Main Engine 2-Stroke · Main Engines (2-Stroke)
The Hudong‑Zhonghua 7G95ME-C10.5 is a 7‑cylinder inline low‑speed two‑stroke main engine with MAN‑licensed ME‑C electronic control, delivering roughly 73 MW at 58 rpm.
Every value below comes from the manufacturer datasheet or class-society record on file for this model.
Other models of the same equipment type, Hudong-Zhonghua first.
| Cylinder unit overhaul (piston, liner, exhaust valve) | 12,000 - 16,000 running hours (depending on condition and fuel type) |
|---|---|
| Exhaust valve overhaul | 8,000 - 12,000 running hours (depending on condition and fuel type) |
| Fuel injector overhaul/replacement | 3,000 - 6,000 running hours (depending on fuel quality and operation) |
| Turbocharger minor overhaul (bearings, cleaning) | 12,000 - 24,000 running hours |
| Turbocharger major overhaul | 36,000 - 48,000 running hours |
| Crosshead bearing inspection | 24,000 - 36,000 running hours (or as per condition monitoring) |
| HPS unit filter replacement | 1,000 - 2,000 running hours |
| Safety system function test | Annually or every 2,000 running hours |
| Cylinder liner wear (max diameter increase) | 0.6% - 0.8% of bore diameter (e.g., 5.7mm - 7.6mm for 950mm bore) |
|---|---|
| Piston ring groove wear (axial clearance increase) | Max 0.2 - 0.3 mm beyond new specification |
| Exhaust valve seat recession | Max 1.0 - 2.0 mm (from new position) |
| Crankshaft deflection (max relative deviation) | 0.05 - 0.10 mm (depending on engine size and manufacturer guidelines) |
| Crosshead bearing clearance (max increase) | 0.5 - 0.8 mm (beyond new specification) |
| Turbocharger rotor axial play | 0.1 - 0.3 mm (manufacturer specific) |
| Turbocharger rotor radial play | 0.05 - 0.15 mm (manufacturer specific) |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically focus on verifying the engine's structural integrity, safety systems, and compliance with classification rules. Key checks include: review of engine logbooks and maintenance records (including lube oil analysis and fuel reports); functional testing of overspeed trip and emergency stop devices; crankshaft deflection measurements; inspection of scavenge spaces for cleanliness and fire prevention; opening of selected cylinder units (piston, liner, exhaust valve) for condition assessment based on running hours and previous survey findings; verification of fuel oil system integrity (high-pressure pipe shielding, leak detection); and general visual inspection for leaks, abnormal vibrations, and proper functioning of auxiliary systems. Emphasis is placed on the electronic control system's reliability and alarm management.
Estimated lifetime: 150,000 - 200,000 running hours (before requiring major factory-level overhaul or replacement of major structural components, with proper maintenance and component renewal)
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