If your car's radio is equipped with an anti-theft system, make sure you have entered the correct code before disconnecting the battery.
If, after connecting the battery, the inscriptions on the instrument panel appear in the wrong language, refer to Section Anti-theft audio system and instrument panel language, for instructions on how to set the desired language.
Withdrawal
1. Disconnect the negative battery cable.
2. Disconnect the throttle cable and remove it from the bracket on the intake manifold (see chapter Supply system).
3. On M10 engines, remove the ignition distributor cover to prevent damage during transmission removal when the engine is tilted back.
4. Jack up the vehicle and place it securely on axle stands.
5. Remove the exhaust system (see chapter Supply system).
6. Disconnect the selector rod from the cable (see Section Selector lever drive adjustment).
7. Remove cardan shaft (see chapter Clutch).
8. Drain the fluid from the transmission (see chapter Car maintenance). Remove the fill tube and disconnect the coolant lines.
9. Plug open lines to prevent dirt from entering the transmission.
10. On 3HP 22 transmissions, remove the transmission cover at the bottom of the dome. On other model transmissions, remove the stiffener and transmission shock stop at the bottom of the dome.
11. Through the hole in the dome, give the bolts that secure the rotation converter to the drive disk. There are four such bolts on 3HP 22 transmissions; on 4NR 22 - three. If necessary, rotate the engine so that all bolts are visible.
12. On vehicles with the Motronic fuel injection system, remove the speed and crankshaft position sensors installed in the transmission dome (see chapter Ignition system).
13. On vehicles equipped with 4HP 22 EH transmissions, disconnect the control unit electrical connector on the left side of the transmission, directly above the transmission oil pan.
14. Support the transmission from below with a dedicated transmission or wheeled jack by placing a block of wood between the jack head and the transmission sump to protect the sump. Remove the rear transmission support and, if provided, the reinforcing beam, giving the bolts of their fastening to the body. Lower the engine and transmission onto the front carrier axle.
To prevent damage to the rotary converter or transmission, do not allow the converter shaft to support the weight of the transmission.
15. Give bolts of fastening of a dome of transmission to the engine.
16. To access the rotation transducer, remove the viewing grill on the side of the dome. Using a lever to hold the rotation converter securely attached to the transmission, separate the transmission from the engine.
17. If installing a new or remanufactured transmission, remove the rotation converter from the old one and install it on the new transmission. To remove the converter from an old transmission, insert two long bolts half way into the converter mounting holes and pull both bolts evenly. To install the transducer, see Section Replacement of oil seals, paragraph 6.
Installation
Installation is generally done in the reverse order of removal, but remember the following:
1. Tighten the rotation transducer bolts to the correct torque.
2. Before connecting coolant lines, blow them out with compressed air, then flush with clean fluid to remove friction pad particles that could clog a new or remanufactured transmission.
3. Use a new gasket on the transmission sump drain plug and a new O-ring on the fill tube to sump connection.
4. When connecting the control unit connector on 4HP 22 EH transmissions, make sure that the marks are aligned.
5. Fill the transmission with new clean fluid (see chapter Car maintenance).
6. Adjust selector lever drive and throttle cable (see Sections. Selector lever drive adjustment and Throttle cable adjustment).