MET-ER Series
Mitsubishi Heavy Industries MET-ER Series — Four-stroke diesel engines for marine and land-based generator applications.
Inspector Detail
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Common issues
- Compressor/turbine fouling from intake air contamination or exhaust deposits
- Bearing wear from lube oil quality issues or extended service
- Nozzle ring erosion from high-temperature exhaust gas over extended operation
- Sealing/labyrinth wear allowing oil migration into the gas path
- Rotor imbalance from uneven fouling or foreign object damage on the compressor side
Inspection checklist
- Visually inspect compressor and turbine blades for fouling, erosion, and damage
- Check bearing clearance at scheduled overhaul
- Verify water-washing effectiveness (compressor and, if fitted, turbine side)
- Monitor and trend vibration on the turbocharger casing
- Check oil supply pressure and cleanliness for lubricated cartridge types
- Inspect casing for oil leakage past seals into the gas path
Service intervals
| Compressor water-washing | typically every 100-250 running hours depending on fouling rate |
| Bearing/cartridge inspection | typically every 8,000-12,000 hours or per maker's schedule for this series |
| Full overhaul | typically every 12,000-20,000 hours - varies by frame size and fuel quality |
Typical wear limits
| Bearing clearance | this series covers engines from roughly 400 to 4,400 kW, so clearances vary significantly by frame size - always confirm the specific figure against the MHI service manual for the exact frame fitted |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Bearing cartridge/bushing set
- Nozzle ring
- Sealing air system components
- Balanced spare rotor assembly (recommended for larger frame sizes)
Safety
- High-speed rotor - risk of serious damage or injury from an uncontained failure if fouling or imbalance is ignored
- Hot turbine casing surfaces
- Water-washing system operates under pressure
Class survey
Turbocharger overhaul and washing records are typically reviewed as part of the driven engine's Continuous Machinery Survey; class expects evidence that the maker's recommended overhaul interval is being followed, or a condition-based justification for any extension.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Turbine blade and nozzle ring wear inspection - visually inspect for erosion and cracks due to exposure to high heat and exhaust gases
Compressor wheel and impeller condition - check for damage, corrosion, and proper alignment
Bearing assembly inspection - examine thrust and journal bearings for wear, discoloration, and play
Labyrinth seal integrity - verify seal gaps and condition to prevent oil leakage
Rotor balance and runout - measure shaft runout and verify smooth rotation without vibration
Oil drain line patency - ensure drain plugs and lines are clear of deposits and blockages
Casing inspection - visual check for cracks, corrosion, and proper gasket seating
Performance baseline testing - measure boost pressure and air flow capacity against baseline specifications
Type-general inspection and maintenance points for this equipment category — not model-specific.
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