Steering - Pulling or Drifting
^ STEERING - PULL OR DRIFT - CASTER Article No.ADJUSTMENT SERVICE KIT 87-4-16
^ SUSPENSION - FRONT - CASTER ADJUSTMENT SERVICE KIT
LIGHT TRUCK 1980-86 F-150 (4x4), BRONCO
ISSUE: A steering drift or pull may be caused by excessive front wheel side-to-side caster angle differences.
ACTION: If a front axle alignment check shows excessive (more than 3/4 degree split) side-to-side caster angle difference causing the vehicle to drift or pull, install a new caster adjustment kit (E0TZ-3K064-A) which allows the front axle side-to-side caster angles to be changed up to 2-1/2 degrees in 1/2 degree increments. New front axle to radius arm brackets must also be replaced when the caster kit is installed. Refer to the following service procedure for step-by-step instructions.
NOTE THE FOLLOWING INFORMATION BEFORE DOING WORK ON THE VEHICLE.
To correct caster side-to-side difference of up to 1- 1/2 degrees, install a caster adjuster plate on the radius arm that has the lower caster reading. Adjuster plates are identified R.H. and L.H.
To correct caster side-to-side difference more than 1-1/2 degrees, install the caster plate on both radius arms. Installing both plates will allow a caster split change of 2-1/2 degrees (+1-1/2 degrees on the low caster side, -1 degree on the high caster side).
1. Remove radius arm from vehicle.
Figure 14 - Article 87-4-16:
2. Locate the template, included in the kit, on the bottom flange of radius arm over the existing holes, as shown in Figure 14.
NOTE: Right arm adjustment is shown. One template is used to modify both right and left hand arms. When modifying right arm, position template with printed side down (printed side up for left arm).
Figure 14 - Article 87-4-16:
Figure 15 - Article 87-4-16:
Figure 16 - Article 87-4-16:
3. With template secure, punch mark radius arm at the small hole in the template, as shown in Figures 14 and 15. Mark radius arm, and diegrind a slot at the axle attaching hole the same size as the slot in the template, see Figure 16. De-burr the surface; avoid rounding the edges of the slot.
Figure 13 - Article 87-4-16:
4. Use a No. 6 drill to make a .204 inch diameter through hole at the punch mark. Line up the caster adjuster plate on the radius arm to obtain the required change in caster, see Figure 13.
Figure 17 - Article 87-4-16:
NOTE: Each hole changes caster approximately 1/2 degree + or - from the "0" index hole.
5. Install the tap screw to 120 in.lbs. (13 N-m) torque.
6. Reinstall radius arm with a new bracket (front axle to radius arm). The new bracket has a larger "jaw" spacing to fit over caster adjuster plate.
^ For non-quad shock vehicles, install bracket E7TZ-3B446-A.
^ For quad shock vehicles, install bracket E7TZ-18112-A, R.H. or E7TZ-18113-A, L.H.
Figure 18 - Article 87-4-16:
7. Tighten upper stud/bolt to 240-260 ft.lbs. (325-352 N-m) torque, Figure 18.
8. Tighten lower bolt to 320-340 ft.lbs. (434-461 N-m) torque, Figure 18.
9. Tighten front axle radius arm bracket bolts to 20-26 ft.lbs. (27-35 N-m) torque, Figure 18.
10. Arc weld caster adjuster plate to radius arm with a 1/4 inch-long bead along two sides of the plate.
11. Reset toe to specification.
PART NUMBER PART NAME CLASS
E0TZ-3K064-A Caster Kit CG
E7TZ-3B446-A Bracket - Radius Arm C
E7TZ-18112-A Bracket - Radius Arm CG
E7TZ-18113-A Bracket - Radius Arm CG
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
OPERATION: SP870416A - Caster kit one side
TIME: 2.1 Hrs.
OPERATION: SP870416B - Caster kit both sides
TIME: 3.5 Hrs. DLR. CODING: Basic Part No. FRONT - Code: 07