Turbocharger · Turbochargers
Regular servicing and adherence to the manufacturer's guidelines are crucial for maintaining the reliability and performance of large marine diesel engine auxiliary equipment. Mitsubishi's MET-SE is designed to handle exhaust gas and charge air in both 2-stroke and 4-stroke large marine diesel engines. This axial turbine is part of the MET-SE family and is known for its robust construction. However, common issues such as turbine blade erosion, compressor fouling, bearing distress due to lube-oil contamination, and rotor imbalance from deposits can affect its performance. To address these issues, it is recommended to stock spare parts such as bearing sets, seal kits, nozzle rings, and washing equipment consumables. Servicing should follow the manufacturer's manual and classification society requirements, with an annual inspection during the class survey to ensure optimal operation.
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What our service work and the manufacturer documentation say about keeping this model running.
Servicing per the manufacturer's manual and classification society requirements. Annual inspection at class survey. Stock spare parts as specified by the manufacturer.
| Minor Inspection (visual, cleaning) | 4,000 - 8,000 running hours |
|---|---|
| Bearing Inspection/Replacement | 8,000 - 16,000 running hours (depending on bearing type and engine duty) |
| Rotor Overhaul (removal, cleaning, balancing, bearing replacement) | 16,000 - 24,000 running hours |
| Major Overhaul (complete disassembly, inspection, replacement of worn parts, balancing) | 32,000 - 48,000 running hours |
| Annual Class Survey Inspection | Annually |
| Turbine Blade Tip Clearance | Max allowable increase 0.2-0.5 mm from new (new typically 0.5-1.5 mm cold). Any visible cracks require replacement. |
|---|---|
| Compressor Blade Tip Clearance | Max allowable increase 0.2-0.4 mm from new (new typically 0.4-1.2 mm cold). Any significant damage or erosion requires replacement. |
| Journal Bearing Radial Clearance | Max allowable increase 0.05-0.1 mm from new (new typically 0.1-0.3 mm). |
| Thrust Bearing Axial Clearance | Max allowable increase 0.03-0.05 mm from new (new typically 0.1-0.2 mm). |
| Rotor Run-out | Max allowable radial run-out at shaft ends typically 0.02-0.05 mm. |
| Casing Cracks | Any visible crack in pressure-retaining or structural parts requires immediate attention, repair, or replacement as per manufacturer guidelines. |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically verify the last major overhaul/inspection dates and review associated records. They conduct an external visual inspection for leaks (exhaust gas, oil), cracks, and general condition of insulation. Operational parameters (boost pressure, RPM, bearing temperatures, exhaust gas temperatures) are checked against normal values. Confirmation of proper functioning of safety devices (e.g., overspeed trip, if tested during survey) is crucial. The condition of the air filter and exhaust gas silencer/spark arrestor is also inspected. Surveyors will look for excessive vibration or unusual noises during operation and may review lube oil analysis reports. Finally, they confirm that critical spare parts inventory is maintained as per manufacturer and class requirements.
Estimated lifetime: 80,000 - 120,000 hours for the main rotor assembly with regular maintenance and overhauls. Casing and static components can last the lifetime of the engine if properly maintained.
Common planned spares include bearing set, seal kit, nozzle ring and washing equipment consumables.
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