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Caterpillar MaK

9L20

MAK/Caterpillar Marine M-series 4-stroke medium-speed engines. Used as both propulsion and auxiliary in various vessel types.

1800.0 kW

Power

Engine Specifications

9

Cylinders

200 mm

Bore

280 mm

Stroke

1,800 kW

MCR Power

1000.0 rpm

MCR RPM

4-stroke

Stroke Type

Family: Caterpillar/MAK M20C/M25C/M32C/M43C · Tier: IMO Tier II · Fuel: HFO, MDO, MGO

Other Cylinder Configurations 35

4 cyl · 800 kW

6 cyl · 1,110 kW

6 cyl · 2,040 kW

6 cyl · 3,360 kW

6 cyl · 1,200 kW

6 cyl · 3,480 kW

6 cyl · 6,060 kW

6 cyl · 6,600 kW

6 cyl · 2,100 kW

8 cyl · 1,480 kW

8 cyl · 2,720 kW

8 cyl · 4,480 kW

8 cyl · 1,600 kW

8 cyl · 4,640 kW

8 cyl · 8,080 kW

8 cyl · 8,800 kW

8 cyl · 560 kW

8 cyl · 2,800 kW

9 cyl · 1,665 kW

9 cyl · 3,060 kW

9 cyl · 5,040 kW

9 cyl · 5,220 kW

9 cyl · 9,090 kW

9 cyl · 9,900 kW

12 cyl · 12,120 kW

12 cyl · 13,200 kW

12 cyl · 6,960 kW

12 cyl · 840 kW

12 cyl · 895 kW

12 cyl · 4,200 kW

16 cyl · 9,280 kW

16 cyl · 1,120 kW

16 cyl · 1,200 kW

16 cyl · 1,305 kW

16 cyl · 5,600 kW

Components & Design

Component data being added…

Technical Data

Displacement per cylinder 101.3 liters

Power per cylinder 900 kW/cylinder at 500-514 rpm

BMEP 21.3/20.7 bar

Fuel consumption (diesel mode) 186 g/kWh

Fuel injection system Common-Rail-Ignition fuel oil system with cylinder selective gas injection

Turbocharged charge air cooled Yes

Four-stroke non-reversible Yes

IMO compliance IMO Tier II in diesel mode; IMO III in gas mode

Methane slip (gas mode) Minimal (stated as feature; specific values not publicly disclosed)

unified from engine model True

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Common failures & inspection points

Explosion/back-fire and misfire risks in gas mode

Verify functional relief valve systems on fuel gas manifolds and exhaust; check valve set pressure calibration annually

www.ieptechnologies.de/knowledge-ce...

Crankshaft bearing high-temperature wear

Inspect crankshaft bearing thermoelectric voltage via Caterpillar Bearing Condition Monitoring System; examine bearing shells for lead precipitation and surface wear patterns

www.cat.com/en_US/by-industry/marin...

Piston ring liner wear and turbocharger damage interrelation

Measure cylinder liner wear with inside micrometer; inspect piston ring grooves for cracks; perform borescope inspection of turbocharger turbine for blade erosion or damage

www.pon-cat.com/application/files/9...

LNG fuel supply system complexity and regulator/heater reliability

Test LNG regulator pressure response and heater thermostat setpoint; inspect heat exchanger for blockages; verify glycol system circulation and temperature control

www.sciencedirect.com/science/artic...

Type-general inspection and maintenance points for this equipment category — not model-specific.

Suppliers & Spare Parts

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Manuals

operating
MaK M43C Operating Manual
maintenance
MaK M43C Maintenance Manual
spare_parts
MaK M43C Spare Parts Catalogue

Equipment Model #38071 · ✓ still in production