Panel Alignment and Body Measurement
What alignment means
Panel alignment is the relationship between panels: gap width, flushness and parallelism, plus the structural dimensions underneath. If the body shell is wrong, no amount of hinge adjustment will make the door fit.
Measurement
OEM body dimensions are quoted between control points, usually with a tolerance around ±3 mm. Tools range from a tram gauge and tape to a universal measuring system, laser and computer measuring. Always measure from undamaged control points and compare diagonals: equal diagonals mean a square aperture.
Alignment sequence
- Pull or repair the structure to specification first.
- Fit and align bolt-on panels to the structure.
- Hang doors, set gaps at the hinges, then adjust the striker last.
- Fit bonnet and boot, set gaps and flushness, check latches.
- Fit bumpers, lamps, grilles and trim, checking gaps as you go.
- Recheck every gap after paint and trim, because seals and film thickness change fit.
Worked example
A door is tight at the rear top and looks dropped. The hinge pin is worn. Adjusting the striker to make the latch catch will pull the door out of line at the front and damage the latch. Repair or replace the hinge, set the door at the hinges, then set the striker.
Traps
- Using the striker to fix hinge sag.
- Measuring to or from a damaged panel.
- Forcing a panel with a pry bar and cracking paint.
- Aligning before the structure is correct.
- Not checking gaps with the seals fitted.