General Repair Information

• The highest level of care and cleanliness along with tools that function properly are required to ensure a proper and successful transmission repair. Of course the general safety precautions also apply when carrying out repair work.
• Some general repair information that applies to several procedures throughout this information is summarized here. They apply to this repair information.

Removing bolts and nuts is generally allowed using an impact wrench. Procedures within an open high-voltage battery is excluded from this. Generally no impact wrench is permitted for these procedures.

If the following requirements are met, using an impact wrench to screw in bolts and nuts is permitted during repair procedures. Electric and compressed air impact wrenches are generally intended here.

Requirements:

• Bolts with locking fluid or self-locking nuts must only be screwed in at low speeds.
• Use a suitable impact wrench with an adjustable speed and torque range.
• Use suitable screwdriver bits near delicate surfaces, for example, use plastic-coated bits on aluminum rims.
• Note the Natural Gas Fuel Systems - General Information repair information when working in a natural gas fuel system area.

Application:

• Position the bolts or nuts by hand.
• Only screw in the bolts or nuts with an impact wrench until the head of the bolt or nut contacts the surface and then continue to turn using a torque wrench.
• Clean the threaded pins before removing the bolt or nut.

Guided Fault Finding, OBD and Test Instruments

• Before beginning any repair work on the transmission, determine the exact cause of the damage via Diagnostic  on the.

Special Tools

For a complete list of special tools used in the repair information. Refer to Workshop Equipment and Special Tools.

Oil, Environmental and Disposal Regulations

• Handle transmission fluid, gear oil and other fluids with care.
• Dispose of drained fluid properly.
• Follow the legal, environmental, and disposal regulations.
• Follow the instructions listed on the fluid packaging.

Transmission

• Do not run the engine or tow the vehicle when the transmission fluid pan is removed or when there is no transmission fluid.
• Thoroughly clean the connection points and the surrounding area before loosening.
• During installation, make sure the alignment sleeves are fitted correctly.

O-Rings, Gaskets and Seals

• O-rings, gaskets and seals must always be replaced.
• After removing the seals, examine the contact surface on the housing or shaft for burrs resulting from removal or for other signs of damage.
• Thoroughly clean the housing separating surfaces before assembling.
• Always replace paper gaskets, completely remove an old seal and thoroughly clean the sealing surfaces.
• Coat the seals with transmission fluid along the outer circumference and along the sealing lip to install.
• Coat the O-rings with transmission fluid or Vaseline before inserting to prevent them from being crushed during assembly.
• Do not use any other lubricants in the transmission fluid area. Otherwise there is a danger of the hydraulic transmission control malfunctioning.
• The open side of the gaskets point toward the fluid to be sealed in.
• When installing the new shaft seal, make sure the sealing lip does not run on the same point as the sealing lip from the old seal (use press-in depth tolerance).
• Follow the guidelines for clean working conditions. Refer to GUIDELINES FOR CLEAN WORKING CONDITIONS .

Circlips

• Do not stretch the circlips.
• Replace damaged or stretched circlips.
• The circlips must rest at the bottom of the groove.

Bolts and Nuts

• Loosen the bolts opposite the tightening sequence.
• Bolts or nuts for securing covers and housings should be loosened and tightened diagonally in stages if no tightening sequence is specified.
• Replace the self-locking nuts.
• The blind hole threads must be free of oil or debris.
• Use a wire brush to clean the threads of the bolts that were installed with locking fluid. Then insert the bolts with Locking Fluid: AMV 185 101 A1  .
• The tightening specifications given apply to unoiled bolts and nuts.