Turbocharger - Komatsu 114E-3 Series Shop Manual

SEN00176-02

Turbocharger

General Information
1. Exhaust in
2. Sliding nozzle open
3. Exhaust gas low velocity flow
The turbocharger uses exhaust gas energy to turn
the turbine wheel. The turbine wheel drives the
compressor impeller that provides pressurized air
to the engine for combustion. The additional air pro-
vided by the turbocharger allows more fuel to be
injected to increase the power output from the
engine.
The turbine, compressor wheels, and shaft are sup-
ported by two rotating bearings in the bearing hous-
ing. Passages in the bearing housing direct filtered,
pressurized engine oil to the shaft bearings and
thrust bearings. The oil is used to lubricate and cool
the rotating components. Oil then drains from the
bearing housing to the engine sump, through the oil
drain line.
a An adequate supply of good, filtered oil is very
important to the life of the turbocharger. Make
sure that a high-quality oil is used and that it
and the oil filter are changed according to
maintenance recommendations.
4
10 Structure, function and maintenance standard
1
Variable geometry turbocharger
4.
5.
Sliding nozzle closed
Exhaust gas high velocity flow
114E-3 Series