Out of Stock
BMW M3 E46 Z4 M3 E85 E86 Z3M E36 Petrol S54 Radiator Fan Pulley 7840403
SKU: 7840403
Product from a certified dismantling facility
Condition:
Used
Available:
0
Delivery time:
Product currently unavailable
Payment methods:
Returns:
60 days return for UK 30 days return for other countries
Delivery from:
£0.00
This part is currently not available. Leave your email and we will notify you when the product is available again.
BMW M3 E46 Z4 M3 E85 E86 Z3M E36 Petrol S54 Radiator Fan Pulley is an original component from the Fans and fan shrouds group, designed for use with the S54 unit in petrol-powered BMW vehicles. This precision-engineered pulley is responsible for the stable transmission of drive to the radiator fan, which translates into efficient heat dissipation from the cooling system and safe engine operation.
Specifications and technical data
- SKU: 7840403
- Mark: BMW (Genuine OE)
- Condition: Used
- OEM Part Number: 7840403
- Substitutable numbers: 7840403, 11517840403, 7830704, 11517830704
- Fuel type: Petrol
- Category: Fan & Shroud Assemblies
Purpose and function of the radiator fan pulley
The presented pulley is a component of the radiator fan drive in sports BMW models with the petrol-powered S54 engine. Its task is to mechanically connect the drive system to the fan so that the fan's rotational speed is properly matched to the engine load and operating conditions.
A properly selected pulley:
- ensures stable torque transmission to the radiator fan,
- maintains the correct geometry of the accessory belt operation,
- reduces the risk of slippage and excessive vibrations in the system,
- supports the maintenance of the optimal operating temperature of the S54 unit.
Benefits of using an original BMW component
Using an original pulley from the Fans and fan shrouds group in BMW M3 E46, Z4 M3 E85, and Z3M E36 models allows you to maintain the factory operating parameters of the cooling system. An element designed for a specific engine and accessory layout guarantees a proper fit with other components, such as the fan, viscous clutch, or water pump mounts.
The most important advantages of using an original pulley include:
- compatibility with the S54 unit – no need for modifications or adjustments,
- preservation of the factory accessory belt routing,
- properly selected diameter and working profile for cooling system requirements,
- consistency with other fan drive components in sports BMW models.
Performance characteristics and application in a petrol engine
The pulley has been designed for the S54 petrol engine, which operates at high RPMs and generates significant thermal loads. In such conditions, it is crucial that the radiator fan drive operates predictably and without interference. A properly selected pulley working profile helps maintain:
- stable fan operation at high rotational speeds,
- proper cooling during dynamic driving,
- safe coolant temperature in both track and city conditions.
As a result, this element is an important link in the entire cooling system, influencing the durability of the engine unit and the comfort of vehicle operation.
Condition, installation, and selection by OEM number
The offered pulley comes from dismantling and has the status of a used original BMW component, which allows you to combine an attractive cost with the preservation of factory specifications. Before installation, a standard visual inspection for any signs of operational wear is recommended to ensure trouble-free long-term operation.
Selecting parts for a specific vehicle should be based on the OEM number and vehicle data. In practice, this helps avoid ordering errors and guarantees that the pulley will work with the existing fan drive system. If you want to check step-by-step how to properly match an element by OEM number or vehicle data, the following guide will be helpful: how to choose the right car part by VIN and OEM number.
BMW fans and fan shrouds – expansion and cooling system service
If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other elements from the same group, such as radiator fans, fan shrouds, or additional mounting elements, check the available parts in the BMW fans and fan shrouds category.
To better understand how the operation of the fan and the entire cooling system affects engine safety at high temperatures, it is worth reading our guide: Summer heat vs. cooling system – used radiators and fans as a way to save money. This will make it easier for you to plan service and choose the right components for your car.
Delivery details
Ship to: United Kingdom
Check delivery times for another country
Delivery Price
Service
Postage and packaging
Service
Postage and packaging
Delivery time
Estimated delivery dates include sellers dispatch time, origin postcode,destination postcode and time of acceptance, and will depend on the postage service selected and receipt of cleared payment. Delivery times may vary, especially during peak periods.
Will usually dispatch within same working day if paid before 14:00 BST (excludes weekends and holidays). Expected dispatch time may vary and is based on sellers order cut-off time.
In the automotive store Global Parts, we offer fast and secure deliveries for our customers in United Kingdom, ensuring maximum compliance with local service standards. Each order is processed with the utmost attention, guaranteeing a fluid shopping process and a timely delivery. If you need assistance in choosing the right part, our team of consultants will be happy to help you find the right part for your vehicle and provide information on installation, availability and parameters of the selected components.
