Main Engine 4-Stroke · Main Engines (4-Stroke)
The MAN 18V48/60CR is an 18‑cylinder V‑type medium‑speed marine diesel engine delivering up to 19,800 kW at 500 rpm, featuring a high‑pressure common‑rail injection system and Tier III emissions compliance.
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| Lube oil analysis | every 250-500 hours |
|---|---|
| Injector/common-rail component inspection | per condition-based monitoring, typically 8,000-12,000 hours or on alarm trend |
| Turbocharger overhaul | typically 12,000-16,000 hours |
| Cylinder liner/piston overhaul | typically 16,000-24,000 hours, condition-based |
| SCR catalyst inspection (if fitted) | typically annual or per the maker's schedule |
| Main bearing inspection | typically 12,000-16,000 hours or per the class CSM scheme |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner wear | typically up to about 0.3-0.4% of nominal bore before renewal is considered - confirm against the maker's manual |
|---|---|
| Main bearing clearance | typically 0.20-0.45 mm depending on journal diameter - confirm against maker's tables |
| Piston ring gap | typically 1.0-2.0 mm for this bore class - confirm against maker's tables |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Engines this size are typically enrolled in Continuous Survey of Machinery (CSM), allowing component-based renewal instead of a fixed overhaul date. For Tier III compliance via SCR, class will also want NOx Technical Code documentation and SCR maintenance records. Crankcase inspection, governor/overspeed trip tests and bearing clearance records are typically required at each survey window.
Estimated lifetime: Large medium-speed trunk piston main engines of this class are typically designed for 80,000-120,000+ running hours between major overhauls or renewals, with liners, pistons and injection components renewed on shorter condition-based cycles - actual life depends on load profile, fuel quality and maintenance regime.
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