CV Axle - Front

Remove and replace the front CV axle assembly on a 2019 Mini Cooper with 1.5L I3 Turbo engine, including hub nut removal, lower control arm separation, and inner CV joint disconnection from transmission.

Warnings

Tools required

Parts

• CV axle assembly (left or right, verify side) × 1 — Use OEM specification or GKN aftermarket equivalent
• Axle hub nut (self-locking) × 1 — BMW 31206850156 or equivalent
• Transmission sealant/RTV (if applicable) × 1 — Use OEM specification

Fluids

• Aisin Type T-IV ATF or BMW 83222365987 — 0.5 qt

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Loosen front wheel lug nuts 1/4 turn while vehicle is on ground.
3. Using a 32mm socket and breaker bar, loosen the axle hub nut 1/4 turn while vehicle is on ground and brake pedal is depressed (or transmission in Park). Do not remove completely.
4. Raise front of vehicle with floor jack and support securely on jack stands at manufacturer specified lift points.
5. Remove wheel completely.
6. Position drain pan beneath transmission to catch fluid spillage during axle removal.

Procedure

1. 1

   Remove axle hub nut
   With vehicle raised and wheel removed, fully remove the 32mm axle hub nut that was previously loosened. Set aside and discard (new nut will be used during installation). This platform uses a self-locking collar nut rather than a staked nut; simply remove the nut fully with the 32mm socket. Note: This platform typically uses a self-locking (non-staked) axle nut; simply remove it with the 32mm socket. VERIFY whether a staked nut is used on your specific variant before removal.
2. 2

   Disconnect lower ball joint from knuckle
   Locate the lower ball joint pinch bolt connecting the lower control arm to the steering knuckle. Remove the single pinch bolt (verify exact size/type against Mini F56 documentation). With the pinch bolt removed, spread the knuckle clamp slightly and pry the lower control arm ball joint stud downward out of the clamp slot. Pry the control arm downward to create clearance. Pry the control arm downward to create clearance.
   ⚠Using a pickle fork will likely damage the ball joint boot. Use a proper ball joint separator tool if reusing control arm components.
3. 3

   Support outer CV joint and remove axle from hub
   With the lower control arm separated, pull the steering knuckle outward while simultaneously pushing the axle shaft inward through the hub bore. The axle splines should disengage from the wheel hub. Support the outer CV joint to prevent it from hanging freely. If the axle is stuck in the hub splines, use a brass drift and hammer on the inner end of the axle to push it through, or use a hub puller if available.
4. 4

   Disconnect inner CV joint from transmission
   Locate the inner CV joint connection at the transmission differential. On this platform, the inner joint is a splined stub shaft that inserts into the transmission differential and is retained by an internal circlip. Pry the inner joint out of the differential using a pry bar positioned between the inner joint housing and the transmission case, applying a sharp outward pull to pop the circlip free. Do not pry against or damage the axle seal. Support the weight of the axle during removal. Once bolts are removed, separate the CV joint flange from the transmission flange and carefully withdraw the entire axle assembly from the vehicle. Note: On this transverse FWD platform, the inner joint typically engages the transmission/differential via a splined stub shaft retained by an internal circlip (not a bolted flange). Pry the inner joint out of the differential housing using a pry bar between the joint and the transmission case, applying firm even force to release the circlip. VERIFY the exact retention method (circlip vs. flanged) against factory documentation before proceeding, as design can vary by transmission (manual vs. automatic).
   ⚠Transmission fluid will spill from the output flange opening. Keep drain pan positioned and be prepared for fluid loss.
   Torque spec

   CV Joint Bolts58 Nm (43 lb-ft)
5. 5

   Inspect hub splines and CV joint flanges
   With axle removed, inspect the wheel hub splines for wear, damage, or corrosion. Clean the hub bore with a wire brush and apply a light coat of anti-seize to the splines. Inspect the transmission output flange for damage, debris, or worn bolt holes. Clean the mating surface of the flange thoroughly. Check the condition of the ball joint taper bore in the steering knuckle.
6. 6

   Install new CV axle inner joint to transmission
   Position the new CV axle assembly with the inner joint splines aligned to the transmission differential. Fit a new circlip to the inner joint stub if not pre-installed. Push the inner joint firmly into the differential until the circlip snaps into its groove; confirm engagement by attempting to pull the joint back out by hand. Support the axle weight to prevent strain on the inner joint during installation. Note: Position the new CV axle assembly with the inner joint splined stub aligned to the transmission/differential bore. Ensure the circlip is seated in its groove and the mating surfaces are clean. Push the inner joint firmly straight into the differential until the circlip clicks and locks into place; confirm engagement by attempting to pull the joint back out by hand. Support the axle weight to prevent strain on the inner joint during installation. VERIFY retention method against factory documentation.
   Torque spec

   CV Joint Bolts58 Nm (43 lb-ft)
7. 7

   Install outer CV joint into wheel hub
   Guide the outer CV joint splines into the wheel hub bore. Align the splines carefully and push the axle shaft through the hub until it is fully seated. The axle should protrude through the hub enough to accept the hub nut threads. If resistance is encountered, verify spline alignment and rotate the axle slightly while applying inward pressure.
8. 8

   Reconnect lower ball joint to knuckle
   Lift the lower control arm and insert the ball joint taper into the steering knuckle bore. Ensure the taper is fully seated. Install the pinch bolt and torque to specification. Verify the ball joint is properly captured in the knuckle before proceeding.
   Torque spec

   Ball Joint Pinch Bolt55 Nm (41 lb-ft)
9. 9

   Install and torque new axle hub nut
   Install the new self-locking 32mm axle hub nut onto the axle shaft threads. Thread the nut by hand initially to verify proper thread engagement. With the vehicle still on jack stands and the brake rotor prevented from rotating (use a pry bar against the rotor or have an assistant apply the brake pedal), torque the axle nut to the Mini F56 factory specification (verify in BMW/Mini documentation; typically approximately 280 Nm / 207 lb-ft for this platform) using a calibrated torque wrench. The self-locking axle nut requires no staking; a new self-locking nut must be used for each installation to ensure proper retention. Verify the nut is fully seated and torqued to specification. Note: torque the axle nut to the factory-specified value using a calibrated torque wrench (VERIFY exact spec against Mini F56 factory documentation — commonly in the range of ~260-290 Nm plus a possible additional torque-angle; do NOT assume 232 Nm) Note: This nut is a one-time-use self-locking nut and does not require staking; discard the old nut and always use a new self-locking nut on reassembly. VERIFY whether the specific F56 variant uses a self-locking collar nut or a staked nut against factory documentation before finalizing.
   ℹ️The axle nut must be staked after torquing to prevent rotation. Use a new self-locking nut; do not reuse the old nut.
   Torque spec

   Axle Nut232 Nm (171 lb-ft)
10. 10

    Reinstall wheel and lower vehicle
    Reinstall the wheel onto the hub and hand-tighten all lug nuts in a star pattern. Lower the vehicle until the tire just contacts the ground (weight not fully on tire). Torque the lug nuts to specification in a star pattern. Fully lower the vehicle and remove jack stands.
    Torque spec

    Wheel Lug Nuts115.2 Nm (85 lb-ft)
11. 11

    Check and refill transmission fluid
    Check the transmission fluid level according to manufacturer procedure (typically requires vehicle running at operating temperature on level ground). Add the correct transmission fluid for the specific transmission fitted (verify whether manual or automatic; use the exact BMW/Mini-specified ATF or manual transmission fluid part number from factory documentation) as needed to compensate for fluid lost during axle removal. Expect approximately 0.25-0.5 quarts to be needed depending on spillage during removal. Note: Add the manufacturer-specified transmission fluid as needed to compensate for fluid lost during axle removal. VERIFY the exact fluid type and part number against factory documentation for your specific transmission (automatic ATF spec vs. manual gear oil differ).

Reassembly

1. Torque all fasteners to specifications in the order listed, using new self-locking hardware where specified.
2. Ensure the axle hub nut is properly staked after torquing to prevent loosening.
3. Verify transmission fluid level after completion and top off as necessary.
4. Road test the vehicle to verify proper CV axle operation, listening for clicking or binding during turns.

Verification

• With vehicle on level ground, verify no transmission fluid leaks from the inner CV joint flange connection.
• Rotate the steering wheel lock-to-lock while stationary to verify full range of motion without binding or clicking from CV joints.
• Test drive the vehicle and perform slow-speed tight turns in both directions, listening for CV joint clicking or popping noises that would indicate improper installation or defective parts.
• Verify the axle hub nut stake is properly formed and the nut shows no signs of rotation.
• Check for any abnormal vibrations at highway speeds that could indicate improper axle installation or imbalanced components.