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Presentation
The D12D-C MH is an in-line, direct injection 6-cylinder marine diesel engine.
The engine has electronically controlled fuel injection, a turbocharger, aftercooler, heat exchanger and thermo-
statically controlled freshwater cooling, electronically controlled engine speed control and shifting.
The exhaust manifold and turbocharger are freshwater cooled to reduce heat radiation to the engine room
Technical description
Engine and cylinder block
– The cylinder block and cylinder head are manu-
factured of alloyed cast iron
– Induction hardened crankshaft journalled in seven
main bearings
– Replaceable wet cylinder liners
– Gallery oil cooled cast aluminium pistons
– Three piston rings, including a “keystone” type top
ring
– Induction hardened overhead camshaft with roller
rocker arms
– Four valves per cylinder
– Replaceable valve seats and valve guides
Fuel system
– Microprocessor based fuel supply control unit
– Gear driven fuel feed pump
– Centrally located unit injectors with electromag-
netically controlled fuel valves
– Spin-on fine fuel filter with water trap
Lubrication system
– Freshwater cooled oil cooler
– Gear driven oil pump
– Side mounted or rear mounted full flow and by-
pass oil filters of spin-on type
Turbocharging system
– Turbocharger with freshwater cooled turbine hous-
ing
Cooling system
– Tube heat exchanger ( or 1- circuit keel cooling)
with expansion tank
– Plate type freshwater cooled aftercooler
– Gear driven seawater pump
Electrical system
– 24V electrical system, alternator (60A) with
charge sensor
– Engine mounted emergency stop button
– Power modul
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