51 21 090 Removing And Installing/Replacing Door Lock In Left Or Right Front Door (From 09/00)

A 4 mm WAF Allen key is required for adjustment.

Necessary Preliminary Tasks: 

• Remove acoustic insulation. Refer to 51 48 ... REMOVING AND INSTALLING/REPLACING SOUND INSULATION IN LEFT OR RIGHT FRONT DOOR (CONVERTIBLE, COUPE) .

Driver's side only:

• Remove complete lock cylinder. Refer to 51 21 140 REMOVING AND INSTALLING/REPLACING COMPLETE LOCK CYLINDER IN LEFT OR RIGHT FRONT DOOR .

Coupe/Convertible Only: 

• Remove rear section of power window unit. Refer to 51 33 000 REMOVING AND INSTALLING/REPLACING POWER WINDOW UNIT IN LEFT OR RIGHT FRONT DOOR (CONVERTIBLE, COUPE) .

Disconnect plug connection (1) on door lock (2).

Fig 1: Disconnecting Plug Connection On Door Lock

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Lever out Bowden cable (1) from holder (2) with screwdriver.

Unhook Bowden cable nipple (3) from lever (4).

Fig 2: Disconnecting Bowden Cable From Holder With Screwdriver

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Release screws (1).

Remove door lock (2) with linkage (3).

Installation: 

Insert linkage for locking knob through opening in inner door plate.

Do not bend linkage (3).

Replace screws (1).

Tightening torque, refer to 51 21 1AZ in BODY EQUIPMENT - TIGHTENING TORQUES - 3-SERIES .

Fig 3: Removing Door Lock With Linkage

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Installation: 

Left door lock of front door:

Slacken adjusting screw (1) on door lock (2) (turn in counterclockwise direction, as shown in illustration) - this makes the Bowden cable mount (3) movable.

Fig 4: Identifying Door Lock Of Front Door

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Coupe/Convertible: 

For the Coupe, the door lock (4) is adapted to the different door geometry.

The illustration shows the left driver's door lock.

The adjusting procedure is identical to that for the Saloon.

Fig 5: Identifying Driver's Door Lock

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1. Bowden cable holder for outside door handle.
2. Adjusting screw (4 mm WAF).
   Fig 6: Adjusting Screw

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Installation: 

Right door lock of front door:

Slacken adjusting screw (1) on door lock (2) (turn in clockwise direction, as shown in illustration) - this makes the Bowden cable mount (3) movable.

Fig 7: Removing Sealing Cap

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Coupe/Convertible: 

Lever out sealing cap (1) for following adjustment.

Installation: 

After installing lock cylinder (51 21 140) and/or cover (51 21 180), lever out sealing cap (2).

Tighten down adjusting screw (2) on door lock and fit sealing cap (1).

Tightening torque, refer to 51 21 4AZ in BODY EQUIPMENT - TIGHTENING TORQUES - 3-SERIES .

Fig 8: Identifying Sealing Cap

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Direction Of Rotation Of Adjustment Screw (1): 

Fig 9: Identifying Close Rotary Striker Lock

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Checking Unlocking Of Rotary Striker Lock: 

• Close rotary striker lock (1) with a screwdriver,
• Lock car with car key,
• Unlock Car With Car Key,
• Open rotary striker lock (1) with outside door handle,
• If rotary striker lock (1) opens, then O.K.
• If rotary striker lock (1) fails to open,
• Slacken adjustment screw (2) again,
• Retighten adjusting screw (2),
• Carry out check again.

  Fit sealing cap.

  Fig 10: Identifying Outside Door Handle

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Checking Overtravel At Outside Handle: 

• Close rotary striker lock with a screwdriver,
• Open rotary striker lock with outside door handle (1),
• Outside door handle (1) must be able to open further by measurement (A),
• If measurement (A) is obtained, then O.K.
• If measurement (A) is not obtained, readjust rotary striker lock and carry out overtravel check,
• If measurement (A) is still not obtained, you must Bowden cable with carrier.

  (A) At least 2 mm.

Only replace:

Lift out lock (1) and detach Bowden cable (2) from fixture (3).

Remove Bowden cable nipple (4) from lever (5).

Fig 11: Removing Bowden Cable Nipple From Lever

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Only replace:

Turn linkage for locking knob (1) and detach from lever (2).

Fig 12: Turning Linkage For Locking Knob

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Installation: 

Following parts must not be damaged:

1. Mount for paddle of lock barrel (driver's side only).
2. Mount for Bowden cable of outside door handle.
3. Mount for Bowden cable of inside door handle.

   The illustration shows the left driver's door lock on the Saloon.

   Fig 13: View Of Driver's Door Lock Components (Saloon)

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Installation: 

Following parts must not be damaged:

1. Spring.
2. Mount for Bowden cable of inside door handle.
3. Mount for linkage of locking knob.
4. Mount for paddle of lock barrel (driver's side only).

   The illustration shows the left driver's door lock on the Coupe.

   Fig 14: View Of Driver's Door Lock Components (Coupe)

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