Removal and installation the gearbox (BMW 3 Series E36)

The description of work for a manual transmission is given. In case of differences in working operations for an automatic transmission, special instructions are given.

Removal

Disconnect the ground wire from the battery.

Caution: When the battery is disconnected, the information in the electronic memory devices, such as the engine fault memory or the radio security code memory, is erased. Disconnect the battery only when the ignition is off, so as not to damage the fuel injection system control unit. When disconnecting the battery, follow the instructions in the sections "Radio" and "Removing and installing the battery".

Note: On vehicles with six-cylinder engines, the battery is located in the luggage compartment next to the spare tire.

Raise the car.

Remove the exhaust system.

Remove the exhaust system heat shield.



If present, unscrew fasteners "1" and "2". Unscrew bracket "3" from the bottom of the car, paying attention to its installation position for subsequent installation. Wide lug "4" faces the front of the car.



Unscrew the cardan shaft joint disk from the gearbox. To avoid overtightening the joint disk, unscrew only the nuts, not the bolts.





Use a pipe wrench to loosen the threaded ring "arrow" in the middle of the cardan shaft by several turns.

Unscrew the middle support "A" of the cardan shaft.

Tilt the cardan shaft downwards and pull it out of the centering journal.

Caution: Tie up the cardan shaft, do not allow the joints to fall.

With the propeller shaft removed, disconnect the locking bracket "1" from the shift rod, remove the washers from both sides of the shift rod and pull out the rod.

Disconnect the reverse light switch wire from the rear of the gearbox.

Remove the clutch slave cylinder.

Note: Hydraulic lines remain connected.

Suspend the engine on a crane or block and tackle, see section "Removal the engine". Tighten the cable to prevent the engine from dropping after loosening the rear gearbox mount.





Unscrew the crossbar "1" from the bottom of the car and from the gearbox.

Lower the engine until it does not touch the bulkhead in the engine compartment.



Use a screwdriver to remove spring "1" from protrusion "2" on the body and tilt it upward.

Pull out the support pin.

Automatic transmission

Disconnect the gear shift cable from the gearbox.

Disconnect the electrical connector from the box by turning the knurled nut on the connector to the left. Disconnect the second, smaller RPM sensor connector by pressing the wire retainer.



Remove the cover on the side of hole "1" on the engine crankcase. Use a narrow wrench head to unscrew 3 torque converter mounting bolts one after the other, while preventing the bolts from falling into the housing. To bring the bolts to the hole, turn the engine by the hexagon of the crankshaft belt pulley.



Support the box from below with a garage jack. The box should be supported only by the body, not by the oil pan.

Unscrew the 2 brackets securing the oil lines to the oil radiator on the engine block and the engine oil pan.



Unscrew the oil line from the oil radiator.

Warning: Oil leaks, place a container underneath. Dirt should not get into the tubes, so put on plastic bags or rubber rings.

Loosen the bolts securing the gearbox to the engine. The bolt arrangement on the flange is the same as on the manual gearbox.



Secure the torque converter so that it cannot move, using pliers. Remove the box from the engine.





Loosen the gearbox bolts using socket wrenches.

Separate the gearbox from the engine and pull it out downwards with an assistant.

Installation

Check the clutch before installation.

Check the ease of movement of the release bearing. Lubricate the bearing, for example Molykote Longtherm 2. If noise was previously observed when the clutch was released, replace the release bearing.

Engage any gear.

Raise the box and insert it into the clutch in a horizontal position. If the primary shaft does not enter the clutch disk, turn it by hand by the flange under the cardan shaft.

Caution: Make sure there are two centering bushings between the engine and gearbox.

Tighten the gearbox mounting bolts on the engine with washers.

Tightening torques for bolts with Torx heads: M8 bolts - 25 Nm; m10 bolts - 45 Nm; m12 bolts - 70 Nm.

Tightening torques for conventional bolts: M8 - 25 Nm; bolts M10 -50 nm; m12 bolts - 80 Nm.

Raise the gearbox and secure it to the cross member with a bolt tightening torque of 25 Nm.

Install the slave cylinder.

Install the support pin, coating it with Kluber PoLylub GLY 801.

Using a screwdriver, place spring "1" on spout "2" (Figure W 3010).



Insert the shift rod. Place the washer on the pin and secure the shift rod with the lock washer.

Connect the reverse light switch wire.

Automatic transmission (Figure W 3025)

Pull the pliers out of the gearbox housing and screw the 3 torque converter bolts through the hole in the gearbox.

Caution: Install only bolts with M10 thread and 16 mm thread length. Insert spring washers. Tighten bolts to 45 Nm. Failure to comply with the requirements may result in destruction of the gearbox.

Remove the plugs and screw the oil pipes with new gaskets to the oil radiator.

Screw the oil pipe fasteners to the engine oil pan and engine block.

Connect the electrical wires to the box. Turn the knurled nut to the right.

Install and adjust the gear shift cable.

Pour oil into the box.

Install the cardan shaft.

Install the rear crossmember with the bolts tightening torque of 20 Nm. If equipped, install the two exhaust system fasteners on the crossmember.

Install a heat-insulating screen.

Install the exhaust system.

Check the oil level in the gearbox.

Connect the ground wire to the battery.