ECS Tuning Billet Aluminium Water/Coolant Pump Pulley for BMW E36 E46 3 Series – 4-Bolt OE Replacement, Direct Fit Serpentine/Aux Belt Hard Anodised Alloy Upgrade

Upgrade your BMW cooling system with a robust alloy pulley engineered to outlast the fragile factory plastic unit. Built for daily driving, spirited road use and track days, this precision piece delivers long-term reliability and peace of mind.

Precision CNC machined from 6061 billet aluminium and finished with a hard anodised surface, this coolant pump drive pulley resists heat, vibration and corrosion. It is a direct-fit replacement that uses your standard auxiliary belt and original mounting bolts, so installation is straightforward when you are refreshing the water pump or belt drive.

• High-strength 6061 billet aluminium construction for maximum durability
• Hard anodised surface to help prevent corrosion and wear
• Drop-in fit with OE belt routing and factory fasteners
• Designed to replace the stock composite pulley that is prone to cracking
• Ideal while replacing the pump, thermostat or serpentine belt
• Perfect for BMW enthusiasts seeking a reliable cooling system upgrade

Fitment: BMW E36 and E46 applications that use the original four-bolt coolant pump pulley. If you are unsure about compatibility with your specific 3 Series model, contact us and we will be happy to help.

Why choose this pulley

• Stronger than the factory plastic part to reduce the risk of unexpected failures
• Consistent belt alignment thanks to precise machining
• Suitable for performance builds, road cars and track-focused setups
• Proven in our own workshop with excellent feedback from customers

Supersedes and previous revisions

• ECS-008
• 001977ECS01A
• 001977ECS03A
• 001977ECS03A-01

Installation and support

Professional fitting available at MJ Modifications in Warwickshire. For a quotation or booking, email info@mjmodifications.co.uk.

Common search terms

BMW E36 pulley upgrade, E46 coolant pump pulley, billet aluminium pulley, BMW 3 Series cooling system pulley, serpentine belt pulley, auxiliary belt drive pulley, OE replacement pulley, performance pulley for BMW, hard anodised alloy pulley, CNC machined pulley.

Add dependable strength to your engine bay and replace the failure-prone plastic wheel with this premium billet alternative. Order today and drive with confidence.