How to replace the front wheel bearings?

Tiny
CANDO1
  • MEMBER
  • 2012 KIA OPTIMA
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
Passenger front wheel bearing is bad.
Can you send instructions with pictures on replacing both front wheel bearings and should I replace the Hubs too?
Thanks
Sunday, October 16th, 2022 AT 6:23 PM

1 Reply

Tiny
BORIS K
  • MECHANIC
  • 799 POSTS
Hello,

To replace the front wheel bearings and hub you require some special tools.
Shop press.
Torque wrench.

A good video:
https://youtu.be/JOOgAfVsj_4

How to replace axle hubs:
https://www.2carpros.com/articles/bearing-hub-replacement

Due to wear and tear issues, it is recommended to always replace the hub, not just the bearing

Repair Procedures

Replacement

1.Loosen the wheel nuts slightly.
Raise the vehicle, and make sure it is securely supported.
2.Remove wheel nuts, front wheel and tire from front hub.

Tightening torque:
88.2 - 107.8 Nm (65.0 - 79.5 lb-ft)

Caution:
Be careful not to damage the wheel nuts when removing the front wheel and tire.

3.Remove the brake caliper mounting bolts, and then hold the brake caliper assembly (A) with wire.

Tightening torque:
78.4 - 98.0 Nm (57.8 - 72.3 lb-ft)

4.Remove driveshaft nut (A) from the front hub when applying the brake.

Tightening torque:
215.7 - 254.9 Nm (159.1 - 188.0 lb-ft)

CAUTION:
After installation lock nut, stake the lock nut using a chisel and hammer as shown in the illustration below.

5.Remove the tie rod end ball joint (A) from the knuckle.
(1)Remove the split pin (C).
(2)Remove the castle nut (B).

Tightening torque:
34.3 - 44.0 Nm (25.3 - 32.5 lb-ft)

6.Loosen the mount bolt and then remove the wheel speed sensor (A) from knuckle.

Tightening torque:
6.8 - 10.7 Nm (5.0 - 7.9 lb-ft)

7.Loosen the bolt & nut and then remove the knuckle from the strut assembly (A).

Tightening torque:
156.9 - 176.5Nm (115.7 - 130.2lb-ft)

8.Disconnect the driveshaft (A) from the front hub assembly.

9.Loosen the bolt & nut and then remove the lower arm (A).

Tightening torque:
98.0 - 117.6 Nm (72.3 - 86.7 lb-ft)

10.Install in the reverse order of removal.

Inspection

1.Check the hub for cracks and the splines for wear.
2.Check the brake disc for scoring and damage.
3.Check the knuckle for cracks
4.Check the bearing for cracks or damage.

Disassembly

1.Remove the snap ring (A).

2.Remove the hub assembly from the knuckle assembly.
(1)Install the front knuckle assembly (A) on press.
(2)Lay a suitable adapter (B) upon the hub assembly shaft.

3.Remove the hub bearing inner race from the hub assembly.
(1)Install a suitable tool (A) for removing the hub bearing inner race on the hub assembly.
(2)Lay the hub assembly and tool (A) upon a suitable adapter (B).
(3)Lay a suitable adapter (C) upon the hub assembly shaft.
(4)Remove the hub bearing inner race (D) from the hub assembly by using press.

4.Remove the hub bearing outer race from the knuckle assembly.
(1)Lay the hub assembly (A) upon a suitable adapter (B).
(2)Lay a suitable adapter (C) upon the hub bearing outer race.
(3)Remove the hub bearing outer race from the knuckle assembly by using press.

5.Replace hub bearing with a new one.

reassembly

1.Install the hub bearing to the knuckle assembly.
(1)Lay the knuckle assembly (A) on press.
(2)Lay a new hub bearing upon the knuckle assembly (A).
(3)Lay a suitable adapter (B) upon the hub bearing.
(4)Install the hub bearing to the knuckle assembly by using press.

CAUTION:
-Do not press against the inner race of the hub bearing because that can cause damage to the bearing assembly.
-Always use a new wheel bearing assembly.

2.Install the hub assembly to the knuckle assembly.
(1)Lay the hub assembly (A) upon a suitable adapter.
(2)Lay the knuckle assembly (B) upon the hub assembly (A).
(3)Lay a suitable adapter (C) upon the hub bearing.
(4)Install the hub assembly (A) to the knuckle assembly (B) by using press.

CAUTION:
Do not press against the inner race of the hub bearing because that can cause damage to the bearing assembly.

3.Install the snap ring (A).

Hope this helps.

Cheers, Boris

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Monday, October 17th, 2022 AT 9:06 AM

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