TM 5-3805-280-24-2
Air Intake and Exhaust System Operation and Tests
TURBOCHARGER OPERATION
110
11
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.
A--Shaft
B--Turbine Housing
Engine oil under pressure from the engine lubrication
C--Turbine Wheel
system is forced through passages in center housing (D)
D--Center Housing
to bearings.
E--Compressor Wheel
F--Compressor Housing
RG,110,JW7669 1924NOV971/1
HOW THE TURBOCHARGER IS LUBRICATED
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
A--Pressure Oil
oil supply (A) and the bearings are protected by a cushion
B--Discharge Oil
of oil. Discharge oil (B) drains by gravity from the bearing
housing to the engine crankcase.
RG,110,JW7668 1924NOV971/1
13-517
