BMW Coupes and Sedans 1970-1988 Repair Guide

Transmission

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REMOVAL & INSTALLATION



3-Speed Models

See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the accelerator cable.
  4.  
  5. On 4-cylinder engines remove all of the transmission mounting bolts which are accessible from the engine compartment.
  6.  
  7. Raise and support the vehicle safely on jackstands.
  8.  
  9. Detach the transmission fluid filler neck and drain the fluid into a suitable container.
  10.  
  11. On 4-cylinder engines, remove the exhaust pipe support bracket and separate the pipe from the exhaust manifold. On 318i and 325 models, remove the entire exhaust system and detach the heat shield.
  12.  
  13. On 6-cylinder engines except 733i models, remove the entire exhaust system.
  14.  
  15. Detach the oil cooler lines from the transmission, if equipped, and drain fluid into a container.
  16.  
  17. Disconnect the driveshaft at the transmission, On 733i models, use a clamping tool around the coupler. On 318i and 325 models, disconnect the selector rod from the transmission.
  18.  
  19. Disconnect the speedometer cable.
  20.  
  21. Remove the center bearing and bend down the driveshaft and pull off.
  22.  
  23. Remove the torque converter cover and remove the 4 bolts that attach the torque converter to the drive plate. Turn the engine for this procedure, using the vibration damper.
  24.  
  25. Use paint to mark identification points on the speed and reference sensors, then remove. If the tips are dirty, clean with a rag
  26.  
  27. Support the transmission and disconnect the crossmember at the body.
  28.  
  29. Remove the remaining transmission mounting bolts.
  30.  
  31. Separate the transmission from the engine and take off the torque converter at the same time. On 1983-88 733i and 735i models, this is done by removing the protective grill on the side of the converter housing and gently prying it toward the transmission as it is pulled rearward. On 318i models, lower the transmission onto the front axle carrier. Remove the grill from the torque converter housing and gently pry the torque converter backwards as the transmission is pulled off.
  32.  



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Fig. Fig. 1: The speed sensor (1), is installed in the (D) location, while the reference sensor (2) is installed in the (B) location

To install:
  1. Install the transmission into the vehicle and push the torque converter back against the stop on the transmission and rotate it to align the bolt holes with the drive plate holes before installing.
  2.  

On 1983-88 733i and 735i models, the drive connections on the front of the converter must be indented inside the converter housing at least 0.3 inches (9mm).

  1. Install the speed transmitter and reference sensors. The speed sensor faces the gear ring. The reference transmitter faces the flywheel. The engine will not start if the plugs are installed wrong.
  2.  
  3. Install the driveshaft, using new locknuts on the driveshaft flexible giubo coupling. Tighten the driveplate bolts to 16-17 ft. lb. (21-22 Nm).
  4.  
  5. Install the exhaust suspension without twisting. When installing the driveshaft center bearing, preload the center bearing 0.8 inches (2mm).
  6.  
  7. Make sure the torque converter is positioned correctly before installing. Fill the transmission with new fluid.
  8.  
  9. Lower the vehicle and connect the negative battery cable.
  10.  

4-Speed Automatic
EXCEPT 3 SERIES MODELS

To perform this operation, a support for the transmission, BMW tool 24 0 120 and 00 2 020 or equivalent and a tool for tightening the driveshaft locking ring, BMW tool 26 1 040 or equivalent are required. If the vehicle has a 6-cylinder engine, a special socket (which retains the bolts) 24 1 110 or equivalent will be needed.

  1. Disconnect the battery ground cable.
  2.  
  3. Loosen the throttle cable adjusting nuts and release the cable tension. Disconnect the cable at the throttle lever. Then, remove the nuts, and pull the cable housing out of the bracket.
  4.  
  5. Raise and safely support the vehicle on jackstands.
  6.  
  7. Disconnect the exhaust system at the manifold and hangers, then lower it out of the way. Remove the hanger that runs across and under the driveshaft. Remove the exhaust heat shield.
  8.  
  9. Support the transmission via a floorjack and BMW tool 24 0 120 which goes under the transmission oil pan. When installed, remove the crossmember which supports the transmission at the rear.
  10.  
  11. Remove the driveshaft giubo coupling through bolts and nuts. Discard the used self-locking coupling nuts.
  12.  
  13. Unscrew the transmission locking ring at the center mount (if equipped). Then, remove the bolts and center mount. Bend the driveshaft downward and pull it off the centering pin. Suspend it with wire from the underside of the car.
  14.  
  15. Drain the transmission fluid and discard it. Remove the fluid filler neck. Disconnect the oil cooler lines at the transmission, if equipped, by unscrewing the flare nuts and plug the open connections.
  16.  
  17. Remove the converter cover by removing the Torx® bolts from behind as well as the bolts from underneath. On 6-cylinder equipped models pull the cover out of the bottom of the transmission housing, just behind the oil pan.
  18.  
  19. Remove the bolts fastening the torque converter to the drive plate, turning the flywheel as necessary to gain access from below. Use a special socket (that retains the bolts) 24 1 110 or equivalent on cars with the 6-cylinder engine.
  20.  
  21. If equipped, remove the guard for the speed and reference mark sensors. Paint location marks on each sensor, then remove the attaching bolt for each and lift out each sensor.
  22.  

Vehicles equipped with a diesel engine are equipped only with a reference mark sensor.

  1. Check the condition of each sensor and clean if needed.
  2.  
  3. Disconnect the shift cable by loosening the locknut fastening it to the shift lever and disconnecting the cable at the cable housing bracket.
  4.  
  5. If the transmission has an electrical connection, turn the bayonet fastener to the left to release the harness.
  6.  
  7. Lower the transmission as far as possible. Then, remove all the Torx® or standard type bolts attaching the transmission to the engine.
  8.  
  9. Remove the small grill from the bottom of the transmission. Then press the converter off with a large screwdriver passing through this opening while sliding the transmission out.
  10.  

To install:
  1. Install the transmission and observe the following points:
    1. Make sure the converter is fully installed onto the transmission, such that the ring on the front is inside the edge of the case.
    2.  
    3. When reinstalling the driveshaft, tighten the lockring with special tool 26 1 040 or equivalent.
    4.  
    5. If the driveshaft has a simple coupling (524td), make sure to replace the self-locking nuts and to hold the bolts still while tightening the nuts to keep from distorting the coupling.
    6.  
    7. When installing the center mount, preload it forward 0.1-0.2 inches (4-6mm).
    8.  
    9. Adjust the throttle cables.
    10.  

  2.  

3 SERIES MODELS

To perform this operation, a support for the transmission, BMW tool 24 0 120 and 00 2 020 or equivalent and a tool for tightening the driveshaft locking ring, BMW tool 26 1 040 or equivalent, are required.

  1. Disconnect the battery ground cable. Loosen the throttle cable adjusting nuts, release the cable tension, and disconnect the cable at the throttle lever. Then, remove the nuts, and pull the cable housing out of the bracket.
  2.  
  3. Raise and safely support the vehicle on jackstands.
  4.  
  5. Disconnect the exhaust system at the manifold and hangers and lower. Remove the hanger bracket that runs across and above the driveshaft. Remove the exhaust heat shield from under the center of the vehicle.
  6.  
  7. On the 325iX, remove the transfer case from the rear of the transmission.
  8.  
  9. Drain the transmission fluid into a suitable container and discard it. Remove the fluid filler neck. Disconnect the oil cooler lines at the transmission, if equipped, by unscrewing the flare nuts and plug the open connections.
  10.  
  11. Support the transmission with a floorjack, transmission jack or other suitable tool. Separate the torque converter housing from the transmission by removing the Torx® bolts and the regular bolts from the bottom and sides of the transmission. Retain the washers used with the Torx® bolts.
  12.  
  13. On the 325iX, disconnect the front driveshaft.
  14.  
  15. Remove the bolts attaching the torque converter housing to the engine, making sure to retain the spacer used behind one of the bolts. Then, loosen the mounting bolts for the oil level switch just enough so the plate can be removed while pushing the switch mounting bracket to one side.
  16.  
  17. Remove the bolts attaching the torque converter to the drive plate. Turn the flywheel as necessary to gain access to each of the bolts. Make sure to re-use the same bolts and retain the washers.
  18.  
  19. To remove the speed and reference mark sensors, paint identification marks on each sensor, then remove the attaching bolt for each and slide out. Keep the sensors clean.
  20.  
  21. Turn the bayonet type electrical connector counterclockwise and unfasten the plug out of the socket. Lift the wiring harness out of the harness bails.
  22.  
  23. While supporting the transmission securely, remove the crossmember that supports the transmission at the rear.
  24.  
  25. Disconnect the transmission shift rod.
  26.  
  27. Remove the nuts and through bolts from the damper-type U-joint at the front of the transmission.
  28.  
  29. Unscrew the driveshaft spline locking ring at the center mount, if equipped, using the BMW special tool or equivalent. Remove the nuts from the center mount and lower the center mount. Bend the driveshaft downward and pull it off the centering pin. Suspend it with wire from the underside of the vehicle.
  30.  
  31. Lower the transmission as far as possible. Then, remove all the Torx® or standard type bolts attaching the transmission to the engine.
  32.  
  33. Remove the small grill from the bottom of the transmission. Then press the converter off with a large prytool passing through this opening while sliding the transmission out.
  34.  

To install:
  1. Install the transmission in position under the vehicle and raise it up into place. Observe the following points:
    1. Make sure the converter is fully installed onto the transmission, such that the ring on the front is inside the edge of the case. Only use M10x16mm bolts as originally equipped or damage may occur.
    2.  
    3. When reinstalling the driveshaft, tighten the lockring with the proper tool.
    4.  
    5. Make sure to replace the self-locking nuts on the driveshaft flexible U-joint and to hold the bolt while tightening the nuts to keep from distorting it.
    6.  
    7. When installing the center mount, preload it forward 0.1-0.2 inches 4-6mm).
    8.  
    9. When reconnecting the bayonet type electrical connector, make sure the alignment marks are correct after the plug it twisted into its final position.
    10.  
    11. When reinstalling the speed and reference mark sensors, inspect the O-rings used on the sensors and install new ones, if needed. Make sure to install the speed sensor into the bore marked D and the reference mark sensor, which is marked with a ring, into the bore marked B.
    12.  
    13. Tighten the crossmember mounting bolts to 16-17 ft. lbs. (21-23 Nm).
    14.  
    15. If O-rings are used with the transmission oil cooler connections, replace them.
    16.  
    17. Adjust the throttle cables.
    18.  

  2.  
  3. Connect the negative battery cable.
  4.  

 
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