Main Engine 2-Stroke · Main Engines (2-Stroke)
The Doosan 5S70ME-C10.5-GI is a low‑speed, inline 5‑cylinder, dual‑fuel (LNG/HFO) main engine featuring MAN‑licensed gas‑injection technology for high thermal efficiency and IMO Tier III emissions compliance.
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| Cylinder Unit Overhaul (Piston, Liner, Exhaust Valve) | 8,000 - 16,000 hours (condition-based, depending on fuel usage and wear rates) |
|---|---|
| Gas Admission Valve (GAV) Overhaul | 4,000 - 8,000 hours |
| Pilot Fuel Injector (PFI) Overhaul | 4,000 - 8,000 hours |
| Exhaust Valve Overhaul | 8,000 - 12,000 hours (or condition-based) |
| High-Pressure Fuel Gas Pump/Compressor Overhaul | 4,000 - 8,000 hours (depending on type and design) |
| Turbocharger Minor Overhaul (Bearings) | 12,000 - 18,000 hours |
| Turbocharger Major Overhaul (Rotor, Casing) | 36,000 - 48,000 hours |
| Main Bearing / Thrust Bearing Inspection | 16,000 - 24,000 hours |
| Cylinder Liner Wear (Max. Ovality/Taper) | 0.6 - 0.8 mm from new (or manufacturer specific limits) |
|---|---|
| Piston Ring Axial Clearance (Max. Increase) | 0.2 - 0.3 mm beyond new specification |
| Exhaust Valve Spindle Seat Recess | 1.0 - 1.5 mm into the seat ring |
| Main Bearing Clearance (Max.) | 0.25 - 0.35 mm (measured with lead wire/plastigauge) |
| Connecting Rod Bearing Clearance (Max.) | 0.20 - 0.30 mm |
| Turbocharger Bearing Play (Axial/Radial) | Refer to manufacturer's specific limits, 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 rigorously inspect the Fuel Gas Supply System (FGSS) for compliance with IGF Code, including double-wall piping integrity, gas detection, ventilation, ESD (Emergency Shut Down) systems, and inerting arrangements. Functionality tests of all engine safety devices (overspeed, low lube oil pressure, high cooling water temp, engine trips) and the fuel changeover system are critical. They will review planned maintenance system (PMS) records, defect reports, and overhaul reports for critical components like cylinder units, exhaust valves, and turbochargers. Scavenge space and under piston space cleanliness will be checked. Specific attention will be paid to the condition and operational parameters of ME-GI specific components such as Gas Valve Units (GVU) and high-pressure gas pumps/compressors. Overall engine cleanliness, absence of leaks, and general operational readiness are also key.
Estimated lifetime: 100,000 - 150,000 hours before major overhaul (e.g., crankshaft inspection, main bearing renewal), with regular component replacement.
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