BMW F80 M3 F82 M4 Heat Shield Cylinders 4-6 Engine 7848040

BMW F80 M3 F82 M4 Heat Shield Cylinders 4-6 Engine is an original component from the Heat shields, connectors and sleeves group, designed specifically to protect the cylinder 4–6 section in the BMW M-series power unit. The precisely shaped shield helps reduce heat transfer to adjacent components, which promotes stable engine operation and improves thermal conditions in the engine bay. Thanks to its factory origin, it ensures a proper fit to the cylinder head and manifold structure without the need for modifications.

Specifications and technical data

• SKU: 7848040
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7848040
• Substitutable numbers: 11657848040, 7848040
• Category: Heat Shields, Wraps & Sleeves

Purpose and function of the heat shield

The cylinder 4–6 heat shield in the BMW F80 M3 and F82 M4 is responsible for controlling temperature distribution in the rear part of the inline engine. This component limits the impact of high exhaust temperatures on:

• cables and wiring harnesses routed along the engine block,
• accessory components located near the manifolds,
• insulation materials and plastic components in the rear zone of the engine bay.

As a result, the thermal resistance of the entire area is improved, and the risk of overheating local components is significantly reduced. This is particularly important in high-power vehicles, where the engine often operates under heavy load.

Construction and fitment for BMW F80 M3 / F82 M4

The shield was developed by BMW as part of the factory thermal management system in the engine bay. Its shape and mounting points are adapted to the geometry of the power unit and exhaust system in the F80 M3 and F82 M4 models, which allows for installation in original locations without any modifications.

Precise fitment translates into:

• stable mounting even under high vibrations and thermal loads,
• proper guidance of the heat flow along the shielded surfaces,
• maintaining the appropriate distance from adjacent components.

Such a solution supports the preservation of factory engine operating parameters and facilitates servicing, as the shield works with other thermal system elements in accordance with the manufacturer's design.

Benefits of using an original heat shield

Using an original cylinder 4–6 heat shield in the BMW F80 M3 / F82 M4 brings a number of practical operational benefits:

• Better thermal protection – reduction of direct heat radiation on sensitive components in the rear part of the engine.
• More stable operating conditions for accessories – lower temperature fluctuations around cables, connectors, and sleeves, which promotes their durability.
• Consistency with factory design – maintaining the original routing of heat shields and screens, which is important during service and diagnostics.
• A reasonable choice for repairs – especially when replacing exhaust system components or working in the rear part of the cylinder head, when the existing shield is damaged or deformed.

Product condition and service application

The presented heat shield is a second-hand component, in used condition, which makes it a practical solution for repairs where compliance with the original and cost control are important. This type of part will work well both for standard replacement of worn-out heat shields and for rebuilding a power unit after intensive track or tuning use.

Due to its factory origin, the shield retains the correct geometry and mounting points, which facilitates installation in workshop conditions and allows for maintaining consistency with other elements from the Heat shields, connectors and sleeves group.

Expansion of the BMW thermal protection system

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 additional shields, connectors, or sleeves, check the available parts in the BMW heat shields, connectors and sleeves category.

For drivers who are simultaneously working on improving the vehicle's handling and stability, a practical suspension guide may be helpful – more information can be found in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers.