Turbocharger · Turbochargers
Marine turbochargers are essential components in optimizing the performance and efficiency of large maritime engines. Mitsubishi’s MET-MBII model is specifically designed for large two-stroke marine main engines, featuring an axial turbine type to enhance exhaust gas and charge air management. This robust turbocharger is part of the MET-MB family, known for its reliability and durability in demanding maritime applications. Common failures that can affect the MET-MBII include turbine nozzle fouling, compressor fouling, bearing wear from contaminated lubricating oil, and rotor vibration caused by uneven deposits. To ensure optimal performance and longevity, it is crucial to maintain OEM service kits and model-specific components such as nozzles and rotors. The exact MET frame and execution are required for these parts to fit and function correctly. Servicing the MET-MBII should be conducted according to the manufacturer's manual and in compliance with classification society requirements. An annual inspection during class survey is recommended to identify and address any issues promptly. It is also advisable to stock spare parts as specified by Mitsubishi to minimize downtime and ensure quick repairs when needed. By adhering to these maintenance guidelines, operators can maximize the efficiency and reliability of their marine engines.
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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.
| Water washing (compressor/turbine) | Daily to Weekly, depending on engine load and fuel quality |
|---|---|
| Visual inspection (external, air filter) | Every 250-500 running hours |
| Compressor/Turbine side inspection (via ports) | Every 2,000-4,000 running hours |
| Bearing inspection and replacement | Every 8,000-12,000 running hours |
| Major overhaul (bearings, seals, rotor balance check) | Every 16,000-24,000 running hours |
| Full overhaul/Replacement of critical components (e.g., rotor shaft, casings NDT) | Every 48,000-60,000 running hours |
| Class Survey Inspection | Annually |
| Rotor axial clearance | New: 0.15-0.35 mm. Max allowable: New + 0.1 mm (e.g., 0.45 mm) |
|---|---|
| Rotor radial clearance (at bearings) | New: 0.20-0.40 mm. Max allowable: New + 0.15 mm (e.g., 0.55 mm) |
| Bearing shell wear | Max 0.1 mm reduction in thickness or visible scoring/pitting/cracks |
| Blade tip clearance | Visual inspection for rubbing marks; no direct measurement limit typically given for in-situ checks. |
| Nozzle ring deformation | Max 0.5 mm distortion or cracks affecting gas flow |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
For annual survey, the surveyor typically checks operational parameters, external condition, reviews logbook entries for maintenance and abnormal events, and witnesses the overspeed trip test. For intermediate/special surveys, internal inspection of the compressor and turbine sides, bearing inspection, NDT (Non-Destructive Testing) of critical components (e.g., rotor shaft, casing welds), measurement of clearances, and verification of spare parts inventory are usually required. All maintenance records and manufacturer's service schedules must be available and up-to-date.
Estimated lifetime: 80,000 - 100,000 hours (for main casing and rotor shaft, with regular component overhauls and replacements)
Maintain OEM service kit and model-specific nozzle/rotor components; exact MET frame and execution are required.
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