Main Engine 4-Stroke · Main Engines (4-Stroke)
This marine engine operates on a mechanical heavy-duty trunk piston design, featuring a long-stroke configuration that enhances fuel efficiency and power output. The Caterpillar MaK 6L M601C, with a bore of 601 mm and a stroke of 760 mm, delivers a maximum power output of 6300 kW at 375 rpm. This engine is designed to run on Heavy Fuel Oil (HFO) and is also capable of using diesel, gas, or in a dual-fuel setup. The 6L M601C is part of the discontinued legacy series, with Caterpillar having ceased production of all MaK medium-speed engines in 2022. Common maintenance issues include camshaft wear with excessive axial play, crankshaft bearing wear with cross-bolt scratches, uneven cylinder liner wear, piston ring wear with compression loss, and exhaust valve wear with carbon deposits and leaks. Regular inspections and monitoring systems are essential for maintaining optimal performance and longevity.
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| Fuel injector overhaul | 4000-8000 running hours depending on fuel quality |
|---|---|
| Cylinder head/valve overhaul | 8000-12000 hours, condition-based |
| Piston/liner inspection | 12000-16000 hours, condition-based |
| Turbocharger overhaul | per the maker's time between overhauls, typically 12000-16000 hours |
| Lube oil analysis | every 250-500 hours |
| Overspeed trip test | per class requirement, typically annually |
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 around 0.3-0.5% of bore diameter as a general medium-speed guideline - confirm against the engine manual |
|---|---|
| Piston ring gap | typically 0.8-1.5 mm for this bore class - confirm against the engine's own manual |
| Main/big-end bearing clearance | per the maker's own tolerance table - confirm against the engine manual |
| Exhaust valve seat recession | monitor trend at inspection - confirm the limit in the manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Typically covered under a Continuous Survey Machinery scheme with cylinder units opened on a rotating basis between surveys. Class expects crankshaft deflection records, turbocharger/governor overhaul history, and documented safety trip tests (overspeed, low lube oil pressure) at each survey.
Estimated lifetime: Medium-speed trunk-piston main engines of this class are generally planned for well over 100,000 running hours to major overhaul with proper maintenance and fuel quality control, but this is a general guideline, not a manufacturer-issued figure - confirm the time between overhauls with Caterpillar MaK documentation for this specific model.
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