Main Engine 4-Stroke · Main Engines (4-Stroke)
Regular maintenance is crucial to ensure the long-term reliability of any marine engine, and the Mitsubishi S6R2-MPTA is no exception. This six-cylinder diesel engine, designed for high-speed operation, can run on both diesel and marine gas oil (MGO). While it's known for its robust construction, common issues can arise including injector fouling, turbocharger fouling, cooling water leakage, and heat exchanger fouling. To minimize downtime and keep the engine running smoothly, it's essential to adhere to Mitsubishi's recommended service intervals. This includes regular oil and filter changes, injector maintenance, valve clearance adjustments, and thorough cooling system checks. Keeping a stock of essential spare parts such as filter kits, injectors, belts, water pump components, thermostats, and gaskets can further expedite repairs and minimize disruption to your operations.
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What our service work and the manufacturer documentation say about keeping this model running.
Maintain oil, filters, injectors, valve clearance and cooling system according to Mitsubishi service intervals.
| Engine oil and filter change | 250-500 hours or annually (whichever comes first, based on oil analysis and duty cycle) |
|---|---|
| Fuel filter replacement (primary and secondary) | 250-500 hours |
| Valve clearance check and adjustment | 1000-2000 hours |
| Injector inspection, cleaning, or overhaul | 2000-4000 hours |
| Cooling system flush and inspection (including heat exchangers) | 2000-4000 hours |
| Turbocharger inspection and cleaning | 2000-4000 hours |
| Raw water pump impeller replacement | 500-1000 hours or annually |
| Major overhaul (top end) | 8000-12000 hours (condition-based) |
| Major overhaul (bottom end) | 12000-18000 hours (condition-based) |
| Crankshaft deflection | Max. 0.02-0.05 mm (check specific Mitsubishi manual for exact values) |
|---|---|
| Piston ring gap (top ring) | Max. 1.0-1.5 mm (service limit) |
| Valve stem clearance | Max. 0.15-0.25 mm (service limit) |
| Turbocharger rotor axial play | Max. 0.15-0.25 mm (service limit) |
| Turbocharger rotor radial play | Max. 0.4-0.6 mm (service limit) |
| Main bearing clearance | Max. 0.15-0.20 mm (service limit) |
| Connecting rod bearing clearance | Max. 0.12-0.18 mm (service limit) |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on the overall integrity and safe operation of the engine and its ancillary systems. Key checks include: verification of engine room cleanliness and fire safety arrangements (e.g., proper insulation, fire dampers, fuel shut-off valves); integrity of fuel and lube oil systems (no leaks, proper filtration, alarm functions); cooling system performance (temperatures, pressures, alarms, raw water strainers); exhaust system integrity (insulation, leaks, expansion joints); functionality of all engine controls and safety devices (overspeed trip, low oil pressure alarm, high water temperature alarm, emergency stops); condition of engine mounts and vibration dampeners; and review of engine logbooks, service records, and oil analysis reports to confirm maintenance compliance and engine health. They will also check for valid calibration certificates for critical gauges and sensors.
Estimated lifetime: 10,000 - 15,000 hours before major overhaul, with proper maintenance and condition monitoring. Can extend to 20,000+ hours with excellent care and duty cycle.
Keep filter kits, injectors, belts, water pump parts, thermostats and gaskets.
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