Replacement of the front lower control arm on a 2016-2021 Honda Civic 1.5L Turbo, including ball joint separation and proper torque procedures at ride height.

Warnings

Tools required

Parts

• Lower control arm assembly × 1 — 51360-TBA-A01 or aftermarket equivalent
• Cotter pin for ball joint castle nut × 1 — Use OEM specification
• Control arm mounting bolts (if corroded) × 2 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Loosen front wheel lug nuts while vehicle is on ground (do not remove)
3. Raise front of vehicle and support securely on jack stands at frame rails
4. Remove front wheel on the side being serviced
5. Spray penetrating lubricant on ball joint castle nut, control arm mounting bolts, and allow to soak 10-15 minutes

Procedure

1. 1

   Remove ball joint cotter pin
   Locate the ball joint castle nut where the lower control arm connects to the steering knuckle. Straighten and remove the cotter pin using needle-nose pliers. Discard the old cotter pin as it must not be reused.
2. 2

   Loosen ball joint castle nut
   Using a 17mm socket, loosen but do not fully remove the castle nut from the ball joint stud. Leave the nut threaded on a few turns to protect the threads during separation.
3. 3

   Separate ball joint from knuckle
   Using a ball joint separator tool or pickle fork, carefully separate the ball joint taper from the steering knuckle. Once the taper breaks free, remove the castle nut completely. Support the control arm to prevent it from dropping suddenly.
   ⚠Keep hands and body clear of the control arm as spring tension may cause it to drop when separated.
4. 4

   Remove rear control arm mounting bolt
   Locate the rear control arm mounting bolt (toward the rear of the vehicle) that connects the control arm to the subframe. Use a 14mm socket and breaker bar to remove this bolt completely. Note the orientation and any washers for reinstallation.
5. 5

   Remove front control arm mounting bolt
   Remove the front control arm mounting bolt (toward the front of the vehicle) that connects the control arm to the subframe. This bolt may require more force due to bushing preload. Remove the bolt completely and extract the control arm from the vehicle.
6. 6

   Clean mounting surfaces
   Use a wire brush to clean the subframe mounting points and steering knuckle ball joint taper seat. Remove any rust, debris, or old thread locking compound. Inspect the ball joint taper seat in the knuckle for damage or excessive wear.
7. 7

   Install new control arm to subframe
   Position the new control arm to the subframe mounting points. Insert both the front and rear mounting bolts through the control arm bushings and into the subframe. Thread the bolts by hand but DO NOT TIGHTEN yet. The bolts must be torqued at ride height in a later step.
8. 8

   Connect ball joint to knuckle
   Align the ball joint stud with the hole in the steering knuckle. You may need to use a pry bar or jack to manipulate the control arm position. Insert the ball joint stud fully into the knuckle taper. Thread the new castle nut onto the ball joint stud by hand.
9. 9

   Torque ball joint castle nut
   Torque the ball joint castle nut to specification. If the castle nut slots do not align with the cotter pin hole at the specified torque, continue tightening (do not loosen) until the next slot aligns with the hole. Install a new cotter pin and bend the ends to secure.
   Torque spec

   Ball Joint Castle Nut54 Nm (40 lb-ft)
10. 10

    Load suspension to ride height
    Place a floor jack under the lower control arm or suspension component near the wheel hub. Carefully raise the jack until the suspension is compressed to approximate ride height (suspension loaded, not fully extended). This simulates the vehicle's weight on the suspension.
    ⚠Do not raise the vehicle off the jack stands. Only compress the suspension enough to load the bushings.
11. 11

    Torque control arm mounting bolts at ride height
    With the suspension loaded to ride height, torque both the front and rear control arm mounting bolts to the specified value. This is critical to prevent premature bushing failure. Torque the larger diameter bushing bolt to 61 lb-ft if applicable, or follow the 47 lb-ft specification for standard bolts.
    ⚠Control arm bolts must be torqued with suspension at ride height. Torquing at full droop will cause bushing failure.
    Torque spec

    Control Arm Bolts64 Nm (47 lb-ft)
12. 12

    Remove jack and reinstall wheel
    Lower and remove the floor jack from under the suspension. Reinstall the wheel and hand-tighten all lug nuts in a star pattern. Lower the vehicle to the ground.
13. 13

    Torque wheel lug nuts
    With the vehicle on the ground, torque the wheel lug nuts to specification in a star pattern to ensure even seating of the wheel.
    Torque spec

    Wheel Lug Nuts129 Nm (95 lb-ft)

Reassembly

1. Ensure all fasteners are torqued to specification, particularly control arm bolts at ride height
2. Verify cotter pin is properly installed and bent to secure the castle nut
3. Check that no tools or parts were left in the wheel well or suspension area

Verification

• Test drive the vehicle at low speed and listen for any clunking or unusual noises from the front suspension
• Verify steering feel is normal with no binding or unusual resistance
• Schedule a professional wheel alignment as control arm replacement affects camber and toe settings
• After 50-100 miles, re-check torque on control arm mounting bolts and ball joint castle nut

More procedures for this vehicle