Over-Center Preload

With worm bearing preload adjusted, turn worm shaft slowly from stop to stop while counting total number of turns. Then, turn shaft half-way back to exact center position. Loosen lock nut and turn over-center adjustment screw in until all lash is taken out of shaft. Tighten lock nut.
Rotate worm shaft slightly off center (45-90°), then attach an INCH Lbs. torque wrench to worm shaft. Using torque wrench as a lever, rotate worm shaft back through center position and record rotating torque. If rotating torque is not to specifications, repeat procedure. Final rotation of adjustment screw must be clockwise; therefore, if maximum specification was exceeded, screw must be backed out, then rotated in (clockwise) to approximate new setting.

OVER-CENTER ADJUSTMENT

Application

Over-Center Preload⁽¹⁾

Maximum Total

Chrysler Corp.

"B" & "PB" Models

6-7

11.5

All Other Models

5-8

Ford Motor Co.

"E" Models

5-8

"F" Models

3-8

General Motors

"G" Models

5-11

"C" & "K" Models, P10 & 1500

4-10

P20, 30, 2500, 3500

9-13

International Harvester

4-10

Jeep

4-10

⁽¹⁾	Amount in excess of worm bearing preload.

Fig 1: Cross Section View Of Steering Gear

Courtesy of NOT AVAILABLE