Main Engine 2-Stroke · Main Engines (2-Stroke)
The Wärtsilä 6RT-flex96C-D is a low‑speed, two‑stroke marine diesel engine delivering up to 34 320 kW at 102 rpm, distinguished by its common‑rail fuel injection and fully electronic control system.
| Exhaust valve overhaul | typically 8,000-16,000 hours depending on fuel and maker guidance - confirm against the Wartsila RT-flex maintenance schedule |
|---|---|
| Piston overhaul (ring renewal/liner inspection) | typically 12,000-24,000 hours |
| Fuel injection valve overhaul | typically 4,000-8,000 hours |
| Turbocharger overhaul | typically 12,000-16,000 hours or per condition monitoring |
| Crankshaft deflection reading | at every piston/bearing opening and per class survey requirement |
| Cylinder lubrication feed rate review | continuous monitoring, formal review monthly |
| Cylinder liner bore wear | renewal/re-boring typically considered once wear reaches a fraction of a percent of the 960 mm bore diameter - confirm the exact figure against the Wartsila RT-flex96C maintenance manual |
|---|---|
| Piston ring gap (running) | wear limit is typically a multiple of the as-new fitted gap - always check the specific figure in the maker's manual before condemning a ring |
| Crosshead guide shoe clearance | renewal is typically due once clearance is well beyond the as-new design clearance - confirm exact figure against maker's tables |
| Main/crankpin bearing clearance | condemning limit is typically a multiple of the as-new running clearance - use the maker's bearing clearance table for the exact figure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Main propulsion 2-stroke engines fall under Continuous Machinery Survey in most class societies, with crankshaft deflection readings, bearing clearances and piston/liner condition checked against an approved planned maintenance schedule; keep cylinder condition reports, deflection logs and lube oil analysis trends on hand, as surveyors commonly cross-check these against the engine running-hours log.
Estimated lifetime: This engine class is typically designed for 20-25+ years of service (well over 100,000-150,000 running hours) with scheduled overhauls of pistons, liners, bearings and valves at the intervals above; total life depends heavily on fuel quality, load profile and maintenance history
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