September 18, 2023

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Water Pump Replacement – BMW B46/B48 Turbo 4 Cyl. Engine

The following article gives step-by-step instructions on replacing the water pump (coolant pump) in B46/B48 4-cylider engines.

Not sure which engine you have in your BMW? Use our engine finder tool to easily identify it!

Possible Symptoms: Engine overheating, higher than normal coolant temp, coolant leak from bottom of engine

This repair can be used on the following BMW models:

2013

225i Active Tourer, Cooper S 3 doors,

2014

220i Active Tourer, 220i Gran Tourer, 225i Active Tourer, 225iX Active Tourer, 320i Touring, 320iX Touring, 330i Touring, 730Li Sedan, 730i Sedan, Cooper S 3 doors, Cooper S 5 doors, Cooper S Clubman, Cooper S Convertible, JCW 3 doors, X1 20Li SUV, X1 20LiX SUV, X1 20i SUV, X1 20iX SUV, X1 25LiX SUV, X1 25iX SUV, X1 28i SUV, X1 28iX SUV,

2015

2016

120i 3 doors, 120i 5 doors, 120i Sedan, 125i 3 doors, 125i 5 doors, 125i Sedan, 220i Active Tourer, 220i Convertible, 220i Coupe, 220i Gran Tourer, 225i Active Tourer, 225iX Active Tourer, 230i Convertible, 230i Coupe, 230iX Convertible, 230iX Coupe, 320Li Sedan, 320LiX Sedan, 320i Gran Turismo, 320i Touring, 320iX Gran Turismo, 320iX Touring, 330Li Sedan, 330LiX Sedan, 330e Sedan, 330i Gran Turismo, 330i Sedan, 330i Touring, 330iX Gran Turismo, 330iX Sedan, 330iX Touring, 420i Convertible, 420i Coupe, 420i Gran Coupe, 420iX Coupe, 420iX Gran Coupe, 430i Convertible, 430i Coupe, 430i Gran Coupe, 430iX Convertible, 430iX Coupe, 430iX Gran Coupe, 520i 1.6 Sedan, 520i Sedan, 520i Touring, 525Li Sedan, 528Li Sedan, 530Le Sedan, 530Li Sedan, 530LiX Sedan, 530e Sedan, 530eX Sedan, 530i Sedan, 530i Touring, 530iX Sedan, 530iX Touring, 630i Gran Turismo, 730Li Sedan, 730i Sedan, 740Le Sedan, 740LeX Sedan, 740e Sedan, 740eX Sedan, Cooper S ALL4 Clubman, Cooper S ALL4 Countryman, Cooper S 3 doors, Cooper S 5 doors, Cooper S Clubman, Cooper S Convertible, Cooper S Countryman, JCW ALL4 Clubman, JCW ALL4 Countryman, JCW 3 doors, JCW Convertible, X1 20Li SUV, X1 20LiX SUV, X1 20i SUV, X1 20iX SUV, X1 25LiX SUV, X1 25iX SUV, X1 28i SUV, X1 28iX SUV, X2 20i SAC, X2 28iX SAC, X3 20i 1.6 SUV, X3 20i SUV, X3 20iX (TR51) SUV, X3 30iX (TR91) SUV, X3 30iX (TR92) SUV, X3 30iX SUV,

2017

120i 3 doors, 120i 5 doors, 120i Sedan, 125i 3 doors, 125i 5 doors, 125i Sedan, 220i Active Tourer, 220i Convertible, 220i Coupe, 220i Gran Tourer, 225i Active Tourer, 225iX Active Tourer, 230i Convertible, 230i Coupe, 230iX Convertible, 230iX Coupe, 320Li Sedan, 320LiX Sedan, 320i Gran Turismo, 320i Sedan, 320i Touring, 320iX Gran Turismo, 320iX Touring, 330Li Sedan, 330LiX Sedan, 330e Sedan, 330i Gran Turismo, 330i Sedan, 330i Touring, 330iX Gran Turismo, 330iX Sedan, 330iX Touring, 420i Convertible, 420i Coupe, 420i Gran Coupe, 420iX Coupe, 420iX Gran Coupe, 430i Convertible, 430i Coupe, 430i Gran Coupe, 430iX Convertible, 430iX Coupe, 430iX Gran Coupe, 520i 1.6 Sedan, 520i Sedan, 520i Touring, 525Li Sedan, 528Li Sedan, 530Le Sedan, 530Li Sedan, 530LiX Sedan, 530e Sedan, 530eX Sedan, 530i Sedan, 530i Touring, 530iX Sedan, 530iX Touring, 630i Gran Turismo, 730Li Sedan, 730i Sedan, 740Le Sedan, 740LeX Sedan, 740e Sedan, 740eX Sedan, Cooper S ALL4 Clubman, Cooper S ALL4 Countryman, Cooper S 3 doors, Cooper S 5 doors, Cooper S Clubman, Cooper S Convertible, Cooper S Countryman, JCW ALL4 Clubman, JCW ALL4 Countryman, JCW 3 doors, JCW Convertible, X1 20Li SUV, X1 20LiX SUV, X1 20i SUV, X1 20iX SUV, X1 25LiX SUV, X1 25iX SUV, X1 28i SUV, X1 28iX SUV, X2 20i SAC, X2 20iX SAC, X2 25iX SAC, X2 28i SAC, X2 28iX SAC, X2 M35iX SAC, X3 20i (TR12) SUV, X3 20i (TR16) SUV, X3 20i 1.6 SUV, X3 20i SUV, X3 20iX (TR51) SUV, X3 20iX (TR52) SUV, X3 20iX (TR55) SUV, X3 20iX (TR56) SUV, X3 25iX SUV, X3 28iX SUV, X3 30i SUV, X3 30iX (TR91) SUV, X3 30iX (TR92) SUV, X3 30iX (TR95) SUV, X3 30iX (TR96) SUV, X3 30iX SUV, X4 20iX SAC, X4 30iX SAC, Z4 20i Roadster, Z4 30i Roadster,

2018

120i 3 doors, 120i 5 doors, 120i Sedan, 125i 3 doors, 125i 5 doors, 125i Sedan, 220i Active Tourer, 220i Convertible, 220i Coupe, 220i Gran Tourer, 225i Active Tourer, 225iX Active Tourer, 228iX Gran Coupe, 230i Convertible, 230i Coupe, 230iX Convertible, 230iX Coupe, 320Li Sedan, 320LiX Sedan, 320i 1.6 Sedan, 320i Gran Turismo, 320i Sedan, 320i Touring, 320iX Gran Turismo, 320iX Sedan, 320iX Touring, 325Li Sedan, 325LiX Sedan, 325i Sedan, 330Li Sedan, 330LiX Sedan, 330e Sedan, 330i Gran Turismo, 330i Sedan, 330i Touring, 330iX Gran Turismo, 330iX Sedan, 330iX Touring, 420i Convertible, 420i Coupe, 420i Gran Coupe, 420iX Coupe, 420iX Gran Coupe, 430i Convertible, 430i Coupe, 430i Gran Coupe, 430iX Convertible, 430iX Coupe, 430iX Gran Coupe, 520i 1.6 Sedan, 520i Sedan, 520i Touring, 525Li Sedan, 530Le Sedan, 530Li Sedan, 530LiX Sedan, 530e Sedan, 530eX Sedan, 530i Sedan, 530i Touring, 530iX Sedan, 530iX Touring, 630i Gran Turismo, 730Li Sedan, 730i Sedan, 740Le Sedan, 740LeX Sedan, 740e Sedan, 740eX Sedan, Cooper S ALL4 Clubman, Cooper S ALL4 Countryman, Cooper S 3 doors, Cooper S 5 doors, Cooper S Clubman, Cooper S Convertible, Cooper S Countryman, JCW ALL4 Clubman, JCW ALL4 Countryman, JCW 3 doors, JCW Convertible, M135iX 5 doors, M235iX Gran Coupe, X1 20Li SUV, X1 20LiX SUV, X1 20i SUV, X1 20iX SUV, X1 25Li SUV, X1 25LiX SUV, X1 25iX SUV, X1 28i SUV, X1 28iX SUV, X2 20i SAC, X2 20iX SAC, X2 25i SAC, X2 25iX SAC, X2 28i SAC, X2 28iX SAC, X2 M35iX SAC, X3 20i (TR12) SUV, X3 20i (TR16) SUV, X3 20i 1.6 SUV, X3 20i SUV, X3 20iX (TR51) SUV, X3 20iX (TR52) SUV, X3 20iX (TR55) SUV, X3 20iX (TR56) SUV, X3 20iX SUV, X3 25iX SUV, X3 28iX SUV, X3 30eX SUV, X3 30i SUV, X3 30iX (TR91) SUV, X3 30iX (TR92) SUV, X3 30iX (TR95) SUV, X3 30iX (TR96) SUV, X3 30iX SUV, X4 20iX SAC, X4 30iX SAC, X5 30iX SUV, X6 30iX SAC, Z4 20i Roadster, Z4 30i Roadster,

2019

120i 3 doors, 120i 5 doors, 120i Sedan, 125i 3 doors, 125i 5 doors, 220i Active Tourer, 220i Convertible, 220i Coupe, 220i Gran Tourer, 225i Active Tourer, 225iX Active Tourer, 228iX Gran Coupe, 230i Convertible, 230i Coupe, 230iX Convertible, 230iX Coupe, 320Li Sedan, 320LiX Sedan, 320i 1.6 Sedan, 320i Gran Turismo, 320i Sedan, 320i Touring, 320iX Gran Turismo, 320iX Sedan, 320iX Touring, 325Li Sedan, 325LiX Sedan, 325i Sedan, 330LiX Sedan, 330e Sedan, 330i Gran Turismo, 330i Sedan, 330i Touring, 330iX Gran Turismo, 330iX Sedan, 330iX Touring, 420i Convertible, 420i Coupe, 420i Gran Coupe, 420iX Coupe, 420iX Gran Coupe, 430i Convertible, 430i Coupe, 430i Gran Coupe, 430iX Convertible, 430iX Coupe, 430iX Gran Coupe, 520i 1.6 Sedan, 520i Sedan, 520i Touring, 525Li Sedan, 530Le Sedan, 530Li Sedan, 530LiX Sedan, 530e Sedan, 530eX Sedan, 530i Sedan, 530i Touring, 530iX Sedan, 530iX Touring, 630i Gran Turismo, 730Li Sedan, 730i Sedan, 740Le Sedan, 740LeX Sedan, 740e Sedan, 740eX Sedan, Cooper S ALL4 Clubman, Cooper S ALL4 Countryman, Cooper S 3 doors, Cooper S 5 doors, Cooper S Clubman, Cooper S Convertible, Cooper S Countryman, JCW ALL4 Clubman, JCW ALL4 Countryman, JCW 3 doors, JCW Convertible, M135iX 5 doors, M235iX Gran Coupe, X1 20Li SUV, X1 20LiX SUV, X1 20i SUV, X1 20iX SUV, X1 25Li SUV, X1 25LiX SUV, X1 25iX SUV, X1 28i SUV, X1 28iX SUV, X2 20i SAC, X2 20iX SAC, X2 25i SAC, X2 25iX SAC, X2 28i SAC, X2 28iX SAC, X2 M35iX SAC, X3 20i (TR12) SUV, X3 20i (TR16) SUV, X3 20i 1.6 SUV, X3 20i SUV, X3 20iX (TR51) SUV, X3 20iX (TR52) SUV, X3 20iX (TR55) SUV, X3 20iX (TR56) SUV, X3 20iX SUV, X3 25iX SUV, X3 28iX SUV, X3 30eX SUV, X3 30i SUV, X3 30iX (TR91) SUV, X3 30iX (TR92) SUV, X3 30iX (TR95) SUV, X3 30iX (TR96) SUV, X3 30iX SUV, X4 20iX SAC, X4 30iX SAC, X5 30iX SUV, X6 30iX SAC, Z4 20i Roadster, Z4 30i Roadster,

2020

320i Sedan, 330e Sedan, 520i Sedan, 630i Gran Turismo, 730Li Sedan, 730i Sedan, X1 20i SUV, X1 20iX SUV,

Advanced level repair.

Step 1 - Purchase Parts

You will need the following parts and supplies to perform this repair.

Water Pump and Pulley

When it comes to engine parts, we firmly stand behind only using Genuine BMW. Genuine BMW are manufactured to a completely higher standard than the obscure aftermarket ones found on Amazon and Ebay. Don't be fooled by the lower prices..."imported" aftermarket water pumps will fail and honestly are in our opinion complete junk. This is a Genuine BMW factory water pump that is the exact same one installed at the dealership and guaranteed to give years of uninterrupted service.

Step 2 - Repair Procedure

Unless otherwise noted, all vehicle repair step images in this article are copyrighted, and used courtesy of BMW of North America, Inc. .

Before starting this repair, the coolant system must be drained.

Please see our article Coolant Flush and Replacement - BMW B46/B48 Turbo 4 Cylinder Engine for detailed instructions on draining and refilling the cooling system.

1. Replacing the water pump

Remove the acoustic cover from the engine

Click to enlarge image

- Pull the acoustic engine cover loose from the mounting points as shown in the image and remove from the vehicle.

View part diagram for this step

Water Pump Replacement – BMW B46/B48 Turbo 4 Cyl. Engine

Click to enlarge image

- Locate the water pump pulley. Loosen (do not remove) the three mounting bolts (1) as shown in the image.

View part diagram for this step

Click to enlarge image

- Locate the belt tensioner on the front of engine behind the vibration dampener pulley. the tensioner has a boss on the front of it that when turned clockwise will release the pressure on the drive belt.

View part diagram for this step