Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN 18V48/60CR is an 18‑cylinder V‑configuration medium‑speed marine diesel engine delivering up to ~21.6 MW, distinguished by its high‑pressure common‑rail fuel injection and two‑stage constant‑pressure turbocharging.
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| Cylinder lubrication feed rate review | trended continuously via BN and iron-content analysis, formal review at least monthly |
|---|---|
| Fuel injector overhaul/exchange | typically every 8,000-12,000 hours, strongly fuel-quality dependent - confirm against MAN's schedule |
| Turbocharger turbine-side cleaning | typically every 500-1,000 hours on HFO, or on differential-pressure/speed deviation |
| Cylinder liner and piston inspection | typically every 12,000-16,000 hours or per the running-hours scheme in MAN's condition-based maintenance system |
| Exhaust valve overhaul | typically every 8,000-12,000 hours, condition dependent |
| Lube oil analysis | typically every 500 hours or monthly, whichever comes first |
| Charge-air cooler cleaning | typically every 4,000-6,000 hours or on pressure-drop deviation |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner bore wear | typically flagged for renewal around 0.3-0.5 mm cumulative wear per 100 mm bore diameter - confirm against MAN's limits for the 48/60 bore class |
|---|---|
| Piston ring end gap | typically 1.0-2.0 mm for this bore class when new/serviced - confirm against the maker manual for the wear limit |
| Main bearing clearance | typically 0.20-0.40 mm depending on journal diameter - confirm against maker limits |
| Exhaust valve seat recession | flag for reconditioning once recession approaches the maker's stated limit, commonly a low single-digit mm figure - confirm against the maker manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Under CSM, class will expect crankshaft deflection records, cylinder condition (liner/piston/ring) inspection records at maker-recommended intervals, turbocharger overhaul records, and correct documentation of running-hour-based component exchanges tracked in the maker's condition-based maintenance system (e.g. MAN CoCoS).
Estimated lifetime: Large medium-speed engines of this class are typically cited with a major overhaul interval in the range of 24,000-32,000 hours depending on fuel quality and duty cycle, with total engine life extending well beyond that under a proper overhaul regime.
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