STX-MAN 6L27/38 GenSet
The STX‑MAN 6L27/38 is a medium‑speed, six‑cylinder inline diesel genset delivering direct 60 Hz power at 720 rpm, licensed from MAN’s L27/38 family and used as shipboard auxiliary power.
Engine Specifications
Inspector Detail
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Common issues
- Exhaust valve wear (burning, seat recession, stem wear)
- Fuel pump element wear (plunger and barrel scoring, reduced delivery pressure)
- Turbocharger fouling (compressor/turbine side, leading to reduced efficiency and surging)
- Piston ring wear or breakage (leading to increased blow-by, oil consumption, and reduced compression)
- Main and crankpin bearing wear (due to lubrication issues, misalignment, or overloading)
- Fuel injector nozzle choking or wear (poor atomization, increased fuel consumption, cylinder imbalance)
- Cooling water leaks (internal or external, leading to overheating or contamination)
- Governor malfunction (unstable RPM, load fluctuations, black smoke)
Inspection checklist
- Review engine logbook for operational parameters (temperatures, pressures, RPM, load, fuel consumption trends).
- Analyze recent lube oil and fuel oil analysis reports for wear metals, TBN, viscosity, water content, and fuel quality.
- Perform indicator diagram analysis (if equipment available) to check combustion balance, peak pressures, and injection timing.
- Visually inspect exhaust system for leaks, discoloration, and turbocharger condition (bearing play, compressor/turbine blade fouling).
- Check fuel system for leaks, proper filter condition, fuel pump timing, and high-pressure pipe integrity.
- Inspect cylinder heads for leaks (fuel, water), valve rotator function, and general cleanliness.
- Listen for abnormal engine noise, vibration, or observe unusual exhaust smoke.
- Verify proper function of safety devices (overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown, emergency stops).
- Inspect cooling water system for leaks, proper pressure, and heat exchanger cleanliness.
- Check crankcase for abnormal blow-by and ensure oil mist detector is operational and free from alarms.
Service intervals
| Exhaust Valve Overhaul | 6,000 - 8,000 hours |
| Fuel Injector Overhaul | 3,000 - 4,000 hours |
| Fuel Pump Overhaul | 6,000 - 8,000 hours |
| Cylinder Unit (Piston/Liner) Overhaul | 12,000 - 16,000 hours |
| Turbocharger Overhaul | 12,000 - 16,000 hours |
| Main/Crankpin Bearing Inspection | 16,000 - 24,000 hours |
| Major Overhaul (Crankshaft out) | 80,000 - 100,000 hours |
Typical wear limits
| Cylinder Liner Wear | Max 0.6 - 0.8 mm ovality or taper (measured at top ring TDC position). |
| Exhaust Valve Seat Recession | Max 0.8 - 1.2 mm from new position (check manufacturer's specific limit). |
| Crankshaft Deflection | Max 0.05 - 0.08 mm (depending on engine length, measured at each web). |
| Main/Crankpin Bearing Clearance | Max 0.15 - 0.20 mm over new clearance. |
| Piston Ring Groove Wear | Max 0.15 mm increase in axial clearance. |
| Turbocharger Rotor Axial Play | Max 0.20 - 0.25 mm (check manufacturer's specific limit). |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Exhaust valve spindle and seat ring (one set per cylinder)
- Fuel pump element (plunger and barrel) (one set)
- Fuel injector nozzle (one set per cylinder)
- Piston rings (complete set for one cylinder)
- Main and crankpin bearing shells (one set of each)
- Turbocharger bearing cartridge / repair kit
- Various gaskets and O-rings (cylinder head, fuel pump, exhaust manifold)
- Fuel, lube oil, and air filters (complete sets)
Safety
- High-pressure fuel injection system leaks (risk of fire, spray injury, or diesel run-away).
- Hot surfaces (exhaust manifold, turbocharger, exhaust piping) causing severe burns.
- Rotating machinery (flywheel, coupling, shaft) entanglement risk.
- Crankcase explosion potential (though rare with modern OMDs, still a concern if oil mist accumulates).
- Pressurized cooling water system leaks (scalding risk from hot water/steam).
Class survey
A class surveyor will typically check the following: 1. **Documentation Review**: Verification of Planned Maintenance System (PMS) records, engine logbook entries, oil analysis reports, and valid certificates. 2. **Operational Test**: Engine run-up at various loads to observe stability, check critical parameters (temperatures, pressures, RPM, load sharing), and exhaust gas appearance. 3. **Safety Device Functionality**: Testing of overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown, and emergency stop buttons. 4. **Visual Inspection**: Thorough check for fuel, lube oil, and cooling water leaks; abnormal vibrations; general cleanliness; and proper securing of components. 5. **Crankshaft Deflection**: Readings are often required at specific intervals (e.g., 8,000-16,000 hours or annually/biennially) to monitor bearing and foundation integrity. 6. **Bearing Inspection**: If due per PMS or condition monitoring, main and crankpin bearings may be opened for visual inspection and clearance checks. 7. **Fuel Injection System**: Examination of high-pressure fuel lines, fuel pumps, and injectors for leaks or signs of distress. 8. **Exhaust Gas System**: Inspection of exhaust manifold, turbocharger (external condition, bearing play if accessible), and exhaust piping for integrity. 9. **Engine Room Environment**: Assessment of ventilation, fire fighting arrangements, and overall compliance with safety regulations.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Service & Maintenance
Use oil analysis and regular indicator checks where available. Carry out STX/MAN scheduled maintenance for cylinder units, fuel equipment and bearings.
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