Alternate Headlamp Aiming Procedure

TOOL REQUIRED:
J 25300-E Headlamp Aimer

IMPORTANT
^ When using headlamp aiming equipment which attaches to the headlamps with a suction cup type devise, DO NOT LEAVE THE HEADLAMPS ON while the equipment is attached. On vehicles with "plastic" headlamps (body styled composite or sealed beam) having the headlamps illuminated when the equipment is attached, may cause heat build-up combined with the suction cup may cause the plastic headlamp lens to become distorted, requiring lamp replacement.

1. Prepare vehicle for checking beam aim as follows:
A. Completely assemble all components on vehicle.
B. Place vehicle on level surface.
^ Vehicle must be level. If necessary, pads may be used on uneven floors.
C. Stop all other work on vehicle.
D. Close doors.
E. Rock vehicle sideways to stabilize suspension.

NOTICE: Horizontal aim of headlamp capsule must be done first. Adjusting vertical aim first will result in incorrect headlamp aim.

2. Assure horizontal adjuster is set to "0" (zero) mark:
A. If vehicle has been damaged, refer to Headlamp Aiming After a Collision.
B. If horizontal pointer is not set at "0" (zero), turn horizontal aiming adjustment screw until pointer is lined up with "0" (zero).
3. Adjust vertical aim by turning vertical aiming screw until bubble in level is centered at "0" (zero).
^ If fuel tank is near empty to 1/4 full, adjust aim to center bubble at -0.4 degrees. This will reduce the chance of raising the headlamp capsules into oncoming driver's eyes when the fuel tank is filled.

If a headlamp testing machine is used, it should give results equivalent to those obtained using the screen method. It should he in good repair and adjustment, and should be used in accordance with the manufacturer's instructions. The machine using a photoelectric cell or cells to determine aim should also have a visual screen upon which the beam pattern is projected proportional to its appearance and aim on a screen at 25 feet. Such visual screen should be plainly visible to the operator and should have horizontal and vertical reference lines to permit visual appraisal of the lamp beam.

1. Prepare vehicle for checking beam aim as follows:
A. Completely assemble all components on vehicle.
B. Place vehicle on level surface.
^ Vehicle must be level. If necessary, pads may be used on uneven floors.
C. Stop all other work on vehicle.
D. Close doors.
E. Rock vehicle sideways to stabilize suspension.
2. Install headlamp aimer J 25300-E to headlamp.
3. Calibrate mechanical aimers (conforming to SAE J1602):
A. Set master fixture to "0" U/D and "0" R/L.
B. Calibrate aimers on master fixture to read "0" and "0" R/L.
Inspect
^ Horizontal aim using horizontal adjusting screw.
- 102 mm (4 inches) left to 102 mm (4 inches) right.
^ Vertical aim using vertical adjusting screw. -- 51 mm (2 inches) up to 64 mm (2.5 inches) down.

IMPORTANT
^ Aim-adjusting tools should be carefully selected since one full turn of an adjusting screw will move the aim approximately 89 mm (3.5 inches) when measured at 25 feet.