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Wärtsilä

7RT-flex82C

Name: Wärtsilä 7RT-flex82C
Brand: Wärtsilä
SKU: OSE-38901

The Wärtsilä 7RT-flex82C is a medium‑speed, two‑stroke marine diesel engine delivering up to 24 780 kW at 84 rpm, notable for its common‑rail fuel injection and camshaft‑less design that provide high efficiency and flexible fuel use.

24780.0 kW

Power

Engine Specifications

Cylinders

820 mm

Bore

2646 mm

Stroke

24,780 kW

MCR Power

84.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: Wartsila RT-flex · Tier: IMO Tier II · Fuel: HFO, VLSFO, MDO

Inspector Detail

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Common issues

FIVA (Fuel Injection Valve Actuation) unit or servo-oil system faults affecting injection timing
Servo oil system contamination degrading electronically controlled fuel and exhaust valve actuation
Exhaust valve spindle guide wear or seizure
Scavenge air cooler fouling reducing charge air efficiency
Turbocharger fouling, erosion, or surge
Increased lube oil consumption from piston ring or cylinder liner wear
Cylinder liner bore polishing from an incorrect cylinder lubrication feed rate, and scavenge space fires from oil-soaked deposits

Inspection checklist

Crankcase inspection door checks and crankshaft deflection readings
Cylinder liner wear measured at defined heights with a bore gauge
Piston ring end gap check at overhaul
Exhaust valve rotation and spindle/seat condition checked, including borescope inspection where possible
Turbocharger blade fouling/erosion inspection
Scavenge space cleanliness check (oil accumulation / fire risk)
Fuel injection control unit alarm log and common-rail pressure trend reviewed
Main and crosshead bearing clearances checked at major overhaul (jack-up method)
HP fuel pipe/rail leak-off monitoring

Service intervals

Piston/cylinder liner overhaul	typically in the order of 12,000-24,000 running hours depending on fuel quality and cylinder lubrication feed rate - confirm against the engine's own maintenance manual
Exhaust valve overhaul	typically in the order of 8,000-16,000 running hours - confirm against the maker's schedule
Turbocharger overhaul (running gear)	typically in the order of 12,000-24,000 running hours, per the turbocharger maker's TBO - confirm against its own manual
Crankshaft deflection readings	at every scheduled survey and after any major work affecting alignment
Servo/fuel oil filter elements	per the maker's running-hour schedule, commonly renewed every few thousand hours - confirm against the manual

Typical wear limits

Cylinder liner wear	typically renewed in the order of 0.6-1.0% of bore diameter wear for large-bore two-stroke engines of this class - confirm against the maker's specific wear limit
Piston ring end gap	typically in the order of a few mm per metre of bore for large two-stroke rings - confirm against the maker's manual rather than a generic small-engine figure
Crankshaft deflection	typically expected within a few hundredths of a mm per metre of stroke, with the maker's/class allowable limit taking precedence - confirm against the vessel's specific engine data

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

Piston complete / piston ring set
Cylinder liner
Exhaust valve spindle and seat
Exhaust valve actuator (FIVA-type hydraulic valve unit)
Fuel injection valve
Cylinder lubricator quills
Turbocharger nozzle ring and rotor overhaul kit
Main/crosshead bearing shells

Safety

Crankcase explosion risk from hot spots (bearing wear, friction) igniting oil mist
Scavenge space fire risk from accumulated oil-soaked deposits
High-pressure common-rail fuel system stores significant energy - strict lockout procedure required before opening the system
Starting air system (receiver, non-return valves) - explosion/backfire risk if maintenance is deferred
Heavy fuel oil handling - burn and toxic fume hazards

Class survey

Continuous Survey Machinery (CSM) typically applies: crankshaft deflection records, cylinder condition (liner wear, piston ring) reports, and records of exhaust valve and turbocharger overhauls are presented at survey. Classification societies commonly accept condition-based/extended intervals where trend data (performance analysis, deflection readings, wear records) is properly maintained.

Estimated lifetime: Large two-stroke crosshead engines of this class are typically designed for continuous operation over 20-30+ years of vessel life, with major running-gear components (piston, liner, exhaust valve) subject to periodic overhaul rather than a single lifetime figure - confirm overhaul intervals against the maker's maintenance manual and actual running hours.