The following description refers to the operations associated with this process. To repair the gearbox and drive, it is necessary to use special tools and therefore you should not try to disassemble the gearbox, because. without these devices, it will be impossible to assemble it.
Attention. As with two-wheel drive vehicles, different gearboxes are used. When installing a non-new gearbox, you should pay attention to this.
Wiring diagram of rear wheel drive parts
1 Gearbox cover
2 spring
3 Differential
4 Needle bearing
5 Ball bearing
6, 7 Retaining rings
8 Mounting sleeve
9 Retaining ring
10 Ball bearing for flange shaft
11 Differential cover
12 TORX head bolt, 25 Nm
13 Flange shaft seal
14 Vibration damper
15 TORX head bolt, 25 Nm
16 Retaining ring
17 Flange shaft
18 O-ring
19 Plug cap.
20 Retaining ring
Removal and installation
The removal and installation of the gearbox is carried out in accordance with the instructions of the previous chapter. Additionally, you need to unscrew the cardan shaft from the drive to the rear wheels (rear axle flange). The tightening torques, length and location of the bolts between the engine and gearbox must be observed in accordance with the gearbox already described.
Removal and installation of the case from differentials
Lid, i.e. case for differential (11) can be removed together with the differential. The differential cannot be repaired, that is, in the event of a breakdown, it is replaced with a new one.
When removing and installing, be guided by the wiring diagram, observing the following conditions.
shaft flange (17) fastened on the inside with a retaining ring, which opens with special pliers for retaining rings. However, the circlip must not be opened too wide. After that, you can pull out the shaft flange. After installation, you need to plant the ring well on the bottom of the groove.
Needle bearing (4) must be removed with a suitable puller and a special hammer, and installed with a suitable mandrel.
ball bearing (O) it is pressed out after placing a suitable plate from the differential, because The differential is pressed out through a ball bearing. A suitable piece of pipe is used for pressing.
ball bearing (10) for the flange shaft, it is pressed out with a suitable piece of pipe from the outside to the inside and pressed in from the opposite side.
Lid (11) must be lubricated with AMV188 001 1 sealant before installation on the housing.
TORX bolt (12) tighten to 25 Nm. The bolt must be 42 mm long.
Oil seal for flange shaft (13) pulled out with a curved lever. Press in a new oil seal using a suitable rod until the outer plane is 2.0 mm below the cover surface.
TORX bolt (15) tighten to 25 Nm. The bolt is 38mm long.
Sealing ring (8) always replace and lubricate with grease before installation.
To remove the cap (19) screw the M8 bolt into the thread on the cap and pull out the cap (2). Remove the retaining ring first (1).
Rear axle lock
Whereas early Quattro models were equipped with a mechanical rear-wheel drive differential lock (actuated pneumatically), then for the A4 this is done using an electronic differential lock, those. using the EDS system. This device works in connection with the anti-lock brake system (ABS). His work is briefly described in the chapter "Brake system".
Switch mechanism
Everything that was said in the previous chapter about the shift mechanism of a five-speed gearbox in two-wheel drive vehicles also applies to Quattro models.
If there are difficulties when shifting gears, then you need to follow the instructions given in the previous chapter.
Gearbox oil level
To check the oil level and add it, follow the instructions of the previous chapter.
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