BMW E81 E87 LCI E90 E91 118i 318i Complete Engine N43B20A New Timing WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The warranty covers the engine itself; engine accessories are covered by a 30-day warranty.

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

Listing details

The offer applies to a complete engine.

The engine comes from a right-hand drive (RHD) vehicle. The wiring harness is not compatible with left-hand drive (LHD) vehicles and requires replacement or modification.

BMW E81 E87 LCI E90 E91 118i 318i Complete Engine N43B20A New Timing WARRANTY is a complete engine block from the N43 family, designed for the petrol 118i and 318i versions. This unit belongs to a more modern generation of BMW engines, and the installation of a new timing chain kit significantly increases its appeal as a base for replacing the powertrain in your vehicle.

Specifications and technical data

• SKU: 0427103-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0427103
• Substitutable numbers: 11000427103, 0427103, 11000427104, 0427104, N43, N43B20
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 59 000

Technical characteristics of the N43B20A engine

The presented engine belongs to the Engines category and is designed for petrol fuel. The four-cylinder construction ensures a good balance between refinement and operating economy, which is particularly important in the daily use of BMW 1 Series E87 and 3 Series E90 models in 118i and 318i versions.

The N43B20A unit was designed as a more modern construction compared to earlier naturally aspirated engines, with an emphasis on precise combustion process control. As a result, the engine works well with the vehicle's factory electronics, maintaining appropriate dynamics and predictable torque characteristics.

New timing chain – a key element of reliability

This unit features a new timing chain kit, which is of great importance in terms of durability and operational safety. The timing system in N43 engines is a critical component, and its recent replacement reduces the risk of costly failures associated with chain skipping or timing phase misalignment.

For the user, this means, among other things:

• reduced risk of sudden mechanical failures within the timing drive,
• more stable engine operation across the entire rev range,
• better conditions for further diagnostics and tuning of other engine components.

Purpose and application in BMW E87 / E90

The N43B20A engine is dedicated to BMW E87 118i and BMW E90 318i petrol models. Thanks to its structural compatibility with factory BMW solutions, it serves as a suitable base for replacing the power unit in the event of a serious failure of the existing engine or for projects aimed at restoring the car to full technical efficiency.

The four-cylinder unit fits well with the character of light, compact BMW models, providing a reasonable compromise between performance and fuel consumption. For workshops and private users, this means the possibility of using a proven construction that is widely described in service literature and well-known to independent workshops specializing in the BMW brand.

Condition, mileage, and benefits of installation

The engine is in used condition, with documented mileage, which allows for a better assessment of its service history. Such a choice is often economically advantageous compared to a full rebuild of a worn-out unit, especially when a new timing chain has already been installed.

The main advantages of installing this unit include:

• reduced vehicle downtime in the workshop compared to a full overhaul of an old engine,
• the ability to use the vehicle's existing auxiliary infrastructure (after proper adjustment by a mechanic),
• an attractive cost-to-potential-service-life ratio.

Technical support and additional information

Before purchasing, it is worth verifying the unit's compatibility with the specific equipment version and model year of your BMW using the available part numbers and interchangeable numbers in the specification section. This will help you avoid issues with the compatibility of the engine control unit, wiring harness, and accessories.

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 engines, check out the available parts in the BMW Engines category.

For E90 model users, a practical guide regarding common engine problems in this series may be particularly useful – you can find it in the article Troublesome BMW E90 engines: check what can ruin your budget!, which will help you better plan the scope of work and the budget for engine repair or replacement.