Main Engine 2-Stroke · Main Engines (2-Stroke)
The Hyundai 6S90ME-C10.5 is a low‑speed, 2‑stroke marine diesel main engine with electronic ME‑C control, delivering high thermal efficiency and fuel flexibility for large commercial vessels.
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| Fuel Injectors Overhaul/Replacement | 6,000 - 8,000 running hours |
|---|---|
| Exhaust Valve Spindle Overhaul/Replacement | 8,000 - 12,000 running hours |
| Cylinder Liner Wear Measurement | 6,000 - 12,000 running hours |
| Piston Overhaul (withdrawal & ring replacement) | 12,000 - 18,000 running hours (initial), then 18,000 - 24,000 hours |
| Turbocharger Overhaul (minor/major) | Minor: 8,000-16,000 hours, Major: 24,000-36,000 hours |
| Crosshead Bearing Inspection | 12,000 - 18,000 running hours |
| Main Bearing Inspection | 24,000 - 36,000 running hours |
| Cylinder Liner Bore Increase | Max 0.6% - 0.8% of original bore (e.g., 5.4mm - 7.2mm for 900mm bore) |
|---|---|
| Piston Ring Groove Wear | Max 0.2mm - 0.3mm increase in axial clearance |
| Exhaust Valve Spindle Seat Wear | Max 1.0mm - 1.5mm reduction in seat width or depth |
| Crosshead Bearing Clearance | Max 0.2mm - 0.3mm increase from new clearance |
| Crankshaft Deflection | Max 0.05mm - 0.10mm (depending on cylinder position and engine size) |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Surveyors will focus on the functionality of safety devices and alarms (overspeed, low lube oil pressure, high cooling water temp, OMD). Crankshaft deflection measurement is often required annually or biennially. Scavenge space and crankcase inspections are critical for signs of fires or abnormal wear. Fuel oil system integrity, especially high-pressure lines and lagging, is checked for fire safety. Review of logbooks, planned maintenance records, oil analysis reports, and performance data is standard. HPU condition and proper operation of the electronic control system are key for ME-C engines.
Estimated lifetime: 24,000 - 36,000 running hours before major overhaul (e.g., all piston withdrawals, main bearing inspection). Engine structure designed for 20-25 years service life with continuous maintenance.
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