Removing and installing/replacing coolant pump (B46/B48 4-Cyl. Engine) (4' Series Coupe/Convertible, 4' Series Gran Coupe Sedan)

Necessary preliminary work: 

• Drain COOLANT .
• Remove ACOUSTIC COVER AT FRONT .

Removal: 

Slacken screws (1)

Remove DRIVE BELT .

Courtesy of BMW OF NORTH AMERICA, INC.

Pull vacuum hose (1) off of coolant pump (2).

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Remove the belt pulley (2).

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1 - 4).

Remove coolant pump.

Preparation for installation: 

Courtesy of BMW OF NORTH AMERICA, INC.

Clean sealing surface (1).

Courtesy of BMW OF NORTH AMERICA, INC.

If a sealing bead (1) protrusion is present and not damaged, coolant pump can be installed again with the existing sealing bead (1).

If sealing bead (1) is damaged, it must be removed.

Apply SEALING COMPOUND 2.2 (Loctite 5970).

Sealing compound height approx. 2 mm - 2.5 mm.

Guide sleeve (2) must not be damaged.

Moisten sealing ring (3) with coolant.

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Position coolant pump.

Tighten screws in the sequence (1 - 4).

Tightening torque 11 51 1AZ .

Attach vacuum hose (1) to coolant pump (2).

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

When reusing the screws, clean the threads and coat with LOCTITE 243 !

Attach belt pulley (2).

Abut screws (1).

Install DRIVE BELT .

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten screws (1).

Tightening torque 11 51 7AZ .

Courtesy of BMW OF NORTH AMERICA, INC.

Required follow-up work: 

• Install ACOUSTIC COVER AT FRONT .
• Add COOLANT .
• Check engine for leak tightness