1997 — 2002
4.0L Supercharged AJ26/AJ27 V8 - Performance Saloon
Petrol
Check the transmission during light acceleration | Observation: With the Mercedes-sourced 722.6 gearbox, it's worth feeling for any reluctance in gear changes, as these units can occasionally exhibit signs of wear in the valve body or electrical connector leaks.
Listen carefully during cold start-up | Observation: Pay attention for any rattling sounds from the top of the engine during the first few seconds, as the timing chain tensioners in the AJ26/27 V8s are a known point of consideration for these high-performance units.
Evaluate the suspension over uneven road surfaces | Observation: These saloons are heavy, and the bushes and ball joints take a fair amount of load; listen for any 'clunking' noises that might suggest the suspension components are nearing the end of their current lifecycle.
Test the auxiliary cooling system while idling | Observation: Ensure the temperature gauge remains steady; if the needle wanders, it might be worth investigating the state of the cooling system, including the plastic housing components that can become brittle with age.
Usually marks the time to review the condition of the supercharger drive belt and idler pulleys.
Common period to evaluate the integrity of the cooling system hoses and the primary timing chain tensioners if not already updated.
A point where a comprehensive refresh of the suspension bushes and dampers can significantly restore the 'Jaguar magic'.
Check the engine oil colour and level regularly to ensure the supercharger internals are well-lubricated.
Verify the service history specifically for evidence of transmission fluid changes, as 'sealed for life' often benefits from a refresh.
Keep an eye on the coolant expansion tank for any signs of cracking or leakage.
Ensure all electrical accessories are cycled, as the X308 has many modules that appreciate regular use.
Inspect the tyre tread for even wear to confirm the wheel alignment is within spec.
Estimated repair costs if issues arise
If the original plastic-bodied tensioners are still in place, you might eventually need to budget for an upgrade to the later metal-bodied units to provide peace of mind for the long-term.
If this component needs attention in the future, the estimated cost in NZ is reflective of the specialised nature of the Eaton unit, involving a potential overhaul of the bearings and fluid coupling.
Depending on the car's history, you might eventually need to budget for a gearbox service or a refresh of the electrical pilot bush if you notice any erratic shifting patterns.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer