Outer Body Panel Removal, Replacement, and Alignment
What this domain tests
This domain tests removal, replacement, and alignment of outer body panels such as doors, fenders, hoods, and quarter panels. The exam checks attachment knowledge, gap and flush, trial fitting, and corrosion protection.
Core rules
- Identify the attachment before cutting: squeeze-type resistance spot welds, adhesive, hem flange, bolts, or a mix.
- Door skins are hemmed and often bonded; fenders and hoods are usually bolted; quarter panels may be welded or bonded.
- Align in sequence: hinges and mounting points first, latch or striker last; check gaps and flushness to adjacent panels before final tightening.
- Trial-fit the panel, check operation, and verify gaps at multiple points; do not stretch holes or force a panel into position.
- Restore E-coat, seam sealer, and cavity protection after installation; replace one-time fasteners and clips.
Worked example
A door skin is crushed but the door shell is sound. The technician removes the hem, cleans the flange, applies OEM-specified adhesive, installs the new skin, hems it, and checks gaps before final sealing. Reasoning: the shell carries the hinge and latch loads; the skin is cosmetic, so the repair must restore the hem and corrosion protection, not just appearance.
Traps
Adjusting the latch before hinges; aligning to a damaged adjacent panel; reusing one-time fasteners; leaving bare metal at hems; forgetting seam sealer; assuming a panel is aligned because it closes.