Main Engine 4-Stroke · Main Engines (4-Stroke)
The Wärtsilä 26 series is a medium‑speed, four‑stroke diesel main engine known for its high power per cylinder (≈325 kW) and flexible fuel capability (HFO, MDO, GO). Its defining feature is the modular cylinder configuration (6L to 16V) combined with a turbocharger‑intercooler system delivering low specific fuel consumption.
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What our service work and the manufacturer documentation say about keeping this model running.
Routine service includes injector overhaul, valve clearance checks, crankcase inspections and turbocharger cleaning by OEM schedule.
| Injector overhaul | 3000-6000 running hours |
|---|---|
| Valve clearance check | 3000-6000 running hours |
| Crankcase inspection | 3000-6000 running hours |
| Turbocharger water wash cleaning | 500-1000 running hours (more frequent on HFO) |
| Turbocharger dry/chemical cleaning or overhaul | 6000-12000 running hours |
| Piston and cylinder head overhaul | 12000-18000 running hours |
| Main and crankpin bearing inspection/renewal | 24000-36000 running hours (or as per condition monitoring) |
| Cylinder Liner | Max wear diameter 0.6-0.8 mm from new (measured at top ring reversal point) |
|---|---|
| Piston Ring Groove | Max side clearance 0.25-0.35 mm (for top ring) |
| Crankshaft Deflection | Max deviation 0.05-0.10 mm (depending on engine length and OEM guidelines) |
| Main/Crankpin Bearing Clearance | Max increase 0.15-0.20 mm from new (or as per OEM manual) |
| Exhaust Valve Seat Recession | Max 1.5-2.0 mm (before renewal of seat ring or spindle) |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
During periodical surveys, a class surveyor will typically check: - Verification of planned maintenance system (PMS) records and completed maintenance tasks. - Review of lube oil analysis reports and trends. - Witnessing or review of crankshaft deflection readings. - Inspection of main bearing clearances (often by jacking test, or opening if required by schedule/condition). - Testing of engine safety devices (overspeed trip, low lube oil pressure, high cooling water temperature, oil mist detector). - Integrity of fuel oil system, including piping, filters, alarms, and quick-closing valves. - Condition of engine foundation bolts and mounting arrangements. - General cleanliness of the engine and engine room, absence of leaks (fuel, lube oil, water). - Condition of exhaust gas system insulation and integrity. - Verification of critical spare parts inventory.
Estimated lifetime: 80,000 - 120,000 hours (for major components like block and crankshaft, with proper maintenance and overhauls)
Maintain injector nozzles, exhaust valves, piston rings, filters, gasket sets and bearing shells.
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