LR121804 | Timing Chain Tensioner Arm - AJ20P6 Petrol | Range Rover, Range Rover Sport
To check the stock of Genuine Parts before placing an order please use our Contact Us page
To check the stock of Genuine Parts before placing an order please use our Contact Us page
Land Rover Part Number: LR121804 - Timing Chain Tensioner Arm
LR121804 is a Timing Chain Tensioner Arm. Fitted to the timing gear of 3.0L AJ20P6 petrol engines, the arm locates and supports the timing chain tensioner, positioning the tensioner so the timing chain runs against the guide and sprockets with controlled slack. It accepts the reaction force from the tensioner and provides a stable mounting point to limit unwanted chain movement; if the arm is scored, cracked or bent, increased chain slack can cause audible noise, variable valve timing faults and accelerated wear to other timing components.
Use the compatibility data below to confirm fitment against your V.I.N.
Compatibility
- Discovery 5 (2017-) - 3.0L AJ20P6 Petrol High (From VIN L2000001)
- New Defender (2020-) - 3.0L AJ20P6 Petrol High (From VIN L2000001)
- New Range Rover Sport (2023-) - 3.0L AJ20P6 Petrol High, 3.0L AJ20P6 Petrol PHEV
- Range Rover (2013-2022) - 3.0L AJ20P6 Petrol High (From VIN KA000001)
- Range Rover Sport (2014-2022) - 3.0L AJ20P6 Petrol High (From VIN KA000001)
- Range Rover Velar (2017-) - 3.0L AJ20P6 Petrol High (From VIN MA000001)
Frequently Asked Questions
The LR121804 timing chain tensioner arm positions and supports the chain tensioner so the timing chain runs correctly against its guide and sprockets, accepting the tensioner's reaction force. If the arm is scored, cracked or bent it can allow excess chain slack, causing audible noise, variable valve timing faults and accelerated wear of timing components; technicians replace the arm when such defects are found to restore correct tensioner alignment.
| Model | Variant |
|---|---|
| Land Rover Discovery 5 (2017-) | 3.0L AJ20P6 Petrol High (From VIN L2000001) |
| Land Rover New Defender (2020-) | 3.0L AJ20P6 Petrol High (From VIN L2000001) |
| Land Rover New Range Rover Sport (2023-) | 3.0L AJ20P6 Petrol High, 3.0L AJ20P6 Petrol PHEV (L461) |
| Land Rover Range Rover (2013-2022) | 3.0L AJ20P6 Petrol High (From VIN KA000001) |
| Land Rover Range Rover Sport (2014-2022) | 3.0L AJ20P6 Petrol High (From VIN KA000001) |
| Land Rover Range Rover Velar (2017-) | 3.0L AJ20P6 Petrol High (From VIN MA000001) |
If you are unsure of compatibility with your vehicle, you can also confirm by checking against your V.I.N. Simply reach out to us with your V.I.N and desired part number via our Contact page or use our Finding Part Numbers page.
Replace the arm if there are scored surfaces, cracked mounting points or bent geometry. Inspect the arm and the overall timing system during any timing-chain service and replace if defects are found; consult the vehicle's service schedule or a qualified technician if unsure.
- L8 products are genuine Land Rover parts.
All products and accessories available on LRDirect.com come with a 2-year warranty.