Repair Information
The maximum possible care and cleanliness and proper tools are essential to ensure satisfactory and successful transmission repairs. The usual basic safety precautions also, naturally apply when carrying out vehicle repairs.
A number of generally applicable instructions for individual repair operations, which are otherwise mentioned at various points in the Repair Information, are summarized here.
Before working with engine running, move the selector lever to "P" and set the parking brake.
Contact Corrosion
Contact corrosion can occur if incorrect connecting elements (bolts, nuts, washers, etc.), rivets, plugs, grommets, adhesive, etc., are used.
For this reason, the manufacturer only uses compatible fasteners, coated with a special surface coating if necessary.
Rubber, plastic and adhesives also consist of non-conductive material.
These tested parts are also made available as replacement parts.
If there are any doubts as to whether parts should be reused, just install new parts.
- Accessories must be approved by AUDI AG!
- Warranty does not cover contact corrosion damage.
Environmental and disposal regulations for oil
Handle ATF, axle oil and other fluids with care. Dispose of drained ATF properly. Always follow the legal environmental and disposal regulations.
Special Tools and Equipment
For complete list of special tools, refer to the special tools used in the service procedures.
Selector mechanism emergency release
If the battery has been disconnected or is discharged and the vehicle must be towed or pushed, it will be necessary to push the shift mechanism emergency release to shift the selector lever from "P" to "N". Refer to SELECTOR MECHANISM, PERFORMING EMERGENCY RELEASE .
Transmission
- Automatic Transmission Clean Working Conditions, refer to TRANSMISSION, CLEAN WORKING CONDITIONS .
- Do not let the engine run or tow the vehicle when the oil pan is removed or when there is no ATF in the transmission.
- With the transmission removed, secure the torque converter so that it cannot fall out.
- Check installation dimension of torque converter before installing transmission TORQUE CONVERTER, INSTALLING => .
- When installing transmission, make sure that the alignment bushings are fitted correctly.
- When exchanging automatic transmission or components, all fluid levels should be checked and corrected, if necessary. Also, all transmission oil lines must be cleaned. Capacities and specifications, refer to CAPACITIES .
O-Rings, Shaft Seals, Sealing Rings And Seals
- Always replace o-rings, shaft seals, sealing rings and seals after removal.
- After removing gaskets, examine contact surface on housing/shaft for burr resulting from removal or for other signs of damage.
- Before installing radial shaft seal, fill space between sealing lips -arrow- halfway with greaseG 052 128 A1.
- The open side of the shaft seals point toward the fluid to be sealed in.
- Before installing, lightly lubricate shaft seal outer circumference and sealing lips with ATF or gear oil, depending on installation location.
- Coat o-rings with ATF before inserting to prevent crushing rings during installation.
- Always only use approved ATF. Other types of lubrication cause faults to occur in the transmission hydraulics.
- Press in new shaft seal, so that the sealing lip does not run on the same point as the sealing lip of the old shaft seal (use insertion depth tolerances).
- Replace paper gaskets, thoroughly clean sealing surfaces and completely remove old seals.
- After installing, check the relevant fluid levels and fill if necessary. Capacities and specifications CAPACITIES
Bolts and Nuts
- Loosen the bolts opposite the tightening sequence.
- Nuts and bolts which secure covers and housings should be loosened and tightened crosswise in stages if no tightening sequence is specified.
- The tightening specifications stated apply to non-oiled nuts and bolts.
- Always replace self-locking nuts and bolts.
- Use a wire brush to clean the threads of bolts that were screwed in with locking compound. Install the bolts with locking fluidAMV 185 101 A1.
- Threaded holes into which self-locking bolts or bolts coated with locking fluid are screwed, must be cleaned (e.g. tap). Otherwise there is a risk that the bolts will shear the next time they are removed.
Fasteners
- Do not overstretch the circlips.
- Always replace damaged or stretched circlips.
- The circlips must fit completely inside the groove.
- Replace the adapter sleeves. Installed position: slot is longitudinal to line of force.
Bearings
- Install needle bearings with lettered side (thicker metal) racing the fitting tool.
- Insert bearing with axle oil or ATF, depending on installation location.
- Do not interchange the outer or inner races of bearings of the same size.
- Always replace the tapered roller bearings on one shaft together and use new bearings from a single manufacturer.
Adjusting Shims
- Measure the adjusting shims at several locations with a micrometer. Tolerance variations make it possible to find the exact shim thickness required.
- Check for burrs and damage. Only install perfect shims.
Mechatronic
- Always discharge static by touching a grounded object, for example, vehicle ground, before touching or removing the Mechatronic unit.
- Connector terminals in connector must not be touched by hand under any circumstances because control module and therefore Mechatronic may be destroyed by static discharge.
- Replace the transmission if any of the shift elements are scorched.
- Allocate the Mechatronic to the transmission code.
Guided Fault Finding, OBD and Test Instruments
Before performing repairs on the automatic transmission, the malfunction cause must be determined as exactly as possible via the Vehicle Diagnostic, Testing and Information System VAS 5051B in the operating modes "Guided Fault Finding ", "Vehicle Self-Diagnosis" and "Test Instruments".