HYDRAULIC CONTROL UNIT, REMOVING AND INSTALLING, 0D3 "quattro sport" AND 0BX "quattro sport": Installing

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Fig 1: Hydraulic Control Unit

Courtesy of AUDI

Replace the seal between the hydraulic control unit -1- and the final drive housing.
The centering pins OVERVIEW - HYDRAULIC CONTROL UNIT 0D3 AND 0BX must be installed inside the housing for the hydraulic control unit.
The left -6- and right -7- lines must be installed loosely when attaching the hydraulic control unit -1-.
The bolt -2- must be installed with a seal.

First install the lines -6- and -7- into the chambers hand-tight -arrows B-.

Then install the bolts -3 to 5- hand-tight.

Coat the threads of the bolt -2- with Sealing Compound:D 176 501 A1 .

Install the bolt -2- with a seal.

Tighten the M8 x 30 screws -2 through 5- to the tightening specification in the sequence: -4-, -2-, -5- and -3-.

Tighten the nuts -A arrows- and -B arrows- on the left -6- and right -7- lines to the tightening specification.

-- Install the All-Wheel Drive Pump -V415-. Refer to Removing .

Fig 2: Identifying Rear Final Drive Wiring Harness Bracket

Courtesy of AUDI

-- Install the wiring harness -3- to the final drive and subframe -items 5 through 7-.

-- Connect the connectors -4- and -2-. Pay attention to the marks made during the removal, that identify the allocation to the Oil Pressure/Temperature Sensor -- and which connectors go to the Clutch Valves --.

-- If equipped, position the wiring harness bracket -1- on the rear final drive and tighten the bolts -arrows- to the tightening specification. Make sure the wiring harness -3- does not get pinched.

Allocation of the connectors for the Oil Pressure/Temperature Sensor -- and Clutch Valves -- :

Fig 3: Identifying Oil Pressure/Temperature Sensor Connectors

Courtesy of AUDI

-1- = Oil Pressure/Temperature Sensor 2 -G640- Connector
-2- = Oil Pressure/Temperature Sensor -G437- Connector
-3- = All-Wheel Drive Clutch Valve 2 -N446- Connector
-4- = All-Wheel Drive Clutch Valve -N445- Connector

-- Fill the rear final drive with gear oil and then check the level. Refer to GEAR OIL LEVEL, CHECKING, 0D3 "quattro sport" AND 0BX "quattro sport" .

-- Fill the ATF in the rear final drive and check the ATF level. Refer to ATF LEVEL, CHECKING .

-- Install the rear section of the exhaust system and align it so it is free of tension. Refer to .