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MaK (Caterpillar)
6LM43C
The MaK 6LM43C is a six‑cylinder, 5.7 MW (≈7 800 hp) medium‑speed, four‑stroke trunk piston marine diesel engine operating at 500 rpm, noted for its robust nodular cast‑iron construction and proven reliability in the 5–9 MW class.
5700.0 kW
Power
Engine Specifications
6
Cylinders
430 mm
Bore
610 mm
Stroke
4-stroke
Stroke Type
Components & Design
Component data being added…
Technical Data
SFOC (Specific Fuel Oil Consumption)
175–178 g/kWh (HFO optimized)
Lube Oil Consumption
0.6 g/kWh standard; 0.3 g/kWh optional
Engine Type
4-stroke turbocharged intercooled non-reversible with direct injection
Cylinder Block Material
Nodular cast iron (Kugelgraphitguss)
Turbocharger Maintenance Interval
15,000 operating hours (inspection/cleaning)
Per-Cylinder Power Output
~700–760 kW/cylinder
Engine Centre Distance
3400 mm
Charge Air Cooler
Cast casing with 40% increased base area for turbocharger mounting
power kw
5700
rpm
500
fuel type
HFO/MDO
configuration
L
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Common failures & inspection points
Heavy fuel oil corrosion of cylinder liners and piston rings due to high sulfur content; nodular cast iron offers improved wear resistance vs. gray iron but req
Turbocharger bearing wear and seizure from contaminated or degraded lube oil; tight clearances vulnerable to sluggish operation or complete seizure if oil break
Fuel injector nozzle carbon deposits and stiction (sticking) from poor fuel quality (high viscosity, low volatility); coke accumulation at nozzle holes can caus
Intake and exhaust rocker arm bearing wear requiring clearance checks every 30,000 hours; bearing surfaces (ball pin, adjusting screw) subject to friction and w
Main running gear (crankshaft, bearings, piston skirts, liners) susceptible to seizure and discoloration from inadequate lube oil separation/filtration; long-st
Type-general inspection and maintenance points for this equipment category — not model-specific.
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Equipment Model #123640
· ✓ still in production