Kubota D1803-CR-E4 User Manual

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) Turbine wheel
(5) Turbine housing
(6) Wastegate valve
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-
sure
2 mm point
88.9 kPa
0.907 kgf/cm
2
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
(A) Running wind
(B) Intake air
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 Air cooled
MECHANISM
4. Intake and exhaust system 4. ENGINE
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
4-41
KiSC issued 12, 2018 A

Kubota D1803-CR-E4 Specifications

General

Brand	Kubota
Model	D1803-CR-E4
Category	Engine
Language	English