51 31 000 Removing and Installing/Renewing Windscreen (Page 321)

51 31 000 Removing And Installing/Renewing Windscreen

Special tools required:







IMPORTANT:
- Instructions on window bonding" serve as the basis for this repair instruction and must be observed without fail.
- Cover front side walls with protective covers.

NOTE: Removal is performed with Roll Out 2000. Only use an oscillating blade when replacing the windscreen.







Necessary preliminary work:
- Remove gutter strip on left and right
- Remove cover for cowl panel
- Remove inside mirror
- If necessary, remove solar rain/light sensor and condensation sensor
- Unlock and disconnect all plug connections on windscreen.







IMPORTANT: Tape off body in area of piercing point with fabric adhesive tape (1).

Push wire starter (2) from Roll Out 2000 through adhesive bead.







Only replace:
Mount U-shape blade (sourcing reference: BMW Parts Department) on tool:
24 mm blade length for sides and top
36 mm blade length for bottom and bottom/sides
Regrind blade with a grinding stone while machine is running (new blades also).
Carefully insert blade between body aperture and windscreen.
Guide handle of knife parallel to windscreen.
Cut through adhesive bead as closely as possible to windscreen.







NOTE:
- When cutting is carried out at the bottom, the engine compartment lid must be in the service position.
- Cables and hoses remain connected.

Move engine compartment lid into service position.
Cut through windscreen adhesive bead at bottom.
Lift out windscreen with special tools 51 3 010.
Pull off adhesive tapes all round.







Fitting spacer buffers (spacers):

IMPORTANT:
- To avoid windscreen breakage and wind noises:
- Completely remove remnants of removed spacer buffers (1) and (2) and maintain installation location exactly.

Spacer buffers (1), semicircular spacer buffers (2) must be mounted centrally so that they cover the embossed marks on sheet metal flange.

Installation note:
If necessary, replace defective expanding foam tape (1).







IMPORTANT: Just before the windscreen is installed, press the expanding foam tape (1) down using the special tool 51 0 300 or attach the expanding foam tape (1) again. An expanding foam tape (1) that has become relaxed could change the position of the adhesive bead and thereby lead to wind noise or windscreen leaks.

Overview for windscreen bonding (F25):







a1 = 23 mm 1 = bead joint (approx. 300 mm from edge of window glass)
a2 = 7 mm 2 = window glass corner (measuring point for a1)
x = 60 mm







If reusing removed windscreen, remove residual adhesive down to 0.5 mm.
If necessary, mount windscreen cover (top).
Spread bead joint (4) with special tool 00 9 322.







NOTE: Adhesive area for plastic adhesive tapes (1) must be free from grease and dust.

Stick two yellow plastic adhesive tapes (1) to roof at distance (A) from outside corners.
Length: 400 mm
A = 250 mm







Working on windscreen (1) carefully with special tool 51 3 010:
- position windscreen first at top
- Align sides evenly
- then insert at bottom and press down
- press upwards until seal rests evenly on roof
- secure in terms of height in this position at top with two yellow plastic adhesive tapes (2)







Preload on top of windscreen to prevent wind noise:
Windscreen (1) must be lower than roof outer skin (2). This is the only way to prevent wind noises.
Position special tool 51 0 010 in middle of vehicle depending on dimension (A) and check underprotrusion of windscreen (1).
Windscreen underprotrusion (A):
A = 3 ± 1 mm (without HUD)
2.5 ± 1 mm (with HUD)

X = Measurement stages 1... 4 mm