Are rocker arm and engine timing rocker arm the same thing?

Yes. "Rocker Arm" and "Engine timing rocker arm" refer to the same car part. Other common names include Engine timing rocker arm, Engine Timing Rocker Arm, Valve Rocker. The part is the same regardless of which name is used.

What are the symptoms of a faulty rocker arm?

A failing rocker arm often causes a tapping or ticking noise from the top of the engine, which can get louder as it wears. You may also notice rough running, a misfire, or an illuminated engine warning light if a valve is no longer opening correctly.

What does a rocker arm do and why does it fail?

The rocker arm transfers movement from the camshaft to open and close the engine's valves at the right time. It can fail through normal wear, lack of oil or dirty oil, or a worn pivot or roller, and worn rocker arms are commonly replaced as a set.

How do I find the correct rocker arm for my engine?

Rocker arms are specific to the engine and differ between inlet and exhaust valves on many designs. Enter your registration above to see rocker arms confirmed to fit your exact vehicle.

How much does a rocker arm cost?

The price of a rocker arm depends on your exact vehicle and the brand you choose. Enter your registration above to see parts confirmed to fit, then compare prices from the brands we stock on this page. Free UK delivery on orders over £99.

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Rocker Arm buying guide — what to know before you buy

Rocker arms (finger followers) transfer the lift motion from the camshaft lobes to the valve stems, opening the intake and exhaust valves at precisely the right moment in the engine cycle. Worn or damaged rocker arms cause tapping noises, loss of compression in affected cylinders, and reduced engine power.

Rocker arm types

Traditional rocker arms pivot on a shaft or ball stud and use the mechanical advantage of a lever to translate camshaft motion into valve lift. Modern engines predominantly use roller finger followers — a lightweight stamped-steel arm that runs a roller against the cam lobe rather than a sliding friction surface. Roller followers significantly reduce friction and wear compared to earlier designs.

Variable valve timing systems on many modern engines include roller arms with hydraulic pivot elements (HLAs — hydraulic lash adjusters) that automatically compensate for valve train wear, eliminating the need for periodic valve clearance adjustments. If an HLA collapses or sticks, it typically manifests as a ticking from the valve train that takes longer than normal to quiet after a cold start.

Failure symptoms

A persistent ticking or tapping noise from the top of the engine that does not reduce after warm-up indicates a worn rocker arm, collapsed hydraulic lash adjuster, or camshaft lobe wear. Loss of compression or a misfire on a specific cylinder can indicate a rocker arm that has dislodged from its pivot or suffered catastrophic failure — rare but possible on high-mileage engines with poor oil maintenance history.

Oil quality and change intervals have a significant effect on rocker arm and HLA life. Low oil pressure, dirty oil, or extended oil change intervals accelerate wear in the valve train.

Persistent ticking from top of engine
Ticking that takes long to quiet after cold start (HLA)
Misfire or rough running on one cylinder
Reduced compression on affected cylinder
Camshaft lobe scoring visible on inspection

Replacement

Rocker arm replacement requires removal of the camshaft cover (rocker cover) and camshaft(s). On engines with hydraulic lash adjusters, new HLAs should be fitted alongside new rocker arms. Always investigate the root cause (oil starvation, lack of servicing) when rocker arms fail prematurely. Use the registration lookup to confirm the correct rocker arms for your engine code.