S70ME-C8.5
The Doosan S70ME-C8.5 is a low‑speed, two‑stroke main propulsion engine with a 700 mm bore and 3.256 m stroke, delivering about 8.5 MW at 91 rpm; its defining feature is the ME‑C electronically controlled fuel system (MAN licence).
Engine Specifications
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Common issues
- Excessive cylinder liner wear due to incorrect fuel injection timing
- Scavenge air leakage causing reduced engine efficiency and increased emissions
- Fuel pump malfunction resulting in poor engine performance and potential damage to fuel system components
- Crankpin bearing wear due to inadequate lubrication
- Turbocharger fouling or failure leading to reduced engine power output
- Exhaust valve leakage or damage causing overheating and reduced engine efficiency
- Low compression in cylinders due to worn or damaged piston rings or cylinder liners
Inspection checklist
- Cylinder head and valve condition
- Piston and ring condition
- Crankshaft and bearing condition
- Fuel injection system and pump condition
- Turbocharger condition and performance
- Scavenge air system and piping condition
- Lubrication system condition and oil quality
- Exhaust system condition and temperature monitoring
- Engine control and monitoring system functionality
Service intervals
| oil_change | 1000-1500 hours |
| fuel_filter_change | 500-1000 hours |
| air_filter_change | 1000-2000 hours |
| cylinder_liner_overhaul | 15000-20000 hours |
| piston_and_ring_overhaul | 20000-25000 hours |
Typical wear limits
| cylinder_liner | 0.5-1.0 mm wear limit |
| piston_ring | 0.5-1.5 mm wear limit |
| crankpin_bearing | 0.1-0.5 mm wear limit |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Cylinder liners
- Piston rings
- Crankpin bearings
- Fuel pump components
- Turbocharger components
- Exhaust valve spindles and seats
- Cylinder head gaskets
Safety
- Risk of explosion or fire due to fuel leakage or ignition source
- Risk of injury from moving parts or hot surfaces
- Risk of asphyxiation due to inadequate ventilation in engine room
- Risk of electrical shock from malfunctioning engine control systems
Class survey
Class surveyor typically checks for compliance with classification society rules and regulations, including verification of engine performance, emissions, and safety equipment
Components & Design
Component data being added…
Technical Data
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