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Home >> Kia >> 2015 >> Optima EX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 35 (Front Axle Assembly - Optima HEV) >> Front Hub/Knuckle >> Repair Procedures >> Replacement
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Repair Procedures: Replacement

WARNING: This page is about a different variant/trim than selected.
  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 N.m (9.0 ~ 11.0 kgf.m, 65.0 ~ 79.5 lb-ft)

    Fig 1: Wheel Nuts, Front Wheel & Tire
    G08308161Courtesy of KIA MOTORS AMERICA, INC.
    CAUTION: Be careful not to damage to 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 N.m (8.0 ~ 10.0 kgf.m, 57.8 ~ 72.3 lb-ft)

    Fig 2: Front Brake Caliper & Bolts
    G08308162Courtesy of KIA MOTORS AMERICA, INC.
  4. Remove driveshaft nut (A) from the front hub when applying the brake.

    Tightening torque: 

    215.7 ~ 254.9 N.m (22.0 ~ 26.0 kgf.m, 159.1 ~ 188.0 lb-ft)

    Fig 3: Driveshaft Nut
    G08308163Courtesy of KIA MOTORS AMERICA, INC.
  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 N.m (3.5 ~ 4.5 kgf.m, 25.3 ~ 32.5 lb-ft)

      Fig 4: Tie Rod End Ball Joint, Split Pin & Castle Nut
      G08308164Courtesy of KIA MOTORS AMERICA, INC.
  6. Loosen the mount bolt and then remove the wheel speed sensor (A) from knuckle.

    Tightening torque: 

    6.8 ~ 10.7 N.m (0.7 ~ 1.1 kgf.m, 5.0 ~ 7.9 lb-ft)

    Fig 5: Wheel Speed Sensor & Bolt
    G08308165Courtesy of KIA MOTORS AMERICA, INC.
  7. Loosen the bolt & nut and then remove the knuckle from the strut assembly (A).

    Tightening torque: 

    156.9 ~ 176.5 N.m (16.0 ~ 18.0 kgf.m, 115.7 ~ 130.2 lb-ft)

    Fig 6: Strut Assembly & Bolt And Nut
    G08308166Courtesy of KIA MOTORS AMERICA, INC.
  8. Disconnect the driveshaft (A) from the front hub assembly.
    Fig 7: Driveshaft
    G08308167Courtesy of KIA MOTORS AMERICA, INC.
  9. Loosen the bolt & nut and then remove the lower arm (A).

    Tightening torque: 

    98.0 ~ 117.6 N.m (10.0 ~ 12.0 kgf.m, 72.3 ~ 86.7 lb-ft)

    Fig 8: Lower Arm & Bolt And Nut
    G08308168Courtesy of KIA MOTORS AMERICA, INC.
  10. Remove the front lower arm from the front knuckle using the SST (0K545-A9100).
    1. After removing bolts from the front knuckle, install and tighten the sub body bolt (A)
      Fig 9: Install And Tighten Sub Body Bolt (A)
      G00535286Courtesy of KIA MOTORS AMERICA, INC.
    2. Input the sub body (A) between the front knuckle and the sub body bolt.
    3. Tighten bolt (B) of the sub body bolt to broaden the gap of the front knuckle.
      Fig 10: Tighten Bolt (B) Of Sub Body Bolt
      G00535287Courtesy of KIA MOTORS AMERICA, INC.
    4. Install the safe wire (A).
      Fig 11: Install Safe Wire (A)
      G00535288Courtesy of KIA MOTORS AMERICA, INC.
      NOTE: Install a safe wire on the front strut to prevent dropping the SST and hurting technicians.
    5. Install the main body, between the front strut and the lower arm.
      Fig 12: Install Main Body, Between Front Strut And Lower Arm
      G00535289Courtesy of KIA MOTORS AMERICA, INC.
    6. To avoid the main body coming off, install a fixing clamp (A) beside the main body.
      Fig 13: Install A Fixing Clamp (A) Beside The Main Body
      G00535290Courtesy of KIA MOTORS AMERICA, INC.
    7. After installing a fixing clamp, rotate the handle (B) clock wise till the clamp is fixed on a lower arm.
      Fig 14: Installing A Fixing Clamp, Rotate The Handle (B) Clock Wise
      G00529306Courtesy of KIA MOTORS AMERICA, INC.
    8. Tighten a main body bolt (A) of the slowly and remove the lower arm from the front knuckle.
      Fig 15: Tighten a main body bolt (A)
      G00529307Courtesy of KIA MOTORS AMERICA, INC.
  11. Install in the reverse order of removal.