BMW Z4 Series E85 2.5i 2.5si Petrol N52 Bare Engine N52B25A New Timing WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a bare engine.

The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

BMW Z4 Series E85 2.5i 2.5si Petrol N52 Bare Engine N52B25A New Timing WARRANTY is a complete, used engine block from the N52 family, designed for Z4 E85 models with a petrol engine. It is offered as a bare engine, which provides a solid foundation for a professional rebuild or replacement of a damaged engine in a BMW sports-touring car.

Specifications and technical data

• SKU: 0421071-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0421071
• Substitutable numbers: 11000421071, 0421071, 11000421072, 0421072
• Fuel type: Petrol
• Number of cylinders: 6
• Category: Engines
• Mileage: 59 000

Technical characteristics of the N52B25A engine

The presented engine belongs to the family of BMW N52 inline-six petrol units used in the 2.5i and 2.5si versions of the Z4 E85 model. The design is based on the classic BMW R6 layout, which ensures high refinement, smooth power delivery, and a characteristic, linear throttle response. The engine is designed for petrol fuel, and its architecture has been engineered for dynamic driving and stable load at higher RPMs.

The offered item is a bare engine, meaning a complete mechanical base without accessories, ideal for transferring existing auxiliary components from your current unit. This configuration allows for precise matching to the specific vehicle specification and quality control of the installed components.

Purpose and application in the BMW Z4 E85

The N52B25A engine in this configuration is dedicated to BMW Z4 E85 models in the 2.5i and 2.5si versions, where the priority is a combination of sporty character and daily usability. The inline-six cylinder layout ensures smooth operation and an adequate torque reserve, which translates into comfortable driving both on the highway and in urban conditions.

The unit will prove particularly useful in situations where the current engine has suffered major mechanical damage or requires costly repairs. Replacing it with a complete bare engine allows for reduced vehicle downtime and facilitates control over the service process, especially in specialized workshops dealing with the BMW brand.

Benefits of installing a bare engine with a new timing chain

Using a bare engine with a new timing chain provides a number of practical service and operational benefits:

• the ability to use existing accessories matched to the specific vehicle configuration,
• better control over the quality of installed auxiliary components,
• reduced risk of major failures associated with a worn timing system,
• more predictable repair costs compared to ad-hoc repairs of an old unit.

For BMW Z4 E85 users, this means stable engine operation, improved operational safety, and the possibility of further, informed engine maintenance based on a known installation history.

Condition, mileage, and purchase verification

The offered engine comes from the secondary market and is a used component, which allows for repair cost optimization while maintaining an appropriate level of quality. The declared mileage of the unit is important information when planning further operation and any preventive measures after installation, such as changing operating fluids or additional leak checks.

Before purchasing, it is worth verifying the compatibility of the unit with the specific vehicle equipment version and consulting the installation with a workshop specializing in the BMW brand. This will allow you to fully utilize the potential offered by the inline-six petrol engine in the Z4 E85 model.

Related BMW Engines and technical knowledge

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as blocks, cylinder heads, or complete power units, check out the available parts in the BMW Engines category.

For those who want to better understand the specifics of BMW power units and make informed service decisions, the material describing typical problems and repair costs may be helpful. It is worth reading the article Troublesome BMW E90 engines: check what can ruin your budget! to better assess the risks associated with the operation and service of engines of this brand.