Main Engine 2-Stroke · Main Engines (2-Stroke)
The Doosan 5S70ME-C8.5 is a low‑speed, two‑stroke main propulsion engine with electronic ME‑C control, delivering high power density and flexible fuel capability.
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| Fuel Injection Valves (Inspection/Overhaul) | 3,000 - 6,000 running hours |
|---|---|
| Exhaust Valve Spindle & Seat (Overhaul/Grinding) | 6,000 - 12,000 running hours |
| Piston Overhaul (First Drop) | 12,000 - 18,000 running hours |
| Cylinder Liner Inspection/Measurement | 6,000 - 12,000 running hours |
| Turbocharger Minor Overhaul | 12,000 - 18,000 running hours |
| Turbocharger Major Overhaul | 36,000 - 48,000 running hours |
| HPS Filters (Renewal) | 500 - 1,000 running hours (or as per differential pressure) |
| Main/Crosshead Bearings (Inspection/Renewal) | 48,000 - 60,000 running hours or 5-year survey |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder Liner | Max wear 0.6-0.8% of bore diameter (e.g., 4.2-5.6mm for 700mm bore). Max ovality 0.5-0.8mm. |
|---|---|
| Piston Ring Groove | Axial clearance max 0.25-0.40mm (depending on ring position). |
| Exhaust Valve Seat | Max wear/pitting depth before reconditioning or replacement (e.g., 1-2mm). |
| Main Bearings | White metal thickness minimum 1.5-2.0mm. Max clearance 0.25-0.40mm. |
| Crosshead Bearings | White metal thickness minimum 1.0-1.5mm. Max clearance 0.15-0.30mm. |
| Turbocharger Bearings | Axial play 0.10-0.20mm, Radial play 0.15-0.25mm (refer to specific TC manual). |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically check engine logbooks, maintenance records, lube oil/fuel oil analysis reports, and performance data. Operational tests include engine start/stop, emergency stop, and overspeed trip (if due). Visual inspection covers general condition, leakages, securing of components, and exhaust gas system. Crankcase inspection (opening doors) for main/crosshead bearings and oil mist detector function. Scavenge space inspection for cleanliness and drain condition. Often, one or two cylinder units are opened for visual inspection of cylinder liner, piston crown, and exhaust valve condition, with liner wear measurements potentially requested. Fuel oil system integrity, control & monitoring systems (including HPS unit), and associated auxiliary systems are also verified.
Estimated lifetime: 100,000 - 150,000 running hours before major overhaul (e.g., crankshaft inspection, main bearing renewal, significant component replacement). With continuous proper maintenance, engines can exceed 200,000 hours.
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