4403856 | Timing Chain Tensioner - 4.0 Cologne V6 | Discovery 3, Discovery 4
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: 4403856 - Timing Chain Tensioner
4403856 is a Timing Chain Tensioner fitted to the balance shafts and drive of the 4.0 Cologne V6 engine. The tensioner controls slack in the timing chain assembly so the chain remains correctly engaged with the crankshaft, camshafts and balance shafts; this reduces noise, limits wear on sprockets and guides, and helps maintain the engine's intended valve and balance-shaft phasing. On engines with a balance shaft drive the tensioner forms part of the drive linking the crank to the balance shafts. Confirm engine type and VIN to ensure correct fitment for the vehicle.
Compatibility
- Discovery 3 - 4.0 Petrol V6
- Discovery 4 (2010-2016) - Cologne V6 4.0 EFI SOHC (From VIN AA000001)
Frequently Asked Questions
The 4403856 timing chain tensioner maintains correct chain tension on 4.0 Cologne V6 engines so the timing chain stays engaged with the crankshaft, camshafts and balance shafts. Proper tension reduces audible chain rattle and wear to sprockets and guides; a worn or seized tensioner can cause progressive timing component damage. Confirm engine type and VIN before fitting to ensure the correct unit is used.
| Model | Variant |
|---|---|
| Land Rover Discovery 3 | 4.0 Petrol V6 |
| Land Rover Discovery 4 (2010-2016) | Cologne V6 4.0 EFI SOHC (From VIN AA000001) |
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 tensioner if it is worn, seized or no longer able to control chain slack, particularly if there is audible chain rattle or evidence of progressive wear to timing components. Inspect the timing chain and tensioner during timing-related services and confirm fitment using the vehicle VIN.
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