Front Steering Knuckle: Service and Repair

REMOVAL - STEERING KNUCKLE (FRONT)

NOTE: Before proceeding with this procedure, Refer to Service Precautions.

1. Apply the brakes and hold in place.
2. Raise the vehicle.
3. Remove the front tire and wheel assembly.





4. Remove the cotter pin, lock nut and spring washer from the hub nut (Fig. 2).
5. While the brakes are applied, loosen and remove the hub nut (Fig. 2).
6. Release the brakes.





7. Remove the two guide pin bolts securing the front disc brake caliper to the steering knuckle (Fig. 3).
8. Remove the disc brake caliper from the steering knuckle. The caliper is removed by first tipping either the top (right side) or bottom (left side) of the caliper away from the brake rotor, then pulling the caliper off the opposite end's caliper slide (on the knuckle) and rotor.
9. Hang the caliper out of the way using a wire hanger or cord. Do not support the caliper by letting it hang by the hydraulic hose.
10. Remove any retainer clips from the wheel mounting studs. Remove the brake rotor from the front hub (Fig. 3).





11. Remove the nut attaching the outer tie rod to the steering knuckle. To do this, hold the tie rod end stud with a wrench while loosening and removing the nut with a standard wrench or crowfoot wrench (Fig. 4).





12. Remove the tie rod end from the steering knuckle using Remover, Special Tool MB991113 (Fig. 5).
13. Remove the tie rod heat shield.





14. Remove the nut and pinch bolt clamping the ball joint stud to the steering knuckle (Fig. 6).

CAUTION: The strut assembly-to-steering knuckle attaching bolts are serrated and must not be turned during removal. Hold the bolts stationary in the steering knuckles while removing the nuts, then tap the bolts out using a pin punch.

15. Remove the two bolts attaching the strut to the steering knuckle.

NOTE: Use caution when separating the ball joint stud from the steering knuckle, so the ball joint seal does not get cut.





16. Separate the ball joint stud from the steering knuckle by prying down on lower control arm and up against the ball joint boss on the steering knuckle (Fig. 7).

NOTE: Do not allow the driveshaft to hang by the inner C/V joint; it must be supported to keep the joint from separating during this operation.

17. Pull the steering knuckle off the driveshaft outer C/V joint splines and remove the steering knuckle.

NOTE: The cartridge type front wheel bearing used on this vehicle is not transferable to the replacement steering knuckle. If the replacement steering knuckle does not come with a wheel bearing, a new bearing must be installed in the steering knuckle. Installation of the new wheel bearing and hub must be done before installing the steering knuckle on the vehicle.

18. If the steering knuckle is to be replaced, the hub and wheel bearing must be removed. Do not reuse the wheel bearing.

DISASSEMBLY - WHEEL BEARING AND HUB

NOTE: The removal and installation of the wheel bearing and hub from the steering knuckle is only to be done with the steering knuckle removed from the vehicle. Removal of the wheel bearing from the steering knuckle must be done using the procedure.

1. Remove steering knuckle, hub, and wheel bearing as an assembly from the vehicle.

Part 1 Of 2:

Part 2 Of 2:

2. Using Remover, Special Tool 4150A (Fig. 8), press one wheel mounting stud out of hub flange. Rotate the hub to align the removed wheel mounting stud with the notch in bearing retainer plate (Fig. 9). Remove the wheel mounting stud from the hub.





3. Rotate the hub so the hole in the hub that wheel mounting stud was removed from is facing away from brake caliper lower rail on steering knuckle (Fig. 10). Install one half of the Bearing Splitter, Special Tool 1130, between the hub and the bearing retainer plate (Fig. 10).

NOTE: Align the threaded hole in this first half of the bearing splitter with the caliper rail on the steering knuckle (Fig. 10).





4. Install the remaining pieces of Bearing Splitter, Special Tool 1130, on the steering knuckle (Fig. 11). Hand tighten the nuts to hold bearing splitter in place on steering knuckle.





5. Once the bearing splitter in fully installed, be sure the three bolts attaching the bearing retainer plate to steering knuckle (Fig. 12) are contacting the bearing splitter (Fig. 12). The bearing retainer plate should not support the steering knuckle or contact the bearing splitter.





6. Place the steering knuckle in an arbor press supported by the bearing splitter as shown (Fig. 13).





7. Position Driver, Special Tool 6644-2, on the small end of the hub (Fig. 14). Using the arbor press, remove the hub from the wheel bearing. The outer bearing race will normally come out of the wheel bearing when the hub is pressed out of the bearing.
8. Remove the bearing splitter from the steering knuckle.





9. Remove the three bolts mounting the bearing retainer plate to the steering knuckle (Fig. 15). Remove the bearing retainer plate from the steering knuckle.





10. Place the steering knuckle back in the arbor press supported by press blocks as shown (Fig. 16). The press blocks must not obstruct the bore in the steering knuckle so the wheel bearing can be pressed out of the steering knuckle. Place Bearing Driver, Special Tool MB-990799 on the outer race of wheel bearing (Fig. 16). Press the wheel bearing out of the steering knuckle.





11. Install Bearing Splitter, Special Tool 1130, on the hub. The bearing splitter is to be installed on the hub so it is between the flange of the hub and the outer bearing race on the hub (Fig. 17). Place the hub, bearing race and bearing splitter in an arbor press as shown (Fig. 17). Place Driver, Special Tool 6644-2 on end of hub. Press the hub out of the outer bearing race.

ASSEMBLY - WHEEL BEARING AND HUB

NOTE: The removal and installation of the wheel bearing and hub from the steering knuckle is only to be done with the steering knuckle removed from the vehicle.

1. Wipe the empty bore of the steering knuckle clean of any grease or dirt with a clean, dry shop towel.





2. Place the new wheel bearing into the bore of the steering knuckle. Be sure the wheel bearing is placed squarely into the bore. Place the steering knuckle in an arbor press with Receiver, Special Tool C-4698-2, supporting the steering knuckle (Fig. 18). Place Driver, Special Tool 5052, on the outer race of the wheel bearing. Press the wheel bearing into the steering knuckle until it is fully bottomed in the bore of the steering knuckle. Remove the knuckle from the press.

NOTE: Only the original or identical replacement bolts are to be used to mount the bearing retainer plate to the steering knuckle.





3. Install the bearing retainer plate on the steering knuckle (Fig. 19). Install the three bearing retainer mounting bolts. Tighten the bearing retainer plate mounting bolts to a torque of 28 Nm (250 inch lbs.).





4. Place the previously removed wheel mounting stud back into the hub flange. Place the hub in the arbor press supported by Special Tool C-4698-1 (Fig. 20). Press wheel mounting stud into hub flange until it is fully seated against the back side on the hub flange. Remove the hub from the press.





5. Place the steering knuckle with the wheel bearing installed back in the arbor press with Receiver, Special Tool MB-990799 supporting the inner race of the wheel bearing as shown (Fig. 21). Place the hub in wheel bearing making sure it is square with the bearing inner race. Press the hub into the wheel bearing until it is fully bottomed in the wheel bearing. Remove the knuckle from the press.
6. Install the steering knuckle assembly on the vehicle.

INSTALLATION
1. If the steering knuckle is being replaced and the wheel bearing and hub must be installed, Refer to KNUCKLE - ASSEMBLY. Do not reuse the old wheel bearing.
2. Slide the hub of the steering knuckle onto the splines on the driveshaft C/V joint.
3. Install the steering knuckle onto the ball joint stud aligning the bolt hole in the knuckle boss with the notch formed in the side of the ball joint stud.
4. Install a new ball joint stud pinch bolt and nut (Fig. 6). Tighten the nut to a torque of 95 Nm (70 ft. lbs.).

CAUTION: The strut assembly-to-steering knuckle attaching bolts are serrated and must not be turned during installation. Install the nuts while holding the bolts stationary in the steering knuckle.

5. Position the lower end of the strut assembly in line with the upper end of the steering knuckle and align the mounting holes. Install the two attaching bolts. The bolts should be installed with so that the nuts face towards the front of the vehicle once installed. Install the nuts. Holding the bolts in place tighten the nuts to a torque of 53 Nm (40 ft. lbs.) plus an additional 90° turn after the specified torque is met.
6. Place the tie rod heat shield on the steering knuckle arm so that the shield is positioned straight away from the steering gear and tie rod end once installed. Align the hole in the shield with the hole in the steering knuckle arm.
7. Install the outer tie rod ball stud into the hole in the steering knuckle arm. Start the tie rod attaching nut onto the stud. Hold the tie rod end stud with a wrench while tightening the nut with a standard wrench or crowfoot wrench (Fig. 4). To fully tighten the nut to specifications, use a crowfoot wrench on a torque wrench to turn the nut, and a wrench on the stud. Tighten the nut to a torque of 55 Nm (40 ft. lbs.).
8. Install the brake rotor on the hub (Fig. 3).





9. Install the disc brake caliper (with pads) on the brake rotor and steering knuckle. The left side caliper is installed by first sliding the top of the caliper past the top abutment on the steering knuckle to hook the top edge of the caliper, then pushing the lower end of the caliper into place against the knuckle (Fig. 22). The right side caliper is installed by first sliding the bottom edge of the caliper past the lower abutment on the steering knuckle to hook the lower edge of the caliper, then pushing the top of the caliper into place against the steering knuckle.
10. Install the two guide pin bolts securing the front disc brake caliper to the steering knuckle (Fig. 3). Tighten the guide pin bolts to a torque of 22 Nm (192 inch lbs.).
11. Clean all foreign matter from the threads of the driveshaft outer C/V joint (Fig. 2).
12. Install the hub nut in the end of the driveshaft and snug it.
13. Have a helper apply the brakes. With vehicle brakes applied to keep brake rotor and hub from turning, tighten the hub nut to a torque of 244 Nm (180 ft. lbs.).





14. Install the spring washer, lock nut and cotter pin on the hub nut (Fig. 2). Wrap the cotter pin ends tightly around the lock nut (Fig. 23).
15. Install the tire and wheel assembly. Install the wheel mounting nuts and tighten them to a torque of 135 Nm (100 ft. lbs.).
16. Lower the vehicle.
17. Set front toe on the vehicle to specification.