SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 58
Fitting the PDE injector
PDE Injectors
Specifications
Tightening torques:
Lock nut on rocker arm 39 Nm
Bolt for fork on unit injector. 20 Nm + 75°
Bearing bracket and rocker arm shaft 105 Nm
Screws for cable connections on unit injector 2 +/- 0.2 Nm
Special tools
Number Description Illustration
512562 Torque screwdriver
Each unit injector consists of a pump element, a solenoid valve
and a nozzle. In this way, it is possible to control the fuel injection
for each individual cylinder.
EMS (Engine Management System) is the electronic system that
controls both how much fuel each unit injector should inject into
the cylinder and also when the unit injector should inject the fuel.
This control of the injection means that we can optimise the com-
bustion, which in turn leads to cleaner exhaust gases.
The control unit is the brain of the EMS system. The control unit
processes the information both from the sensors and the compo-
nents that are part of the EMS system and also from the control
units in other systems.
When the control unit has processed the information, it then trans-
mits signals to the unit injectors.
The signals control the injection of the fuel.
The EMS system makes possible such functions as for example a
special cold start programme.
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