BMW 3 (E46). Manual — part 167
331-3
Rear Differential
All rear differential work requires some
method of raising the car and
supporting it securely while the work is
performed. Jack stands and a floor jack
can easily be used, but use extreme
caution when working beneath the car.
See
010 General
.
Note:
Removal of rear subframe (differential
carrier) is covered in
330 Rear
Suspension
.
Rear differential oil, checking
and filling
Note:
BMW supplies the E46 rear differential
with lifetime lubricant.
To check rear differential oil level:
Remove oil filler plug.
Insert finger into fill hole. If finger
is wetted from oil, level is correct.
Note:
Use a 14 mm Allen socket to remove
the fill or drain plug. Alternatively, cut
approximately 30 mm (1.2 in) from an
Allen key and use a box end wrench on
the key stub.
-
If necessary, fill differential with
appropriate type and quantity of
lubricant.
Note:
The differential fluid level is correct
when the fluid begins to spill from the
fill plug.
-
Install and tighten fill plug.
Differential oil
Differential oil capacity
Rear wheel drive
0.9 liter (0.95 US
qt.)
All wheel drive
1.0 liter (1.06 US
qt.)
Oil specification
BMW SAF-XO
synthetic oil
Tightening torques
Differential drain or
fill plug
70 Nm (52 ft-lb)
Rear differential, removing and
installing
-
Raise rear end of car and support
it securely on jack stands.
WARNING!
Make sure that the car is firmly
supported on jack stands designed
for the purpose. Place the jack
stands beneath a structural chassis
point. Do not place jack stands
under suspension parts.
-
Remove rear drive axles.
-
If necessary, drain differential oil.
Remove rear suspension reinforcement
brace:
Remove heat shield between
reinforcement brace and exhaust
pipe.
Remove bolts (A) mounting brace
to undercarriage.
Remove nuts (B) mounting brace
and front of rear subframe to
undercarriage.
Lower and remove reinforcement.
Note:
If necessary, tilt rear half of exhaust
system down. Support exhaust system
securely.
-
Detach driveshaft from differential
input shaft flange and suspend.
See
260 Driveshaft
.
CAUTION!
Suspend the detached drive axle
from the car body with a stiff wire
hook to prevent damage to the outer
CV joint.
-
Remove rear stabilizer bar.
Support differential with transmission
jack. Remove rear (A) and front (B)
mounting bolts at subframe.
-
Slowly lower differential unit and
remove toward rear.
-
Installation is reverse of removal.
In order to prevent excess
vibration and noise, follow
sequence for tightening
differential mounting bolts:
Install bolts finger tight.
Tighten front bolts (B).
Tighten rear bolt (A).
Tightening torques
Differential drain or
fill plug
70 Nm (52 ft-lb)
Differential to rear subframe
Front mount (M12
bolts)
95 Nm (70 ft-lb)
Rear mount (M14
bolt)
174 Nm (128
ft-lb)
Drive axle to differential flange
M10x20 mm Torx
bolt
83 Nm (61 ft-lb)
M10x46 mm bolt
(black)
100 Nm (74
ft-lb)
M10x46 mm bolt
(silver) (always
replace)
80 Nm (59 ft-lb)
Driveshaft to differential flange
M10 compression
nut
64 Nm (47 ft-lb)
M10 Torx bolt
85 Nm (63 ft-lb)
Rear suspension reinforcement to
undercarriage
M12 self-locking
nut
77 Nm (57 ft-lb)
M8 bolt 8.8 grade
21 Nm (15 ft-lb)
M8 bolt 10.9 grade
30 Nm (22 ft-lb)
-
Be sure to refill differential.
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