The backbone of the Discovery 4, Discovery 5, and the Range Rover Sport, we source, rebuild or recondition and fit code-verified 306DT engines in our state-of-the-art workshop. Every engine unit has a compression tested, ECU matched and protected by warranty for complete peace of mind.
Deep understanding of the 306DT across every Land Rover application, Discovery 4 (L319), Discovery 5 (L462), Range Rover Sport L320 and L494 covering TDV6 single-turbo (211 bhp) through SDV6 bi-turbo configurations producing up to 306 bhp.
Every replacement begins with engine code confirmation, crankshaft integrity assessment, turbo configuration matching, and ECU compatibility validation, ensuring correct fitment before dispatch or installation.
Sourcing, stripping, machining, reconditioning, quality control, and final installation, every step stays under our roof. No outsourced guesswork, no third-party unknowns.
Substantial cost advantages over franchised dealer rates with up to 12 months warranty and full confidence in every Land Rover 306DT engine we supply or fit anywhere in the UK.
The Land Rover 306DT 3.0 TDV6/SDV6 diesel engine is powerful, torquey, and refined — but it carries well-documented failure points that demand attention. Discovery 4 and Range Rover Sport owners are especially affected. At Britannia Rebuilds, we diagnose the exact fault before recommending repair, rebuild, reconditioning, or full engine replacement.
| Problem | Early Causes | Solution |
|---|---|---|
| Crankshaft failure | Incorrect bearing shell location during original assembly, or bearing rotation during use — acknowledged by Land Rover under SSM71816. Worsened by extended oil changes, blocked pick-up strainers, or heavy towing loads. | Stop driving immediately. Inspect bearings, crankshaft, and oil galleries. Once the crank scores the block, a full long-engine replacement with a reconditioned or rebuilt unit is the only reliable repair path. |
| Timing belt deterioration | The 306DT uses two timing belts (front and rear) plus a chain — belts degrade with age and must be replaced every 7 years or 105,000 miles. A snapped front belt risks piston-to-valve contact; a failed rear belt disables the fuel pump. | Replace both timing belts, tensioners, idlers, and water pump as a complete service kit. Inspect the rear fuel pump belt simultaneously. Follow the manufacturer's 7-year/105k interval strictly. |
| Turbocharger failure | Oil starvation from restricted feed lines, variable geometry vane seizure, or DPF back-pressure overloading the turbo bearings — particularly common on high-mileage bi-turbo SDV6 Discovery 4 models. | Check turbo shaft play, oil feed and return lines, VGT actuator operation, and DPF condition before replacing the turbocharger. Address root cause to prevent recurrence. |
| EGR cooler leak | Internal EGR cooler failure introduces coolant into the intake tract — causing white exhaust smoke, gradual coolant loss without visible external leaks, and potential cylinder head damage if left unchecked. | Replace the EGR cooler and valve assembly. Flush the intake and cooling system. Inspect the cylinder head for warping or gasket damage caused by coolant contamination. |
| DPF blockage | Frequent short journeys, school runs, and stop-start driving preventing passive regeneration — extremely common on Discovery 4s used as family vehicles in urban areas. | Attempt forced DPF regeneration via diagnostic equipment. If blockage is severe, replace the DPF. Regular motorway driving at sustained speed is essential to prevent recurrence. |
| Injector seal failure | Copper injector seals degrade over time, allowing combustion gases to leak past the injector seat — causing a distinctive "chuffing" noise, rough running, and diesel smell around the engine bay. | Replace all six injector seals and copper washers. Clean injector seats thoroughly. Test injector back-leak rates and spray patterns. Re-code injectors to the ECU if required. |
| Valve cover cracking | Plastic valve covers on the 306DT become brittle with heat cycling and age, developing hairline cracks that cause external oil leaks — a known weak point on the V6 diesel platform. | Replace cracked valve covers with new units. Inspect the gaskets and sealing surfaces. Clean any oil contamination from the exhaust manifold area to prevent smoke and smell. |
| Low oil pressure at idle | Worn main or big-end bearings, degraded oil pump, or blocked oil pick-up strainer allowing pressure to drop below safe thresholds at idle — often the earliest warning sign before crankshaft failure. | Test oil pressure mechanically. Inspect the oil pick-up strainer, pump condition, and bearing clearances. If pressure is critically low, assess the bottom end for rebuild viability or full engine replacement. |
Note: Land Rover acknowledged crankshaft/bearing concerns under reference SSM71816. We take every 306DT fault seriously and never recommend engine replacement without confirming the exact cause, protecting you from unnecessary cost.
Every Land Rover 306DT engine replacement is validated for engine code accuracy. TDV6/SDV6 variant matched ECU compatibility and drivetrain integration across Discovery 4, Discovery 5, and Range Rover Sport models.
Electronic fault tracing is combined with compression, leak-down, and lubrication analysis to determine whether the engine is structurally suitable for reconditioning.
The unit is dismantled to core level and cleaned thoroughly to remove carbon, sludge, coolant residue, and metallic debris without compromising machined surfaces or gallery integrity.
Cylinder geometry, crank journals, deck flatness, valve train wear and bearing tolerances are measured precisely, with honing, resurfacing, and seat correction carried out where required.
The engine is rebuilt using renewed wear components, updated timing and sealing hardware, and torque-angle assembly procedures to restore mechanical precision and durability.
Final testing verifies oil pressure, idle stability, thermal behaviour, and ECU compatibility so the finished engine delivers factory-level refinement and dependable performance.
Every Land Rover 306DT engine undergoes rigorous failure analysis, crankshaft integrity assessment, and precision machining before reconditioning begins, targeting the restoration of oil pressure, compression balance, timing accuracy, and thermal stability across all six cylinders.
Recent customer feedback from owners who used our engine supply, replacement, and fitting services.
They sourced the correct engine for my vehicle and the whole process was smooth from start to finish. Great communication and professional service throughout.
The rebuilt engine is perfect and running like new. I saved a significant amount compared to the main dealer and received fantastic advice and support. Very happy!
They verified my engine code, supplied the right engine and fitted it perfectly. Their knowledge and attention to detail gave me total peace of mind. Highly recommended.
Reconditioned engine supplied and fitted in less time than expected. The workshop team were professional and kept me updated at every stage.
View genuine workshop images that show the quality of our ongoing work, completed replacements and finished results.
A dependable replacement for the Land Rover 306DT engine commences not with a mere parts list, but with a comprehensive diagnostic assessment. At Britannia Rebuilds, we meticulously examine every compression reading, evaluate the condition of the crankshaft bearings, test the responsiveness of the turbo, and assess the health of the exhaust aftertreatment system prior to recommending any action. This structured method determines whether your Discovery or Sport requires targeted component repairs, a complete rebuild of the 306DT engine, or a total engine replacement from our verified inventory.
For those seeking a Land Rover 306DT engine for sale near me, we maintain an extensive stock of compression-tested used units, thoroughly rebuilt engines, and precision-reconditioned 306DT powerplants, all prepared for prompt dispatch throughout the United Kingdom. Whether you operate a Discovery 4 L319, a Discovery 5 L462, or a Range Rover Sport L320 or L494, we offer engines tailored to your specific model year and specifications, ranging from the earlier 211 bhp TDV6 to the 256 bhp bi-turbo and up to the 306 bhp SDV6. Each engine undergoes a rigorous code-verification process before leaving our facility.
The 306DT represents a collaboration between Ford and Land Rover, also recognised as the AJD-V6, and is utilised across various platforms, including Jaguar and Peugeot-Citroën (designated as 3.0 HDi). Accurately identifying the specific variant is critical, as TDV6 and SDV6 versions possess differing turbo configurations, ECU calibrations, and ancillary layouts. Consequently, every 306DT engine we supply adheres to our comprehensive suitability protocol, ensuring flawless compatibility with your vehicle's electronic systems, drivetrain, emissions systems, and, for Discovery 4 owners, the correct towing calibration. The outcome is a Land Rover that operates precisely as intended, powerful, reliable, and equipped to handle any challenge.
Quick answers about Land Rover engine supply, fitting, rebuilds, reconditioning, and warranty-related questions.
