Audi Workshop Service and Repair Manuals

Removing and installing four-wheel drive control unit -J492- Special tools and workshop equipment required t  Allen key (4 mm)

t  Torque wrench (2 ... 10 Nm) -V.A.G 1783-

t  Drip tray for workshop hoist -VAS 6208- –  Switch off ignition.

–  Unplug connectors -1- and -2- at top of control unit. –  Position drip tray under final drive.   Note It is advisable to have a workshop trolley with tools and cleaning cloths within easy reach so that removed parts can be put down safely.

–  Remove bolts -arrows-. –  Carefully detach control unit -A-.

–  If necessary, detach cover → Item from housing of Haldex coupling, while keeping hold of valve -arrow-. –  Place a cloth over coupling opening control valve -N373--arrow-, take hold of valve body with pliers and pull out valve. Installing Installation is carried out in reverse sequence; note the following:   Note

The seals for the valve have different internal diameters. t  -1- Internal diameter: 10 mm t  -2- Internal diameter: 11 mm t  -3- Internal diameter: 12 mm t  -4- Seal on valve body

–  First lubricate seal -1- with Haldex oil and fit seal onto coupling opening control valve -N373-. –  Then fit seals -2-, -3- and -4-. –  Press centring lips (4x) of seal -4- into groove.

–  Fit new cover -2- onto control unit -1-.   Note The cover can only be fitted in one position.

–  Insert coupling opening control valve -N373--3- in control unit -1-.   Note The valve can only be fitted in one position.

–  Carefully fit control unit -A- and tighten bolts -arrows- to torque → Item. –  Check oil level in Haldex coupling → Chapter.