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MAN Energy Solutions

MAN 12V51/60DF

The MAN 12V51/60DF is a V‑12, low‑speed (500 rpm) dual‑fuel marine diesel engine delivering ~12.6 MW, capable of running on LNG, HFO or MGO with seamless fuel switching.

MAN Energy Solutions MAN 12V51/60DF
12000.0 kW
Power

Engine Specifications

12
Cylinders
510 mm
Bore
600 mm
Stroke

Components & Design

Component data being added…

Technical Data

Swept Volume per Cylinder 122.6 dm³
Output per Cylinder (MCR) 1050 kW @ 500-514 rpm
Diesel Fuel Consumption (85% MCR) 176 g/kWh
Gas Mode Consumption (85% MCR) 7150 kJ/kWh
Dry Mass - 12V51/60DF (Propulsion) 189 t
Dry Mass - 18V51/60DF (Propulsion) 265 t
Engine Cycle Four-Stroke
Emissions Compliance IMO Tier II, IMO Tier III (Gas & Diesel+SCR modes)
Fuel Flexibility Seamless switching between gas/liquid during operation
configuration V
rpm 500
fuel type LNG/HFO/MGO
technology Dual-Fuel Common Rail (LNG/HFO/MGO)
displacement l per cyl 122.6

Related equipment 10

MAN Energy Solutions 10L31 same series MAN Energy Solutions 10PC2.6 same series MAN Energy Solutions 10PC4.2 same series MAN Energy Solutions 12L51/60DF same series MAN Energy Solutions 12L51/60G same series MAN Energy Solutions 12PA6B STC same series MAN Energy Solutions 12PC2.6 same series MAN Energy Solutions 12PC4.2 same series MAN Energy Solutions 12VV175D same series MAN Energy Solutions 12VV32/40 same series

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Common failures & inspection points

Lubricating Oil System Contamination: Extended operation with activated contamination display can lead to lube oil supply problems; running-in filter must be re
Piston Temperature Management: Crown scuffing risk if operating conditions cause thermal expansion to reduce piston-liner clearance; typically from over-fueling
Gas Fuel System Integrity: Dual-fuel systems require strict maintenance of gas supply cleanliness and pressure relief systems; hydrocarbon sensor monitoring ess
Turbocharger Boost Management: Stock turbocharger limitations at low-speed regions can compromise fuel consumption and combustion mode performance in dual-fuel
Cross-Head Bearing Maintenance: While MAN V51/60DF features optimized marine-head design for reduced service downtime, proper oil film maintenance and periodic

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

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Equipment Model #66707 · ✓ still in production

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GOLDEN OCEAN MARINE SERVICES · EgyptGulf Turbo Solutions FZC · SingaporeLubrafil BV · NetherlandsMancraft AS · NorwayMarine Technics Baltia OÜ · EstoniaHyundai One Asia Pte. Ltd. · Singapore +6 more
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