BMW E87 E90 E91 118i 318i 129HP Bare Engine N46B20B with 80k 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 E87 E90 E91 118i 318i 129HP Bare Engine N46B20B with 80k WARRANTY is a used, complete block with cylinder head designed for BMW 1 and 3 series four-cylinder petrol engines. This bare engine is the ideal base for professional repairs or engine swaps when the existing engine has suffered severe mechanical damage. By maintaining the factory architecture of the N46B20B unit, it provides a solid foundation for the installation of peripheral components.

Specifications and technical data

• SKU: 0430936
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 430936
• Substitutable numbers: 11000430936, 0430936, 11000391994, 0391994, 11000430937, 0430937, 11000391995, 0391995, N46B20AY
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 59 000

Purpose and compatibility of the N46B20B unit

The offered engine is dedicated to BMW 1 Series E87 118i and BMW 3 Series E90/E91 318i models with a 129 HP petrol engine. The four-cylinder inline design ensures good operating refinement and predictable performance in daily use. The bare engine allows for the transfer of peripherals from the previous unit, which facilitates compatibility with the electrical system, intake, and exhaust systems of the specific vehicle.

Technical characteristics and advantages of the bare engine

The engine belongs to the BMW family of petrol units, which means it features the brand's typical design solutions, such as an aluminium block with cast iron cylinder liners and a cylinder head adapted for operation under a wide range of loads. The four-cylinder layout promotes a balance between performance and fuel consumption, while its compact dimensions facilitate installation in the engine bays of the 1 and 3 series.

The bare engine is a particularly cost-effective choice when the existing block or head is damaged, but the peripherals (e.g., manifolds, pumps, wiring harness) are still suitable for further use. This allows for optimized repair costs while maintaining the original operating characteristics of the powertrain. A used engine with documented mileage is often more predictable than uncertain replacements of unknown origin.

Practical application in service

This engine is suitable for both standard replacement of a damaged unit and more advanced renovation projects. A mechanic can transfer the peripherals from the previous unit, maintaining the vehicle's configuration, which limits the need for additional adaptations. The engine's mileage allows for further operation provided that proper maintenance, such as regular oil and filter changes, is performed.

For workshops specializing in the BMW brand, such an engine is a convenient solution because it enables relatively quick restoration of vehicle functionality after a mechanical failure, while maintaining factory operating parameters. Proper selection based on the engine code and OEM numbers minimizes the risk of compatibility issues.

Selection by VIN/OEM and technical support

When purchasing a used engine, it is crucial to match the unit to the specific equipment version and production year of the vehicle. Verification via VIN and part numbers helps avoid discrepancies regarding mounts, sensors, or control systems. It is worth using the selection procedures applied in professional workshops to ensure that the chosen engine will work correctly with the existing engine control unit and wiring.

If you would like to learn more about the cost-effectiveness of purchasing used powertrains and the principles of their proper selection, check out our guide Why it is worth buying used gearboxes and engines – facts instead of myths, which discusses, among other things, the differences between individual variants, inspection procedures, and repair cost ratios.

Expanding repairs in the BMW Engines area

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, heads, or complete power units, check out the available parts in the BMW Engines category.

Summary of purchase benefits

BMW E87 E90 E91 118i 318i 129HP Bare Engine N46B20B with 80k WARRANTY is a practical solution for users and workshops that want to restore vehicle functionality while maintaining the manufacturer's original specifications. The used four-cylinder petrol engine provides a solid base for the installation of peripherals, allowing for optimized repair costs and reduced vehicle downtime in the workshop.