Steering - Drift/Pull
Article No. 85-19-15STEERING - DRIFT/PULL CASTER SPLIT ADJUSTMENT
LIGHT TRUCK 1980-86 F250-350 4x2; 1976-86 E100-350
A side-to-side front wheel caster difference greater than 3/4 degree can contribute to a vehicle drift or pull in the direction of the side with less caster. The service kit (E5TZ-3K064-A) can be used to increase the front wheel caster angle on either or both wheels to balance the caster split to correct a vehicle drift/pull concern. The kit contains complete parts and instructions needed to modify the front radius arm and mount a metal cam on the bottom flange of the radius arm. The kit can increase caster from 1/2 degree to 3 degrees, in 1/2 degree increments. It is not designed to decrease caster.
To increase front wheel caster angle of subject vehicles and/or to balance a caster split, the following procedure is suggested:
1. Remove the radius arm from the vehicle as shown in Section 14-21 of the Reference Shop Manual and choose the appropriate paper template applicable to the vehicle model.
Figure 8 - POSITIONING TEMPLATE TO LOWER FLANGE OF RADIUS ARM:
2. Locate the template (3B474) on the bottom flange of the radius arm. Refer to Figure 8 for a typical arm modification for the right hand radius arm. One template per vehicle model is used to modify both the right and left hand radius arms. When modifying the right hand arm, position the template with the printed side downward. The template locates off of one of two existing holes in the radius arm. The E100-350 template is shaped to match the contours of the radius arm.
Figure 9 - HOLE DRILLING INSTRUCTIONS - CAM ATTACHMENT TO LOWER FLANGE RADIUS ARM:
3. With template secure, make a punch mark at the center of the small hole inside the printed circle. Scribe the slot printed/cut-out on the template and die-grind out the slot at the axle-attaching hole the same size as the slot in the template and de-burr the surface avoiding rounding the edges of the slot. Refer to Figure 9.
Figure 10 - ATTACHMENT OF ADJUSTING CAM TO RADIUS ARM:
4. Drill a 0.228 inch diameter hole at the punch mark. Use this hole to mount the adjusting cam with the 1/4-20 self-tapping screw supplied. Refer to Figure 10.
5. Figure 10 shows a typical cam installation. Each hole in the cam represents a 1/2 degree caster increase. A caster increase of approximately 2 degrees for the E100-350, for example, will be obtained by mounting the cam with the selftapping screw in the No. 2 hole of the cam to the lower flange of the radius arm.
Figure 11 - TYPICAL INSTALLATION - FRONT AND RADIUS ARM:
6. Figure 11 shows a typical vehicle installation. TORQUE BOLT "A" AND NUT "B" TO 270-330 FT. LBS. When increasing caster 2 degrees or more, the ears of the radius arm should be bent upward slightly to help install and seat the axles. Do not use heat to bend.
7. Reset front wheel toe after installation is complete. AFTER THE DESIRED ALIGNMENT IS ASSURED THE CAM MUST BE WELDED TO THE ARM ARC WELD ONE INCH MINIMUM LENGTH ALONG TWO SIDES OF THE CAM.
NOTE: The metal adjusting cam plate has a Ford logo stamped on it to identify it for E100- 150 and F250-350 4x2 vehicles only on vehicles with a front stabilizer bar. The bar mounting bracket may be reworked to provide clearance for the self-tapping screw. Do not use parts from kit E4TZ- 3K064-A on these vehicles.
PART NUMBER PART NAME CLASS
E5TZ-3K064-A Kit Caster Adjustment C
OTHER APPLICABLE ARTICLES: 85-13-12
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP3360B85L
TIME: Left - F Series: 2.4 Hrs.
Econoline: 2.8 Hrs.
OPERATION: SP3360B85R
TIME: Right - F Series: 2.4 Hrs.
Econoline: 2.8 Hrs.
OPERATION: SP3360B85T
TIME: Both - F Series: 3.8 Hrs.
Econoline: 4.6 Hrs.
OPERATION: 3001A
TIME: 0.5 Hr. - Check caster camber and toe-in DLR. CODING: Basic Part No. 3A360 - Code: 36