Main Engine 4-Stroke · Main Engines (4-Stroke)
The Bergen C25:33L9 is a medium‑speed, 4‑stroke, 9‑cylinder diesel/dual‑fuel main engine delivering up to 3 375 kW at 1 000 rpm, known for its flexible fuel capability (MDO/HFO/LNG) and extended service intervals.
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“The Bergen C25:33L has a compact footprint and excellent power-toweight ratio, making it ideal for vessels requiring reliable, responsive power in tight spaces. Silent resilient mounting ensures…”
| Lube oil analysis | every 250-500 hours per PMS |
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| Gas detection system function test | per class/IGF code requirement, typically at defined survey intervals |
| Pilot injector service | condition-based, commonly reviewed in the 2,000-4,000 hour range |
| Major overhaul (liners/bearings) | typically in the 20,000-30,000 hour range for medium-speed dual-fuel engines of this class - confirm against Bergen's schedule for the C25:33 |
| Piston ring end gap | typically in the 0.8-1.6 mm range for this bore class (250 mm) - confirm against Bergen's own manual before condemning |
|---|---|
| Main/big-end bearing clearance | check against the manufacturer's cold-clearance table rather than a generic figure |
| Exhaust valve seat recession | track trend at each inspection against the manufacturer's limit |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Continuous Survey Machinery candidate. For dual-fuel operation, class also requires periodic testing of the gas fuel safety system (double-wall piping integrity, gas detection, ventilation) in addition to standard crankshaft deflection and bearing condition checks.
Estimated lifetime: Medium-speed dual-fuel engines of this class typically see major overhaul intervals in the 20,000-30,000 running hour range, with total service life extending well beyond that across multiple overhaul cycles.
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