2001 BMW 525i Final drive

Downloaded from www.Manualslib.com manuals search engine
230-14
I Manual Transmission
If installing new output flange: Recalculate thickness of
shims based on difference in height between output shaft
surface and collar nut support surface. Shims must be within
the output flange preload specification below the collar nut
support surface.
Output flange preload Difference between heights of shaft and output 0.05
- 0.22 mm
flange sealing
suriace MINUS thickness of shims (0.002 - 0.009 in)
NOTE-
Shims are available in increasing sizes of 0.1 mm from
1.4 mm to 2.1 mm (0.055 in to 0.083 in) from BMWparts.
- Install shims. Install and torque flange collar nut.
Tightening torques Output flange to out put shaft
. Stage I 190 Nm (140 ft-lb)
. Stage II (after loosening) 120 Nm (89 it-lb)
- Use BMW special tool 23 2 470 to install flange nut retaining
plate.
- Remainder of installation is reverse of removal, noting the fol-
lowing:
Install driveshaft using new nuts. See
260 Driveshaft.
Checlc transmission fluid level, topping up as necessary.
Tightening torques
Aluminum driveshaft to flex-disc
- MI2 (use Dacromet-coated washers) 90 Nm (66 ft-lb)
Driveshaft
CV joint to final drive flange
MI0 (Tom bolt)
70 Nm (51 ft-lb)
M8 (compression nut) 32 Nm (24 ft-lb)
Flex-disc to transmission flange or driveshaft
* MI0 (8.8 grade) 48 Nm (35 ft-lb)
- MI0 (10.9 grade) 60 Nm (44 ft-lb)
. MI2 (8.8 grade)
81 Nm (60 ft-lb)
MI2 (10.9 grade) 100 Nm (74 ft-lb)
- MI4 140 Nm (1 03 ft-lb)
Transmission
crossmembe~
to transmission (ME)
to chassis (M10)
21 Nm (15 ft-lb)
42 Nm (30 it-lb)

Downloaded from www.Manualslib.com manuals search engine
240-1 3
Automatic ~ransmissionl
- Blow out oil cooler lines with low-pressure compressed air
and flush cooler with clean ATF twice before reattaching lines
to transmission.
CA UTIOG
Wear safety glasses when worling with compressed air:
@ Do not reuse ATF used for flushing.
- Remainder of installation is reverse of removal, noting the fol-
lowing:
Reinstall driveshafl using new nuts.
Install new sealing washers on transmission cooling line
banjo bolts.
Install new O-rings on transmission cooler lines, where
applicable.
Inspect engine drive plate (flywheel) for cracks or elongat-
ed holes. Replace
if necessary.
Be sure bellhousing alignment dowel sleeves are located
correctly. Replace damaged sleeves.
Checlc to be sure torque converter is seated correctly in
transmission during final installation.
Use
BMW special tool 24 2 300 to align three mounting
tabs on torque converter with indentations on drive plate
(flywheel).
Fill transmission with clean ATF until oil level is even with
fill hole. Then check fluid level as described earlier.
Adjust gearshift mechanism. See
250 Gearshift Linkage.
NOTE-
In order to avoid difficulties in transmission removal at a fu-
ture time, use washers with Torx-head mounting bolts.

Downloaded from www.Manualslib.com manuals search engine
Gearshift Linkage
- Connect selector rod to shift lever. Lift transmission, install
crossmember and tighten crossmember bolts.
Install driveshaft and heat shield. See
260 Driveshaft.
Reinstall exhaust system. See 180 Exhaust System.
. Lower vehicle. Install shift boot. Push shift ltnob on lever.
Tightening torque
Driveshaft
CV joint to final drive flange
. MI0 (Tom bolt)
70 Nm (51 ft-lb)
. M8 (compression nut) 32 Nm (24 ft-lb) - Driveshaft clamping sleeve
- MI0 ribbed nuts
80 Nm (59 ft-lb)
MI0 compressed nuts 64 Nm (47 ft-lb)
Flex-disc to driveshaft or transmission flange
MlO (8.8 grade) 48
Nm (35 ft-lb)
. MI0 (10.9 grade) 60
Nm (44 ft-lb)
- MI2 (10.9 grade) 100 Nm (74 ft-ib)
MI4 140 Nm (103 fi-lb)
Transmission crossmember
. to transmission 21 Nm (15 ft-lb)
. to chassis 42 Nm (30 ft-lb)

Downloaded from www.Manualslib.com manuals search engine
260-2
1 Driveshaft
This repair group covers repair and replacement of the
driveshaft and driveshaft components.
Driveshaft repairs consist of replacement of front flex-disc.
center mount or rear
CV joint. If the driveshaft joint is defec-
tive, replace the complete driveshaft.
Drive axle repairs are covered in
331 Final Drive
Special tools
BMW suggests the use of certain special tools in removing,
installing or servicing the driveshaft or its components.
4 Transmission jack
(Tool No. BMW 00 2 030)
4 Transmission support (for use with transmission jack)
/ (Tool NO. BMW 23 0 040)
24 0 170
1
4 Transmission support (for use with transmission jack,
A5S 560Z transmission)
(Tool No. BMW 24
0 170)
24 0 250
I
4 Transmission support (for use with transmission jack,
A5S
4402 transmission)
(Tool No. BMW 24
0 250)
4 Drlveshaft center mount allgnlng yg
Tool No. BMW 26 1 000)

Downloaded from www.Manualslib.com manuals search engine
Driveshaft
4 Driveshaft center slide nut spanner
(Tool No. BMW
26 1 040)
7, 25 1 Ho 4 cv joint removal tool
(Tool No. BMW 26 1 11 0)
support assembly
Driveshaft description
4 The two-piece driveshaft is connected to the transmission by
a rubber flex-disc and to the rear final drive by a constant ve-
locity (CV) joint.
A universal joint is used at the center of the driveshaft and
the shaft is supported in the middle by a center support
bearing. The bearing is mounted in rubber to isolate vibra-
tion.
- The rear constant velocity joint compensates for fore and
aft movement of the drive line.
Troubleshooting
The source of driveline vibrations and noise can be difficultto pin-
point. Engine, transmission, rear axle, or wheel vibrations can be
transmitted through thedriveshaftto the car body. Noises from
thecar may be caused by final drive problems, or by faulty wheel
bearings, drive axles, or even
wom or improperly inflated tires.
NOTE-
For drive axle repair information, see 331 Final Drive
Driveshaft noise or vibration may be caused by worn
ordam-
aged components. Check the universal joint for play. With the
driveshaft installed, pull and twist the driveshaft while watch-
ing the joint. The
BMW specification for play is very small, so
almost any noticeable play could indicate a problem.
Check the torque of the fasteners at the flange connections.
Check the rubber of the flex-disc and center bearing for dete-
rioration or tearing. Check the driveshaft for broken or miss-
ing balance weights. The weights are welded tabs on the
driveshaft tubes. In addition to inspecting for faulty driveshaft
parts, the installed angles of the driveshaft should also be
considered.

Downloaded from www.Manualslib.com manuals search engine
1 Driveshaft
Further inspection requires removal of the driveshaft. Checlc
the front centering guide on the transmission output flange for
damage or
misalignment. Also check runout at the transmis-
sion output fiange and output shaft, and at the final drive input
fiange. Check the bolt hole bores in the flange for wear and
elongation.
Driveshaft flange
runout (max. allowable)
Transmission
flange
- Axial play 0.10 mm (0.004 in.)
Radial play 0.07
mm (0.003 in.)
Spin the driveshaft center bearing and
check ior smooth op-
eration without play. Check the constant velocity joint
forwear
or play. Checlc the universal joint for wear or binding. If it is
difficult to move or binds, the driveshaft section should be
replaced.
Universal joint
play
Maximum allowable 0.15
mm (0.006 in.)
NOTE-
With the driveshaft installed, the actual amount that the drive-
shaftjoint pivots is limited. For the most accurate test, check
joint
in its normal range of movement.
If inspection reveals nothing wrong with the driveshaft, it may
need to be rebalanced. This can be done by a speciality drive-
shaft repair shop. Also,
checlc driveshaft alignment as de-
scribed below.
NOTE-
Minor driveshaft vibrations can often be corrected simply by
disconnecting the driveshaft at the final drive and reposition-
ing it go", 180" or 270" in relation to the final drive input
flange.
The troubleshooting table below lists symptoms
oi driveshaft
problems and their probable causes. Most of the repair infor-
mation is contained within this repair group. There are refer-
ences to other repair groups, where applicable.

Downloaded from www.Manualslib.com manuals search engine
Driveshaft
Driveshaft problems and causes
Symptom Probable cause Corrective action
Vibration when starting off Center bearing rubber deteriorated. Inspect center bearing and rubber. Replace if necessary.
(forward or reverse)
Flex-disc damaged or worn.
Inspect flex-disc. Replace
if necessary.
Engine or transmission mounts
faulty. Inspect engine and transmission mounts. Align or
replace, if necessary.
Front centering guide worn, or driveshaft
Checic front centering guide and replace
if necessary.
mounting flanges out of round.
Check
runout of driveshaft flanges.
Universal joint worn or seized.
Check universal joint play and movement. Replace
driveshaft if necessary.
Driveshaft misaligned. Check driveshaft alignment.
Noise during onloff throttle Final
drive components worn or damaged
Remove final drive and repair. 331 Final Drive
or when engaging clutch. (excessive pinion-to-ring-gear clearance).
Drive axle or CV joint faulty.
Inspect drive axles and CV joints. Repair or replace as
necessary.
331 Final Drive
Vibration at 25 to
30 mph
Front centering guide worn, or driveshaft
Check front centering guide and replace if necessary.
(40 to 50
kmlh). mounting flanges out of round or damaged.
Check runout of driveshaft mounting flanges.
Universal joint worn or seized.
Check universal joint play and movement. Replace
driveshaft if necessary.
Flex-disc damaged or worn.
Inspect flex-disc. Replace if necessary.
Center bearing rubber deteriorated.
Inspect center bearing. Replace if necessary.
Misaligned installed position. Check driveshaft alignment.
Vibration, audible rumble Front centering guide worn, or driveshaft
Check front centering guide and replace
if necessary.
over
35 mph (60 kmlh). mounting flanges out of rouncl or damaged.
Check runout of driveshaft mounting flanges. - -
Mounting flange bolts loose or holes worn.
Remove driveshaft and check transmission output flange
and final drive input flange. Replace if necessary.
Driveshaft unbalanced. Check driveshaft for loose or missing balance weights.
Have driveshaft rebalanced or replace if necessary.
Universal ioint worn or seized.
Check universal ioint
~lav and movement. Reolace ' .. driveshaft if necessary.
Center bearing faulty.
Replace center bearing.
.
Final drive rubber mount faulty.
Inspect final drive rubber mount and repiace if necessary.
Driveshaft misaligned.
Check driveshaft alignment.

Downloaded from www.Manualslib.com manuals search engine
Driveshaft, aligning
The alignment of the driveshaft does not normally need to be
checked unless the engineltransmission or the final drive
have been removed and installed. if ail other parts of the
driveshaft have been inspected and found to be okay, but
there is still noise or vibration, driveshaft alignment should be
checked.
There are two important driveshaft alignment checks. The
first is to make sure that the driveshaft runs straight from the
transmission to the final drive, without any variation from
side-
to-side caused by misalignment of the engineltransmission in
its mounts. Make a basic check by sighting along the
drive-
shaft from back to front. Any misalignment should be appar-
ent from the center bearing forward.
To adjust the side-to-side alignment, loosen transmission or
engine mounts to reposition them, then retighten mounts.
The driveshaft should be exactly centered in driveshaft tun-
nel.
The second important driveshaft alignment check is more
complicated. It checlts the amount the driveshaft is angled
vertically at the joints. This angle is
lknown as driveshaft
deflection.
In general, there should be little deflection in the driveshaft
between the engine, the center bearing, and the final drive.
Precise checks require the use of a large protractor or some
other means of measuring the angle of the engine and the fi-
nal drive and comparing these angles to the angle of the
. . driveshaft sections.
- To change the deflection angle, shims can be placed be-
tween the center bearing and the body or between the trans-
mission and its rear support. When using shims to change a
deflection angle, keep in mind that the angle of adjacent
joints will also change. Deflection angles should be as small
as
oossible.