Frame Repairs
FRAME REPAIRSMaterial:
Material
Welding Precautions
NOTE: Whenever factory E-coat has been removed by sanding, grinding or weld burn-off, the coating must be restored.
1. If welding must be done on a frame, make sure the following requirements are met:
- If the frame is attached to the vehicle, the battery ground cable must be disconnected before using any electrical welding equipment.
- Do not use gas welding equipment.
- Use a temperature-indicating crayon to make sure that the temperature does not exceed 750°C (1,400°F).
- Install new spot-welded components by spot welding where possible. If spot welding is not possible, use puddle welding.
Frame Straightening
WARNING: Straightening of front frame rail convolute is prohibited. Failure to follow these instructions may result in personal injury.
CAUTION: Straightening of severely bent or kinked frame components is prohibited. However, before removing these components, restore dimensionally to a pre-collision condition.
NOTE: Whenever factory E-coat has been removed by sanding, grinding or weld burn-off, corrosion protection must be restored.
1. If heat is needed to straighten a frame member, keep the temperature below 650°C (1,200°F) (a dull red glow). A temperature sensitive thermal melt crayon should be used to monitor heat buildup.
- Heat should be kept to a minimum area so that the hardness of the metal will not be affected.
- Straightening should only be attempted on frames that fail to meet specifications, or where damage is apparent.
- Straightening should be limited to parts which are not severely bent.
- Reposition or shield any fuel lines, brake lines or wiring harnesses or components in heated area.
Underbody Misalignment Check
NOTE:
- Underbody misalignment can be the result of damage or loose frame components. It can affect front and rear wheel alignment and cause incorrect operation and abnormal wear of tires and chassis parts.
- For additional information, refer to Body, for dimensional data when carrying out repairs on the frame. Body System - General Information
1. Inspect the frame for damage and loose parts before checking the frame alignment.
- Inspect all cross members for cracks, twists or bends.
- Inspect all of the welded connections for cracks.
- Check all of the support brackets for looseness.