Ford Focus RS 2016 Technical Service Training page 60

Four-Wheel Drive Systems
E220578
The rear drive unit stores fluid in three separate
chambers.
• Rear drive unit differential housing
• Left clutch pack housing
• Right clutch pack housing
The rear drive unit differential housing is filled with
Hypoid oil Ford 75W 85 plus 5% Lubrizol FM6179 to
lubricate the differential and to actuate the multi plate
clutch packs.
58
Lesson 3 – Powertrain
NOTE: The clutch pack hydraulic fluid can not be
replaced.
The clutches are wet-running multi-plate clutches with
a carbon lining and are immersed in Pentison CMF11S
275 ml hydraulic fluid. Carbon is used on the clutches
as it has the best properties in terms of power density
and NVH (noise, vibration and harshness) performance.
Modulation of the multi-plate clutch locking torque is
performed by means of a hydraulic pressure that acts
directly on the plate assembly via a piston.
Service Training