Cylinder Liner; Cylinder Cover; Crankshaft; Turning Gear And Turning Wheel - Man B&W S50ME-B9.3-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 and drilled holes for cylinder
lubrication.
The Piston Cleaning ring (PC-ring) is installed be-
tween the liner and the cylinder cover, scraping
off excessive ash and carbon formations from the
piston topland.

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 hydraulic
jacks.

Crankshaft

The crankshaft is of the semi-built design, in one
piece, and made from forged steel.
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 ME-B9.5/.3 engines
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. The thrust shaft is
an integrated part of the crankshaft and it is lubri-
cated by the engine's lubricating oil system.
As the propeller thrust is increasing due to the
higher engine power, a flexible thrust cam has
been introduced to obtain a more even force dis-
tribution on the pads.

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.
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 hous-
ing located forward of the foremost main bearing.
The piston is made as an integrated collar on the
main journal, and the housing is fixed to the main
bearing support.
MAN Diesel
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