51 31... Instructions for window cementing (security)
Storage temperature of all adhesive products of 5°C to 25°C must be observed.
General:
The windscreen and rear window (also the rear side windows if necessary) are bonded to the body. This gluing will increase the torsional strength of the vehicle. To obtain perfect bonding, comply with the installation procedure described in the following.
It is possible to tow or drive without windscreen or rear window.
The windscreen must be secured with yellow plastic adhesive tape (sourcing reference: BMW Parts Service) after being installed. The paint must be completely hardened after painting work.
- Set down window glass and process on BMW-approved X-universal stand.
- In winter, the vehicles must stand in a room with a temperature of at least 15 °C.
On-the-job safety:
When working with adhesive products (adhesive, cleaning agent, bonding agent etc.):
- Wear protective goggles, protective gloves and if necessary an apron.
- Ensure rooms are well ventilated.
- Change work clothing contaminated with adhesive immediately.
- Change work clothing contaminated with solvents and swelling agents immediately (keep spare work clothing on hand).
- Take skin protection measures, provide washing facilities including hot water, use silicone-free skin creams
- Provide eye bath facilities, change water regularly (once a month).
- Comply with the relevant safety regulations
- Do not eat, drink or smoke in areas of PUR processing.
Replacement of windscreens:
Version with front passenger airbag:
- Stick on reminder label
Tools for cutting through adhesive bead:
| Type | Model | Order/part number | ||
|---|---|---|---|---|
| Special cutter (manufacturer: Fein) with oscillating blade | Pneumatically operated Electrically operated |
81 43 9 429 183 81 43 9 427 786 |
||
| BMW blade set | All required blades | 81 43 9 428 596 | ||
| Blade (U-shape) | 19.5 mm (1) 24 mm 36 mm 45 mm |
6 39 03 118 01 3 6 39 03 076 01 6 6 39 03 079 01 2 6 39 03 154 01 0 |
||
| Blade (straight with stop roller) | 16 to 35 mm (adjustable) 10 mm (fixed)(1) 14 mm (fixed) |
6 39 03 143 01 3 6 39 03 189 01 0 6 39 03 082 01 6 |
||
| Scalpel | for heavy-duty applications (1) | |||
|
||||
Storage temperature:
Storage temperature of all adhesive products of 5°C to 25°C must be observed.
Adhesive:
The BMW-approved 1-component polyurethane adhesive must be used for bonding.
- Adhesive cartridge (part number BMW 83 19 0 152 031)
Adhesive is applied to window glass with cartridge gun (pneumatically or electrically operated, sourcing reference: BMW Workshop Equipment and Planning Documentation).
Adhesive Best before date:
Repair kit and adhesive cartridges are marked with a date (Best before).
The adhesive cannot be used after this date.
Adhesive disposal:
Pure hardened adhesive is handled as normal waste.
The adhesive is disposed of in paper bags so that it can react with moisture.
Non-hardened adhesive, cartridges and mixtures of adhesive and solvents and the like must be disposed of as special waste.
Bonding agent (activator):
The BMW-approved bonding agents must be used to treat bonding areas:
- "Glass Activator 1" (on glass ceramic material)
- "Paint Activator A" (on sheet metal flange or residual adhesive bead)
Bonding agent Best before date:
Repair kit and bonding agent are marked with a date (Best before).
- The bonding agent may only be used up to this date (if not already opened previously).
- Once it has been opened (locking ring broken), use for 1 week only even if the Best before date has not been reached.
Write the date on the bottle when opening the bonding agent for the first time.
Close the bottle immediately after extracting the bonding agent (reaction with air).
Removal of window glass:
Cover side panels, roof antenna and if necessary interior trim with protective covers.
Tape off body with fabric adhesive tape (e.g. Tesa) in areas where the oscillating blade could damage the window glass or the paint.
When removing the windshield:
- Wear protective goggles and gloves.
Cut through adhesive bead of window glass:
- with oscillating blade
Prior to each use, regrind the blade with a grinding stone while the machine is running (new blades also).
Avoid damage to paintwork on body cutout.
Guide blade carefully between body and window glass.
Run blade of knife parallel to glass.
Cut through adhesive bead as closely as possible to window glass.
To remove adhesive bead in body cutout (and on window glass if reusing):
- Use a scalpel for heavy-duty applications
- Cut off residual adhesive to a thickness of approx. 0.5 mm
- Remove residual bead only briefly before bonding
Damage to paintwork in body aperture:
To ensure long-term corrosion protection, it is absolutely essential to touch up damage to paintwork!
The "BMW Color System" painting handbook forms the basis of these repair instructions and must be observed without fail.
Touch up damage to paintwork on body cutout with BMW multibase filler.
Grind out scratches in non-visible areas and touch up with BMW multibase filler.
Grind extensive areas of damage down to the bare metal and coat with BMW multibase filler (coating thickness 30... 40 μm).
Hardening time:
- With infrared, at least 10 minutes
- Without infrared for at least 60 °C, at least 30 minutes
- Without infrared for at least 20 °C, at least 24 hours
If a complete build-up of paint is required in the visible area:
- Tape off primed bonding flange before applying top coat
Observe hardening time of BMW multibase filler otherwise a perfect bond cannot be guaranteed!
Treatment of glued area in body:
| Glue | Treatment |
|---|---|
| Bonding and sealing compound for car window glass |
|
Do not use Sika remover 208 for cleaning in the bonding area.
Preparation for assembly:
Prepare plastic nozzle(s) for shaping adhesive bead (when not using the standard nozzle), can be cut to size during the air drying time.
Lay a test bead of approx. 50 mm - watch out for formation of bubbles/blisters when hot cementing; if OK, apply immediately to window glass.
- Interruption must be < 5 second (incorrect mixture ratio).
Cartridge must be vertical to window glass.
Black ceramic material impermeable to UV light is located on the peripheral zone of the inside edge of the window to protect the adhesive bead.
Glass ceramic material must not be damaged and must be treated as follows.
Treatment of glass ceramic surface (inside of window):
| Adhesive (with part numbers) | Treatment |
|---|---|
Cold cementing: Adhesive cartridge: |
|
Version with inspection window for vehicle identification number in windshield only (all except US/GB):
- Seal inspection window (bottom left) with Sika primer 206 G+P
Adhesive quantities:
Approx. 1 1/4 adhesive cartridges are needed to cement 7 Series windshields.
If a second cartridge is required for cementing:
Bubbling results in leakage and insufficient bonding strength (torsional rigidity, passenger airbag).
Effect of differing adhesive quantities:
| Too little adhesive: | Too much adhesive: |
|---|---|
|
|
Spacer buffers:
Before sticking on new spacer buffers, remove all remaining traces of old spacer buffers completely.
Position of spacer buffers must be observed exactly.
Incorrectly fitted spacer buffers will result in:
- Windshield glass breakage
- Wind noises
Assembly:
To prevent a pressure increase in the vehicle interior when the doors are closed:
- Open a window
After the adhesive bead has been applied, the window glass must be fitted within 5 to 10 minutes (depending on air humidity, temperature and use of accelerator).
After 5 to 10 minutes the adhesive bead forms a skin which can no longer guarantee a perfect bond.
The glass will slip down if other adhesive tapes are used.
Windshield slippage will result in leaks and wind noises.
Remove adhesive residue immediately with adhesive remover (Sika remover 208, sourcing reference: BMW Parts Service). Do not press out the window glass again.
Hardened adhesive can only be removed by machine.
Height of windscreen/rear window is determined by spacer buffers.
Assemble car.
Hardening:
The adhesive hardens as it reacts with air humidity (with accelerator also due to mixed-in reaction paste) at room temperature.
Minimum hardening time (table) is obtained from 22 °C and 38 % relative air humidity.
At ambient temperatures above 23 °C and 50 % relative air humidity (hot countries), the adhesive open time is shortened to approx. 5 minutes (skin formation time).
The adhesive hardening process is interrupted completely at ambient temperatures below 5 °C. In this event, there will be no increase in the strength of the adhesive bond.
Do not subject the vehicle to load on one side during the minimum hardening time (see table, without passenger airbag), such as e.g.:
- one wheel on curb
- lifting platform
- etc.
Maneuvering inside garage/workshop:
- only permitted on level ground
- do not under any circumstance drive over access ramps, e.g. into multi-store car parks
Remove adhesive tapes after hardening time.
If you fail to adhere to the minimum hardening times (see table, without passenger airbag):
- leaks and wind noises will occur when the windshield is moved
Glues and their minimum hardening times:
| Glue | Minimum hardening time "without passenger airbag" (after which vehicle can be moved) | Minimum hardening time "with passenger airbag" (countries where seatbelt use is not required by law) |
|---|---|---|
| Cold processing | 9 hours | 20 hours* |
Vehicles with passenger airbag:
The vehicle can be handed over to the customer after the hardening period (vehicle can be moved, adhesive dependent) with the following warning:
Once the windshield glass has been bonded, all occupants must travel with their seatbelts attached for "... hours"!
The time is taken from the "Minimum hardening period" table for countries where seatbelt use is not required by law.
If the minimum hardening time is not adhered to:
- the front passenger together with the windshield may fall out of the vehicle in the event of an accident after the front passenger airbag has been triggered
Locate leaks:
- by spraying water underneath sealing lips
- with ultrasonic leak detector (sourcing reference: BMW Parts Service)
If necessary, seal leakage with appropriate nozzle.
Version with fogging sensor:
Fogging sensor is not active.
Work steps for removing and installing windscreens:
Refer to REPAIR INSTRUCTIONS .