425219 Removing and installing rear wheel bearing housing
WM 425219 Removing and installing rear wheel bearing housing
Tools
Technical values
Preliminary work
WARNING
Wheel bearing housing raised incorrectly
- Risk of squashing
- Risk of damage to components
-> Wear personal protective gear.
-> Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels).
1. Loosen axle nut (drive shaft mounting on wheel side). Operate the brake while doing this (2 mechanics required).
2. Raise the vehicle=> Lifting the vehicle and remove wheel -> 440519 Removing and installing wheel - section on "Removing" Removal and Replacement.
Tools and materials
Puller set Nr.87-1 Pos.1
Spring clamp 9823
Protective tube - For protecting the drive shaft (shop-made).
Removing wheel bearing housing
Removing wheel bearing housing (wheel carrier)
1. Remove the brake caliper from the wheel bearing housing and suspend it at a suitable place in the wheel arch (do not open brake hydraulics). -> 474119 Removing and installing rear brake caliper 474119 Removing and installing rear brake calliper -> 474119 Removing and installing rear brake caliper (PCCB) 474119 Removing and installing rear brake calliper (PCCB)
2. Remove rear brake disc. -> 465319 Removing and installing rear brake disc 465319 Removing and installing rear brake disc-> 465419 Removing and installing rear brake disc (PCCB) 465419 Removing and installing rear brake disc (PCCB)
3. Disconnect push-on connector -1- and unclip it from the bracket -2- on the wheel carrier -arrow-.
Pulling off connector
Information
- Before raising the vehicle, loosen the drive shaft mounting at the wheel side. Operate the brake while doing this (2 mechanics required).
- To prevent damage to the drive shaft, suspension subframe or transmission flange, slide a protective tube (shop-made) 00000 over the drive shaft.
- Move the electric parking brake into ]] installation position [[ (2nd generation PIWIS Tester).
4. Use puller set Nr.87-1 Pos.1 to push (press) the drive shaft peg into the wheel hub by a maximum of => Control value: +10 mm. Leave the puller fitted (this makes removal easier).
Pressing in drive shaft, front-axle wheel carrier shown
5. Open the plug connections on the wheel bearing housing and pull off the connectors.
6. Unhook cam follower -1- for level sensor at ball pin -2-.
Unhooking level sensor
7. Remove the two outer top control arms (toe, camber).
8. Get a second person to help when removing the front control arm at the wheel bearing housing (wheel carrier may tip outwards).
9. Left side: Brake off plastic protective ring -1- using a screwdriver.
Breaking off plastic protective ring
10. Prise the drive shaft, using 2 mounting levers for example, out of the rear-axle transmission housing.
Positioning mounting levers
11. Loosen the lower control arm -2- at the mounting -1- and take out the wheel bearing housing with the drive shaft (get a second mechanic to help with this!).
Lower control arm mount
12. Remove the axle nut and take out the drive shaft.
Installing
Installing wheel bearing housing (wheel carrier)
Information
- The entire threaded parts of the axle must be tightened in vehicle position. Vehicle position means: vehicle standing on the wheels, or the wheel suspension is raised with a universal vehicle lift. Dimension -X- , from lower edge of wing to centre of axle corresponds to vehicle position. The current height can be found in -> 4495TW Adjustment values for suspension alignment 4495TW Adjustment values for suspension alignment. Always observe the following points.
Dimension X - centre of wheel to lower edge of wing (rear axle shown)
Steel suspension
- The vehicle position is reached at the rear axle by pre-tensioning the steel spring using the spring clamp 9823 until the axle can be carefully lifted into the vehicle position.
Air suspension
- Vehicle position can be obtained on the front axle of vehicles with air suspension by using the Porsche System Tester to bleed the relevant air spring and carefully raise the relevant wheel bearing housing. -> 4301IN Bleeding and filling the levelling system 4301IN Bleeding and filling the levelling system
- Use an intermediate layer (hard rubber)! Do not damage the brake cover plate.
Raising wheel carrier (air suspension), front axle shown with brake disc and caliper fitted
- Screws and nuts are Geomet-coated and must not be greased.
- Grease the toothing of the drive shaft slightly with aluminium paste Optimoly TA.
- Drive shafts must not be left hanging from the joint stop! Tie up.
- Insert drive shafts with new protective ring and circlip.
- Use new screws and lock nuts.
- Use correct tightening torques and torque angle. -> 4X00IN Tightening torques for rear axle 4X00IN Tightening torques for rear axle
Installation is performed in reverse order to removal.
Information
Before installing the shaft, replace the lock ring (circlip) on the shaft as well as the shaft sealing ring in the final drive -> 392219 Removing and installing sealing ring for output flange 392255 Replacing sealing ring for output flange.
Make sure not to damage the sealing ring when guiding the shaft into the final drive.
- The inner end of the drive shaft must be held with both hands at the joint and inserted into the rear axle differential with a quick jerk. The outer joint must be held by a second mechanic in order to prevent damage.
- Check that the joint is seated correctly in the rear axle differential: Hold the joint with both hands and pull outwards.
- Visually check that the plastic protective rings are flush on the rear axle differential.
- Left side: Replace the plastic protective ring that was damaged irreparably during removal.
1. Grease toothing with a little Optimoly TA aluminium paste and insert drive shaft. When doing this, press inner joint together tightly.
2. Screw on the axle nut to prevent the shaft from slipping out.
3. Tighten the drive shaft.
3.1. In Step 1, "before installation", fit the drive shaft into the wheel hub with => Tightening torque: +130 Nm (+96 ftlb.). To do this, place the wheel carrier with the drive shaft and tool on the floor (do not damage the brake cover plate) and tighten the drive shaft -direction arrow-. A second mechanic is required!
3.2. The second tightening step is performed with the wheel bearing housing installed! Use the specified tightening torque. -> 4X00IN Tightening torques for rear axle 4X00IN Tightening torques for rear axle
Tightening drive shaft
4. Use a new sealing ring in the rear axle differential and a new protective ring and circlip on the drive shaft.
5. Fit the wheel bearing housing (second mechanic required). First, fit the drive shaft on the rear axle differential housing with a quick, strong tap.
WARNING
Wheel bearing housing raised incorrectly
- Risk of squashing
- Risk of damage to components
-> Wear personal protective gear.
-> Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels).
6. Align the ball-joint bearing at the correct position and carefully insert it in the lower wishbone. Loosen the lower damper/connecting link threaded joint if necessary. This opens the forks on the lower wishbone and the wheel bearing housing can be inserted.
7. Fit the control arms and the brake caliper.
8. Plug in the plug connections. Ensure correct routing.
Subsequent work
1. Adjust the brake shoes to their basic setting and calibrate the electric parking brake actuators. -> 468316 Adjusting and calibrating parking-brake shoes Adjustments
2. Fit the wheel. -> 440519 Removing and installing wheel - section on "Installing" Removal and Replacement
3. Tighten axle nut (drive shaft mounting on wheel side) (2-step tightening procedure!). Operate the brake while doing this (2 mechanics required). -> 4X00IN Tightening torques for rear axle 4X00IN Tightening torques for rear axle
4. Fill the air springs. -> 4301IN Bleeding and filling the levelling system 4301IN Bleeding and filling the levelling system
5. Perform suspension alignment => Suspension alignment, complete.