BMW Z4 E85 E87 E88 E90 E91 E92 E93 Crankshaft Petrol N43B20A 318i Engine 7516040

BMW Z4 E85 E87 E88 E90 E91 E92 E93 Crankshaft Petrol N43B20A 318i is an original part from the Crankshafts group, designed for BMW petrol engines from the N43 family. This used OEM crankshaft is a solution for those looking to restore the proper operation of the power unit while maintaining factory geometry and engine performance characteristics.

Specifications and technical data

• SKU: 7516040
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7516040
• Substitutable numbers: 11217516040, 7516040
• Fuel type: Petrol
• Category: Crankshafts

Purpose and compatibility

The presented crankshaft is dedicated to four-cylinder, petrol BMW N43 series engines, used in models such as the 318i and selected versions of the BMW Z4 E85, as well as the 1 and 3 series generations E87, E88, E90, E91, E92, E93. Using an original crankshaft from the same engine family allows for maintaining the correct balance of the crank-piston system and the operating parameters specified by the manufacturer.

This solution is particularly recommended for petrol engine overhauls, where maintaining compliance with factory tolerances and minimizing the risk of vibration and excessive loads on the main bearings is crucial.

Technical characteristics and role in the engine

The crankshaft in a petrol engine serves as the central element of the crank-piston system, converting the reciprocating motion of the pistons into rotational motion transmitted further to the gearbox and drivetrain. In N43 units, it is responsible for:

• stable torque transmission at high rotational speeds,
• cooperation with connecting rod and main journals within the specified assembly clearances,
• maintaining the proper balance of the entire crank-piston system,
• ensuring the appropriate refinement of the petrol engine, including the reduction of vibration and noise.

The use of an original crankshaft from the same engine family is particularly important in direct petrol injection units, where dynamic loads are higher than in older designs.

Condition, verification, and use in repairs

The part comes from dismantling and is offered as a used BMW crankshaft, which allows for a significant reduction in repair costs compared to purchasing a new OEM part. This type of component is most often chosen for:

• major engine overhauls after seizure or bearing damage,
• repairs after piston-valve collisions, where the crank system has been overloaded,
• regeneration of power units in workshops specializing in the BMW brand.

Selecting the correct crankshaft for a specific version of the N43 engine requires comparing markings and parameters with service documentation or the BMW parts catalog, which helps avoid compatibility issues.

Benefits of using an original BMW crankshaft

Choosing an original element from the Crankshafts group for a BMW petrol engine ensures:

• preservation of the factory performance characteristics of the power unit,
• better cooperation with existing connecting rods and pistons,
• greater durability predictability compared to replacements of unknown origin,
• the possibility of professional engine regeneration in accordance with manufacturer procedures.

This solution is particularly attractive for workshops specializing in the BMW brand and for users who want to keep their car in a technical condition as close to the factory state as possible.

Related elements and further system expansion

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as other shafts, mating parts, or crank system components, check the available parts in the BMW Crankshafts category.

For those interested in a wider car modernization, including retrofitting with elements from higher equipment versions, tips on using parts from dismantling may be useful – you can find more on this topic in the article about retrofitting and upgrading BMW cars with used components.