Man B&W S50MC-C8-TII User Manual

MAN B&W 1.06
Page 4 of 7
MAN Diesel
MAN B&W S50MC/MC-C-TII, S46MC-C-TII, S42MC-TII,
S35MC-TII, L35MC-TII, S26MC-TII
198 74 728.0
Auxiliary Blower
The engine is provided with electricallydriven
scavenge air blowers. The suction side of the
blowers is connected to the scavenge air space
after the air cooler.
Between the air cooler and the scavenge air receiv-
er, nonreturn valves are fitted which automatically
close when the auxiliary blowers supply the air.
The auxiliary blowers will start operating con-
secutively before the engine is started in order to
ensure sufficient scavenge air pressure to obtain
a safe start.
Further information is given in Chapter 14.
Exhaust Gas System
From the exhaust valves, exhaust gas is led to the
exhaust gas receiver where the fluctuating pres-
sure from the individual cylinders is equalised,
and the total volume of gas is led further on to the
turbocharger(s). After the turbocharger(s), the gas
is led to the external exhaust pipe system.
Compensators are fitted between the exhaust
valves and the receiver, and between the receiver
and the turbocharger(s).
The exhaust gas receiver and exhaust pipes are
provided with insulation, covered by galvanised
steel plating.
A protective grating is installed between the ex-
haust gas receiver and the turbocharger.
Exhaust Turbocharger
The engines can be fitted with either MAN Diesel,
ABB or Mitsubishi turbochargers.
The turbocharger choice is described in Chapter
3, and the exhaust gas system in Chapter 15.
Camshaft and Cams
The camshaft is made in one piece with exhaust
cams, fuel cams, and indicator drive cams.
The exhaust cams and fuel cams are made of
steel, with a hardened roller race, and are shrunk
onto the shaft. They can be adjusted and disman-
tled hydraulically.
The cam for the indicator drive can be adjusted
mechanically.
The camshaft bearings mainly consist of one
lower half-shell fitted in a bearing support, except
on S50MC which has an upper half shell, too. The
camshaft is lubricated by the main lubricating oil
system.
Chain Drive
The camshaft is driven from the crankshaft by a
chain drive, which is kept running tight by a manu-
ally adjusted chain tightener. The long free lengths
of chain are supported by rubber-clad guidebars
and the chain is lubricated through oil spray pipes
fitted at the chain wheels and guidebars.
Indicator Drive
As separate options, the engine can be supplied
with either an indicator drive, a mechanical indica-
tor system, or the so-called PMI system, a pres-
sure analyser system, described in section 18.02.
The indicator drive consists of a cam fitted on the
camshaft and a springloaded spindle with a roller
which moves up and down in accordance with the
movement of the piston within the engine cylinder.
At the top, the spindle has an eye to which the
indicator cord is fastened after the indicator has
been installed on the indicator valve.

Man B&W S50MC-C8-TII Specifications

General

Brand	Man
Model	B&W S50MC-C8-TII
Category	Engine
Language	English