Main Engine 4-Stroke · Main Engines (4-Stroke)
The Bergen C25:33L is a medium‑speed, four‑stroke diesel main engine (6–9 cylinders) used for ship propulsion and generator sets, featuring a 250 mm bore, 330 mm stroke, turbocharging with two‑stage charge‑air cooling and flexible rating from 720 to 1000 rpm.
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What our service work and the manufacturer documentation say about keeping this model running.
Follow Bergen schedule for cylinder head, injector, turbocharger and bearing inspections.
| Cylinder head top overhaul (valves, springs, seats) | 8,000 - 12,000 running hours |
|---|---|
| Fuel Injector overhaul/replacement | 3,000 - 6,000 running hours |
| Turbocharger inspection/cleaning | 8,000 - 12,000 running hours |
| Piston overhaul (rings, piston crown inspection) | 12,000 - 18,000 running hours |
| Main and connecting rod bearing inspection/renewal | 24,000 - 36,000 running hours |
| Major engine overhaul (crankshaft inspection, liner renewal) | 48,000 - 72,000 running hours |
| Cylinder liner wear | Max 0.6 - 0.8 mm total ovality/taper from new diameter. |
|---|---|
| Crankshaft deflection | Max 0.05 - 0.10 mm (depending on engine length and manufacturer spec). |
| Main/Connecting rod bearing clearance | Max 0.15 - 0.25 mm over new clearance. |
| Exhaust valve seat recession | Max 0.5 - 1.0 mm from original position. |
| Piston ring groove wear | Max 0.1 - 0.2 mm increase in axial clearance. |
| Turbocharger rotor axial play | Max 0.15 - 0.25 mm (refer to specific TC manufacturer data). |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor typically checks: Review of engine logbooks (running hours, maintenance records, alarm history, fuel consumption). Verification of safety devices (overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown, oil mist detector alarm/shutdown). Fuel oil system integrity (leaks, proper screening of high-pressure lines, fire insulation, emergency shutdown). Exhaust gas system condition (insulation, expansion bellows, absence of leaks). Engine mountings and foundation bolts for tightness, corrosion, and signs of movement. Crankshaft deflection readings (required at specific intervals, e.g., 2.5 or 5-year surveys). Emergency stop functionality (local and remote). General cleanliness and housekeeping in the engine vicinity. Review of recent lube oil analysis reports and compliance with planned maintenance system.
Estimated lifetime: 80,000 - 120,000 hours before major overhaul (e.g., crankshaft regrinding, block line boring, full component renewal), assuming diligent maintenance.
Keep injector nozzles, exhaust valves, gasket kits, filters and bearing shells.
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