Cylinder Liner; Cylinder Cover; Crankshaft; Thrust Bearing - Man B&W S50MC-C8-TII Project Manual

MAN B&W

Cylinder Liner

The cylinder liner is made of alloyed cast iron
and is suspended in the cylinder frame with a
lowsituated flange. The top of the cylinder liner is
fitted with a cooling jacket.
The cylinder liner has scavenge ports, drilled
holes for cylinder lubrication and is prepared for
installation of temperature sensors, if required.

Cylinder Cover

The cylinder cover is of forged steel, made in one
piece, and has bores for cooling water. It has a
central bore for the exhaust valve, and bores for
the fuel valves, a starting valve and an indicator
valve.
The cylinder cover is attached to the cylinder
frame with studs and nuts tightened with hydrau-
lic jacks.

Crankshaft

The crankshaft is mainly of the semibuilt type,
made from forged or cast steel throws while fully
forged in the S35MC7, L35MC6 and S26MC6
engines. In engines with 9 cylinders or more the
crankshaft is supplied in two parts.
At the aft end, the crankshaft is provided with the
collar for the thrust bearing, and the flange for the
turning wheel and for the coupling bolts to an in-
termediate shaft.
At the front end, the crankshaft is fitted with the
collar for the axial vibration damper and a flange
for the fitting of a tuning wheel. The flange can
also be used for a Power Take Off, if so desired.
Coupling bolts and nuts for joining the crankshaft
together with the intermediate shaft are not nor-
mally supplied.
MAN B&W S50MC/MC-C-TII, S46MC-C-TII, S42MC-TII,
S35MC-TII, L35MC-TII, S26MC-TII

Thrust Bearing

The propeller thrust is transferred through the
thrust collar, the segments, and the bedplate, to
the end chocks and engine seating, and thus to
the ship's hull.
The thrust bearing is located in the aft end of the
engine. The thrust bearing is of the B&WMichell
type, and consists primarily of a thrust collar on
the crankshaft, a bearing support, and segments
of steel lined with white metal.
MAN Diesel's flexible thrust cam design is used
for the thrust collar on a range of engine types.
The thrust shaft is an integrated part of the crank-
shaft and lubricated by the engine's lubricating oil
system.
Turning Gear and Turning Wheel
The turning wheel is fitted to the thrust shaft and
driven by a pinion on the terminal shaft of the
turning gear, which is mounted on the bedplate.
The turning gear is driven by an electric motor
with builtin gear with brake.
A blocking device prevents the main engine from
starting when the turning gear is engaged. En-
gagement and disengagement of the turning gear
is effected manually by an axial movement of the
pinion.
The control device for the turning gear, consisting
of starter and manual control box, can be ordered
as an option.
Axial Vibration Damper
The engine is fitted with an axial vibration damper,
mounted on the fore end of the crankshaft. The
damper consists of a piston and a splittype
housing located forward of the foremost main
bearing.
MAN Diesel
1.06
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