Structure Of Turbocharger; Function Of Turbocharger; Specification Of Turbocharger; Intercooler - Kubota D1803-CR-E4 Workshop Manual

MECHANISM
4. Intake and exhaust system

4.7.2 Structure of turbocharger

The turbocharger is made up of a compressor wheel
and turbine wheel.
(1) Wastegate actuator
(2) Compressor wheel
(3) Compressor housing

4.7.3 Function of turbocharger

The turbocharger uses the exhaust gas to compress
intake air.
When combustion gases pass through the turbocharger
they cause the turbine wheel to rotate at high speeds.
This rotation causes the compressor wheel mounted on
the same shaft to rotate at high speeds compressing
intake air and supplying this to each cylinder.
Furthermore, when intake air pressure rises too high,
the wastegate actuator opens the wastegate valve via a
rod allowing a part of the exhaust gases to flow directly
to the muffler without passing over the turbine wheel.
Therefore, intake air pressure is kept constant.

4.7.4 Specification of turbocharger

Actuator set pres-
2 mm point
sure
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
(4) Turbine wheel
(5) Turbine housing
(6) Wastegate valve
88.9 kPa
2
0.907 kgf/cm
12.9 psi

4.8 Intercooler

4.8.1 Outline of intercooler

The intercooler uses outdoor air temperature to cool air
compressed in the turbocharger whose temperature
has risen.

4.8.2 Structure of intercooler

The intercooler is made up of a core (inner fins) and
heat dissipating fins.
(1) Core
(2) Inner fin
(3) Radiating fine

4.8.3 Function of intercooler

Intake air is compressed and its temperature rises as it
passes through the turbocharger.
The intercooler is designed to contact outside air
passed through or from the cooling fan and cools the
high temperature intake air utilizing this outside air
increasing the intake air density.

4.8.4 Specification of intercooler

Cooling method
4. ENGINE
(A) Running wind
(B) Intake air
Air cooled
4-41
KiSC issued 12, 2018 A