Assembly overview: Power steering/fluid circuit for 6-cylinder, 5-valve petrol engine — AUDI

General information

Servicing of vane pump is not envisaged. In the case of complaints, determine the cause by means of a pressure test and leak test. If a fault is detected, replace the vane pump.

With the exception of the routing of the hydraulic system pipes from left to right on the steering box, the fluid circuit of RHD vehicles corresponds to that of the LHD version.

Notes:

Check steering system for leaks if there is a lack of fluid in the reservoir.
If a leak is found in the area of the pipe connections, first check pipes/pipe connections for leaks, re-tighten if necessary and wipe dry.
Replacement pumps are not filled with fluid. Prior to installation these must always be filled with hydraulic fluid G 002 000 and cranked by hand to avoid possible noise whilst driving or pump damage.
Type of fluid: Hydraulic fluid G 002 000

When fluid circuit has been opened always:

Check all unions for leaks, start engine and perform visual inspections.
Check fluid level =>Page
48-144

Power-assisted steering box
Assembly overview:

Left-hand drive => Page
48-35
Right-hand drive => Page
48-114

Servicing => Page
48-109

Return hose
Steering box - hydraulic fluid cooler

Retaining clip
Attach expansion hose (=> Item
28
)

Hexagon nut, 20 Nm
Water pipe

Cap with dipstick
Strainer for expansion tank
Clean using solvent

Expansion tank
Refilling with hydraulic fluid, Part No. G 002 000, filling quantity 1.2 litres
Plugged into hydraulic unit bracket
Check fluid level =>Page
48-144

Support panel for suspension strut holder

Note:

Items 10 and 11 are located in the left wheel housing and accessible from outside with vehicle raised.

Hexagon nut 5.6 Nm
Bonded rubber bush

Clip
Always replace
Tensioning => Page 48-113
Can also be replaced by screw-type hose clamp

Return hose
Fluid cooler - expansion tank

Suction hose
Pipes - expansion tank

Clip
Always replace
Tensioning => Page 48-113
Can also be replaced by screw-type hose clamp

Combi bolt, 10 Nm
Hydraulic fluid cooler
Pipe for suction hose
Clip
Always replace
Tensioning => Page 48-113
Can also be replaced by screw-type hose clamp

Suction hose
Note marking -P- for hose connection at pump end.

Screw fitting, 50 Nm
Sealing ring
Always replace

Vane pump
Check delivery pressure => Page
48-175
Removing and installing=>Page
48-183
Before installing, fill with hydraulic fluid at suction end and crank by hand until fluid emerges at pump outlet.

Sealing ring
Always replace

Expansion hose
Section with pipe, runs to steering box

Banjo bolt, 47 Nm
Hexagon bolt, 6 Nm

Expansion hose
Tighten union nut to 40 Nm at Item
25
; counterhold at hexagon for this purpose.
Attach to fastening bracket (=>Item
3
)

Hexagon bolt, 10 Nm
Guard plate
Only for LHD
Clip into steering damper using spring clamp.

Note:

This guard plate is also installed on the V8 engine.