Main Engine 2-Stroke · Main Engines (2-Stroke)
The Wärtsilä 7RT‑flex96C is a low‑speed, two‑stroke marine diesel engine delivering up to 40 040 kW at 102 rpm, distinguished by its common‑rail fuel injection and camshaft‑less design for high torque and flexible fuel use.
| Cylinder lubrication feed rate | continuously adjusted per running condition and fuel sulphur, per Wartsila feed-rate guidance |
|---|---|
| Lube oil analysis | every 500-1000 hours for system oil, plus ongoing cylinder oil monitoring |
| Piston overhaul (inspection/ring renewal) | typically every 12,000-24,000 hours, condition-based - confirm against Wartsila maintenance schedule |
| Exhaust valve overhaul | typically every 8,000-16,000 hours, condition-based |
| Turbocharger overhaul | typically every 12,000-24,000 hours per manufacturer's interval |
| Fuel injector inspection/service | every 4,000-8,000 hours or per condition |
| Crankshaft deflection check | every 2,000-4,000 hours or per class requirement |
| Cylinder liner wear | bauart-typical renewal around 0.6-1.0% of bore diameter for this engine class - confirm the exact limit against the Wartsila 7RT-flex96C instruction manual |
|---|---|
| Piston ring gap | varies by ring position and running hours - confirm against the Wartsila manual rather than assuming a generic figure |
| Exhaust valve seat recession/burning | condition-based rejection per Wartsila inspection criteria, not a fixed millimetre figure |
| Crankshaft deflection | acceptable range is engine- and class-specific - always use the class-approved deflection limit for this engine, not a generic value |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Main propulsion engines of this size are typically enrolled in a Continuous Machinery Survey (or equivalent) scheme - class reviews crankshaft deflection records, cylinder/piston overhaul history, turbocharger overhaul records and crankcase oil mist detection function; camshaft-less common-rail engines like the RT-flex also require records of hydraulic/servo system maintenance and control system diagnostics.
Estimated lifetime: Major structural components (bedplate, frame, crankshaft) are typically designed for 20+ years/100,000+ running hours with scheduled overhauls; wearing parts (liners, rings, injectors, turbocharger components) are renewed on the shorter condition-based cycles noted above - confirm against Wartsila's maintenance planner for this engine
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