"> MAN Energy Solutions 9L16/24DF
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MAN Energy Solutions

9L16/24DF

The MAN 9L16/24DF is a 9‑cylinder, in‑line, 4‑stroke dual‑fuel marine diesel engine delivering up to 990 kW at 1200 rpm, capable of running on LNG or MDO with IMO Tier II NOx compliance.

990.0 kW
Power

Engine Specifications

9
Cylinders
160 mm
Bore
240 mm
Stroke
4-stroke
Stroke Type

Components & Design

Component data being added…

Technical Data

Configuration In-line, 4-stroke, turbocharged diesel engine
Bore x Stroke 160 mm × 240 mm
Cylinders available 5, 6, 7, 8, 9
Power at 1000 rpm 5L: 450 kW; 6L: 570 kW; 7L: 665 kW; 8L: 760 kW; 9L: 855 kW
Power at 1200 rpm 5L: 500 kW; 6L: 660 kW; 7L: 770 kW; 8L: 880 kW; 9L: 990 kW
Piston speed 8 m/s @ 1000 rpm; 9.6 m/s @ 1200 rpm
BMEP (Brake Mean Effective Pressure) 22.4 bar @ 1000 rpm; 20.7 bar @ 1200 rpm
Max combustion pressure 170 bar
Compression ratio 15.2:1
Swept volume per cylinder 4.8 liters
Weight range 9.5 to 13.1 tonnes
Dimensions (max) 1 m (width) × 2.4 m (height) × 5.8 m (length)
Fuel specification HFO up to 700 cSt/50°C; heavy fuel oil compliant
Engine type 4-stroke, in-line, turbocharged diesel, single-acting
Marine classification IMO Tier II compliant auxiliary/genset engine
power kw 990
rpm 1200
fuel type LNG/MDO (Dual-Fuel)
configuration L

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Common failures & inspection points

Valve clearance adjustment failures causing valve bridge guide stress and engine breakdown

Verify valve clearance adjustment per manufacturer specification; incorrect adjustment leads to excessive stress on valve bridge guides and potential engine damage

Connecting rod bolt preload inconsistency - gap detected between bolt head and connecting rod in fully tightened assembled condition

Inspect connecting rod assembly for gaps between bolt head and rod; follow updated MAN tightening procedure to minimize maintenance-induced failure risk

Lube oil cooler overstress from improper power tool tightening and single-bolt procedures on pressurized coolers

Visually inspect all cooler bolts and nuts; replace if damage detected or if any doubt about integrity exists; avoid power tools on pressurized systems

Coolant water quality and treatment deficiency causing operational damage (nitrite-based additives require strict monitoring)

Monitor cooling water pH and nitrite additive concentration per schedule; inspect for sludging and water treatment adequacy; continuous lube oil separator operation mandatory for IMO NOx-retarded engines

Fuel injection valve opening pressure drop (up to 50 bar) after few operating hours when new nozzles installed

Verify fuel injection valve opening pressure within specification after new nozzle installation; monitor pressure drop during break-in period; deviation >40°C exhaust gas outlet temperature between cylinders indicates fuel valve inspection needed

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

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Equipment Model #123773 · ✓ still in production