1990 BMW 525I Transmission Removal & Installation
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E30 3 Series 1. Disconnect the negative battery cable. Raise and safely support the vehicle. Remove the exhaust system. Remove the cross brace and heat shield. On the 325iX, remove the transfer case. 2. Hold the nuts on the front with one wrench, and remove bolts from the rear with another to disconnect the flexible coupling at the front of the driveshaft. Some vehicles have a vibration damper at this point in the drivetrain. This damper is mounted on the transmission output flange with bolts that are pressed into the damper. On these vehicles, unscrew and remove the nuts located behind the damper. 3. Loosen the threaded sleeve on the driveshaft. Get a special tool to hold the splined portion of the shaft while turning the sleeve.
E30 3 Series 1. Disconnect the negative battery cable. Raise and safely support the vehicle. Remove the exhaust system. Remove the cross brace and heat shield. On the 325iX, remove the transfer case. 2. Hold the nuts on the front with one wrench, and remove bolts from the rear with another to disconnect the flexible coupling at the front of the driveshaft. Some vehicles have a vibration damper at this point in the drivetrain. This damper is mounted on the transmission output flange with bolts that are pressed into the damper. On these vehicles, unscrew and remove the nuts located behind the damper. 3. Loosen the threaded sleeve on the driveshaft. Get a special tool to hold the splined portion of the shaft while turning the sleeve.
4. Remove its mounting bolts and remove the center driveshaft mount.
Then, bend the driveshaft down at the center and pull it off the transmission
output flange. Keep the sections of the driveshaft from pulling apart
and suspend it from the vehicle with wire. 5. Remove the retainer and
washer, and pull out the shift selector rod. 6. Use a hex-head wrench
to remove the self-locking bolts that retain the shift rod bracket at the rear of the transmission and then remove the bracket. If the vehicle has a shift arm, use a screwdriver to pry the spring clip up off the boss on the transmission case and swing it upward. Then, pull out the shift shaft pin. 7. Unscrew and remove the clutch slave cylinder and support it so the hydraulic line can remain connected.
8. The transmission may incorporate sending units for flywheel rotating speed
and position. Remove the heat shield that protects these from exhaust
heat and then remove the retaining bolt for each sending unit. Note that
the speed sending unit, which has no identifying ring goes in the bore
on the right, and that the reference mark sending unit, which has a
marking ring, goes in the bore on the left. If the sending units are
installed in reverse positions, the engine will not run at all. Pull
these units out of the flywheel housing. 9. Disconnect the wiring
connector going to the backup light switch
and pull the wires out of the harness. 10. Support the transmission
from underneath in a secure manner. Remove mounting bolts and remove the
crossmember holding the rear of the transmission to the body. Then,
lower the transmission onto the front axle carrier. 11. Using the
proper tool, remove the bolts holding the transmission flywheel
housing to the engine at the front. If there is a separate clutch
bellhousing, remove the transmission to bellhousing bolts. Make sure to
retain the washers with the bolts. Pull the transmission rearward to
slide the input shaft out of the clutch disc and then lower the
transmission and remove from the vehicle.
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