BMW 1 Series E81 E87 LCI E87N Diesel N47 Radiator Coolant Bottom Hose 7796870

BMW E81 E87 Water Hose Pipe Tube 7796870 is an original cooling system component designed for BMW vehicles with diesel engines. This specialized water hose ensures proper coolant circulation, which translates to stable engine operating temperature and safe operating conditions. Thanks to its factory origin from the BMW range, correct diameters, shape, and mounting points are maintained.

Specifications and technical data

• SKU: 7796870
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 4729914
• Substitutable numbers: 17124729914, 2729914, 17127811923, 7811923, 17127796870, 7796870, 4729914
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and Function in the Cooling System

The hose belongs to the category of Cooling System Hoses and Pipes and is responsible for transporting coolant between system components such as the radiator, engine block, and intermediate spigots. In diesel vehicles, proper fluid flow is crucial for maintaining the correct temperature range, especially under heavy loads and long highway driving.

A properly selected water hose:

• ensures a sealed connection in the cooling system,
• maintains the correct direction and flow rate of the fluid,
• reduces the risk of diesel engine overheating,
• minimizes the possibility of leaks at connections and clamps.

Original BMW Origin and Compatibility

The component comes from the BMW line, meaning factory quality and design standards are maintained. The hose has been designed for the specific cooling system in BMW E81/E87 series vehicles, ensuring:

• a perfect fit for original spigots and mounts without modification,
• maintenance of correct routing geometry within the engine bay,
• compliance with requirements for diesel-powered units.

This makes installation predictable and reduces the risk of improper hose positioning or mechanical stress.

Performance Characteristics and Installation

The water hose is made from a material resistant to coolant, temperature changes, and typical engine bay vibrations. In practice, this means:

• stable shape retention across a wide range of operating temperatures,
• resistance to periodic pressure surges in the cooling system,
• ability to operate in conditions characteristic of diesel engines.

When replacing, it is recommended to check the condition of the clamps, spigots, and other hoses in the system to ensure uniform sealing of the entire installation. A correctly installed hose supports trouble-free operation of the cooling system and reduces the risk of sudden failures related to fluid loss.

Used Condition – A Conscious Technical Choice

The offered hose is a used part, allowing for economical repair of the cooling system while maintaining original BMW specifications. This solution is particularly beneficial for older E81/E87 series models where a reasonable service cost is important while maintaining compliance with the factory design. A used component can be a good choice for users who prefer original components over aftermarket alternatives with uncertain parameters.

BMW Cooling System – Knowledge and Prevention

To fully utilize the potential of this hose, it is worth understanding how the entire cooling system affects engine longevity. A detailed discussion of common problems, overheating symptoms, and element selection principles can be found in the article: Engine Cooling System – Overheating, Repair, and Used Radiators. This provides practical knowledge for planning comprehensive cooling system maintenance in BMW cars and other makes.

If you are looking for other BMW Cooling System Hoses and Pipes for your car, check out our dedicated offer: BMW Cooling System Hoses and Pipes. This will help you easily select other system components, maintaining consistency in terms of brand and application.