6LL48/60CR
The MAN 6LL48/60CR is a medium‑speed, 6‑cylinder inline diesel engine delivering up to 7 200 kW at ~514 rpm, featuring advanced common‑rail fuel injection for low emissions and high power density.
Engine Specifications
Inspector Detail
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Common issues
- Fuel injector deposits and carbon buildup due to high pressure common rail system
- Cylinder liner wear and scuffing due to high compression ratios
- Exhaust valve seat wear and overheating due to high exhaust gas temperatures
- Fuel pump failure due to high pressure and low lubricity fuels
- Crankshaft bearing wear and fatigue due to high loads and vibration
- Piston ring wear and blow-by due to high cylinder pressures
- Turbocharger fouling and surge due to high exhaust gas temperatures and pressures
Inspection checklist
- Cylinder head and valve condition
- Fuel injector condition and spray pattern
- Cylinder liner and piston condition
- Crankshaft and bearing condition
- Turbocharger condition and performance
- Exhaust gas temperature and pressure monitoring
- Fuel system leaks and pressure testing
- Lubrication system condition and oil analysis
- Cooling system condition and performance
Service intervals
| oil_change | 1000-1500 hours |
| fuel_filter_change | 500-1000 hours |
| air_filter_change | 1000-2000 hours |
| cylinder_head_overhaul | 12000-18000 hours |
| major_overhaul | 30000-40000 hours |
Typical wear limits
| cylinder_liner | 0.5-1.0 mm wear limit |
| piston_ring | 0.5-1.0 mm wear limit |
| crankshaft_bearing | 0.1-0.5 mm wear limit |
| exhaust_valve_seat | 0.5-1.0 mm wear limit |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Fuel injectors
- Cylinder liners
- Piston rings
- Crankshaft bearings
- Turbocharger components
- Exhaust valve seats
- Cylinder head gaskets
Safety
- High pressure fuel system leaks and fires
- Exhaust gas temperature and pressure monitoring
- Crankshaft and bearing failure due to high loads and vibration
- Turbocharger surge and explosion due to high exhaust gas temperatures and pressures
- Electrical system faults and arcing due to high voltage and current
Class survey
Class surveyor typically checks cylinder head and valve condition, fuel injector condition and spray pattern, cylinder liner and piston condition, crankshaft and bearing condition, turbocharger condition and performance, and exhaust gas temperature and pressure monitoring
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection of injector nozzles for carbon deposits; pressure test injectors at maintenance intervals; monitor fuel system pressure for irregularities; check injector spray patterns
Cylinder bore scope inspection for microcracks in ring grooves; measure ring wear patterns; test for water in lube oil via Karl Fischer moisture test; inspect piston rings for glazing or scuffing
Monthly/quarterly water drain from fuel tank; Dean/Stark Karl Fischer moisture analysis of fuel; inspect fuel line color and smell for emulsification; monitor accumulator/pump outlet for milky appearance
Borescope inspection of piston crown and ring grooves during overhaul; measure cylinder liner wear patterns and surface finish; temperature monitoring for ring zone overheating; verify use of cermet-coated rings installed
Visual inspection of turbo bearing play and thrust movement; check waste gate actuator response to manual testing; monitor exhaust back-pressure for abnormalities; verify clean oil supply to turbo bearings; inspect oil cooler for proper function
Type-general inspection and maintenance points for this equipment category — not model-specific.
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