BMW F20 F21 LCI SCR Metering Module Coolant Pump Pipe Hose B37 Diesel 8473993

BMW F20 F21 LCI SCR Metering Module Coolant Pump Pipe Hose B37 Diesel is a specialized component of the exhaust gas treatment system in diesel engines, designed to work with the B37 unit. It is responsible for reliably supplying coolant to the SCR pump, which supports stable operating temperatures and the proper functioning of the emission reduction system. Thanks to its precise geometry and factory fit, it provides a reliable service solution for facelifted BMW 1 Series F20/F21 models.

Specifications and technical data

• SKU: 8473993-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8473993
• Substitutable numbers: 11538473993, 8473993
• Fuel type: Diesel
• Category: Vacuum Pumps

Purpose and function of the SCR pump hose

The SCR pump coolant hose in the B37 diesel system is responsible for stable cooling of the selective catalytic reduction system components. Maintaining the appropriate temperature in the SCR pump area is crucial for the correct operation of the dosing agent and for limiting nitrogen oxide emissions.

This element operates in the immediate vicinity of the exhaust system and the engine, which is why it must feature a durable construction and proper routing of the cooling medium. The correct hose minimizes the risk of pump overheating, uneven SCR system operation, and potential error codes stored in the engine control unit.

Compatibility with the B37 Diesel engine

The hose in question has been designed to work with the B37 diesel engine used in the facelifted (LCI) BMW F20 and F21. This ensures compatibility with the engine unit's geometry, the placement of connectors, and the coolant routing path in the engine bay.

Thanks to its factory origin from the BMW group, the following are maintained:

• appropriate connection diameters for the SCR pump and cooling system,
• hose routing matched to the serial placement of components in the engine bay,
• operating parameters adapted to the characteristics of the B37 Diesel unit.

Such a fit reduces the need for installation modifications and allows for the maintenance of the original cooling and SCR system architecture.

Benefits of using an original hose

Using an SCR pump coolant hose dedicated to the BMW F20/F21 LCI with a B37 engine brings a number of practical service benefits:

• Proper coolant circulation in the SCR pump area, which promotes stable operation of the emission reduction system.
• Reduced risk of leaks resulting from the use of components with incorrect shapes or diameters.
• Better repeatability of system operating parameters compared to replacements of uncertain origin.
• Consistency with the factory configuration of the cooling and SCR system in BMW diesel vehicles.

For users who drive their cars mainly in urban or mixed cycles, where the SCR system works intensively, the correct pump cooling hose is essential for the durability of the entire system.

Characteristics of the Vacuum Pumps category for BMW

Within BMW engine systems, elements related to pumps – both vacuum and auxiliary – form an extensive group of components responsible for the proper operation of the engine unit and associated systems. Hoses, connectors, supply lines, and cooling lines, such as the presented SCR pump coolant hose, work with pumps and the cooling system, ensuring stable operating conditions across various engine load ranges.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as supply lines, vacuum lines, or connectors working with pumps, check the available parts in the BMW Vacuum Pumps category.

Part selection vs. fuel system and SCR

In modern diesel units, the correct selection of elements for the SCR and fuel systems has a direct impact on engine refinement, fuel consumption, and emission levels. It is worth using reliable sources of knowledge regarding diagnostics, regeneration, and component selection based on manufacturer markings or vehicle data. Practical tips in this regard can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which discusses, among other things, the operating principles of pumps and related elements.

Summary

BMW F20 F21 LCI SCR Metering Module Coolant Pump Pipe Hose B37 Diesel is a functional element designed for B37 diesel engines, supporting the stable operation of the SCR system through proper pump cooling. The precise fit to the architecture of the BMW engine unit facilitates installation and allows for the maintenance of the factory configuration of the cooling and exhaust gas treatment system. It is a sensible choice for users who want to restore the proper functioning of the emission reduction system in their facelifted 1 Series vehicles.