Main Engine 2-Stroke · Main Engines (2-Stroke)
The Wärtsilä 12RT-flex96C-D is a low‑speed, two‑stroke marine diesel engine delivering up to 68 640 kW at 102 rpm, notable for its common‑rail fuel injection and camshaft‑less design.
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| Fuel injection valve overhaul | typically 8,000-12,000 h or per condition monitoring - confirm against Wärtsilä's RT-flex maintenance manual |
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| Cylinder liner/piston major overhaul | typically in the order of 12,000-24,000 h depending on fuel quality and load profile |
| Turbocharger major overhaul | typically 12,000-16,000 h, with interim cleaning at shorter intervals |
| Crosshead/main bearing inspection | per Continuous Survey Machinery schedule or approved condition-based monitoring |
| Scavenge air cooler cleaning | typically every 4,000-8,000 h or per differential pressure trend |
| Common-rail system filter/pump inspection | per maker's planned maintenance schedule |
| Cylinder liner wear | assessed against the maker's bore-gauging renewal criteria for this bore class rather than a fixed figure - confirm against Wärtsilä's current limit book for the RT-flex96C |
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| Piston ring gap and crosshead bearing clearance | use the engine's own instruction manual tolerance tables; these vary by build series and are not safe to generalise for an engine of this size |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Large low-speed engines of this type are normally enrolled in Continuous Survey Machinery (CSM) or an approved condition-based maintenance scheme; class expects running-hours logs, overhaul records for crosshead/main bearings and turbochargers, and evidence that crankcase explosion relief and oil mist detection are tested and functional at each survey.
Estimated lifetime: Design service life for the engine frame/crankcase is typically in the order of 25+ years of vessel service with continuous component-level overhauls; individual wearing parts (liners, rings, bearings, injection equipment) are replaced on running-hours and condition-based schedules rather than the engine having a single lifetime figure.
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