51 21 090 Removing and installing/replacing door lock in left or right front door

Special tools required:

51 2 190

Necessary preliminary tasks:

Remove SOUND INSULATION IN FRONT DOOR

Disengage Bowden cable (2) from outer door handle at marked position.

Installation note:

Driver's side only:

Make sure locking pin (1) is correctly seated in mounting of door lock (3).

Fig 1: Disengaging Bowden Cable From Outer Door Handle

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Lever out locking rod (1).

Unfasten plug connection (2) and disconnect.

Release screws (3).

Fig 2: Plug Connection And Screws

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Only with driver's door:

Disengage door lock (1) at locking pin (2).

Installation note:

Make sure locking pin (2) is correctly seated in mount (3).

Fig 3: Door Lock And Locking Pin

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Turn door lock (1) as shown and maneuver out below door reinforcement (2).

IMPORTANT: Do not damage door lock seal (3) when removing (water ingress)!

Fig 4: Turning Door Lock

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Installation note:

Schematic diagram of removed support for outer door handle.

For it to be possible to install the door lock, locking pin (1) must be in the installation position on the support (2).

Fig 5: Installing Door Lock Locking Pin On Support

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Installation note:

Install door lock (1) and screw in screws (2) but to not tighten.

Slide special tool 51 2 190 into opened rotary striker until striker engages in first stage

Fig 6: Installing Door Lock And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Pre-tension door lock (1) with knurled screw (2) until special tool 51 2 190 just contacts corner points (3)

Fig 7: Door Lock, Knurled Screw And Special Tool (51 2 190)

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: To tension door lock (1), it is only permitted to tighten knurled screw (2) by a further 1 to 1.5 turns (max.) (risk of damage).
Door lock seal must rest uniformly on inner door panel (water ingress).
Tighten screws of door lock (1).
Observe tightening sequence: bottom - top - inner.
Tightening torque: 51 21 1AZ .