Removing the knuckle from the car (1:00)
- Remove the wheel cap and remove the wheel.
- Remove the brake caliper.
- Carefully hang the caliper out of the working area.
- If it is hard to remove, screw a bolt into the exposed threaded hole on the disc to remove it.
- Remove the speed sensor.
- If rust exists, use a penetrating fluid to ease removal.
Tip: It is better not to use an impact wrench to avoid damage to the driven shaft
- Now the drive shaft lock nut needs to be removed.
- Unstake the staked part of the lock nut by using a screwdriver or similar tool.
- Loosen the drive shaft nut and remove
- Loosely fit the nut until it is flush with the end of the drive shaft
Tip: This helps to prevent damage to the drive shaft threads and is also a reason to discard the nut
- To remove stearing-arm ball joint, first take out the split pin.
- Loosen the ball joint nut.
- The ball joint at the stearing-arm end is often secured to the knuckle very tightly.
Tip: In case the nut is rotating with the ball joint, press the ball joint further into the knuckle arm. The nut can now be loosened
- The ball joint at the stearing-arm end is often secured to the knuckle very tightly
- Use a dedicated tool and hammer it from above with care not to damage the bolt threads
Tip: If you don’t have a dedicated tool as shown, or a ball joint splitter, do not hammer the ball joint directly. It is possible to hammer the end of the knuckle mounting arm lightly to loosen and remove the ball joint.
- Remove clip and nut for dismounting front suspension arm.
- Remove ball joint of front suspension arm by using a dedicated ball joint splitter.
- Loosen and remove the bolts which fasten the knuckle to the suspension. The knuckle can now be removed.
Removing the wheel bearing from the knuckle (3:12)
- Insert a crowbar or something similar into the gap to avoid deforming the dust cover when removing the front axle hub.
- Remove the snap ring from the knuckle.
- Keep the knuckle horizontal on a support, put a suitable tool on the end face of the hub and remove the hub.
- The inner ring must now be removed from the hub. Insert a separator into the gap between the end face of the inner ring and the hub.
Tip: For safe removal ensure that there is enough contact between the end face of the inner ring and the separator.
- Pull off the inner ring.
- Alternatively it is possible to use a hydraulic press.
Tip: Keep the inner ring to press out the bearing in the next step.
- Ensure the knuckle is supported safely and the bearing is in a vertical orientation.
- Reinsert the removed inner ring.
- Ensure the dedicated tool outside diameter matches the bearing inner ring.
- Press the bearing out of the knuckle.
- Always inspect the knuckle bore and the hub shaft for damage.
- Clean the removed parts with a parts cleaner.
Tip: By cleaning the parts before assembly the mounting is less problematic and premature failure can be avoided.
Installing the new wheel bearing into the knuckle (4:40)
- Due to the magnetic encoder on one side of the bearing, you need to pay attention for directing of inserting the bearing.
- NSK recommends to use such a card to identify which side of the bearing has the encoder seal.
Tip: Avoid any damage to the encoder surface
- Inside the seal there are many N+S poles which are read by the speed sensor.
Tip: Only remove the bearing from its protective packaging immediately before the fitting
- The bearing should be inserted to the knuckle so that the encoder surface is adjacent to the sensor after assembly.
Tip: Do not put pressure on the encoder surface and keep it away from magnets or dirt.
- Use a suitable tool that comes in contact with only the end face of the outer ring.
Tip: Outer diameter of tool < outer diameter of bearing.
- It is important to keep the bearing aligned to the knuckle bore and press it vertically into the knuckle.
Tip: Never press the inner ring to insert the bearing.
- Make sure that the bearing is not inclined, and press it until correctly seated.
- Insert a new snap ring.
Tip: The gap in the snap ring should align with the sensor mounting hole on the knuckle.
- Avoid any damage to the encoder surface.
- Keep the front axle hub horizontal.
- Support the hub, so that the shaft is vertical.
- By using a suitable tool, push on the end face of the inner ring.
- Press the bearing until seated against the indicated position.
Mounting the knuckle (6:45)
- Insert the knuckle assembly onto the drive shaft and suspension.
- Tighten the knuckle mounting bolts to the torque value specified by the vehicle manufacturer.
Tip: Torque settings can vary significantly between car models. Therefore check the manufacturer values.
- Attach the ball joint at the tie-rod end.
- Tighten the nut to the specified torque value.
Tip: In case the nut is rotating with the ball joint, press the ball joint further into the knuckle arm. The nut can now be tightened.
- Insert the split pin. Be sure to use a new one.
- Mount the front suspension arm.
- The nut must be tightened to the specified torque value. Use a new clip.
- After fitting the new nut by hand, tighten further with a socket to ensure the drive shaft is seated.
- The final torque setting will be done later when the car is on the ground.
- Attach the speed sensor.
- Mount the brake disc and the brake caliper.
Tip: Ensure the brake hose has not be twisted or damaged.
- Mount the tyre and lower the car.
- Now the car is on the ground, the drive shaft nut can be tightened to the value specified by the manufacturer.
- Stake the nut into the groove of the shaft.
- The replacing of the hub bearing with magnetic encoder is completed.
- Depending whether the wheel is alloy or steel, there are various torque values and procedures. Please check carefully with the manufacturer`s instructions.
- Before driving, press several times on the brake pedal to ensure the brake pads come in contact with the brake discs.
- As the suspension has been disassembled, it is advisable to have the steering geometry checked.