Land Rover AJ133 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility

A reconditioned Land Rover AJ133 engine typically costs between £5,500 and £9,000 for supply only, with fitted prices ranging from £6,410 to £10,170. Used units start around £3,000 but carry a high risk of inherited timing chain or supercharger issues. Full rebuilt units for high-performance SVR applications can exceed £12,000. Labour typically adds 14-18 hours at £65-£85/hr for an independent specialist.

• Used units start around £3,000 but carry a high risk of inherited timing chain or supercharger issues.
• Full rebuilt units for high-performance SVR applications can exceed £12,000.
• Labour typically adds 14-18 hours at £65-£85/hr for an independent specialist.

The most critical failure on early (2009-2012) AJ133 engines is timing chain tensioner wear, which can lead to catastrophic valve-to-piston contact. Supercharger coupler degradation is also highly prevalent, causing a distinct rattling noise at idle. Plastic coolant crossover pipes in the V8 valley become brittle and leak over time. Post-2013 models received revised tensioners and are significantly more robust.

• Supercharger coupler degradation is also highly prevalent, causing a distinct rattling noise at idle.
• Plastic coolant crossover pipes in the V8 valley become brittle and leak over time.
• Post-2013 models received revised tensioners and are significantly more robust.

The AJ133 5.0-litre supercharged V8 was fitted to the Range Rover (L322 and L405), Range Rover Sport (L320 and L494), and Discovery 4 (L319) between 2009 and 2022. It served as the flagship performance engine for high-spec models and the SVR variants. Power outputs ranged from 510 hp in standard tunes to 550 hp in SVR applications. It replaced the older 4.2-litre supercharged V8 across the entire performance lineup.

• It served as the flagship performance engine for high-spec models and the SVR variants.
• Power outputs ranged from 510 hp in standard tunes to 550 hp in SVR applications.
• It replaced the older 4.2-litre supercharged V8 across the entire performance lineup.

For any supercharged Land Rover, a reconditioned AJ133 is strongly recommended over a used unit due to the high cost of timing chain repairs. Used engines often inherit the pre-2013 tensioner flaws or worn supercharger couplers. A proper reconditioned build proactively installs the revised post-2013 timing components. Reconditioned units also include updated metal coolant crossover pipes to prevent future overheating.

• Used engines often inherit the pre-2013 tensioner flaws or worn supercharger couplers.
• A proper reconditioned build proactively installs the revised post-2013 timing components.
• Reconditioned units also include updated metal coolant crossover pipes to prevent future overheating.

You can confirm your engine code by checking the V5C registration document under the "Engine Number" field or by locating the code stamped on the front of the cylinder block. The AJ133 is easily distinguished from the naturally aspirated 508PN by its Roots-type supercharger and specific casting marks. It is also the mechanical twin of the Land Rover-badged 508PS, though ECU calibrations may differ slightly between Jaguar and Land Rover applications. Fitting a 508PN wiring loom or ECU to a supercharged AJ133 will result in incorrect fueling, severe knocking, and rapid engine destruction.

• The AJ133 is easily distinguished from the naturally aspirated 508PN by its Roots-type supercharger and specific casting marks.
• It is also the mechanical twin of the Land Rover-badged 508PS, though ECU calibrations may differ slightly between Jaguar and Land Rover applications.
• Fitting a 508PN wiring loom or ECU to a supercharged AJ133 will result in incorrect fueling, severe knocking, and rapid engine destruction.