BMW X5: Corrosion Protection
NOTE: Following repairs, the corrosion protection work already begins with the correct removal of the PVC undercoating, antinoise compound and seam seals.
1.0 Removing sealing materials:
IMPORTANT:
- Do not burn off PVC material with a gas burner or similar or heat to temperatures above 180ºC. This would generate highly corrosive hydrochloric acid and release harmful fumes.
- The new lining does not form a satisfactory bond with burnt PVC material which means that subsequent sub-surface rust may set in.
Remove PVC material with a rotating steel brush, or heat PVC to maximum 180ºC with a hot air blower and scrape off with a spatula.
2.0 Corrosion protection of sheet-metal parts:
All weld joints sealed off with body sealing compound in original state must be primed and sealed off again thoroughly after repairing. Replace damaged or removed antinoise compounds.
NOTE: Spray gun required for body sealing compound (order no. 81 49 0 300 887).
Concluding cavity protection is the most important part of all corrosion protection measures.
Use the cavity protection spray only for smaller-scale straightening work where the parts in question are easily accessible. Use the HRS spray gun with pressure container for all other repairs. Cavity protection agent is available in different container sizes.
Use the relevant probes with tubes for the different cavity areas.
Required tools are featured on the WORKSHOP EQUIPMENT PLANNING CD (WEP).
IMPORTANT: Incorrectly performed cavity protection can, especially in the case of steel/aluminum joints, give rise to a non-calculable product liability and safety risk.
The best repair is worth nothing if the subsequent cavity protection measures are not conscientiously carried out.
2.1 Cavity protection of steel parts:
New doors and lids must be sealed with cavity protection agent after being painted.
New sheet-metal parts or cavities, weld seams and folds formed by new sheet-metal parts must be sealed with cavity protection agent after being painted.
The cavities affected must be sealed with cavity protection agent after all straightening work.
2.2 Cavity protection of aluminum parts:
New doors, lids and side panels made of aluminum are not sealed with cavity protection agent.
After all straightening work on aluminum components, the cavities affected must be sealed with cavity protection agent after being painted.
After all welding work (E52 only) on aluminum components, the cavities affected must be sealed with cavity protection agent after being painted.
Cavities, seams and folds formed from new sheet-metal parts must be sealed with cavity protection agent after being painted.
READ NEXT:
Frame Alignment Control Dimensions, Body
Dimensions in mm.
Measurement tolerances:
< or = 1000 mm +- 1.5 mm
> or = 1000 mm +- 2.5 mm
The control points shown serve to check the body and the straightening
attachment.
The specifie
Gap Dimensions, Body
The dimensions specified in this document are applicable at an object
temperature of 20ºC. The aim of
adjustment is to achieve a uniform join.
Symmetry of the gaps between left and right sides of t
General Cementing Instructions
IMPORTANT: Conform with safety precautions !
The bonding surfaces must be kept free of all types of dirt and
contamination. Avoid leaving fingerprints.
Cleanliness is the golden rule for all bond
SEE MORE:
Removing And Installing/Replacing Carbon Canister
Necessary preliminary tasks:
Remove rear right wheel arch trim.
Unlock quick-release fasteners (1) and disconnect vent lines.
Release screws (2) and remove carbon canister (3).
Installation:
Tightening torque 16 13 1AZ.
Fig. 27: Identifying Quick-Release Fasteners, Screws And Carbon Canister
RE
Fuel Volume Testing
Some driveability concerns are related to incorrect fuel volume. Vehicles
with lack of power complaints and
mixture related fault codes may have insufficient fuel volume supplied to the
fuel injection system. These
vehicles may actually pass a fuel pressure test.
Fuel volume issues can be caused
