level and condition.
    • Clean and replace cooling system components as needed.

  4. Fuel System Checks:

    • Inspect and clean fuel lines, pump, and injectors.
    • Check the condition of the fuel tank.

  5. Electrical and Electronic System Checks:

    • Inspect battery conditions and connections.
    • Examine electrical wiring and connections.

  6. Air System Checks:

    • Clean and replace air filters and intake systems as necessary.

  7. Exhaust System Checks:

    • Inspect the exhaust system and components.
    • Perform exhaust smoke analysis if needed.

  8. Cooling and Lubrication Systems:

    • Check the engine’s cooling and lubrication systems.
    • Inspect pumps and connections.

  9. Record Keeping:

    • Document all maintenance and repairs in detail.
    • Create a plan for future maintenance.

Main engine maintenance should be carried out at regular intervals to ensure the engine operates efficiently and to prevent breakdowns. These tasks are typically performed according to the periods specified in the engine’s user manual.