Auxiliary belt replacement: Jaguar XJ X308 4.0 SC V8 Drive (AJ26)
Step-by-step auxiliary belt replacement for the Jaguar XJ X308 4.0 SC V8 Drive (AJ26): 38 steps. What to remove, in what order, and what to check after.
Workshop procedure for JAGUAR — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: platform codes V8, 4.0, R
- Renewed: ancillary drive belt
🔧 Engine codes this applies to
📋 Procedure
Preparation and removal
- Remove the radiator fan
- Check the drive belt tension
- New belt minimum length
- New belt maximum length
- Renew the ancillary drive belt if the mark is at:
- Turn the tensioner clockwise
- Remove the supercharger drive belt
- Note: Release the tensioner slowly
- Remove the idler pulley
- Remove the tensioner
- Ancillary drive belt:
Installation and checks
- Turn the tensioner anti-clockwise
- Fit the ancillary drive belt
- Note: Release the tensioner slowly
- Renew the ancillary drive belt if the mark is at:
- Supercharger drive belt:
- Refit the tensioner
- Refit the idler pulley
- Turn the tensioner clockwise
- Refit the supercharger drive belt
- Note: Release the tensioner slowly
- Refit the radiator fan
Other JAGUAR procedures
- Jaguar AJ26 timing chain replacement
- XJ X308 3.2 NA/4.0 NA - V8 AJ26 Drive belt
- XF 2.2D timing belt
- Jaguar S-Type X200 2.7 D 7B/7G timing belt replacement
- Jaguar S-Type X200 2.7 D 7B/7G timing belt replacement
- Jaguar XF, XJ X250, X350 2.7 D 7G timing belt replacement
- Jaguar S-Type 4.2 S, C R drive 1B auxiliary belt replacement
- Jaguar GB/GC auxiliary belt replacement
- S-Type V6 petrol drive belt removal/istallation
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.