LR121800 | Timing Chain Tensioner - 3.0L AJ300 Petrol/PHEV | Range Rover, Discovery
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To check the stock of Genuine Parts before placing an order please use our Contact Us page
Land Rover Part Number: LR121800 - Timing Chain Tensioner
LR121800 is a timing chain tensioner fitted to the timing gear of 3.0L AJ20P6 petrol engines on selected Land Rover models. The tensioner applies controlled pressure to the timing chain to remove slack and keep the chain engaged with the camshaft and crankshaft sprockets. Located in the timing gear / cylinder head area, it works together with chain guides to control chain travel as the engine cycles through varying loads and RPM, helping to prevent chain jump and reduce accelerated wear of sprockets and guides. Replacement of the tensioner is carried out as part of timing gear service and should be completed together with any related wear items to avoid premature failure of adjacent components; the part is intended for the 3.0L AJ20P6 petrol high-output and petrol PHEV applications used across the models listed below.
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 (2022-) - 3.0L AJ20P6 Petrol High, 3.0L AJ20P6 Petrol PHEV
- 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
LR121800 is a hydraulic timing chain tensioner that maintains correct chain tension on the 3.0L AJ20P6 petrol engine timing gear. It removes chain slack and keeps the chain engaged with the camshaft and crankshaft sprockets, working with guides to control chain travel and limit wear; replacement is normally completed during a timing gear service alongside related wear items.
| Model | Variant |
|---|---|
| Land Rover Discovery 5 (2017-) | 3.0L AJ20P6 Petrol High (From VIN L2000001) |
| Land Rover Defender (New) (2020-) | 3.0L AJ20P6 Petrol High (From VIN L2000001) |
| Land Rover Range Rover (New) (2022-) | 3.0L AJ20P6 Petrol High; 3.0L AJ20P6 Petrol PHEV |
| Land Rover Range Rover Sport (New) (2023-) | 3.0L AJ20P6 Petrol High; 3.0L AJ20P6 Petrol PHEV |
| Land Rover Range Rover (L405) (2013-2022) | 3.0L AJ20P6 Petrol High (From VIN KA000001) |
| Land Rover Range Rover Sport (L494) (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.
The tensioner should be replaced as part of a timing gear service or if inspection shows signs of wear or malfunction. It is recommended to replace associated timing wear items at the same time to avoid premature failure of adjacent components and to consult the vehicle service schedule for specific intervals.
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