Ribbed belt drive for vane pump, alternator and viscous fan — AUDI
Ribbed belt drive for vane pump, alternator and viscous fan on Audi: factory workshop procedure for engines AAN, AAR, AAS, AAT.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.
ABP AEL
Note:
Mark the running direction with chalk or felt pen before removing the ribbed belt. If the belt runs in the opposite direction when it is refitted, this can cause breakage.
Fan wheel
For viscous fan
"FRONT" marked on outer race must point in direction of travel
Removing and installing =>Page
19-20
Viscous coupling
Switching temperature: 72...80°C ambient temperature at the viscous coupling
Checking => Page
19-23
Removing and installing =>Page
19-20
Ribbed belt
Check for wear
Do not kink
Removing and installing =>Page
13-8
Routing of ribbed belt=>Fig.
13-7
Ribbed belt on vehicles with air conditioner=>Fig.
13-7
20 Nm
To release and pick up pulley counterhold with oil filter strap wrench if necessary.
Hexagon flange
For turning the engine by hand using wrench 32 A/F
Tensioner for ribbed belt
Swivel with open-ended spanner to slacken ribbed belt => Page
13-8
Secure in position with mandrel 3204
Belt pulley
For vane pump
20 Nm
Bracket
For vane pump
20 Nm
Vane pump
For power steering
Removing and installing:
=> FWD and 4WD Running Gear; Repair group 48; Exploded view: Vane pumps
FWD and 4WD Running Gear
Exploded view: Vane pumps
20 Nm
Bracket
For alternator
45 Nm
Alternator
Removing:
Disconnect battery earth strap
Removing ribbed belt =>Page
13-8
Disconnect wiring from alternator
Unplug connector, lay the wiring aside.
Unscrew bolts from top and bottom from bracket.
Remove alternator
To facilitate attachment of the alternator drive back bush for lower securing bolt slightly at bracket
45 Nm
Mounting
For viscous fan
Check for ease of movement
Removing and installing =>Page
19-20
10 Nm
Vibration damper
Assembly on the sprocket/crankshaft only possible in one position: The lug on the sprocket must engage in the bore of the belt pulley
Removing and installing=>Page
13-12
20 Nm
Central bolt
Replace
Coat thread and contact surface of bolt head with sealing paste
Sealing paste
=> Parts List
Counter hold with 3256 to loosen and tighten
Tightening torque 200 Nm + 270°(3/4 turn)
Removing and installing=>Page
13-12
Belt pulley
For viscous fan
Removing and installing =>Page
19-20
10 Nm
Fig.1
Ribbed belt routing on vehicles without air conditioner
Fig.2
Ribbed belt routing on vehicles with air conditioner
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.