Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN L27/38 is a medium‑speed, four‑stroke diesel main engine delivering up to ~340 kW per cylinder (6‑ or 9‑cylinder versions) and designed for flexible fuel use (HFO, MDO/MGO). Its defining feature is the high‑efficiency MAN TCR constant‑pressure turbocharger combined with a robust 15.9:1 compression ratio.
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What our service work and the manufacturer documentation say about keeping this model running.
Maintain by OEM hour schedule with cylinder head, fuel pump and turbocharger inspections.
| Cylinder head overhaul | 8,000 - 12,000 hours |
|---|---|
| Fuel pump overhaul | 8,000 - 12,000 hours |
| Piston overhaul (rings, cleaning) | 16,000 - 24,000 hours |
| Turbocharger inspection | 4,000 - 8,000 hours |
| Turbocharger major overhaul | 16,000 - 24,000 hours |
| Main and crankpin bearing inspection | 24,000 - 32,000 hours |
| Major engine overhaul (bottom end, full engine) | 48,000 - 60,000 hours |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner wear (ovality/taper) | Max 0.6 - 0.8 mm (for 270mm bore) |
|---|---|
| Exhaust valve seat recession | Max 1.5 - 2.0 mm from new position |
| Piston ring groove wear (axial clearance) | Max 0.2 - 0.3 mm over new specification |
| Crankshaft deflection (between adjacent units) | Max 0.05 - 0.10 mm |
| Main/Crankpin bearing clearance increase | Max 0.1 - 0.2 mm over new specification |
| Turbocharger rotor axial/radial play | Refer to OEM manual, typically 0.1-0.2mm axial, 0.05-0.1mm radial |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors will typically focus on verifying adherence to planned maintenance schedules (PMS records, defect reports), functionality of safety devices (overspeed, low oil pressure, high temperature shutdowns), and recent crankshaft deflection readings. They will inspect the general condition of the engine, fuel system integrity (leakage, shielding of high-pressure lines), exhaust system insulation, and overall engine room cleanliness. If engine components have been opened for maintenance, they will review internal component condition reports and measurements (e.g., liner wear, bearing clearances). Compliance with NOx emission regulations (Tier II/III documentation) and fuel oil management procedures will also be checked.
Estimated lifetime: 50,000 - 80,000 hours before major overhaul/rebuild
Keep exhaust valves, injectors, fuel pump elements, piston rings, filters and gasket kits.
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