Removing and Installing Rear Wheel Bearing Housing (Wheel Carrier)
Removing and installing rear wheel bearing housing (wheel carrier)
Preliminary work
Information
The drive shaft should only be loosened at the wheel bearing housing if the wheel bearing or wheel bearing housing needs to be replaced.
Loosen axle nut (vehicle on ground and brakes operated by 2nd fitter).
1. If necessary (if the wheel bearing or wheel bearing housing was replaced), loosen the drive shaft at the wheel bearing housing (loosen axle nut).
2. Raise the vehicle.
3. Remove wheel.
Removing wheel bearing housing
1. Disengage parking-brake cable at the parking-brake lever.
Removing/fitting parking-brake cable
Release the parking-brake lever (do not operate again until fitting is complete; self-adjusting).
Open cover of oddments tray in center console.
Remove bottom of oddments tray in center console.
Remove the relevant parking-brake cable sideways out of the turnbuckle.
2. Open safety clip on combination plug connection -1- and detach the connector. Dismantle the combination plug connection -1- at the wheel bearing housing.
Remove line for brake pad wear indicator from support on wheel carrier.
Loosen fastening screw -2- and remove the speed sensor.
Combination plug connection/speed sensor
3. Loosen the drive shaft at the transmission and wheel bearing housing (only at the wheel bearing housing if the wheel bearing or wheel bearing housing needs to be replaced).
3.1. Loosen the drive shaft at the transmission.
Drive shaft
3.2. Slide a protective hose -arrow- over the drive shaft to prevent damage to the drive shaft.
Protection for drive shaft
3.3. Loosen the drive shaft at the wheel bearing housing (only if the wheel bearing or wheel bearing housing needs to be replaced).
Use universal drive shaft/wheel hub extractor as of model '86 NR.87-1 to carefully press out the pin of the drive shaft until the shaft can be moved by hand.
Pressing out drive shaft
4. Release brake caliper from wheel bearing housing (do not open brake system) and suspend it in the wheel arch.
5. Pull protective sleeve of the parking-brake cable -2- off the guide tube -1- on the underbody.
Pulling off protective sleeve
Overview of parking-brake shoes
6. The following action, "Detach brake disc and remove parking brake shoes" is only necessary if the wheel bearing or wheel bearing housing is replaced!
6.1. Remove brake disc and parking-brake shoes -1-.
6.2. Disengage parking-brake cable at the actuating lever -6- and pull it out of the guide on the wheel bearing housing.
7. Unscrew linkage for headlight levelling system (headlight height adjustment) on the trailing arm (left side only). Counter with an open-ended wrench when doing this.
8. Remove connecting link (suspension/stabilizer), spring strut, two upper control arms, toe and lower transverse control arm on wheel bearing housing.
8.1. Loosen the two upper trailing arms on the wheel bearing housing.
Upper trailing arm/wheel bearing housing
8.2. Remove toe and lower transverse control arm (on wheel bearing housing). On the 911 Turbo and 911 GT3, remove the spoiler (air guide for brake cooling system) at the diagonal control arm.
Use the press-out tool P 9560 for pressing out the ball joint. When loosening the lock nuts, counter at the ball-joint pin with a screwdriver P 9546 (Torx screwdriver).
To prevent damage to the rubber boots of the ball joint, coat the rubber boots and the press-out tool in this area with tire mounting paste.
8.3. Loosen connecting link for lower anti-roll bar -1- and spring strut -2- (on wheel bearing housing).
Removing/fitting connecting link
9. Remove wheel bearing housing together with drive shaft.
To pull the ball-joint pin out of the wheel bearing housing, pull the transverse control arm down evenly with both hands while swivelling the wheel bearing housing outwards. Get another person to help you with this.
Installing wheel bearing housing
Use new screws and lock nuts.
Use Optimoly HT to lightly grease the drive shaft toothing (in the wheel bearing housing) and the axle nut thread.
Observe correct tightening torques. Please note: Do not grease threaded connections in Dacromet finish - aluminium color!
1. Insert wheel bearing housing together with drive shaft.
To insert the ball-joint pin into the wheel bearing housing, pull the transverse control arm down evenly with both hands while swivelling the wheel bearing housing inwards. Get a second person to help with this step.
2. Fit connecting link (suspension/stabilizer), spring strut, two upper control arms, toe and lower transverse control arm on the wheel bearing housing.
2.1. Fit toe and lower transverse control arm (on the wheel bearing housing).
Special tool insert for torque wrench 9558 can be used to tighten the connection between the lower control arm and wheel bearing housing.
The advantage of this special tool is that it offers better access compared to a commercially available insert.
A different value must be set on the torque wrench if insert 9558 is used! The nominal value 75 Nm (56 ftlb.) on the lock nut corresponds to a setting on the torque wrench of approx. 55 Nm (41 ftlb.).
- Tightening torque: 75 Nm (56 ftlb.)
or if insert 9558 is used
- Tightening torque: 55 Nm (41 ftlb.)
Counter at the ball joint pin when tightening the lock nuts on the ball joints using a screwdriver P 9546 (Torx screwdriver).
On the 911 Turbo and 911 GT3, fit the spoiler (air guide for brake cooling system) on the diagonal control arm.
2.2. Fit spring strut on the wheel bearing housing -2-.
Removing/fitting connecting link
- Tightening torque: 110 Nm (81 ftlb.)
Fit connecting link for lower anti-roll bar -1- on the wheel bearing housing.
- 3-step tightening procedure (Step 1: tighten to 50 Nm (37 ftlb.). Step 2: loosen by 90 degrees. Step 3: tighten to 65 Nm (48 ftlb.)).: 65 Nm (48 ftlb.)
2.3. Fit both upper trailing arms on the wheel bearing housing.
Upper trailing arm/Wheel bearing housing
- Tightening torque: 110 Nm (81 ftlb.).
3. Fit the drive shaft on the transmission.
Please note the different tightening torques for securing the drive shaft to the transmission (81 Nm (60 ftlb.). or 90 Nm (67 ftlb.))!
Drive shaft
If the M22 axle nut on the wheel bearing housing was removed, replace it with a new axle nut. Do not tighten the axle nut fully until later (when vehicle is lowered).
4. Fit parking-brake shoes and brake disc.
Overview of parking-brake shoes
- Tightening torque: 10 Nm (7.5 ftlb.).
5. Secure brake caliper on wheel bearing housing.
- Tightening torque: 85 Nm (63 ftlb.).
6. Fit linkage for headlight levelling system (headlight height adjustment) on trailing arm (left side only). Counter with an open-ended wrench when doing this. The sensor for the headlight levelling system does not need to be calibrated.
- Tightening torque: 10 Nm (7.5 ftlb.).
7. Install speed sensor -2-.
Combination plug connection/speed sensor
The bore for fitting the speed sensor must be perfectly clean and should be greased with Molykote Longterm 2 plus.
- Tightening torque: 10 Nm (7.5 ftlb.).
Fasten combination wire -1- to wheel bearing housing.
- Tightening torque: 10 Nm (7.5 ftlb.).
Connect electric connectors for combination wire for ABS and brake pad wear indicator and lock using a safety clip. Secure line for brake pad wear indicator on wheel carrier support.
8. Slide protective sleeve of the parking-brake cable -2- onto the guide tube -1- on the underbody. Ensure it is seated correctly!
Sliding on protective sleeve
9. Fit (engage) the parking-brake cable on the parking-brake lever.
Fitting parking-brake cable
10. Check parking-brake shoe setting and adjust if necessary. The parking brake cable is adjusted automatically by operating the parking-brake lever several times in succession (self-adjusting).
Adjusting parking-brake shoes
11. Remove protection for drive shaft -arrow-.
Protection for drive shaft
Subsequent work
1. Fit wheel.
2. Tighten axle nut (drive shaft to wheel bearing housing) if it was removed (vehicle lowered, brakes operated by 2nd fitter).
- Tightening torque: 460 Nm (340 ftlb.)
3. Check wheel alignment values and adjust if necessary.