Final Drive, Replacing
Final drive, replacing
Special tools:
951 2940 Counterhold 951 2940 Counterhold
998 5972 JACK 998 5972 Jack
999 5743 Counterhold 999 5743 Counterhold
999 7057 Counterhold 999 7057 Counterhold
Note! Since the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information is always correct.
Removal
Preparations
Note! Check that the parking brake is not applied and that no gear/P-position is engaged.
Removing the rear wheels and the drive shaft screw
Remove:
- the rear wheels
- the screw for the drive shaft and wheel hub on both sides.
Removing the rear section of the exhaust system
Raise the vehicle.
Support the front section of the exhaust system so that there is no strain on the exhaust manifold.
Remove:
- the rear exhaust system assembly
- the mountings for the exhaust system from the rear axle member.
Removing the propeller shaft
Mark the position of the joint on the flange.
Remove the screws from the joint. Use counterhold 999 7057 Counterhold 999 7057 Counterhold.
Leave one screw in place by a few threads for safety.
For cars with a vibration damper on the Active on Demand Coupling flange
Use counterhold 951 2940 Counterhold 951 2940 Counterhold.
Leave one screw in place by a few threads for safety.
On flange with hole pattern for both 4 and 6 bolts, press loose the prop shaft from the AOC-coupling by threading in a bolt M8 20 mm long from the rear through one of the threaded holes that are not used.
Remove the screws from the support for the center bearing for the propeller shaft.
Slacken off the screws in the support for the center bearing on the right-hand side a few turns. Fully remove the screws on the left-hand side.
Let the center support hang down so that the propeller shaft can be angled.
Note! For cars with a vibration damper on the flange of the Active on Demand Coupling, the center bearing member should be removed and the propeller shaft fully tilted to free the rear joint.
Remove the screw from the joint.
Press the shaft joints together. Remove the shaft from the carrier plate. Move the shaft to one side.
Tie up the shaft.
Removing shock absorbers, lateral links and anti-roll bar links (both sides)
Remove:
- the guard for the shock absorber mounting (not shown in the illustration)
- the shock absorber from the control arm
- the screw for the lateral link mounting in the wheel bearing housing
- the anti-roll bar link from the anti-roll bar.
Caution! For certain versions, remove the levers for the level sensor from the control arm(s).
Note! The level sensor may be installed on both the right and left side.
Removing track rods and control arms (both sides)
Press the wheel bearing housing upwards so that the tie rod is horizontal.
Remove the cable for the parking brake from the mounting in the tie rod.
Remove:
- the screw for the tie rod in the wheel bearing housing. Unhook the tie rod from the wheel bearing housing. Lift up the tie rod further so that the screw in the control arm is exposed
- the screws for the control arm. First press the control arm outwards. Move it downwards at the inner mounting. Remove the control arm.
Removing the anti-roll bar
Remove the cables for the parking brake from their brackets in the lower cover and in the heat deflector plate.
Carefully bend out the mechanical cables towards the wheel bearing housing. Ensure that the cables do not crack or break.
Remove:
- the screws for the mountings for the anti-roll bar in the rear axle member
- the anti-roll bar.
Separate the connector for the Active on Demand coupling.
Removing the final drive from the rear axle member
Position mobile jack 998 5972 JACK 998 5972 Jack together with fixture 999 5972 FIXTURE 999 5972 Fixture.
Adjust the plate against the lower cover and final drive.
Install a large hose clamp or several clamps put together over the coupling (AOC (Active on Demand Coupling) / final drive and the plate.
Remove:
- the front screw for the final drive
- the 8 screws for the cover/rear axle member.
Lowering the final drive
First lower the final drive housing slightly. Disconnect the air bleed hose from the nipple on top of the final drive.
Lower the final drive together with the drive shafts so that the center of the drive shaft is slightly below the center of the wheel bearing housings.
Pry out the wheel bearing housing. Remove the drive shaft from the hub.
Caution! Be very careful with the drive shaft when removing it from the hub. The inner joint can be damaged if the shaft releases under its own weight.
Replacing the final drive housing
When replacing the final drive, see Final drive, transferring components, M58, M66 AWD, AW50/51 AWD Final Drive, Transferring Components.
Replacing the drive shaft/drive shaft seal
When replacing the drive shafts and drive shaft seals, see Half shaft seal rear final drive housing, replacing, B5254T2, M58, B5254T2, AW50/51 AWD Half Shaft Seal Rear Final Drive Housing, Replacing.
Installation
Note! For tightening torques, see Tightening torque Tightening Torque.
Note! To make sure that there is no exhaust leakage, see: Flanged joint, assembling Service and Repair.
Preparations for the installation of the final drive
Lift the final drive together with the drive shafts so that the center of the drive shaft is slightly below the center of the wheel bearing housings.
Apply rust-proofing agent to the ends of the drive shafts.
Press out one of the wheel bearing housings. Align the drive shaft in the hub.
Then align the other side.
Lift a little more and connect the bleed hose to the nipple on the final drive housing. Check that the hose is secured to the rear axle member by the tie strap and that it is not kinked.
Installing the final drive
Press the final drive up against the rear axle member. Align all screws.
Lightly tighten the screws alternately.
Tighten the 8 screws for the cover. See Tightening torque [1][2]Specifications.
Tighten the M12 screw for the front bushing in the final drive housing.
Remove the jack.
Connect the connector to the wiring harness for the Active on Demand coupling.
Installing the anti-roll bar on the rear axle member (both sides)
Install 2 x M12 new lock nuts. Tighten.
Note! Make sure that the cable for the parking brake passes above the ends of the anti-roll bar. Press the cables into place in the mountings on the heat shield plate.
Installing control arms and track rods (both sides)
Raise the wheel bearing housing so that the hole for the control arm in the bearing housing and rear axle member is horizontal.
Install:
- the control arm with new M12 screws. Tighten
- the tie rod to the wheel bearing housing. Use new lock nuts, M12. Tighten
- the parking brake cable in the bracket on the tie rod and in its mountings in the lower cover. Tighten. See Tightening torque Tightening Torque.
Installing shock absorbers, lateral links and anti-roll bar links (both sides)
Press the control arm downwards when the shock absorber is being installed. Use a crow bar.
Install:
- the shock absorbers on the control arms. Do not tighten the screw
- the screw for the lateral link/wheel bearing housing. Do not tighten the screw
- the link to the anti-roll bar on both sides. Use a new nut. Tighten.
Caution! For certain versions, remove the levers for the level sensor from the control arm(s).
Note! The level sensor may be installed on both the right and left side.
Installing the propeller shaft
Install the propeller shaft using the marking made earlier. See For cars with a vibration damper on the Active on Demand Coupling flange.
Check carefully that the mating surfaces on the propeller shaft and flange are clean.
Use new screws when installing the propeller shaft. First tighten the screws that are opposite each other according to Tightening torque Tightening Torque. Then tighten all screws crosswise according to Tightening torque Tightening Torque. Use counterhold 999 7057 Counterhold 999 7057 Counterhold.
Install:
- the 4 x M8 screws for the support for the center bearing on the car body. Tighten
- the 2 x M8 screws for the propeller shaft center bearing. Tighten.
For cars with a vibration damper on the Active on Demand Coupling flange
Use counterhold 951 2940 Counterhold 951 2940 Counterhold.
Install:
- the 4 x M8 screws for the support for the center bearing on the car body. Tighten
- the 2 x M8 screws for the propeller shaft center bearing. Tighten.
Filling and checking the oil in the final drive
Fill the final drive with oil. Check the oil level. P/N 116 1620-8 (1 liter container)
Tighten the filler plug according to Tightening torque Tightening Torque.
Volume approx. 0.5 l.
Fill oil up to the filler plug. Suck out 0.1 l oil.
Filling and checking the oil in the Active on Demand Coupling
Use correct oil according to applicable specifications.
Tighten the filler plug according to Tightening torque Tightening Torque.
Volume approx. 650 ml.
Fill oil up to the filler plug. Suck out 0.1 l oil.
Caution! If the AOC (Active on Demand Coupling) has been replaced with a new one, the car must be driven carefully in tight circles in both directions and then driven for a few kilometres after the oil is filled. Top up the oil level and check again according to the above.
Installing the rear section of the exhaust system
Install:
- the mountings for the exhaust system in the rear axle member, M8
- the exhaust system to the front exhaust pipe/three-way catalytic converter (TWC). Use a new gasket and new nuts, M8
- the mountings in the rear axle member and body.
Installing the rear wheels. Tightening shock absorbers and lateral links
Install:
- the M10 screws for the drive shafts on both sides. Use new screws. Tighten
- the rear wheels. See Installing wheels Service and Repair.
Position the car on a wheel track hoist.
Tighten the M12 screws for the shock absorbers and torque rods on both sides.
Install the protective covers over the shock absorber mounting.
Note! Check and adjust the rear wheel alignment if necessary. See Wheel alignment, checking / adjusting Service and Repair.