Replacing the pinion seal
To replace the main gear pinion seal, you will need a torque wrench with a device for fastening to the flange of the main gear and a socket wrench 115 589 00 07 00 to loosen the flange fastening nut. A sign that the seal needs to be replaced is oil leaks in the front part of the main gear housing.
Remove the exhaust system splash guard and the exhaust system.
Loosen the clamping nut of the cardan transmission and unscrew the fastening of the intermediate support to the body floor.
Disconnect the cardan shaft flange from the main gear flange.
Measure and record the torque of the rear wheel drive. To do this, attach a torque wrench to the flange of the drive pinion using a device, set the drive pinion and axle shafts horizontally by changing the height of the supports under the rear suspension arms. Rotate the drive pinion with a torque wrench, note the readings on the scale of the wrench and record them.
Fig. 224. Measuring the torque of resistance to rotation of the rear wheel drive.
1 - torque wrench,
2 - device for the drive gear,
3 - socket wrench.
Secure the drive gear flange from turning in an accessible way and use a socket wrench to unscrew the flange mounting nut.
Material based on data from the portal: MERCEDESMAN.ru
Remove the flange and, if necessary, use a seal suitable for the transmission.
Using a screwdriver, carefully remove the oil seal from the final drive housing.
Check the sealing surface on the flange and replace the flange if worn.
Apply sealant to the outer surface of the new oil seal and carefully, without damaging the surface of the oil seal, press it into the main gear housing until it stops.
Put on the flange and slide it along the gear shaft until it stops.
Screw on a new self-locking flange nut and, alternately tightening the nut and measuring the torque of resistance to rotation, bring the torque value to the previously recorded value. It is unacceptable to tighten the fastening nut too tightly, as this will lead to deformation of the spacer sleeve on the driven gear and, as a consequence, to the need to overhaul the main gear.
Connect the cardan shaft.
Tighten the bolts securing the intermediate support to the body base without tightening them completely.
Fig. 225. Section of the drive gear.
1 - flange,
2 - self-locking nut,
3 - oil seal,
4 - tapered roller bearing,
5 - spacer sleeve,
6 - leading bevel gear,
7 - adjusting ring,
8 - tapered roller bearing,
9 - main gear housing.
Fill the main gear housing with oil up to the lower edge of the filler hole.
Roll the assembled car several times in two directions.
Tighten the driveshaft clamp nut.
Tighten the intermediate support mounting bolts.
Install the exhaust system.