BMW E46 E87 E90 Engine Block Housing N42 N46 118i 120i 318i 320i 7516330

BMW E46 E87 E90 Engine Block Housing N42 N46 118i 120i 318i 320i is an original component from the Engine blocks group, designed for BMW N42 and N46 petrol engines in popular 1 and 3 series models. This used housing provides a solid foundation for professional engine repair or rebuilding, ensuring factory-spec geometry and fitment for all accessories.

Specifications and technical data

• SKU: 7506329
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7506329
• Substitutable numbers: 7506329, 7516330
• Part type: Engine Block
• Category: Engine Blocks

Purpose and compatibility

The presented engine block housing is designed for N42 and N46 units used in BMW 1 Series (118i, 120i) and 3 Series (318i, 320i) models of the E46, E87, and E90 generations. By maintaining factory mounting points and oil/coolant channels, it allows for the restoration of the original engine configuration without the need for structural modifications.

This solution is dedicated to workshops and users who plan to rebuild their powertrain while maintaining the parameters specified by the manufacturer, while utilizing a proven, original base.

Technical characteristics of the block housing

The engine block housing serves a key load-bearing function for the entire powertrain – it transfers loads from the crankshaft, piston-connecting rod assembly, and cylinder head, while also integrating oil and cooling channels. For N42/N46 engines, it is particularly important to maintain:

• correct alignment of crankshaft journals,
• stable mounting of the cylinder head and accessories,
• structural rigidity in the cylinder area,
• precise routing of lubrication and cooling channels.

The original housing from the Engine blocks group allows these parameters to be maintained at a level consistent with BMW specifications, which has a direct impact on the engine's refinement, durability, and safety.

Condition, verification, and application in repairs

The item is in used condition, which in workshop practice means an attractive balance between cost and the possibility of further operation after proper preparation. This type of engine block housing is particularly useful in situations where the existing block has suffered mechanical damage (cracks, scoring, deformation) or is not suitable for further machining.

Before installation, standard workshop procedures are recommended, such as checking the flatness of mating surfaces, verifying main bearing seats, and inspecting the condition of threads and mounting points. This allows the housing to become a solid base for a complete engine rebuild, ensuring high assembly repeatability.

Importance for unit durability and the cooling system

A properly selected and prepared engine block has a direct impact on lubrication efficiency and the stability of the unit's operating temperature. In N42/N46 engines, correct routing of cooling and oil channels within the block is crucial to avoid local overheating and oil pressure drops. It is worth remembering that the condition of the block works in tandem with the efficiency of the entire cooling system – from the pump and thermostat to the radiator.

To better understand how the condition of the block and cooling system affects the lifespan of the powertrain, it is worth reading the guide: Engine cooling system – overheating, repair, and used radiators.

Project expansion and other BMW engine blocks

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other components from the same group, such as crankcases, engine blocks, or other powertrain housings, check out the available parts in the BMW engine blocks category.

When it comes to used structural engine components, it is also worth verifying your approach to second-hand parts – many of them, after proper assessment and preparation, provide long-term, trouble-free operation. You can find more on this topic in the article: Used car parts: Myths and facts you need to know.