New Door Fits Badly and Technician Wants to Grind the Striker
A 2016 compact sedan has a new aftermarket right front door fitted after a side impact. The original hinges were reused and the striker is new. The vehicle is on a two-post lift with the wheels hanging. The door latches only if the technician lifts it about 8 mm by hand. The front gap at the A-pillar is 7 mm at the top and 4 mm at the bottom. The rear gap at the B-pillar is 2 mm at the top and 6 mm at the bottom. The beltline at the rear is 5 mm high, and the rear edge stands 4 mm proud of the rear door. The front edge is flush. The technician proposes grinding the latch striker to make the door close, then filling the gaps with body filler before paint. The workshop manual gives a door gap of 4.5 to 5.5 mm and says the vehicle must be on its wheels at kerb weight for adjustment. The opposite left door has even 5 mm gaps. The aperture diagonals have not been measured.
1. Evaluate the technician proposal. What checks must be made before any adjustment?
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Do not grind the striker or fill the gaps. The striker only holds the door closed; grinding it changes latch engagement and can let the door open in a crash. Body filler in a door gap will crack and is not a gap adjustment. Before touching anything, put the vehicle on its wheels at kerb weight as the manual requires; a two-post lift with hanging wheels changes the aperture. Check hinge pins and bushes for play, hinge mounting for movement, the new door shell for correct dimensions, the latch and striker for wear, and the aperture diagonals. Compare with the undamaged left door. The 8 mm lift needed to latch points to hinge height or door rotation, not just the striker.
2. Give a logical adjustment sequence and explain what the gap pattern tells you about hinge versus striker adjustment.
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Sequence: support the door, mark the current hinge positions, loosen the hinges slightly, and adjust the rear edge and beltline first because the rear gap and beltline are set by the hinge position. The front gap at the A-pillar is then checked; if the front gap is wide at the top and the rear gap is tight at the top, the door is rotated or the hinges are worn, so the top hinge may need shimming or the door may need twisting only if the shell is proven correct. Set the front and rear gaps within 4.5 to 5.5 mm, then adjust the striker in and out and up and down so the latch engages without lifting. Never use the striker to pull a misaligned door into place. Recheck the beltline with a straight edge and check the door closes with normal force.
3. If the aperture diagonals are wrong, what should happen next and why is filler not an acceptable answer?
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If the aperture diagonals differ from the manual or the left side, or the hinge pillar shows distortion, stop. The door cannot be aligned to a distorted aperture by hinge adjustment. Measure datum points and compare diagonals; if the shell is sound, fit a known-good door for a test. If the aperture is out, the vehicle needs structural pulling and a dimensional check before the door is refitted. Grinding the striker or filling gaps would hide a structural problem and fail inspection.