MaK M 43 C

Common issues

• Exhaust valve seat wear and burning, especially with HFO operation and poor fuel quality.
• Fuel injector leakage or poor spray patterns leading to incomplete combustion and thermal stress.
• Turbocharger fouling (compressor and turbine sides) reducing efficiency and increasing exhaust back pressure.
• Bearing damage (main and connecting rod) due to contaminated lube oil, insufficient oil film, or misalignment.
• Piston ring wear, breakage, or sticking, leading to increased lube oil consumption and blow-by.
• Fuel pump element wear or sticking, affecting fuel delivery timing and quantity.
• Cooling water system blockages or leaks, leading to localized overheating or corrosion.

Inspection checklist

• Monitor exhaust gas temperatures per cylinder for deviations (indicative of combustion issues, valve condition, or injector problems).
• Check cylinder indicator diagrams (if available) or perform compression tests to assess cylinder condition (liner wear, valve sealing).
• Inspect fuel injection system for leaks, proper atomization (if visible), and fuel pump rack synchronization.
• Visually inspect turbocharger for oil leaks, abnormal noises, and check boost pressure and exhaust gas temperatures before/after TC.
• Perform regular lube oil analysis (spectroscopy, viscosity, TBN, water content) to monitor bearing health and oil contamination.
• Check crankcase for abnormal noises, excessive blow-by, and ensure oil mist detector is functional.
• Inspect cooling water system for leaks, proper pressure, and signs of corrosion or scaling in heat exchangers.
• Examine engine mounting for signs of movement, loose bolts, or excessive vibration during operation.
• Verify proper operation of all safety devices: overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown.

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Complete exhaust valve units (or spindles/seats/rotators)
• Fuel injectors (complete units or nozzles)
• Piston rings (complete set for at least one cylinder)
• Main and connecting rod bearing shells (one set each)
• Fuel pump elements and delivery valves
• Turbocharger bearing cartridge or complete rotor assembly
• Various gaskets, O-rings, and seals for common maintenance tasks
• Starting air valve and safety valve spares

Safety

• High-pressure fuel lines: Risk of spray fires from leaks, especially with HFO.
• Hot surfaces: Exhaust manifold, turbocharger, and cylinder heads pose severe burn risks.
• Crankcase explosion: Ensure oil mist detector is operational and crankcase relief valves are clear.
• Rotating machinery: Guarding must be in place for flywheel, turning gear, and turbocharger.
• Heavy lifting: Components like cylinder heads, pistons, and turbochargers are heavy and require proper lifting gear and procedures.
• Confined spaces: Entry into crankcase or exhaust gas casings requires permit-to-work and gas freeing procedures.

Class survey

Class surveyors will typically require crankshaft deflection readings, opening of at least one main bearing and one connecting rod bearing for inspection, and measurement of cylinder liner wear. They will verify the functionality of all engine safety devices (overspeed, low LO pressure, high CW temp, oil mist detector). Fuel system integrity, fire prevention arrangements, and exhaust gas system condition are also key. Review of engine maintenance records, lube oil analysis reports, and performance logs is mandatory to assess overall engine health and compliance with planned maintenance systems.