Skip to content
8–23 August: reduced summer staffing. Orders may take up to 5 extra working days to dispatch and emails up to 2 working days to answer. Thanks for your patience.
8–23 Aug: orders may ship up to 5 days later.
4121218LR - Arm - Valve Rocker by LAND ROVER Land Rover Range Rover

4121218LR - Valve Rocker Arm – V6 Petrol

- €12,30
€12,30
€12,30 - €12,30
€12,30
Genuine Part
Genuine: Original manufacturer part. This product is the original part designed and produced by the vehicle manufacturer.
Valve Rocker Arm operates in the cylinder head valvetrain of the 4.0L V6 Cologne SOHC petrol engine, transferring camshaft lift to the valve stem to open the valve.

It pivots on its mounting to convert the rotating camshaft motion into the reciprocating movement that actuates the valve.
Vehicle Model Land Rover Discovery 3 2005-2009 (L319)
Fitment Notes DISCOVERY 3 2005-2009 — 4.0 V6 Cologne EFI (SOHC) petrol, cylinder head; up to VIN 9A999999
Alternative Codes
4121218LR4121218

Available to order 2–3 weeks

Not currently in stock. Order now — typically ships within 2–3 weeks.

Need it faster? Contact us about express import (2–5 business days).

When will my order arrive?

This item is ordered from our supplier on request. Typical lead time is 2–3 weeks from order confirmation.

  • Netherlands / Belgium / Germany: 2–4 working days after dispatch.
  • Other EU countries + UK: 4–8 working days after dispatch.
  • Outside EU/UK: contact us for an estimate.

Need it faster? Express import available in 2–5 business days — contact us before ordering.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What does the Valve Rocker Arm do on the 4.0 V6?
The Valve Rocker Arm works in the cylinder head valvetrain of the 4.0 V6 Cologne SOHC petrol engine, transferring camshaft lift to the valve stem to open the valve. It pivots to turn the cam's rotating motion into the movement that actuates each valve.
How many rocker arms does the 4.0 V6 need?
The 4.0 V6 Cologne engine uses one rocker arm per valve, so a full valvetrain refresh needs a set covering every valve. They're often replaced together when one is worn, since they share the same running conditions across the cylinder head.
Does this rocker arm fit all Discovery 3 petrol engines?
This rocker arm fits the Land Rover Discovery 3 (2005-2009) 4.0 V6 Cologne EFI SOHC petrol engine up to VIN 9A999999. It's for the petrol V6 only, so confirm your engine and chassis number, as later builds differ.
What are the signs a rocker arm needs replacing?
A worn rocker arm on the 4.0 V6 typically shows up as a tapping or ticking noise from the cylinder head, and in severe cases uneven running. Wear at the valve or pivot contact point changes valve lift, so replacing worn rockers restores correct valvetrain action.