PowerTech 6105HF - How the Turbocharger Is Lubricated; Turbocharger Operation

Base Engine Operation
03
120
13
RG,RG34710,1523 –19–30SEP97–1/1
Turbocharger Operation
RG9098 –UN–27MAR98
Turbocharger Components
A—Shaft
B—Turbine Housing
C—Turbine Wheel
D—Center Housing
E—Compressor Wheel
F—Compressor Housing
The turbocharger, which is basically an air pump that is
driven by exhaust gases, allows the engine to produce
added power without increasing displacement.
Turbochargers are specially matched for the power ratio
requirements of each specific application.
The turbine wheel (C) is driven by the hot engine exhaust
gases. These gases flowing through the turbine housing
(B) act on the turbine wheel causing shaft (A) to turn.
Compressor wheel (E) brings in filtered air and discharges
the compressed air into the intake manifold where it is
then delivered to engine cylinders.
Engine oil under pressure from the engine lubrication
system is forced through passages in center housing (D)
to bearings.
RG,RG34710,1524 –19–30SEP97–1/1
How the Turbocharger is Lubricated
RG8099 –UN–18NOV97
Turbocharger Lubrication
A—Pressure Oil
B—Discharge Oil
Engine oil under pressure from the engine lubrication
system is pumped through a passage in the bearing
housing and directed to the bearings, thrust plate, and
thrust sleeve. Oil is sealed from the compressor and
turbine by a piston ring at both ends of the bearing
housing.
The turbocharger contains two floating bearings. These
bearings have clearance between the bearing OD and the
housing bore as well as clearance between the bearing ID
and the shaft OD. These clearances are lubricated by the
oil supply (A) and the bearings are protected by a cushion
of oil. Discharge oil (B) drains by gravity from the bearing
housing to the engine crankcase.
CTM100 (06APR04) 03-120-13 P OWER T ECH 10.5 L & 12.5 L Diesel Engines
040604
PN=345