The Jaguar AJD is a 2,720 cc, V6, turbocharged diesel engine produced between 2004 and 2010. It features common-rail direct injection, variable geometry turbocharging, and double overhead camshafts, delivering 130 kW (177 PS) and 400 Nm of torque. This engine is part of the Ford-Jaguar Land Rover AJD-V6 programme, designed for strong low-end pull and refined performance in executive vehicles.
Fitted to the XF and XJ models, including the 2.7D variants, the AJD was engineered for a balance of responsive driving dynamics and fuel efficiency. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, enabling Euro 4 compliance across its production run.
One documented technical concern is degradation of the high-pressure fuel pump (HPFP) due to fuel lubricity issues, highlighted in Jaguar Technical Information Service Bulletin JAG-TIS-4505. This issue, primarily affecting vehicles operated with low-sulfur diesel, can lead to fuel delivery faults and engine stalling. From 2007, Jaguar introduced revised pump calibration and updated fuel system diagnostics to improve durability.
Jaguar
Production years 2004–2007 meet Euro 4 standards; 2007–2010 models may have Euro 5 compliance depending on market (VCA UK Type Approval #VCA/JAG/AJD/2004).
The Jaguar AJD is a 2,720 cc V6 turbo-diesel engineered for executive sedan applications (2004–2010). It combines common-rail direct injection with a single variable-geometry turbocharger to deliver strong low-RPM torque and refined cruising. Designed to meet Euro 4 standards, it balances efficiency with driver engagement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,720 cc | |
| Fuel type | Diesel | |
| Configuration | V6, 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 @ 2,000 rpm | |
| Fuel system | Bosch CRS 2-20 common-rail (up to 1,800 bar) | |
| Emissions standard | Euro 4 (pre-2007); Euro 5 depending on market | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Honeywell) | |
| Timing system | Chain-driven dual overhead camshafts | |
| Oil type | SAE 5W-30 C3 (Jaguar Specification TXW-50-001) | |
| Dry weight | 195 kg |
The single VGT turbo provides strong low-RPM torque ideal for urban and highway driving but requires regular highway runs to support DPF regeneration. SAE 5W-30 C3 oil meeting Jaguar TXW-50-001 is critical for turbo and chain lubrication. Short-trip driving leads to incomplete DPF regeneration, increasing backpressure and risk of limp mode. The Bosch CP3 fuel pump demands ultra-low-sulfur diesel (ULSD) meeting EN 590 to prevent high-pressure system failure. EGR and SCR systems require periodic inspection; AdBlue levels must be maintained to prevent start-up inhibition. Post-2007 models feature improved HPFP calibration, reducing wear in marginal fuel conditions.
Oil Specs: Requires SAE 5W-30 C3 meeting Jaguar TXW-50-001 (Jaguar SIB JAG-OIL-2005). Supersedes ACEA C3 standards.
Emissions: Euro 4 certification applies to pre-2007 models only (VCA Type Approval #VCA/JAG/AJD/2004). Some 2007-2010 models meet Euro 5 depending on market.
Power Ratings: Measured under ECER 85 standards. Output reflects engine-only test with full exhaust system and emissions controls.
Jaguar Technical Information System (TIS): Docs AJD-ENG-27-001, AJD-ENG-27-003, JAG-TIS-4505
VCA Type Approval Database (VCA/JAG/AJD/2004)
European Regulation (EC) No 715/2007
The Jaguar AJD was used across Jaguar's XF/XJ platforms with longitudinal mounting and no licensed external applications. This engine received model-specific tuning adjustments-optimized EGR flow on the XJ and revised intake manifolds on the XF-and from 2007 the facelifted XF and XJ models adopted updated fuel pump firmware, creating software compatibility limits. All adaptations are documented in OEM technical bulletins.
Locate the engine serial number stamped on the machined pad at the front of the right-hand cylinder block (Jaguar TIS AJD-ID-001). The "AJD" designation is cast into the cylinder head near the cam cover. XF 2.7D models feature a single VGT turbo with black heat shielding; XJ 2.7D units have revised exhaust routing. Critical differentiation from AJ-V8: The AJD has a 6-cylinder layout and absence of secondary air injection. Service parts require model-year verification—fuel pumps for pre-2007 models are incompatible with post-2007 revisions due to updated lubricity requirements and calibration (Jaguar SIB JAG-FUEL-2007).
The AJD's primary reliability risk is high-pressure fuel pump wear in vehicles operated with low-quality diesel, with elevated incidence in short-trip usage. Jaguar internal field reports from 2006–2009 noted a significant number of 2.7D models requiring HPFP replacement before 80,000 km, while UK DVSA MOT records show fuel system and emissions faults as frequent causes of advisory notices. Poor fuel quality and infrequent regeneration cycles accelerate wear, making correct diesel selection and regular highway driving critical.
Analysis derived from Jaguar technical bulletins (2004-2010) and UK DVSA failure statistics (2005-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about JAGUAR AJD.
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Regulation (EC) No 715/2007
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