MAN Engines

MAN D3872 Workboat Engine

MAN V12X yacht engine

MORE DISPLACEMENT FOR SPECIAL REQUIREMENTS

The MAN D3872 workboat engine is a newly developed V12 engine for commercial applications, designed for both light, medium and heavy-duty operation.

  • Displacement
    The MAN D3872 has a displacement of 29.6 litres and currently offers an output of 1,213 kW (1,650 hp) at 2,100 rpm and 1,618 kW (2,200 hp) at 2,300 rpm. Further performance levels for additional applications will be available in the medium term.

  • Applications
    The engine is suitable for various light, medium and heavy duty applications, including wind farm supply vessels (WSV), ferries, passenger vessels and fishing boats.
  • Future-proofing
    The MAN D3872 is future-proof for EU Stage V (in combination with the MAN exhaust gas aftertreatment system), hybrid systems and approved for HVO.
  • Robustness and reliability
    The engine is based on a completely new basic engine that benefits from the findings of the current and established V12 engine series MAN D2862. Numerous measures have been taken to ensure longevity, reliability and future viability here as well.
  • Technical improvements
    Significant changes include an increase in crankcase wall thicknesses, improved bolting, and a new crankshaft with larger bearing diameters.
  • Installation dimensions
    Despite the increased displacement, the MAN D3872 retains the compact installation dimensions of the smaller V12 engine D2862 with a displacement of 24.2 litres.
  • Option
    The engine offers optional outer skin cooling instead of the closed cooling circuit.

An overview of the main design features

MAN V12X yacht engine
New engine ventilation

New engine ventilation

for optimum separation of the oil withinthe closed crankcase ventilation system.

New thermostat housing

New thermostat housing

for optimised coolant supply.

New coolant pump

New coolant pump

for optimised coolant supply. This ensures the usual long service life of MAN engines.

New oil cooler

New oil cooler

for optimum cooling of the oil even at high outputs.

New camshaft

New camshaft

for optimised combustion with the usual low specific fuel consumptions typical of MAN.

New oil-pump

New oil-pump

In addition to fluidic optimisations, new oil pumps and new oil coolers have also been installed, in order to adjust the oil circulation volumes to the high outputs.

New crankshaft

New crankshaft

with increased bearing diameters.

Reinforced crankcase

Reinforced crankcase

with drill hole increased to 138 mm and stroke increased to 165 mm.

New conrods

New conrods

for the transmission of the higher combustion forces.

New pistons

New pistons

due to increased displacement and for optimisation of combustion.

New cylinder heads

New cylinder heads

flow- and cooling-optimised, so as to be able to handle the high outputs.

New valve train

New valve train

for optimum gas exchange even at the highest outputs.

Hydraulic valve lash adjuster

Hydraulic valve lash adjuster

fitted as standard for the first time for marine engines. Regular checking and adjusting of the valve clearance is unnecessary.

2200 bar injection system

2200 bar injection system

The impressively high injection pressure is the basis for the low fuel consumptions and outstanding raw emissions typical of MAN engines.

Technical data

VariantMAN D3872 LE433/436
Arrangement/number of cylindersV12
Bore138 mm
Stroke165 mm
Displacement29,6 l
Rated power2200 hp / 1618 kW
Rated speed2300 rpm
Mean effective pressure7358 Nm / 1200-2100 rpm
Specific output54,7 kW/l
Engine length2335 mm
Engine width1153 mm
Engine height1320 mm
Weight (dry)2720 kg
Injection systemCommon Rail
Engine control unitMD1+
Exhaust statusEPA Tier 3
IMO Tier III
IMO Tier II

VariantMAN D3872 LE443/446
Arrangement/number of cylindersV12
Bore138 mm
Stroke165 mm
Displacement29,6 l
Rated power2000 hp / 1471 kW
Rated speed2300 rpm
Mean effective pressure6689 Nm / 1200-2100 rpm
Specific output49,7 kW/l
Engine length2335 mm
Engine width1153 mm
Engine height1320 mm
Weight (dry)2720 kg
Injection systemCommon Rail
Engine control unitMD1+
Exhaust statusEPA Tier 3
IMO Tier III
IMO Tier II

VariantMAN D3872 LE432/435
Arrangement/number of cylindersV12
Bore138 mm
Stroke165 mm
Displacement29,6 l
Rated power1650 hp / 1213 kW
Rated speed2100 rpm
Mean effective pressure6096 Nm / 1100-1900 rpm
Specific output41,0 kW/l
Engine length2335 mm
Engine width1153 mm
Engine height1320 mm
Weight (dry)2720 kg
Injection systemCommon Rail
Engine control unitMD1+
Exhaust statusEPA Tier 4
EPA Tier 3
IMO Tier III
IMO Tier II

REDUCING EMISSIONS

MAN Engines has approved all marine engines from its current product portfolio for use with regenerative diesel in accordance with the EN15940 standard in Europe and the US specification ASTM D975 of the American Society for Testing and Materials (ASTM). Customers can use it to replace conventional petroleum-based diesel fuel and use so-called green or renewable diesel instead. This is obtained on the basis of waste and residues of animal and plant origin, cellulosic biomass materials such as crop residues, but also so-called HVO (Hydrated Vegetable Oils).

See also: HVO – From edible fat to fuel | MAN Engines