Audi Workshop Service and Repair Manuals

Vehicles with 8-cylinder petrol engine (versions with timing chain)

Special tools and workshop equipment required

t	Hose clamp -3094-

t	Power steering tester -V.A.G 1402-

t	Adapter -V.A.G 1402/2-

t	Hose from adapter set -V.A.G 1402/6- (2x)

t  Drip tray for workshop hoist -VAS 6208- Test requirements: l  Belt condition/ belt tension OK l  No leaks in system l  Hoses and pipes not kinked or constricted

Checking –  Clamp off suction and return hoses using hose clamps up to 25 mm Ø -3094-. –  Remove noise insulation → Rep. Gr.50.

The pressure hose is not detached at the power steering pump when checking delivery pressure. Power steering tester -V.A.G 1402- is connected to pipe -arrow- at bottom of engine compartment (left-side). –  Place drip tray for workshop hoist -VAS 6208- under the union to catch escaping hydraulic fluid. –  Disconnect pipe connection -arrow-.

–  Connect power steering tester -V.A.G 1402- as shown. 1 -  Pressure hose 2 -  Pressure gauge -V.A.G 1402- 3 -  Hose from adapter set -V.A.G 1402/6- 4 -  Hose from adapter set -V.A.G 1402/6- 5 -  Pressure hose 6 -  Adapter -V.A.G 1402/4- –  Screw hose from power steering tester -V.A.G 1402- onto pressure hose. –  Remove hose clamps up to 25 mm Ø -3094-.

–  Make sure lever on pressure gauge is in position -2-. –  Start engine but do not press accelerator. –  Turn steering wheel approx. 10 times from lock to lock. –  Switch off engine and top up hydraulic fluid in reservoir if necessary.   Note t  To avoid damaging the power steering pump, please note the following points: t  Cut-off valve of pressure gauge must not remain closed for more than 10 seconds during this test. t  Start engine without pressing accelerator and leave it running at idling speed. t  Take pump pressure reading at idling speed immediately after starting engine (have second mechanic take reading). t  The pressure will drop during the test; take the highest pressure reading as the test value. –  Then check delivery pressure.

–  Start engine, close cut-off valve (position -1-) with engine idling and read off pressure (lever must face away from pressure hose). Do not perform measurement for longer than 10 seconds. Delivery pressure specification: 123…130 bar Renew power steering pump if specification is not attained → Chapter. –  Switch off engine. –  Remove power steering tester -V.A.G 1402-. –  Connect union on pressure hoses: 40 Nm. –  Check hydraulic fluid level → Chapter. –  Check steering system for leaks → Chapter. –  Bleed steering system → Chapter. –  Fit noise insulation → Rep. Gr.50.