The Jaguar AJD6 is a 2,720 cc, inline-six turbo-diesel engine produced between 2004 and 2013. It was developed as a refined, high-torque powerplant for Jaguar's luxury sedan and grand tourer lineup, featuring common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard tune it delivered 130 kW (177 PS), with peak torque of 400 Nm, enabling strong linear acceleration and relaxed cruising performance.
Fitted to models such as the XJ, XF, and S-Type, the AJD6 was engineered for smooth, quiet operation with strong low-end torque and minimal vibration. Emissions compliance was achieved through exhaust gas recirculation (EGR), diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, allowing all units to meet Euro 4 standards during its production run.
One documented concern is premature high-pressure fuel pump (HPFP) wear, highlighted in Jaguar Service Information Bulletin JAG-SIB-19-10. This issue is linked to fuel quality sensitivity and extended service intervals beyond OEM recommendations. From 2008, Jaguar introduced revised pump calibration and updated fuel filter specifications to improve durability.
Jaguar
All production years (2004–2013) meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Jaguar AJD6 is a 2,720 cc inline-six turbo-diesel engine engineered for premium applications (2004–2013). It combines common-rail injection with variable geometry turbocharging to deliver responsive torque and efficient cruising. Designed to meet Euro 4 emissions standards, it balances performance with environmental compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,720 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-6, DOHC, 24-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 85.0 mm × 80.0 mm | |
| Power output | 130 kW (177 PS) @ 4,000 rpm | |
| Torque | 400 Nm @ 1,800–2,500 rpm | |
| Fuel system | Bosch CRS 2.0 common-rail (up to 1,600 bar) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 17.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Garrett GT1749V) | |
| Timing system | Chain-driven (front-mounted, dual-row) | |
| Oil type | Jaguar Specification WSS-M2C913-C (5W-30) | |
| Dry weight | 198 kg |
The VGT turbo provides strong low-RPM torque ideal for urban driving but requires strict adherence to 15,000 km oil change intervals to prevent turbo and HPFP degradation. Jaguar WSS-M2C913-C (5W-30) oil is critical due to its thermal stability and protection for high-pressure injection components. Extended idling or short-trip driving may accelerate carbon buildup on intake valves. The Bosch CRS 2.0 fuel pump demands ultra-low-sulfur diesel (ULSD) meeting EN 590 standards to prevent injector clogging and pump wear. Post-2008 models feature revised fuel calibration; pre-2006 units should have updated filter and pump per Jaguar SIB JAG-SIB-19-10. Regular DPF and SCR system monitoring is advised to maintain emissions compliance.
Oil Specs: Requires Jaguar WSS-M2C913-C (5W-30) specification (Jaguar SIB JAG-OS-09-12). Replaces ACEA B4.
Emissions: Euro 4 certification applies to all 2004–2013 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Full output requires EN 590 diesel (Jaguar TIS Doc. A27010).
Jaguar Technical Information System (TIS): Docs A27001, A27002, A27004, SIB JAG-SIB-19-10
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Jaguar AJD6 was used across Jaguar's XJ/XF/S-Type platforms with longitudinal mounting and no licensed external usage. This engine received platform-specific adaptations-reinforced engine mounts in the XJ and revised intake manifolds in the XF-and from 2008 the updated XF facelift adopted revised fuel pump calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right-side cylinder block near the oil filter housing (Jaguar TIS A27050). The 8th VIN digit indicates engine type ('D' for AJD6 series). Pre-2008 models have silver valve covers with black plastic timing covers; post-2008 units use gloss black valve covers. Critical differentiation from AJ-V6: AJD6 features Bosch CRS 2.0 injection and lacks supercharger. Service parts require production date verification—fuel pumps before 06/2006 are incompatible with later revisions due to internal design changes (Jaguar SIB JAG-SIB-19-10).
The AJD6's primary reliability risk is high-pressure fuel pump degradation, with elevated incidence in mixed urban/highway use. Internal Jaguar quality reports from 2009 noted a significant share of pre-2006 engines requiring pump replacement before 100,000 km, while UK DVSA records link a portion of emissions-related MOT failures to lean fuel trim codes in city-driven examples. Short-trip driving and low-quality fuel increase injector and pump stress, making fuel quality and interval adherence critical.
Analysis derived from Jaguar technical bulletins (2006-2013) and UK DVSA failure statistics (2008-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about JAGUAR AJD6.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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