Bomag BW 156 D-3 Service Manual page 40

The crankshaft is made of forged steel and has inductively hardened transition radii at the bearing
journals. The crankshaft is designed for considerably higher loads.
Due to the use of modern design methods the number of individual engine elements could be
considerably reduced. The relatively low number of parts per engine results in a lower problem
frequency and therefore a higher reliability. Apart from that, the expenses for the storage of spare parts
and maintenance activities can be reduced. In most cases O-rings are used as seals.
The water pump is a plug-type unit, which is installed at the front end of the cylinder block.
The lubrication oil pump is installed in the cylinder block in a similar way. It delivers the engine oil from
the oil sump to the individual lubrication points.
Excellent emission values and high availability of engine power are achieved by the following features:
• wet cylinder liners installed and support at half stroke height for noise reduction and avoidance of
cavitation,
• pendulum shaft pistons for high durability and long lifetime,
• improved piston cooling to prolong the lifetime and reduce the oil consumption,
• lubrication oil temperature control to assure immediate oil supply during starting and to maintain the
optimal operating temperature during operation,
• lubrication oil system components avoiding the complete drainage of the lubrication oil circuit after
stopping the engine, thereby assuring quick increase of oil pressure during starting,
• excellent lubrication oil filtration with main flow filter for the protection of moving engine components.
BW 156/177 D-3/PD-3
BW 178/179 D-3/PD-3
Service Training
- C 2 -