Assembly overview - part I, belt drive — VW
Assembly overview - part I, belt drive on VW: factory workshop procedure for engines AHW, AKQ, APE, ATN. Full factory text, tools and checks.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📐 25 workshop diagrams for AHW
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.
Assembly overview - part I, belt drive
Toothed belt guard upper part
20 Nm +
1
/
4
turn (90°) further
Renew.
Use
camshaft lock
T10016
to loosen and tighten.
Camshaft pulley
Note position when installing toothed belt
Chapter
, removing, installing and tensioning toothed belt.
Coupling drive tensioning roller
Checking
Chapter
Tensioning toothed belts
Chapter
.
Coupling drive toothed belt
Mark direction of rotation before removing.
Check for wear.
Do not kink.
Removing, installing and tensioning
Chapter
.
Bracket
Only installed for engine code BCA
10 Nm
Coolant pump
If damaged or leaking, renew complete.
Removing and installing
Chapter
Rear toothed belt guard
20 Nm
50 Nm
Main drive toothed belt idler roller
Main drive tensioning roller
Checking
Chapter
Tensioning toothed belts
Chapter
.
Crankshaft toothed belt pulley
Note position when installing toothed belt
Chapter
, removing, installing and tensioning toothed belt.
Main drive toothed belt
Mark direction of rotation before removing.
Check for wear.
Do not kink.
Toothed belt routing
Fig.
.
Removing, installing and tensioning
Chapter
.
12 Nm
Renew.
Poly V-belt pulley
When installing note fixing arrangement.
Removing and installing
Chapter
; Removing, installing and tensioning toothed belt
Securing bolt
Observe tightening procedure
Chapter
.
Renew.
Contact surface for securing bolt must be free of oil and grease.
Oil threads before inserting.
Secure poly V-belt pulley against turning with
counterhold
3415
Turning further can be done in several stages.
The turning further angle can be checked using a commercial protractor e.g. Hazet 6690.
Poly V-belt
Mark direction of rotation with chalk or felt pen before removing.
Check for wear.
Do not kink.
Removing and installing
Chapter
Poly V-belt routing
Chapter
.
Toothed belt guard lower part
Engine bracket
50 Nm
Renew.
25 Nm
Only installed for engine code BCA
Idler roller
Only installed for engine code BCA
Toothed belt routing
Coupling drive toothed belt
A
Main drive toothed belt
B
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.