This procedure covers the removal and replacement of the lower ball joint on a 2015 Kia Forte with 1.8L I4 engine.

Warnings

Tools required

Parts

• Lower ball joint assembly × 1 — Use OEM specification
• Cotter pin × 1 — Use OEM specification
• Pinch bolt (if applicable) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Place wheel chocks behind rear wheels
3. Loosen wheel lug nuts 1/4 turn while vehicle is on ground
4. Raise front of vehicle with floor jack at designated jacking point
5. Support vehicle securely on jack stands placed at frame reinforcement points
6. Remove front wheel completely

Procedure

1. 1

   Remove cotter pin and loosen ball joint nut
   Locate the lower ball joint where it connects to the steering knuckle. Use pliers to straighten and remove the cotter pin from the ball joint castle nut. Discard the old cotter pin. Loosen but do not remove the ball joint nut several turns to protect threads during separation.
2. 2

   Disconnect sway bar link if necessary
   If the sway bar link interferes with ball joint access, hold the shaft with an Allen key and remove the lower sway bar link nut. Swing the link out of the way.
   Torque spec

   Sway Bar Link Nuts55 Nm (41 lb-ft)
3. 3

   Separate ball joint from steering knuckle
   Use a ball joint separator or pickle fork to break the taper connection between the ball joint stud and the steering knuckle. Insert the tool between the knuckle and control arm, then strike firmly or apply pressure until the joint separates. Remove the ball joint nut completely once separated.
4. 4

   Support lower control arm
   Place a floor jack or jack stand under the outer portion of the lower control arm near the ball joint to support the arm and prevent it from dropping when the ball joint is removed. Apply just enough pressure to support the weight without loading the suspension.
5. 5

   Remove ball joint mounting fasteners
   Locate the ball joint-to-control-arm mounting bolts on the underside of the lower control arm. Remove these fasteners completely. Note the orientation and position of any washers or alignment tabs. The ball joint may be bolted or riveted; if riveted, drill out rivets with appropriate size bit.
6. 6

   Remove old ball joint
   Extract the ball joint from the control arm. If it's pressed in, a ball joint press tool may be required. Clean the mounting area on the control arm thoroughly with a wire brush, removing any rust, debris, or old gasket material.
7. 7

   Install new ball joint
   Position the new ball joint in the control arm mounting location, ensuring proper orientation. If the ball joint is pressed in, use a ball joint press to seat it fully. If bolted, align the bolt holes and install new mounting bolts finger-tight. Torque ball joint mounting bolts per service specifications if different from control arm bolts.
8. 8

   Reconnect ball joint to steering knuckle
   Align the ball joint stud with the hole in the steering knuckle. If necessary, use a pry bar to position the knuckle. Install the ball joint nut and torque to specification. If applicable, continue tightening to align the next cotter pin hole, never loosen to align. Install new cotter pin and bend ends to secure.
   Torque spec

   Ball Joint Nut97 Nm (71 lb-ft)
9. 9

   Reconnect sway bar link
   If the sway bar link was disconnected, reconnect it to the lower control arm or strut. Hold the shaft with an Allen key and torque the nut to specification.
   Torque spec

   Sway Bar Link Nuts55 Nm (41 lb-ft)
10. 10

    Install wheel and lower vehicle partially
    Mount the wheel onto the hub and install lug nuts hand-tight. Lower the vehicle until the tire just contacts the ground with minimal weight on it. This allows the suspension to settle to normal ride height for final torquing.
11. 11

    Final torque procedures
    With vehicle weight on the wheels (tire touching ground), torque the control arm bolts to specification if they were loosened or removed. Fully lower the vehicle to the ground and torque wheel lug nuts to specification in a star pattern.
    Torque spec

    Control Arm Bolts165 Nm (122 lb-ft)

    Wheel Lug Nuts129 Nm (95 lb-ft)

Reassembly

1. Always use a new cotter pin on the ball joint castle nut
2. Ensure all suspension fasteners are torqued with vehicle at ride height to prevent bushing bind
3. Double-check that ball joint taper is fully seated in the steering knuckle before torquing

Verification

• With vehicle on ground, bounce the front suspension and listen for any clunking or looseness
• Verify the wheel can be turned lock-to-lock smoothly without binding
• Check that the new cotter pin is properly installed and bent
• Road test vehicle at low speed and verify no unusual noises or steering behavior
• Schedule front end alignment as replacing ball joint will affect alignment settings

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