MAN B&W
1.06
Page 6 of 7
MAN Diesel
MAN B&W S50MC/MC-C-TII, S46MC-C-TII, S42MC-TII,
S35MC-TII, L35MC-TII, S26MC-TII
198 74 728.0
Exhaust Valve
The exhaust valve consists of the valve housing
and the valve spindle. The valve housing is made
of cast iron and is arranged for water cooling. The
housing is provided with a water cooled bottom
piece of steel with a flame-hardened seat of the
W-seat design.
On S50MC and S50MC-C, the exhaust valve spin-
dle is either a DuraSpindle or made of Nimonic.
On engines type 46 and smaller, DuraSpindle is
the basic execution and a spindle made of Ni-
monic an option. The housing is provided with a
spindle guide in any case.
The exhaust valve is tightened to the cylinder cov-
er with studs and nuts. It is opened hydraulically
and closed by means of air pressure. The hydrau-
lic system consists of a piston actuator placed
on the roller guide housing, a highpressure pipe,
and a working cylinder on the exhaust valve. The
piston actuator is activated by a cam on the cam-
shaft.
In operation, the valve spindle slowly rotates, driv-
en by the exhaust gas acting on small vanes fixed
to the spindle.
On engines type 50, 46, 42 and 35, sealing of the
exhaust valve spindle guide is provided by means
of Controlled Oil Level (COL), an oil bath in the
bottom of the air cylinder, above the sealing ring.
This oil bath lubricates the exhaust valve spindle
guide and sealing ring as well.
On S26MC6, sealing of the exhaust valve spindle
guide is provided by means of sealing air.
Cylinder Lubrication
The cylinder lubrication system can be of either
the electronic MAN B&W Alpha cylinder lubrica-
tion system or a mechanical type.
The cylinder lubrication systems are described in
detail in Chapter 9.
Manoeuvring System
The engine is provided with a pneumatic/electric
manoeuvring and fuel oil regulating system. The
system transmits orders from the separate ma-
noeuvring consoles to the engine.
The regulating system makes it possible to start,
stop, reverse the engine and control the engine
speed. The speed control on the manoeuvring
console gives a speedsetting signal to the gover-
nor, dependent on the desired number of revolu-
tions.
At shut-down, the fuel injection is stopped by the
puncture valves in the fuel pumps being activated,
independently of the speed control. At reversing
,
the displaceable rollers in the driving mechanism
for the fuel pumps are moved to the ‘Astern’ posi-
tion by an air cylinder controlled by the starting air
distributor.
The engine is provided with an engine side
mounted console and instrument panel.
Reversing
On reversible engines (with Fixed Pitch Propel-
lers mainly), reversing of the engine is performed
by means of an angular displaceable roller in the
driving mechanism for the fuel pump of each
engine cylinder. The reversing mechanism is acti-
vated and controlled by compressed air supplied
to the engine.
The exhaust valve gear is not to be reversed.
Gallery Arrangement
The engine is provided with gallery brackets,
stanchions, railings, platforms, and ladders be-
tween platforms. The brackets are placed at such
a height as to provide the best possible overhaul-
ing and inspection conditions.
The engine is prepared for top bracings on the ex-
haust side, or on the manoeuvring side.
Summary of Contents for B&W S50MC-C8-TII
Page 4: ......
Page 10: ......
Page 18: ......
Page 19: ...MAN B W MAN Diesel Engine Design 1 ...
Page 20: ......
Page 35: ...MAN B W MAN Diesel Engine Layout and Load Diagrams SFOC 2 ...
Page 36: ......
Page 52: ......
Page 64: ......
Page 65: ...MAN B W MAN Diesel Turbocharger Selection Exhaust Gas By pass 3 ...
Page 66: ......
Page 72: ......
Page 73: ...MAN B W MAN Diesel Electricity Production 4 ...
Page 74: ......
Page 106: ......
Page 107: ...MAN B W MAN Diesel Installation Aspects 5 ...
Page 108: ......
Page 146: ......
Page 170: ......
Page 171: ...MAN B W MAN Diesel List of Capacities Pumps Coolers Exhaust Gas 6 ...
Page 172: ......
Page 192: ......
Page 193: ...MAN B W MAN Diesel Fuel 7 ...
Page 194: ......
Page 208: ......
Page 209: ...MAN B W MAN Diesel Lubricating Oil 8 ...
Page 210: ......
Page 223: ...MAN B W MAN Diesel Cylinder Lubrication 9 ...
Page 224: ......
Page 233: ...MAN B W MAN Diesel Piston Rod Stuffing Box Drain Oil 10 ...
Page 234: ......
Page 236: ......
Page 237: ...MAN B W MAN Diesel Central Cooling Water System 11 ...
Page 238: ......
Page 243: ...MAN B W MAN Diesel Seawater Cooling System 12 ...
Page 244: ......
Page 254: ......
Page 255: ...MAN B W MAN Diesel Starting and Control Air 13 ...
Page 256: ......
Page 262: ......
Page 263: ...MAN B W MAN Diesel Scavenge Air 14 ...
Page 264: ......
Page 276: ......
Page 277: ...MAN B W MAN Diesel Exhaust Gas 15 ...
Page 278: ......
Page 292: ......
Page 293: ...MAN B W MAN Diesel Engine Control System 16 ...
Page 294: ......
Page 309: ...MAN B W MAN Diesel Vibration Aspects 17 ...
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Page 324: ......
Page 325: ...MAN B W MAN Diesel Monitoring Systems and Instrumentation 18 ...
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Page 349: ...MAN B W MAN Diesel Dispatch Pattern Testing Spares and Tools 19 ...
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Page 389: ...MAN B W MAN Diesel Project Suppport and Documentation 20 ...
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Page 399: ...MAN B W MAN Diesel Appendix A ...
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