Jaguar XJ X351 Engine Specialists – Rebuilt In-House | 12-Month Warranty
Expert rebuilds for every Jaguar XJ X351 - AJ-V8, Ingenium I6, Ingenium I4. In-house, OEM-spec, 12-month warranty.
Expert rebuilds for every Jaguar XJ X351 - AJ-V8, Ingenium I6, Ingenium I4. In-house, OEM-spec, 12-month warranty.
Jaguar XJ X351 Engine Replacement – Rebuilt In-House | 12-Month Warranty
At JLR Engine Specialists Ltd, every Jaguar XJ X351 engine is rebuilt in our dedicated workshop using only Jaguar-approved components. The XJ X351 spans X351 (2013–2019) and facelift (2019–2021) generations, and we support all factory-fitted engines. With over 185 Jaguar XJ X351 engines restored since 2009, we provide transparent, all-in pricing and a 12-month unlimited mileage warranty - backed by our specialist team.
Common Jaguar XJ X351 Engine Problems
These are the most frequent Jaguar XJ X351 engine issues we diagnose and repair in our workshop. Our solutions address the root cause, not just the symptoms.
| Symptom | Likely Cause | Our Solution |
|---|---|---|
| Rough idle after cold start | AJ-V8 timing chain tensioner wear (LR096682) | Updated tensioner kit + precision alignment per JLR TSB XJ-2017-09 |
| Oil warning light | AJ-V8 valley pan gasket failure (LR072310) | Reinforced valley pan gasket + full seal replacement |
| DPF warning light | Ingenium diesel particulate filter clogging | Full DPF regeneration + software update per JLR SWE-22-05 |
| Turbo lag at low speeds | Ingenium turbo actuator failure | Genuine updated actuator LR072310 + ECU recalibration |
Why Choose JLR Engine Specialists Workshop?
We're a specialist Jaguar engine workshop - not a broker or general garage. Every Jaguar XJ X351 engine is rebuilt in-house by our technicians, using only OEM-spec or premium aftermarket parts (Mahle, Elring, Jaguar).
Our service includes:
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Full strip-down and precision metrology
AJ-V8 timing chain health checks for XJ X351 high-mileage scenarios
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Diagnostics with Autologic and JLR SDD tools
XJ X351-specific ECU coding requirements and adaptation
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Upgrades for XJ X351-specific stress points
Reinforced valley pan gaskets for high-mileage luxury driving
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12-month unlimited mileage warranty - issued directly by us
Backed by our Billericay workshop, no third-party involvement
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UK-wide vehicle collection
Logistics handled from our Unit A5 Windsor Road facility
Since 2009, we've helped XJ X351 owners, luxury fleet managers, and classic Jaguar enthusiasts restore reliability - with no hidden diagnostics fees if you proceed.
Our In-House Rebuild Process
Every Jaguar XJ X351 engine undergoes our 5-step rebuild process:
Diagnosis
Scan for timing chain codes, EGR errors specific to XJ X351 luxury driving patterns
Metrology
- AJ-V8 timing chain health check
- Cooling system integrity
- MHEV system status for Ingenium models
Metrology
Measure cylinder wear, bearing clearances (<0.05mm tolerance)
Precision Standards
- Crankshaft runout (<0.05mm)
- Bearing clearance measurement
- Cylinder bore wear assessment
Machining
Block honing, head skimming - all done on-site
On-Site Facilities
- CNC cylinder head skimming
- Pressure testing
- Plateau honing
Upgrades
AJ-V8 → reinforced valley pan; Ingenium → updated turbo actuator LR072310
XJ X351-Specific Upgrades
- AJ-V8: Reinforced valley pan gasket
- Ingenium: Updated turbo actuator LR072310
- ECU recalibration for XJ X351 driving characteristics
Validation
45-minute dyno run + 15-mile luxury driving simulation road test
Testing Protocol
- 45-minute dyno run
- 15-mile luxury driving simulation road test
- Premium electronics integration check for XJ X351 systems
Diagnosis
Assess timing chain health, cooling integrity, MHEV system status
Comprehensive Testing
- AJ-V8 timing chain health check
- Cooling system integrity
- MHEV system status for Ingenium models
Metrology
Measure cylinder wear, bearing clearances (<0.05mm tolerance)
Precision Standards
- Crankshaft runout (<0.05mm)
- Bearing clearance measurement
- Cylinder bore wear assessment
Machining
Block honing, head skimming - all done on-site
On-Site Facilities
- CNC cylinder head skimming
- Pressure testing
- Plateau honing
Upgrades
AJ-V8 → reinforced valley pan; Ingenium → updated turbo actuator LR072310
XJ X351-Specific Upgrades
- AJ-V8: Reinforced valley pan gasket
- Ingenium: Updated turbo actuator LR072310
- ECU recalibration for XJ X351 driving characteristics
Validation
45-minute dyno run + 15-mile luxury driving simulation road test
Testing Protocol
- 45-minute dyno run
- 15-mile luxury driving simulation road test
- Premium electronics integration check for XJ X351 systems
Engine Deep Dives
Detailed breakdown of each Jaguar XJ X351 engine we rebuild, with our specialist approach to common issues.
AJ-V8 (2013–2019) – The Luxury Powerhouse
Ingenium I6 (2019–2021) – The Modern Refinement
Ingenium I4 (2019–2021) – The Efficient Executive
Executive & Luxury Use
The Jaguar XJ X351 was designed for refined, comfortable driving
We tailor rebuilds for:
Our Engine Specialties:
- Reinforced valley pan gaskets (LR072310)
- Updated turbo actuators LR072310
- Remanufactured EGR coolers
- Full DPF regeneration
- MHEV system diagnostics
Rebuilt vs. Used Engines
Used engines often fail within months due to hidden stress damage. Our rebuilt units include:
Used Engine Risks
- Hidden high-mileage stress damage in luxury-driven XJ X351
- Undetected timing chain wear from infrequent long drives
- Valley pan gasket leaks from oil change neglect
- DPF clogging from city-only usage patterns
- £5,500 "bargain" that fails during an executive commute
Our Rebuilt Engines
- Full disassembly and inspection
- OEM-spec components (Mahle, Elring, Jaguar Genuine)
- 12-month unlimited mileage warranty - issued directly from Billericay
- No hidden diagnostics fees if you proceed
- Address AJ-V8, Ingenium I6 & I4 specific XJ X351 systems
Frequently Asked Questions
From £7,500-£8,200 - including fitment, ECU reset, road test, and 12-month warranty. All work is performed at our Billericay workshop with genuine Jaguar parts and verified components.
With reinforced valley pan gaskets and updated timing chain kits (LR096682), yes. We've rebuilt over 95 XJ X351 AJ-V8 engines since 2009, addressing the specific wear patterns from luxury driving conditions at our Unit A5 Windsor Road facility.
Valley pan gasket failure (LR072310) is the most common issue, especially in high-mileage XJ X351 models. We replace it with a reinforced unit in every AJ-V8 rebuild at our Billericay workshop, along with all related seals to prevent recurrence.
Yes - we use Autologic and JLR SDD tools for full immobiliser sync, adaptation, and ECU coding specific to XJ X351 models. All diagnostics and coding is performed at Unit A5 Windsor Road by our Jaguar-certified technicians.
While some components are shared across Jaguar models, the XJ X351 uses unique engine mounts, ECU mappings, cooling systems, and exhaust configurations requiring model-specific expertise. Our rebuild process addresses all XJ X351-specific requirements.
Yes - we've rebuilt over 60 XJ X351 Ingenium I6 engines snce 2009, addressing turbo actuator failures (LR072310), MHEV system issues, and DPF clogging specific to the X351 facelift models. All rebuilds include our 12-month unlimited mileage warranty.