MAN B&W S65ME-C8.2-GI-TII, Project Manual

Page: 23 / 395

MAN B&W 1.06
Page 2 of 7
MAN Diesel 198 89 14-5.2 MAN B&W 90-50ME-C8-GI TII .2 and higher
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, gas valves, a starting valve and an
indicator valve.
The side of the cylinder cover facing the hydrau-
lic cylinder unit (HCU) block has a face for the
mounting of a special valve block, the Gas Control
Block, see later description.
In addition, the cylinder cover is provided with one
set of bores for supplying gas from the gas con-
trol block to each gas injection valve.
Crankshaft
The crankshaft is of the semibuilt type, made
from forged or cast steel throws. For 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, a flange for fitting the
gear wheel for the stepup gear to the hydraulic
power supply unit if fitted on the engine, and the
flange for the turning wheel and for the coupling
bolts to an intermediate 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.
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&WMichell
type, and consists primarily of a thrust collar on
the crankshaft, a bearing support, and segments
of steel lined with white metal.
Engines type 60 and larger with 9 cylinders or
more will be specified with the 360º degree type
thrust bearing, while the 240º degree type is used
in all other engines. MAN Diesel & Turbo’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 it is lubricated by the engine’s lubricat-
ing oil system.
Stepup Gear
In case of mechanically, engine driven Hydraulic
Power Supply, the main hydraulic oil pumps are
driven from the crankshaft via a stepup gear. The
stepup gear is lubricated from the main engine
system.
Turning Gear and Turning Wheel
The turning wheel is fitted to the thrust shaft, and
it is 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 builtin 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.