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Home >> BMW >> 2021 >> 840i 2D Convertible >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Body Equipment -- Repair (2 Of 3) (G14, G15, & G16) >> 51 31 Windshield And Rear Window >> Removing windows with an oscillating knife REP-REP-RAGRP51-5131H02-V.3

Removing windows with an oscillating knife REP-REP-RAGRP51-5131H02-V.3

WARNING: Follow safety instructions. Refer to SAFETY INSTRUCTIONS FOR WORKING ON VEHICLES WITH AIRBAG SYSTEMS for working on vehicles with airbag systems (risk of injury).
IMPORTANT: Handle sharp-edged tools with care (risk of damage to the head airbag and the window glass).
IMPORTANT: Follow the vehicle-specific repair instructions!

Always wear safety goggles and protective gloves for your own safety.

Cover the working area (side walls, roof-mounted antenna and if necessary, interior equipment) with protective covers.

Tape off body with fabric adhesive tape (e.g. Tesa) in areas where the oscillating knife could damage the window glass or the paint.

Use SUCTIONING CUPS (51 3 010) to lift out the window glass.

Always keep both suction cups dry and clean to ensure optimum adhesion on the windshield.

Secure window glass against falling out.

G15650367Courtesy of BMW OF NORTH AMERICA, INC.

Depending on the area of application, knife 1 or 2 is used.

  1. Straight knife with adjustable thrust roller
  2. U-shaped knife

Dimension (X) on the knife (1) can be adjusted individually, see vehicle-specific repair instructions.

NOTE: Sharpen knife blade before every use on a running machine with a grinding stone (even with new knife blade).
G15650368Courtesy of BMW OF NORTH AMERICA, INC.

Removing from the inside: 

Guide knife carefully between body and window glass.

Run blade of knife parallel to glass.

Take care not to damage paintwork.

Cut through adhesive bead all the way around.

Pull window glass outwards to remove.

G15650369Courtesy of BMW OF NORTH AMERICA, INC.

Removal from outside: 

Guide knife carefully between body and window glass.

Run blade of knife parallel to glass.

Take care not to damage paintwork.

Cut through adhesive bead all the way around.

Pull window glass outwards to remove.

G15650370Courtesy of BMW OF NORTH AMERICA, INC.

Cut through adhesive bead as closely as possible to window glass.

  1. Body aperture
  2. Adhesive bead
  3. Knife
  4. Window
G15650371Courtesy of BMW OF NORTH AMERICA, INC.