Valve actuating gear
Drive of the push rod for the inlet and exhaust
valves is from the camshaft via inlet and exhaust
rocking levers supported on a joint pillow, with the
cam movements being transmitted via a follower.
The push rod movement is in the cylinder head
transmitted to short rockers, and from these to a
guided, spring-loaded yoke. This yoke operates two
equal valves each.
The pillow supporting the rocking levers (the rocking
lever casing) is bolted to the cylinder head.
Bearing bushes, ball pans and yokes are lubricated
by means of a fitting in the pillow.
Fuel injection system
The engine is provided with one fuel injection pump
unit, an injection valve, and a high pressure pipe for
each cylinder.
The injection pump unit is mounted on the engine
frame. The pump unit consists of a pump housing
embracing a roller guide, a centrally placed pump
barrel and a plunger. The pump is activated by the
fuel cam, and the volume injected is controlled by
turning the plunger.
The fuel injection valve is located in a valve sleeve in
the centre of the cylinder head. The opening of the
valve is controlled by the fuel oil pressure, and the
valve is closed by a spring.
The high pressure pipe which is led through a bore
in the cylinder head is surrounded by a shielding
tube.
The shielding tube also acts as a drain channel in
order to ensure any leakage from the fuel valve and
the high pressure pipe will be drained off.
The complete injection equipment including injec-
tion pumps and high pressure pipes is well
enclosed behind removable covers.
Piston
The piston, which is oil-cooled and of the compo-
site type, has a body made of nodular cast iron and
a crown made of forged deformation resistant steel.
It is fitted with 2 compression rings and 1 oil scraper
ring in hardened ring grooves.
Figure 4: Piston
By the use of compression rings with different bar-
relshaped profiles and chrome-plated running surfa-
ces, the piston ring pack is optimized for maximum
sealing effect and minimum wear rate.
The piston has a cooling oil space close to the pis-
ton crown and the piston ring zone. The heat trans-
fer, and thus the cooling effect, is based on the
shaker effect arising during the piston movement.
The cooling medium is oil from the engine's lubri-
cating oil system.
Oil is supplied to the cooling oil space through
channels from the oil grooves in the piston pin
bosses. Oil is drained from the cooling oil space
through ducts situated diametrically to the inlet
channels.
The piston pin is fully floating and kept in position in
the axial direction by two circlips.
Connecting rod
The connecting rod is of the marine head type.
The joint is above the connecting rod bearing. This
means that the big-end bearing must not be
opened when pulling the piston. This is of advant-
age for the operational safety (no positional
changes/no new adaption), and this solution also
reduces the height dimension required for piston
assembly / removal.
Connecting rod and bearing body consist of CrMo
steel. They are die-forged products.
The bearing shells are identical to those of the
crankshaft bearing. Thin-walled bearing shells hav-
ing an AISn running layer are used.
MAN Diesel & Turbo
1689477-8.1
Page 3 (7)
General description
B 10 01 1
L27/38S, L27/38
2015.11.26
Summary of Contents for L23/30DF
Page 1: ...L27 38S Project Guide Power Plant Four stroke GenSet...
Page 2: ......
Page 8: ......
Page 9: ...MAN Diesel Turbo I 00 Introduction Page 1 1 I 00 Introduction 2018 04 13 en...
Page 10: ......
Page 14: ......
Page 16: ......
Page 20: ......
Page 31: ...MAN Diesel Turbo D 10 General information Page 1 1 D 10 General information 2018 04 13 en...
Page 32: ......
Page 40: ......
Page 42: ......
Page 46: ......
Page 48: ......
Page 50: ......
Page 59: ...MAN Diesel Turbo B 10 Basic diesel engine Page 1 1 B 10 Basic diesel engine 2018 04 13 en...
Page 60: ......
Page 68: ......
Page 70: ......
Page 72: ......
Page 74: ......
Page 76: ......
Page 82: ......
Page 84: ......
Page 85: ...MAN Diesel Turbo B 11 Fuel oil system Page 1 1 B 11 Fuel oil system 2018 04 13 en...
Page 86: ......
Page 104: ......
Page 114: ......
Page 118: ......
Page 126: ......
Page 128: ......
Page 130: ......
Page 134: ......
Page 138: ......
Page 142: ......
Page 173: ...MAN Diesel Turbo B 13 Cooling water system Page 1 1 B 13 Cooling water system 2018 04 13 en...
Page 186: ......
Page 192: ......
Page 198: ......
Page 202: ......
Page 204: ......
Page 207: ...MAN Diesel Turbo B 14 Compressed air system Page 1 1 B 14 Compressed air system 2018 04 13 en...
Page 210: ......
Page 216: ......
Page 217: ...MAN Diesel Turbo B 15 Combustion air system Page 1 1 B 15 Combustion air system 2018 04 13 en...
Page 218: ......
Page 224: ......
Page 226: ......
Page 227: ...MAN Diesel Turbo B 16 Exhaust gas system Page 1 1 B 16 Exhaust gas system 2018 04 13 en...
Page 228: ......
Page 252: ......
Page 256: ......
Page 269: ...MAN Diesel Turbo B 17 Speed control system Page 1 1 B 17 Speed control system 2018 04 13 en...
Page 270: ......
Page 272: ......
Page 282: ......
Page 284: ......
Page 286: ......
Page 293: ...ENGINE AUTOMATION MAN Diesel Turbo SE SaCoSone GENSET System description Revision 1 5...
Page 306: ...MAN Diesel Turbo SaCoSone GENSET SaCoSone GENSET Communication from GenSet Revision 1 7...
Page 309: ...MAN Diesel Turbo Table of Contents...
Page 324: ......
Page 326: ......
Page 327: ...MAN Diesel Turbo B 20 Foundation Page 1 1 B 20 Foundation 2018 04 13 en...
Page 328: ......
Page 334: ......
Page 335: ...MAN Diesel Turbo B 21 Test running Page 1 1 B 21 Test running 2018 04 13 en...
Page 336: ......
Page 341: ...MAN Diesel Turbo E 23 Spare parts Page 1 1 E 23 Spare parts 2018 04 13 en...
Page 342: ......
Page 348: ......
Page 350: ......
Page 351: ...MAN Diesel Turbo P 24 Tools Page 1 1 P 24 Tools 2018 04 13 en...
Page 379: ...MAN Diesel Turbo B 50 Alternator Page 1 1 B 50 Alternator 2018 04 13 en...
Page 380: ......
Page 386: ......
Page 390: ......
Page 392: ......