BMW 1989-1995 525i Service Manual page 314

33 1-2
F INAL DRIVE
Final drive, removing and installing
The final drive unit is supported at three points on the sus -
pension crossmember through rubber bushings. New self -
locking nuts should always be used when re-attaching the
driveshaftto the final drive .
Installation is the reverse of removal. Position the final drive in
place aga inst its mounts and loosely install the front mounting
bolt to locate the unit. Then install the left and right rear bolts.
Use new self-locking nuts when reconnecting the driveshaft
and align marks made during removal. Torque nuts. while hold-
ing bolts. Check final drive oil level and add or fill as necessary.
1. Raise rear of car and support it securely. Tightening torques are listed below .
2. Dra in oil from fina l drive unit. as necessary. See Final
d rive o il, replacing.
3. Make matching marks on driveshaft and final drive in -
put flange. Remove bolts and nuts that ho ld driveshaft
to final drive. Push driveshaft forward slightly and sus-
pend from body with still wire .
CAUTION -
Do not let the driveshaft
or
drive axles hang utt-
supported. Damage to the driveshalt center beer-
ing or drive axle outer CV j oint could result .
CAUTlON -
Do not reuse sell·locking nuts. These nuts are de-
signed to be used only once and should be reo
placed whenever they are removed.
NOTE -
When installing
a
new or BMW remanulactured linal
drive unit. special breek -ln procedures apply. During
the lirst t .000 Km (620 miles). the car should be driven
at dillerent engine and road speeds . bul never exceed-
ing 213 rds 01 the maximum speed.
Tightening Torques
• Final dr ive to subframe 123 Nm (9 1 It-Ib)
• Fina l dr ive to rubber moun ts 77 Nm (57 1t·lb)
• Drive axle to final drive
M10 83 Nm (6 1 ft-lb)
M10 with locking teeth (always
replace bolts and washers) 96 Nm (70 ft-Ib)
• Driveshalt to final
drive flange See 260 Drives ha lt
• Speedometer sender to fina l dr ive 10 Nm (89 in-Ib)
• Oil drain and fill plug 70 Nm (52 ft-lb)
Final drive rubber mounts, replacing
Final Drive Oil Seals 0011745
~
Repl acement of the rubber bushings for the final drive reo
~~~~~~~~~~~I
quires special bushing press tools to remove and install the
, bushings into the suspension crossmember. The thre e bush -
ings (front. left and right rear) are accessible after removing
the fina l dr ive unit. When replacing the old bushings. note the
installation direction of the bushings before removing them .
4. Disconnect drive axles from final drive and suspend
from body with still wire . See 330 Rea r Suspension.
5. Place jack beneath final drive unit and support weig ht
of unit.
6. Remove front final drive mounting bolt. See Fig . 2.
Fig . 2. Final drive mounting bolts (arrow s).
7. Disconnect wires for speedometer pu lse sender and
remove wiring harness and connector from final drive
housing .
Low oil level caused by a faulty fina l drive oil seal may be
the cause of noisy operation or limited-slip ch atter. The drive
flange (side) oil sea ls can be replaced while the final drive is
installed. The input shaft (front) oil seal can only be replaced
once the final drive unit is removed .
8. Remove rear final drive mounting bolts (left and right).
See Fig. 2.
NOTE -
Do not mistake leaking CV joints lor /lange seal teaks.
It may be helplul to degrease the /inal drive to pinpoint
the source 01 the leak prior to replacing seals.
FINAL DRIVE SERVICE