BMW E87 E90 E91 118i 120i 318i 320i Petrol N46 Piston Rod Conrod Engine

BMW E87 E90 E91 118i 120i 318i 320i Petrol N46 Piston Rod Conrod Engine is an original piston-connecting rod assembly component designed for N46 petrol engines in popular BMW 1 and 3 Series models. Thanks to its factory geometry and precise material selection, it ensures proper interaction with the cylinder, gudgeon pin, and crankshaft. This is a practical solution for engine repairs when it is necessary to replace a single piston with a connecting rod instead of the entire engine.

Specifications and technical data

• SKU: 7562451
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7562451
• Substitutable numbers: 1125756245111247589533, 75624517589533, 11257548001, 7548001, ŁS, 11257562451, 7562451
• Fuel type: Petrol
• Category: Other Engine Parts

Application in the N46 engine and compatibility

The presented piston with connecting rod has been designed for use in the N46 petrol engine found in BMW E87 and E90 series models in 118i, 120i, 318i, and 320i versions. Its specific design ensures a perfect fit for the combustion chamber, lubrication system, and the operating characteristics of the petrol unit, allowing for the maintenance of engine refinement and factory performance parameters.

By maintaining original dimensions and weight, this component enables the proper balance of the crankshaft-piston system, which is crucial for the durability of the crankshaft, bearings, and the entire powertrain. This is particularly important during selective repairs, when a single cylinder or a pair of components is being replaced.

Construction and role of the piston with connecting rod

The combination of the piston and connecting rod is responsible for transferring the force of the petrol mixture combustion into the rotational motion of the crankshaft. The correct shape of the piston crown, guidance within the cylinder liner, and interaction with piston rings affect the tightness of the combustion chamber, oil consumption, and engine efficiency. Precise fitting of the piston and connecting rod reduces vibrations and impact loads, which translates into stable engine operation across the entire rev range.

The appropriately selected cross-section of the connecting rod and the design of the big end ensure safe load transfer under typical operating conditions of a petrol engine, both in city driving and on longer trips. This solution allows for the preservation of the unit's factory operating characteristics without the need to modify other sub-assemblies.

Benefits of using an original component

Using an original piston with connecting rod in the N46 engine allows you to:

• maintain compliance with the engine's factory specifications,
• preserve the proper balance of the crankshaft-piston system,
• reduce the risk of improper fitment with the cylinder and gudgeon pin,
• minimize additional adjustment work during installation.

For workshops and users, this means faster repair completion and a lower risk of operational issues after engine assembly. Selecting a component compatible with the petrol unit is key to the durability of the repair and stable operating parameters.

Condition, verification, and selection of parts

The component is sourced from dismantling and is intended for reinstallation after prior assessment by a mechanic for wear, clearances, and potential machining of mating surfaces. When selecting, it is worth paying attention to compatibility with the specific version of the N46 engine and the configuration of the given BMW model to ensure proper interaction with the remaining pistons, crankshaft, and lubrication system.

To facilitate identification, the part has an assigned OEM number and associated interchangeable numbers, which allows for precise matching to a specific vehicle configuration. In case of doubt, a good solution is to compare the removed component with the offered product and consult a service center specializing in BMW engines.

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other elements from the same group, such as pistons, connecting rods, or other crankshaft-piston system components, check the available parts in the Other BMW category.

Technical support and knowledge about petrol units

When working with higher-output petrol units, it is worth knowing the structural differences between individual engine versions and the impact of components such as pistons, connecting rods, lubrication, or cooling systems on the durability of the entire drivetrain. Additional knowledge about the specifics of powerful units and their accessories can be found in the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, the differences in the construction of engines, brakes, and chassis in high-performance cars.