Adjusting left or right front side window (M4 Coupe)

Special tools required: 

• 51 0 341
• 51 0 342
• 2 351 398
• 2 304 553
• 51 3 240

Configuring the correct setting will fulfil the following properties: 

• Seal against water ingress
• No wind noise
• No rattling
• No unintentional reversing of side window during closing action (anti-trap safety function)

Prerequisites for correct adjustment: 

• Vehicle is supported on wheels at ground level
• FRONT DOOR correctly adjusted to fit
• Recharge the BATTERY (observe notes regarding lithium ion battery)

  (Full operability of the power windows during the adjustment procedure is only assured with an external power supply)

Attention! 

When closing, the door window glass must not jam on the trim strip in any area of the window (window glass breakage).

When performing measurement and adjustment work, do not slam the door (window pane may shatter).

Observe the checking and adjustment sequence!

1. Door window glass preload
2. Door window glass retraction depth/longitudinal direction

1. Preload 
   1. Preparations 

      Open door; move door window pane into uppermost position, if necessary.

      Insert special tool 51 0 341 in rotary striker of door lock and manually lock rotary striker (short lift activation).

      Close the door carefully up to the point where the special tool 51 0 341 magnetically adheres to the striker (defined door opening angle for measurement).

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   2. Preload ideal setting 
      NOTE: No force must be exerted on the door or door window pane during measurement.

      Bring special tool 51 0 342 into contact with window guide gasket (1) and door window (2).

      Determine dimension for preload between window guide gasket (1) and outer edge of door window (2).

      Dimension = 27 ±1 mm

   3. 1.3 Adjust preload 

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      Open door and remove sealing cap on door window frame.

      Thread in special tool 2 351 398 into door and position on nut (1) and guide (2).

      Slacken nut (1) with knob (3).

      Turn lever (4) to adjust preload and tighten nut (1).

      Tightening torque 51 33 2AZ .

      Check adjustment, repeat procedure if necessary.

      Remove special tool 51 0 341 from rotary striker of door lock.

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2. Retraction depth/longitudinal direction 
   1. Retraction depth/longitudinal direction ideal setting 

      Open door.

      Connect special tool 2 304 553 to measuring points (A to C) on side window.

      Close door.

      Measure longitudinal direction (A) and retraction depth (B and C) (refer to next procedural step).

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      Area	Dimension	Position of special tool 2 304 553
      A	19 ±1 mm	Centrally on mirror triangle
      B	5.5 ±1 mm	30 to 40 mm above exterior mirror
      C	7 ±1 mm	60 to 70 mm in front of outer edge of door window glass

      IMPORTANT: Door must open and close without the door window glass touching the roof trim strip (risk of damage).
      NOTE: Special tool 2 304 553 rest against edge of side window without play for each measurement.

      To correctly determine the dimension, transfer edge of profile seal (1) with special tool 51 0 342 to scale perpendicular to special tool 2 304 553.

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   2. Adjust retraction depth/longitudinal direction 

      Remove WEATHER STRIP  on outside of front door.

      NOTE: Avoid damaging door window glass and window cavity through tool use.

      When configuring setting, ensure that all special tools 2 304 553 continue to touch edge of door window pane without any gaps.

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      Attach siphon to center of side window.

      Slacken multipoint head cap screw (1)51 3 240 with special tool until side window with siphon can just be moved with little effort.

      NOTE: Always slacken both multipoint head cap screws to avoid tension in the power window system.

      Adjust longitudinal direction and retraction depth of door window glass.

      Tighten multipoint head cap screws (1) using special tool 51 3 240 and torque wrench.

      Tightening torque 51 33 3AZ .

      IMPORTANT: Do not release or tighten multipoint head cap screws over inside of door (disassembled door trim panel; threaded bolt may snap).
      Check adjustment, repeat procedure if necessary.

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      NOTE: Checking run-in of door window glass:

      Door window glass must strike the inside of the gasket.