Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN 7L48/60CR is a 7‑cylinder, medium‑speed (500 rpm) marine diesel engine delivering about 8.4 MW of power, distinguished by its high‑pressure common‑rail fuel injection and two‑stage turbocharging for low specific fuel consumption.
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| Injector inspection/exchange | typically every 8,000-12,000 running hours or per the maker's PMS - confirm against MAN's manual |
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| Cylinder liner/piston inspection | typically every 12,000-16,000 hours |
| Turbocharger overhaul | typically every 12,000-24,000 hours |
| Lube oil analysis | every 500 running hours or monthly |
| Valve clearance check | per maker's schedule, typically every 4,000-6,000 hours |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner wear | medium-speed engines of this class are generally reassessed in the region of 0.3-0.5 mm per 100 mm bore diameter as a general benchmark - confirm the exact MAN 48/60CR limit in the engine manual |
|---|---|
| Piston ring gap | compare the measured gap against the maker's new and maximum allowable gap for this bore rather than a generic figure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
MAN 48/60CR engines fall under Continuous Survey Machinery; class typically reviews crankshaft deflection readings, cylinder unit overhaul records, common rail pressure/leak-off trend data and turbocharger condition at each survey cycle.
Estimated lifetime: Medium-speed four-stroke engines of this class are generally designed for a major overhaul cycle in the order of 24,000-32,000 running hours per cylinder unit, with overall engine service life well beyond 100,000 hours given proper maintenance - confirm intervals against MAN's maker's manual
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