Front Door Latch: Service and Repair

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 door window glass

Driver's side only:
- Remove lock barrel lock barrel







Release cable from holder in area (1).
Release nuts (2) and lay down window lift rail (3) in door.
Tightening torque 51 33 2AZ.







NOTE: Graphic is similar.

Disconnect Bowden cable at bottom (1) and top (3) from door lock (2).

Installation note:
Bowden cable must be correctly engaged in locators in door lock (2).
Bowden cable must be laid without kinks in bend to door lock (2).
Seal (4) must be correctly fitted on Bowden cable.







IMPORTANT: If Bowden cable (1) is routed incorrectly, door can not be opened from the outside.

Lever out locking rod (1).
Unfasten plug connection (2) and disconnect.
Release screws (3).
Remove door lock from inside.







IMPORTANT: Seal (1) on door lock (2) must not be damaged (water ingress).







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







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

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).
Tightening torque 51 21 1AZ.