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 engin…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The AJD engine is fundamentally robust when operated under recommended conditions. Long-term reliability depends on regular highway driving to support DPF regeneration, use of correct oil (5W-30 C3), and adherence to service intervals. Urban-driven examples often face DPF and EGR issues, but well-maintained vehicles with consistent regeneration cycles demonstrate strong durability beyond 150,000 km.
The most common issues are high-pressure fuel pump failure, DPF clogging, EGR cooler failure, and turbo actuator sticking. These are documented in Jaguar service bulletins and field reports. HPFP and DPF problems arise from low-quality fuel and short-trip driving, while EGR and turbo faults are linked to carbon buildup. Fuel pump longevity depends on fuel lubricity and filtration.
The AJD engine was used in the Jaguar XF (2004–2010) and XJ (2004–2010), specifically in 2.7D variants. It was not used in F-Type or Land Rover models during this period. The engine was factory-fitted only and not offered as a retrofit option for earlier petrol models.
Yes, within mechanical limits. ECU remapping can increase output to approximately 150 kW (204 PS) and 450 Nm safely on stock hardware. Some owners upgrade the intercooler and exhaust for improved thermal management. However, increased soot load may challenge DPF capacity, requiring revised regeneration tuning. Power gains must be balanced against emissions compliance and long-term reliability.
Typical fuel consumption is ~6.0 L/100km (47.1 mpg UK) in combined driving for the XF 2.7D. Highway economy improves to ~5.2 L/100km (54.3 mpg UK). Real-world figures depend on driving style and regeneration frequency. Urban driving with frequent regeneration cycles may increase consumption to ~7.5 L/100km (37.7 mpg UK).
Yes. The AJD is an interference design. If the timing chain fails or jumps, piston-to-valve contact is likely, resulting in severe internal damage. While the chain system is robust, preventative maintenance—especially oil changes with correct specification—is essential to avoid catastrophic failure.
Jaguar specifies SAE 5W-30 C3 oil meeting Jaguar TXW-50-001 standard. This low-ash formulation protects the DPF and SCR system from contamination. Oil must be changed every 15,000 km or annually to maintain turbo and chain lubrication. Use of non-compliant oils can lead to DPF blockage and ECU fault conditions.
Comprehensive technical documentation and regulatory references
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JAGUAR Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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