Mercedes Engine Rocker Arm - INA 6420500133

Product Information

An Engine Rocker Arm is a critical component in the valve train of an internal combustion engine. It acts as a lever that transfers the camshaft’s rotational motion into the up-and-down motion needed to open and close the intake and exhaust valves.

When the camshaft lobe pushes one side of the rocker arm, the other side presses down on the valve stem, allowing air-fuel mixture in (intake valve) or exhaust gases out (exhaust valve).

• Tapping or clicking noise from the engine – caused by excessive clearance or a loose/broken rocker arm.
• Engine misfire or rough idle – valves may not open properly, leading to incomplete combustion.
• Loss of power/poor acceleration – improper valve timing reduces engine efficiency.

About INA

Almost every modern passenger car contains an INA engine and transmission component. INA is a global manufacturer of OEM (Original Equipment Manufacturer) roller bearings, linear motion, engine components, plain bearings and precision components meaning that the original parts removed from your car will most likely have INA stamped right on it.

Today INA is a division of the Schaeffler Group, which also includes FAG and LuK, they are the second-largest bearing manufacturer in the world. Their bearings are used in the space shuttle and the Millennium Wheel in London. Schaeffler has manufacturing facilities all around the world including Danbury CT. We offer INA's full line of OE and OEM components for your European vehicle.

INA Timing Components

The timing drive is crucial for the perfect interaction between the camshaft and crankshaft. Power transmission is possible by means of a timing chain or toothed belt. Schaeffler has more than 100 years of experience in the field of chain drives and works continuously on the further development of its products in 18 research and development centers around the globe. Schaeffler is also a leading manufacturer of idler pulleys and mechanical belt tensioners for dry belt drives and belts in oil. The INA program for the independent aftermarket includes repair solutions with all relevant components for time-saving and professional repairs.

Technology leader in valve train

Irrespective of which future technologies will one day be up to date, road traffic cannot be imagined without classic combustion engines for the time being. In order to reduce consumption and emissions, an effective combustion process in the engine is crucial. The valve train is an important lever for achieving this. With its INA brand, Schaeffler is a pioneer when it comes to technical advancements in the valve train.