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MaK (Caterpillar)
7LM43C
The MaK 7LM43C is a 7‑cylinder, 6.65 MW (≈9,000 HP) low‑speed marine diesel engine operating at 500 rpm, distinguished by its compact L‑configuration and turbocharged intercooled design for high specific power.
6650.0 kW
Power
Engine Specifications
7
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
6650
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 #123641
· ✓ still in production