Main Engine 4-Stroke · Main Engines (4-Stroke)
The Cummins Marine 6LKTA19-M is a medium‑speed, turbocharged 6‑cylinder inline diesel engine delivering 540 kW at 1800 rpm, designed for main propulsion on small to midsize commercial vessels.
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| Engine Oil & Filters | 250 hours or annually (whichever comes first) |
|---|---|
| Fuel Filters (Primary & Secondary) | 250-500 hours or annually |
| Valve Lash Adjustment | Initial at 250 hours, then every 500-1000 hours |
| Coolant Filter | 500 hours or annually |
| Air Cleaner Element | Inspect every 250 hours, replace as needed (typically 500-1000 hours) |
| Raw Water Pump Impeller | Inspect annually, replace every 1000-2000 hours |
| Fuel Injectors (Inspect/Test) | 2000-4000 hours, overhaul/replace as needed |
| PT Fuel Pump Calibration/Overhaul | 4000-6000 hours or as required by performance |
| Vibration Damper Inspection | 2000-4000 hours |
| Heat Exchanger Cleaning | 2000-4000 hours, depending on water quality and operating conditions |
| Cylinder Liner Wear | Max taper/out-of-round typically 0.15 - 0.20 mm (check specific service manual for exact values). |
|---|---|
| Crankshaft Deflection | Max allowable deflection between adjacent main bearings typically 0.05 - 0.10 mm. |
| Piston Ring End Gap | Max service limit typically 1.0 - 1.5 mm (varies by ring type and position). |
| Main & Connecting Rod Bearing Clearances | Max service limit typically 0.15 - 0.20 mm. |
| Valve Stem to Guide Clearance | Max service limit typically 0.10 - 0.15 mm. |
| Turbocharger Shaft Play | Axial play typically 0.10 - 0.20 mm, Radial play typically 0.30 - 0.60 mm (refer to specific turbocharger model specifications). |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on: 1. Documentation Review: Verify engine logbook entries, maintenance records, fuel oil bunker delivery notes, and compliance with MARPOL Annex VI (NOx emissions certificate). 2. Operational Test: Witness engine start-up, operation at various loads (if possible), and shutdown. Check for abnormal noises, vibrations, exhaust smoke, and proper response to controls. 3. Safety Devices Functionality: Test overspeed trip, low oil pressure alarm/shutdown, high coolant temperature alarm/shutdown, and emergency stop buttons from all designated locations. 4. Fuel System Integrity: Inspect fuel lines, filters, pumps, and injectors for leaks, proper securing, and fire insulation. Verify quick-closing valves are operational and accessible. 5. Lubrication System: Check oil pressure, oil cooler integrity, and oil mist detector (if fitted) functionality. Verify oil sampling program is in place. 6. Cooling System: Inspect heat exchangers, pumps, piping, and expansion tank. Verify temperature control and alarm settings. 7. Exhaust System: Check for leaks, proper insulation, and condition of exhaust gas piping, expansion bellows, and silencer. Ensure spark arrestors are fitted if required. 8. Engine Mounts & Foundations: Inspect for signs of deterioration, cracks, or loose fastenings, ensuring engine is securely mounted. 9. Auxiliary Systems: Check starter motor, alternator, air compressor (if engine-driven), and associated piping/wiring for proper function and condition. 10. Engine Room Cleanliness & Fire Safety: Ensure good housekeeping, proper storage of flammables, and accessibility of fire fighting equipment (e.g., CO2 nozzles, fire dampers).
Estimated lifetime: 20,000 - 30,000 hours before major overhaul (top-end and bottom-end). Well-maintained units can often exceed 30,000 hours.
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