MANL21/31 Marine Diesel Engine Series


WEICHAI-MANL21/31 marine diesel engine series is introduced from German Man Company, the world's first marine diesel engine brand, by signing license production agreement. This series adopts an overall rigid design for high safety. The cylinder unit is assembled as a whole and is easy to assembled and disassembled. It uses Man’s advanced turbocharger and two-stage intercooling for excellent air intake performance. It adopts Man’s SaCosone safety control system for high reliability. It is well adapted for burning MGO, MDO or HFO.

This series is mainly used as ship propeller and generator sets. The products used as propeller are divided into 6, 7, 8, and 9 cylinders. The speed is 1000r/min, power covers 1290-1935kW, minimum fuel consumption is 192g/kWh, and oil consumption is 0.8g/kWh. The product is of excellent power and economy.

Product Parameters

Series 4-Stroke, Water cooling, In-Line, Supercharged and cold
Cylinder Diameter/Stroke 210×310mm
Specific lub-oil consumption 192g/kW-h
Start Mode Gas start
Noise ≤110dB (A)
Oil Consumption 0.8g/kW-h
Number Of Cylinders 6/7/8/9
Displacement 64.2/74.9/85.6/96.3L
Crankshaft Rotation Direction (towards free end) Clockwise / Anticlockwise
Idling 450±50r/min
Smoke Intensity ≤1.0Rb
Emission Standard IMO TIER II

Product Spectrum

Model Air intake Rated Power (kW/Ps) Speed (r/min)
6L21/31 Supercharged and cold 1290/1755 1000
7L21/31 Supercharged and cold 1505/2050 1000
8L21/31 Supercharged and cold 1720/2340 1000
9L21/31 Supercharged and cold 1935/2630 1000


Product parameters and portfolio are for reference only. For fishing vessel engine portfolio, please contact relevant personnel for official information.

Product Features

Power: Wide power coverage, 1290kW——1935kW.

Economy: The minimum fuel consumption is 192g/kW?h and the oil consumption rate is less than 0.8g/kW·h.

Reliability: Unique structural design and MAN's advanced SaCoS safety control system guarantee engines’trouble-free operation, and long overhaul interval.

Adaptability: It is well adaptable for burning MGO, MDO and HFO (viscosity up to 700cSt/50°C). It could provide the best turbocharging system matching solution according to engine’s working conditions.

Environment protection: Meets the requirements of the International Maritime Organization (IMO) for the Tier II phase of the engine.

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