BMW E90 320si Petrol N45 Engine Coolant Hose Connector 7559333

The BMW E90 320si N45 Petrol Water Hose Connector is an original cooling system component designed for the N45 petrol engine in the 320si model. This used turbocharger and parts part allows for professional repair of the coolant circuit while maintaining factory geometry and fit.

Specifications and technical data

• SKU: 7559335-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7559333
• Substitutable numbers: 11537559335, 7559335, 7559333, 11537553973, 7553973
• Fuel type: Petrol
• Category: Turbos & Parts

Purpose and function of the water pipe connector

The water line connector in the N45 engine is responsible for stable coolant flow between cooling system components. A properly selected component ensures:

• tight connection of water lines with the engine block or accessories,
• maintaining the correct direction of coolant flow,
• reducing the risk of overheating of the drive unit,
• Compatibility with the factory mounting system of the BMW E90 320si.

The use of an original connector in the cooling system is particularly important in high-performance petrol engines, where a stable operating temperature affects the durability of the engine and accessories.

Benefits of using an original BMW component

This BMW water hose connector is sourced from the original equipment line, ensuring a precise fit for the N45 engine while maintaining factory flow parameters. In practice, this means:

• no need for modifications during assembly,
• compatibility with the standard cooling system and engine accessories,
• maintaining the stiffness and shape of the connector designed by the manufacturer,
• easier diagnostics and service in the future.

A used part allows for economical repair while maintaining manufacturer standards, which is particularly beneficial when servicing specialized versions such as the 320si.

Condition, verification and application in the N45 petrol engine

This component is offered as a used part, meaning that before being re-sold, it should be inspected for leaks, secure mounting, and no damage that could affect the cooling system. The connector is designed for a gasoline- powered engine, ensuring material and structural compatibility with the N45 engine.

When installing it is recommended to:

• checking the condition of the interconnecting water pipes,
• use of new seals in accordance with the manufacturer's recommendations,
• checking the correct positioning of the connector in relation to other components of the cooling system.

Application in service, repairs and tuning

The BMW E90 320si N45 Petrol Water Hose Connector is suitable for both standard cooling system repairs and projects where maintaining stock engine performance is essential, such as in cars prepared for amateur racing. Maintaining a stable operating temperature is also crucial when modifying accessories, including turbochargers and other components, so selecting the correct connector has a direct impact on the reliability of the entire system.

If you are looking for other water hose connectors for this brand, check out the available BMW water hose connectors to select the perfect component for your specific engine configuration.

More about using used parts in projects

When planning a cooling system repair or modification, it's worth understanding the broader context of using aftermarket components. Using genuine, used components can be a sensible compromise between cost and quality, especially in specialized models like the 320si. For more practical tips, check out The Best Used Parts for Your Car Tuning , which discusses how to wisely choose used components for demanding projects.