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The intake air system of this engine is optimized by VGT and a highly efficient intercooler system.
The pressure of the air system is up to about abs. 2.5 bar in order to optimize engine combustion.
Glow
plug
Coolant
temperature
sensor
ENGINE ROOM VENTILATION
• Engines with turbocharged air inlet systems require much more cool fresh air than non-
turbocharged engines.
(Maximum air consumption is 460kg/h, minimum engine room vent area is 35cm2.)
• The fresh and cooled air must be pumped into the engine in order to perform at normal
power and fuel consumption.
• The temperature at the air inlet should be as low as possible. A high temperature of inlet air
may reduce engine performance.
INSTALLATION & OPERATION MANUAL
U125 Series Engines
CHAPTER 5
AIR INTAKE SYSTEM
Cam Position
Sensor
Crankshaft
position
sensor
Air
filter
Boost pressure &
air temp. sensor
Intercooler
VGT actuator
Vacuum
modulator
-31-
VGT
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