MAN B&W 1.06
Page 3 of 7
MAN Diesel
198 74 728.0MAN B&W S50MC/MC-C-TII, S46MC-C-TII, S42MC-TII,
S35MC-TII, L35MC-TII, S26MC-TII
The piston is made as an integrated collar on the
main crank journal, and the housing is fixed to
the main bearing support. For functional check of
the vibration damper a mechanical guide is fitted,
while an electronic vibration monitor can be sup-
plied as an option.
Tuning Wheel/
Torsional Vibration Damper
A tuning wheel or torsional vibration damper may
have to be ordered separately, depending on the
final torsional vibration calculations.
Connecting Rod
The connecting rod is made of forged steel and
provided with bearing caps for the crosshead and
crankpin bearings.
The crosshead and crankpin bearing caps are se-
cured to the connecting rod with studs and nuts
tightened by means of hydraulic jacks.
The crosshead bearing consists of a set of
thinwalled steel shells, lined with bearing metal.
The crosshead bearing cap is in one piece, with
an angular cutout for the piston rod.
The crankpin bearing is provided with thinwalled
steel shells, lined with bearing metal. Lube oil is
supplied through ducts in the crosshead and con-
necting rod.
Piston
The piston consists of a piston crown and piston
skirt. The piston crown is made of heatresistant
steel. A piston cleaning ring located in the very
top of the cylinder liner scrapes off excessive ash
and carbon formations on the piston topland.
The piston has four ring grooves which are
hardchrome plated on both the upper and lower
surfaces of the grooves. The uppermost piston
ring is of the Controlled Pressure Relief type (CPR),
whereas the other three piston rings all have an
oblique cut. All four rings are alu-coated on the
outer surface for running-in.
The piston skirt is made of cast iron with a bronze
band.
Piston Rod
The piston rod is of forged steel and is surface-
hardened on the running surface for the stuffing
box. The piston rod is connected to the cross-
head with four bolts. The piston rod has a central
bore which, in conjunction with a cooling oil pipe,
forms the inlet and outlet for cooling oil.
Crosshead
The crosshead is of forged steel and is provided
with cast steel guide shoes of low-friction design
with white metal on the running surface.
The telescopic pipe for oil inlet and the pipe for oil
outlet are mounted on the guide shoes.
Scavenge Air System
The air intake to the turbocharger takes place
directly from the engine room through the turbo-
charger intake silencer. From the turbocharger,
the air is led via the charging air pipe, air cooler
and scavenge air receiver to the scavenge ports
of the cylinder liners, see Chapter 14.
Scavenge Air Cooler
For each turbocharger a scavenge air cooler of
the monoblock type is fitted. The cooler is de-
signed as a central cooling system cooled by
freshwater of maximum 4.5 bar working pressure.
Alternatively, a seawater cooling system with up to
2.0 2.5 bar working pressure can be chosen.
The scavenge air cooler is so designed that the
difference between the scavenge air temperature
and the water inlet temperature at specified MCR
can be kept at about 12 °C.
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