Ford 6.4L Power Stroke, Manual

Page: 37 / 103

36
63
AIR MAnAgeMent SySteM
64
65
Series Sequential Turbocharger
& Turbocharger Actuator
• The series sequential turbocharger for the 6.4L Power
Stroke
®
Diesel is designed to provide boost control at
low and high speeds for improved throttle response.
• The turbocharger actuator is used to control the
position of the variable vanes inside the high
pressure turbocharger’s turbine housing.
• When the vanes of the turbocharger are closed, the
engine will have a higher exhaust back pressure
and create more heat which will in turn warm
the engine faster in cold ambient conditions.
NOTE: There is an oxidation catalyst in the exhaust
pipe for the EGR system that is utilized to crack
hydrocarbons before they enter the EGR system.
Turbocharger Actuator
• The variable vanes inside the high pressure
turbocharger’s turbine housing are now
controlled by the turbocharger actuator.
• The high pressure turbocharger’s turbine housing
contains vanes that control the effective size of
the housing. These vanes are controlled by the
turbocharger actuator by way of a control arm. The
control arm connects the actuator to a pivot shaft which
connects to the unison ring that moves the vanes.
Turbocharger
Actuator
Control Arm
Turbocharger Actuator Cooler
• The turbocharger actuator is fitted with a
cooling plate to reduce the temperature of the
electronics inside the actuator housing.
• The actuator cooler uses coolant from the fuel
system cooler as the heat exchange medium.
Turbocharger
Actuator
Turbocharger
Actuator Cooler
Low Pressure
Turbocharger
High Pressure
Turbocharger
Oxidation Catalyst