Bearing Preload

Use Spacer Selector Set (T87C-1104-B) to check and adjust preload. Install spacer selector into steering knuckle and clamp tool in vise where shock absorber mounts, before installing hub/rotor assembly into steering knuckle. See Fig 1 .

Fig 1: Installing Preload Spacer Selector Set
Courtesy of FORD MOTOR CO.
Tighten center bolt from spacer selector set, in increments, to 36, 72, 108 and finally 145 ft. lbs. (49, 98, 147 and 196 N.m). Each time center bolt is tightened, seat bearings by rotating hub by hand. Using an inch-pound torque wrench, measure torque required to turn center bolt. Ensure torque reading is taken just as wrench starts to rotate.
Preload spacer thickness is correct if torque wrench indicates 2.2-16 INCH lbs. (.25-1.8 N.m). If measurement indicates less than 2.2 INCH lbs. (.25 N.m), a thinner spacer must be installed. If measurement indicates more than 16 INCH lbs. (1.8 N.m), a thicker spacer must be installed.
Bearing spacers are available in various thicknesses. See PRELOAD SPACER AVAILABILITY table. Changing spacer thickness one number changes bearing preload 1.8-3.5 INCH lbs. (.2-.4 N.m). Ensure correct spacer is installed and preload is within specification. Remove preload spacer selector set.

PRELOAD SPACER AVAILABILITY