Transmission lines BMW 328i 1998 E36 User Guide

5
.
Remove
air
filter
housingcomplete
with
mass
air
flow
sensor
.
See113
Cylinder
HeadRemoval
and
Instal-
lation
.

6
.
Remove
oil
dipstick
guide
tube
mounting
bolt
.
Discon-
nect
oil
separator
hose
frombase
of
guide
tube
and
re-
move
tubefrom
oil
pan
(where
applicable)
.
See
Fig
.
10
.

NOTE-

The
guide
tube
is
sealed
in
the
blockusing
an
O-ring
.
Check
that
the
O-ring
comes
out
with
the
tube
.
Use
a
new
O-ring
when
installing
the
tube
.

Fig
.
10
.
Oil
dipstick
guide
tube
being
removed
.
Use
new
O-ring
(ar-
row)
during
installation
.

7
.
M50/S50US
engine
:
Using
a
clean
syringe,
remove
power
steering
fluid
from
fluid
reservoir
.
Disconnect
power
steering
fluid
lines
from
steering
rack
.
See
320
Steering
and
Wheel
Alignment
.

8
.
M52/S52US
engine
:
Unbolt
power
steering
reservoir
from
engíne,
then
tie
to
chassis
with
wire
.

9
.
Insta¡¡
engine
lifting
equipment
atfront
engine
lifting
point
and
raise
engine
approximately
5
mm
('/a
inch)
until
engineweight
is
supported
.
See
Fig
.
11
.

10
.
Workingbeneath
car,
separate
steering
column
shaft
from
steeringrack
at
universal
joint
.

"
Mark
steering
column
shaft
jointto
steering
rack
spin-

dle
.
Point
wheels
straight
ahead
before
disconnecting
shaft
from
rack
.
See
320
Steering
and
Wheel
Align-
ment
.

LUBRICATION
SYSTEM



119

Fig
.
11
.
Engine
lifting
equipment
shown
installed
acrossengíne
.

CA
UTION-

In
order
to
avoid
the
need
for
front-end
realign-
ment,
donot
unbolt
power
steering
rack
from
sus-
pension
crossmember
.

11
.
Support
suspension
crossmember
from
below
using
appropriate
jacking
equipment
.

12
.
Loosen
nuts
at
top
of
left
and
right
side
engine
mounts
.
Remove
nuts
from
bottom
of
left
and
right
side
engine
mounts
.

13
.
At
left
and
right
sides,
unbolt
control
arm
bushíng
carri-
ers
from
body
.
Disconnect
stabilizer
bar
links
fromcon-
trol
arms
.
Refer
to
Fig
.
3
.

14
.
Remove
bolts
from
left
and
right
sides
of
suspension
crossmember
and
lower
front
axle
as
far
as
possible
.

15
.
Remove
fuelline
clamping
brackets
from
oil
pan
.
On
cars
with
automatic
transmission,
remove
ATF
cooler
line
brackets
from
oil
pan
.

16
.
Remove
oil
pan
screws
.
Lower
and
remove
oil
pan
for-
ward
to
remove
.

CA
UTION-

If
the
oil
pan
does
not
separate
easily
from
the
en-
gine
cylinder
block,
a
few
taps
with
a
rubber
mallet
shouldbreak
it
free
.
Do
notpry
the
oil
pan
loose
.

OIL
PAN

121-
8



BATTERY,
STARTER,
ALTERNATOR

1f
the
solenoid
audibly
cliicks
but
the
motor
does
not
turn,



Starter,
removing
and
installing
switch
on
the
lights
andtum
the
key
to
the
start
position
.
lf
the



(6-cylinder
engine
with
lights
go
out
while
attempting
to
start,
the
battery
cable
may
be



manual
transmission)
loose
or
the
starter
may
have
a
short
circuit
.
If
the
lights
stay

on,the
solenoid
is
most
likely
atfault
.
The
starter
on
a
6-cylinder
car
with
manual
transmission
is

Starter,
removing
and
installing

(4-cylinder
engine)



1
.
Disconnect
negative
(-)
battery
cable
.

1
.
Disconnect
negative
(-)
cable
from
battery
.

CAUTION-

Prior
to
disconnecting
the
battery,
read
the
battery

disconnection
cautions
given
at
the
front
of
this

manual
on
page
viii
.

2
.
Remove
guide
tube
for
oil
dipstick
.

3
.
Raise
vehicle
.

WARNING
-

Make
sure
the
car
ís
stable
and
wefl
supported
at
all
times
.
Use
a
professional
automotive
lift
or
jack
stands
designed
forthe
purpose
.
A
floor
jack
is
not
adequate
support
.

4
.
Disconnect
wiring
from
starter
.

5
.
Remove
top
and
bottom
starter
bolts
.
Bottom
bolt
must

be
removed
from
below
car
.
Remove
starter
support

bracket,
if
applicable
.

removed
from
below
.

2
.
Raise
vehicle
.

3
.
Remove
reinforcing
cross
bracefromunder
transmís-

sion,
if
applicable
.

4
.
Remove
cover
from
fuel
filter
and
fuel
lines
on
left
side

underneath
car,
if
applicable
.
Detach
fuel
lines
and
har-

ness
connectors
from
retainingbrackets,
as
necessary

5
.
Disconnect
wiring
from
starter
.

6
.
Loosen
andremove
bolts
and
nuts
fastening
starter
to

transmission
bell
housing
and/or
engine
block
.
Remove

starter
supportbracket
.

7
.
Remove
starter
from
below
.

8
.
Check
starter
pinion
gear
and
flywheel
teeth
for
dam-

age
.

9
.
Installation
is
reverse
of
removal
.

6
.
Pull
starter
downward
and
turn
until
solenoid
is
at
top,



Tightening
Torques

then
remove
from
car
.



"
Re¡
nforcing
cross
brace

to
chassis
(M10)
..
...............
42
Nm
(31
ft-Ib)

7
.
>Check
starter
pinion
gear
and
flywheel
teeth
for
dam-



"
Starter
to
engine
block
(M10
bolt)
...
50
Nm
(37
ft-Ib)

age
.



"
Support
bracket
to
starter
(M5
nut)
...
5
Nm
(44
in-lb)

"
Support
bracket

8
.
Installation
is
reverse
of
removal
.



to
engine
block
(M10
bolt)
.........
47
Nm
(35
ft-Ib)

"
Wire
to
terminal
50
(M6
nut)
.........
6
Nm
(53
ín-Ib)

"
Wire
to
terminal
30
(M8
nut)
.........
12
Nm
(9
ft-lb)

Tightening
Torques

"
Starter
to
engine
block
(M10
bolt)
...
50
Nm
(37
ft-lb)

Wire
to
terminal
50
(M6
nut)
........
6
Nm
(53
in-lb)

"
Wire
toterminal
30
(M8
nut)
...
,
..:.
12
Nm
(9
ft-Ib)

STARTER
SERVICE

Fig
.
19
.
Coolant
pump
being
removed
.
Thread
two
M6
bolts
(arrows)
in
evenly
to
withdraw
pump
.
(Thermostat
and
hoseshavebeen
removed
tor
visual
access
.)

8
.
Installation
is
reverse
of
removal
.

"
Be
sure
to
replace
O-ring
and
gaskets
.

"
Coat
O-ring
with
lubricant
during
installation
.

Tightening
Torque

"
Coolant
pump
to
timing
chaincover

M6
...
.
...................
..
.
.
10
Nm
(89
in-lb)

M8
.
..
.
....................
.
.
.
22
Nm
(17
ft-Ib)

"
Coolant
pump
pulley

to
coolant
pump
.................
10
Nm
(89
in-lb)

RADIATOR
SERVICE

Radiator,
removing
and
installing

1
.
Drain
radiator
as
described
earlier
.

WARNING
-

Allow
cooling
system
to
cool
before
opening
ordraining
system
.

2
.
Remove
primary
cooling
fan
(belt-driven
or
electric)
as

described
earlier
.

3
.
Disconnect
coolingfan
and
leve¡
sensor
harness
con-

nectors
from
bottom
of
radiator,
where
applicable

4
.
Disconnect
harness
connector
from
auxiliary
fandual

temperature
switch
.
See
Fig
.
20
.

5
.
Disconnect
all
coolant
hoses
from
radiator
.

RADIATOR
AND
COOLING
SYSTEM



170-11

0012500

Fig
.
20
.
Cooling
fan
dual
temperatura
switch
(arrow)
on
right
sido
of
radiator
.

6
.
Where
applicable,
disconnectautomatic
transmission
fluid
(ATF)
cooler
lines
from
radiator
.
See
Fig
.
21
.

Fig
.
21
.
Automatic
transmission
fluid
(ATF)
linos
at
radiator
.

7
.
Carefully
pryout
radiator
retaining
clips
from
top
of
ra-

diator
.
See
Fig
.
22
.

8
.
Pul¡
radiator
up
and
out
of
car
.

NOTE-

The
radiator
rests
ontwo
rubber
mounts
.
Check
that

the
mounts
do
not
stick
to
the
bottomof
the
radiator
.

RADIATOR
SERVICE

210-2
CLUTCH

Clutch
hydraulic
system,

bleeding
and
flushing

If
the
clutch/brake
fluid
is
murky
or
muddy,
or
has
not
been

changed
within
the
last
two
years,
the
system
should
be

flushed
.
Flushing
the
old
fluid
from
the
clutch
lines
is
done
us-

ing
a
brake
system
pressure
bleeder
.

1
.
Remove
brake
fluíd
reservoir
cap
.
Usinga
clean
sy-

ringe,
remove
brake
fluid
from
reservoir
.
Refill
reservoir

with
clean
fluid
.

2
.
Attach
pressure
brake
bleeder
to
fluid
reservoír
.

CA
UTION-

Do
not
exceed
2
bar
(29
psi)
pressure
at
the
fluid
reservoir
when
bleeding
or
flushing
the
hydraulic
system
.

3
.
Connect
a
length
of
hose
from
clutch
slave
cylinder

bleeder
valve
lo
a
container
.
See
Fig
.
2
.

0012003
Fig
.
2
.



Clutch
slave
cylinder
bleeder
valve
on
left
side
of
transmission
(arrow)
.

4
.
Open
bleeder
valve
and
allow
brake
fluid
to
expel
until
clean
fluid
comes
out
free
of
air
bubbles
.

5
.
Close
bleeder
valve
and
disconnect
pressure
bleeding
equipment
from
fluid
reservoir
.
Hose
on
bleeder
valve
remainsconnected
.

6
.
Slowly
operate
clutch
pedal
about10
times
.
Fill
reser-
voir
with
clean
fluid
asnecessary
.

7
.
Unbolt
slavecylinder
from
transmission
.

8
.
Position
slave
cylinder
so
that
bleeder
valve
is
facing
up
(highest
point)
.

CLUTCH
HYDRAULICS

9
.
Open
bleeder
valve
and
slowly
push
slave
cylinder

pushrod
al¡
the
way
in
.
Close
bleeder
valve
and
slowly

release
pushrod
.
Repeat
procedure
until
fluid
runs
out

clear
and
without
bubbles
.

10
.
Disconnect
bleeder
hose
.
Instan
slavecylinder
lo
trans-

mission
.
Add
cleanbrake
fluid
to
reservoir
as
neces-

sary
.
Check
clutch
operation
.

Tightening
Torques

"
Clutch
slave
cylinder
to
transmission
................
..
22
Nm
(17
ft
lb)

Clutch
master
cylinder,
replacing

The
clutch
master
cylinder
is
mounted
to
the
pedal
assem-

bly,
directly
above
the
clutch
pedal
.
1
.
Disconnect
negative
(-)
cable
from
battery
.

CAUTION-

Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautionsgiven
at
the
front
of
this
manual
on
page
viii
.

2
.
Remove
brake
fluid
reservoir
cap
.
Usinga
clean
sy-

ringe,
remove
brake
fluid
from
reservoir
.

CA
UTION-

Brake
fluid
is
poisonous,
highly
corrosive
and
dan-gerous
to
the
environment
.
Wear
safety
glasses
and
rubbergloves
when
working
with
brake
fluid
.
Do
notsiphonbrake
fluid
with
your
mouth
.
Imme-
diately
clean
away
any
fluid
spilled
on
painted
sur-
faces
and
wash
with
water,
asbrake
fluid
will
remove
point
.

3
.
Disconnect
fluid
supply
hose
from
master
cylinder
.

Placea
pan
under
hose
to
catch
any
excess
fluid
.

4
.
Working
in
engine
compartment,
disconnect
fluid
line
fitting
frommaster
cylinder
.

5
.
Working
in
passenger
compartment,
remove
lower
in-
strument
panel
trim
above
pedal
cluster
.

6
.
Disconnect
clutch
pedal
from
clutch
master
cylinder
push
rod
by
removing
clevis
pin
locking
clip
and
slide
out
clevis
pin
.

7
.
Remove
master
cylinder
mounting
bolts
.
See
Fig
.
3
.

8
.
Installation
is
reverse
of
removal
.
Fill
fluid
reservoir
with
clean
fluid
.
Bleed
clutch
hydraulics
as
described
earlier
.

Connect
negative
cable
to
battery
last
.

Clutch,
inspecting
and
installing

1
.
Inspect
clutch
disc
for
wear,
cracks,
loose
rivets,
con-

tamination
or
excessive
runout
(warping)
.
Replace
if

necessary
.

2
.
Inspect
flywheel
for
scoring,
hot
spots,
cracks
or
loose

or
worn
guide
pins
.
Replace
flywheel
if
any
faults
are

found
.

WARNING
-

If
flywheel
is
removed
from
vehicle,
use
new
bolts
duríng
installation
.
The
old
stretch-typebolts
should
not
be
reused
.

3
.
Inspecttransmission
pilot
bearing
in
end
of
crankshaft
.

The
bearing
should
rotate
smoothly
without
play
.
If
nec-

essary,
replace
as
described
later
.

4
.
Inspect
and
clean
releasebearing
lever
.
Apply
a
thin

coat
of
grease
to
releasebearíng
lever
contact
points
.

See
Fig
.
9
.
Also,
lightly
lubricate
clutch
disc
splines
and

transmission
inputshaft
splínes
.

5
.
Install
pressure
plate
and
clutch
disc
.
Do
not
fully
tight-

en
bolts
.

6
.
Center
clutch
disc
on
flywheel
using
centering
tool

(BMW
special
tool
no
.
21
2
130
or
equivalent)
.
Refer
to

Fig
.
7
.

NOTE-

Be
sure
clutchdísc
is
facing
the
correct
way
.
The
new

disc
should
bemarked
engine
sfde
or
transmission
side
.
See
Fig
.
10
.

7
.
Tighten
each
bolt
one
turn
at
a
time
until
pressure
plate

is
fully
seated,
and
then
torque
to
specification
.

8
.
Remove
clutch
disc
centering
tool
.
Remove
flywheel

locking
tool
.

Fig
.
9
.



Clutch
release
lever
lubrication
points
(arrows)
.

CLUTCH
210-
5

Clutch
Clutch

pressure
disc
plate

0012026

Fig
.
10
.
Clutch
assembly
Note
clutch
disc
hub
position
during
instal-
lation
.

CLUTCH
MECHANICAL

13
.
Remove
transmission
mounting
bolts
(Torx-head)
.

Note
length
and
location
of
bolts
.
See
Fig
.
13
.

Fig
.
13
.
Transmission
mounting
bolts
.

0611642

CA
UTION-

Atno
time
should
the
weight
of
thetransmission
be
supported
by
the
transmission
inputshaft
.

NOTE
-

Washers
should
always
be
used
with
Torx-head
bolts
.

Installing
bolts
without
washers
will
make
them
difficult

to
loosen
.

MANUAL
TRANSMISSION



230-
7

Fig
.
14
.
Bellhousing
alignment
dowels
(arrows)
.

16
.
Install
driveshaft
and
preload
center
bearing
bracket
.

Usenew
nuts
when
mounting
driveshaft
to
transmis-

síon/flex
disc
and
final
drive
.
See
260
Driveshaft
.

17
.
Refill
transmission
with
appropriate
lubricant
before

starting
or
towingthe
car
.
See
Transmission
Fluid

Service
earlier
in
this
repair
group
.

14
.
Remove
transmission
by
pulling
backward
until
the
trans-



Tightening
Torques

mission
inputshaft
clears
the
clutch
disc
splines,
then



"
Reinforcing
cross
brace

pulí
downwards
.
Lower
jack
andremove
transmission
.



to
chassis
(M10)
.
...
.............
42
Nm
(31
ft-Ib)

"
Rubber
mount
to
transmission

15
.
Installation
is
reverse
of
removal,
keeping
in
mind
the



or
bracket
nut
(M8)
.
...
.
...
.......
21
Nm
(16
ft-Ib)

following
:



"
Slave
cylinder
to
transmission
......
22
Nm
(16
ft-Ib)

"
When
installing
exchange
transmission,
transfer
parts



"
Transmission
crossmember
to
chassis

from
old
unit
to
exchange
unit



M8
...............
.
.
...
..
22-24
Nm
(16-17
ft-Ib)

"
Thoroughly
clean
inputshaft
and
clutch
disc
splines
.



M10
..............
.
..
..
.......
42
Nm
(31
ft-Ib)

Lightly
lubrícate
transmission
inputshaft
before
in-



"
Transmission
to
engine
(Torx-head)

stalling
.-



M8
..
..................
..
.
..
..
22
Nm
(16
ft-Ib)

"
Be
sure
bellhousing
dowels
are
correctly
located
.
See



M10
.
.................
...
.
..
..
43
Nm
(32
ft-Ib)

Fig
.
14
.



M12
.
..................
..
.
..
..
72
Nm
(53
ft-Ib)

"
Center
rear
of
transmission
in
driveshaft
tunnel
before



"
Transmission
drain/fill
plugs
.
..
.
..
..
50
Nm
(37
ft-Ib)

tightening
transmission
support
bracket
.

TRANSMISSION
REMOVAL
AND
INSTALLATION

8
.
Disconnect
main
harness
connector
from
transmission

by
turning
its
bayonet
lock
ring
counterclockwise
.
Re-

move
wiring
harness
from
transmission
housing
.
See
Fig
.
8
.

Fig
.
8
.



Harness
connector
at
automatic
transmission
.

9
.
Where
applicable,
disconnect
harness
connector
from

speed
sensor
at
top
óf
transmission
.

10
.
Disconnect
transmission
cooler
line
clamps
from
en-

gine
.
Disconnect
lines
from
transmission
.

11
.
Support
transmission
with
transmission
jack
.
Remove

reinforcing
cross
brace
(if
applicable)
and
transmission

support
crossmember
.

NOTE-

Note
installation
positionof
support
crossmember
.

12
.
Remove
access
plug
in
cover
plate
on
right
side
of
en-

gine
block
and
remove
torqueconverter
bolts
.
Turn

crankshaft
to
access
boits
.
See
Fig
.
9
.

AUTOMATIC
TRANSMISSION



240-
5

Bellhousing
access
hole

Socket
wrench

Fig
.
9
.



Access
andremove
torque
converter
boits
through
hole
in
bellhousing
cover
.

0

A

fij
13
.
Remove
bellhousing-to-engine
mounting
bolts
.
See



Fig
.
10
.
Transmission-to-engine
Torx-head
mounting
bolts
.
Fig
.
10
.

0012592

TRANSMISSION
REMOVAL
AND
INSTALLATION

240-
6



AUTOMATIC
TRANSMISSION

14
.
Remove
transmission
by
pulling
back
and
down
.
Lower

jack
to
allow
transmission
to
clear
vehicle
.



Tightening
Torques

"
ATF
drain
plug
to
ATF
sump

CA
UTION-



MS
270R/A4S
310R
....
..
....
.
..
25
Nm
(18
ft-Ib)

Do
not
allow
the
torque
converter
to
fati
off
the



ASS
310Z(M10
plug)
..
..
..
.
.
..
.
..
16
Nm
(12
ft-Ib)

transmission
inputshaft
.



"
ATF
fill
plug
to
ATF
sump

MS
270R/A4S
310R
..
..
....
..
..
.
33
Nm
(24
ft-Ib)

15
.
Installation
is
reverse
of
removal,
noting
the
following
:



MS
310Z(M30
plug)
......
.
.
..
.
.
100
Nm
(74
ft-Ib)

"Blowoutofcoolerlineswithlow-pressurecompressed



"
ATF
cooler
lines
(A4S
270R/A4S
310R)

air
and
flush
coolerwith
clean
ATF
twice
before
reat-



Coupling
nuts
............
.
.
..
..
.
20
Nm
(15
ft-Ib)

taching
lines
to
transmission
.



Hollow
bolts
.........
.
.....
..
..
.
37
Nm
(28
ft-Ib)

"
Reinforcing
cross
brace

CAUTION-



to
chassis
(M10)
.............
.
..
.
42
Nm
(31
ft-Ib)

"
Wear
safety
glasses
when
working
with
com-



"
Torque
converter

pressedair
.



to
driveplate
(M10)
.........
..
.
..
45
Nm
(33
ft-Ib)

"
Transmissionsupport
crossmember
to
chassis

"
Do
not
reuse
ATF
after
flushing
.



M8
......................
22-24
Nm
(16-17
ft-1b)

M10
................
.
....
..
.
..
42
Nm
(31
ft-Ib)

"
Install
new
sealing
washers
on
hollow
bolts
.



"
Transmissíon
to
engine
(Torx-head
with
washer)

"
Insta¡¡
new
O-rings
on
transmission
cooler
lines,
where



M8
......................
..
.
..
21
Nm
(15
ft-Ib)

applicable
.



M10
.....................
..
..
.
42
Nm
(31
ft-Ib)

"
Inspect
driveplate
for
cracks
or
elongatedholes
.
Re-



M12
................
.
....
..
.
..
72
Nm
(53ft-Ib)

place
if
necessary
.

"
Check
to
be
sure
torque
converter
is
seated
correctly

in
transmission
during
final
installation
.

"
When
mounting
transmission
to
engine,
the
three

mounting
tabs
on
torque
converter
must
be
aligned

with
indentations
on
driveplate
.
Use
an
alignment

dowel
to
line
up
bolt
holes,
if
necessary
.
"
Fill
transmission
with
clean
ATF
until
oil
leve¡
is
even
with
fill
hole
.
Then
check
fluid
leve¡
as
described
ear-
lier
.

"
Adjust
gearshift
mechanism
.
See
250
Gearshift
link-

age
.

NOTE-

Torx-head
mounting
bolts
shouldalwaysbe
used
with
washers
to
prevent
difficult
removal
.

TRANSMISSION
REMOVAL
AND
INSTALLATION

260-2
DRIVESHAFT

Further
inspection
requires
removal
of
the
driveshaft
.

Check
the
front
centering
guide
on
the
transmission
output
flange
for
damage
or
misalignment
.
Also
check
runoutatthe

transmission
outputflange
and
output
shaft,
and
at
the
final

drive
input
flange
.
Check
the
bolt
hole
bores
in
theflange
for

wear
and
elongation
.

Driveshaftflange
runout
(max
.
allowable)

"
Transmission
outputflange

axial
play
...
.
..
...
..
.
.......
0
.10
mm
(0
.004
in
.)

radial
play
.......
...
.
.
.......
0
.07
mm
(0
.003
in
.)

"
Final
driveinput
flange
radial
play
(measured
at

driveshaft
centering
lip)
..
......
0
.07
mm
(0
.003
in
.)

Spinthe
center
bearing
and
check
for
the
smooth
operation

without
play
.
Check
that
thesplines
of
the
sliding
coupling

move
freely
.
Clean
and
lubricate
the
splines
with
molybdenum

disulfide
grease
(Molykote
®
Longterm
2
or
equivalent)
.

Check
the
universal
joints
for
wear
or
binding
.
If
any
joint
isdif-

ficult
to
move
or
binds,
the
driveshaft
section
should
be
replaced
.

Table
a
.
Driveshaft
Troubleshooting

NOTE-

With
the
driveshaft
installed,
theactual
amount
that
the
universal
joints
pivot
is
limited
.
For
the
most
accurate

test,
check
universal
joints
in
their
normal
range
of

movement
.

If
inspection
revealsnothing
wrong
with
the
driveshaft,
it

may
need
to
be
rebalanced
.
This
can
be
done
by
a
speciality

driveshaft
repair
shop
.
Also,
check
the
alignment
ofthe
drive-

shaft
as
described
below
.

NOTE-

Minor
driveshaftvibrations
can
often
be
correctedsim-

ply
by
disconnecting
the
driveshaftat
the
finaldrive,

and
repositíoning
the
driveshaft
90°,
180°
or270°
inre-
lationto
the
final
drive
input
flange
.

Table
a
lists
symptoms
of
driveshaft
problems
and
their

probable
causes
.
Most
of
the
repair
information
is
contained

within
this
repair
group
.

Symptom



Probable
cause



Corrective
action

1
.
Vibration
when



a
.
Incorrect
preload
of
center
bearing
.



a
.
Check
preload
of
center
bearing
.
Readjust
preload
.
See
Fig
.
6
.

starting
off
(forward



b
.
Center
bearing
rubber
deteriorated
.



b
.
Inspect
center
bearing
and
rubber
.
Replace
if
necessary
.
orreverse)
.



c
.



Flex-disc
damaged
or
worn
.



c
.



Inspect
flex-disc
.
Replace
if
necessary
.

TROUBLESHOOTING

d
.
Engine
or
transmission
mounts
faulty
.
I
d
.
Inspect
engine
and
transmission
mounts
.
Align
or
replace,
if
nec-

essary
.

e
.
Front
centering
guide
worn,
or



e
.
Check
front
centering
guide
and
replace
if
necessary
.
Check

driveshaft
mounting
flanges
out
of



runout
of
driveshaft
flanges
.

round
.

f
.



Universal
joints
worn
or
seized
.



f
.



Check
universal
joint
play
and
movement
.
Replace
driveshaft
if

necessary
.

g
.
Sliding
coupling
seized
.



g
.
Remove
driveshaft
and
check
movement
of
sliding
coupling
.

Clean
coupling
splines
and
replace
parts
asnecessary
.

h
.
Driveshaft
misaligned
.



h
.
Check
driveshaft
alignment
.

2
.
Noise
during
on/off



a
.
Finaldrive
components
worn
or



a
.
Remove
final
drive
and
repair
.

throttle
or
when



damaged
(excessive
pinion-to-ring-

engagíng
clutch
.



gear
clearance)
.

b
.



Drive
axleor
CV
joint
faulty
.



b
.



Inspect
drive
axles
and
CV
joints
.
Repair
or
replace
as
neces-
sary
.

c
.
Sliding
coupling
seized
.



c
.
Remove
driveshaft
and
check
movement
of
sliding
coupling
.

Clean
coupling
splines
and
replace
parts
as
necessary
.

3
.
Vibration
at
25
to
30



a
.
Front
centering
guideworn,
or



a
.
Check
front
centering
guide
and
replace
if
necessary
.
Check
mph
(40
to
50



driveshaft
mounting
flanges
out
of



runout
of
driveshaft
mounting
flanges
.
km/h
).



round
or
damaged
.

b
.
Universal
joints
worn
or
seized
.



b
.
Check
universal
joint
play
and
movement
.
Replace
driveshaft
if
necessary
.

c
.



Flex-disc
damaged
or
worn
.



c
.



Inspect
flex-disc
.
Replace
if
necessary
.

d
.
Center
bearing
rubber
deteriorated
.



d
.
Inspect
center
bearing
.
Replace
if
necessary
.

e
.
Sliding
coupling
seized
.



e
.
Remove
driveshaft
and
check
movement
of
sliding
coupling
.
Clean
coupling
splines
and
replace
parts
asnecessary
.

f
.



Misaligned
installed
position
.



f
.



Check
driveshaft
alignment
.

Symptom



1



Probable
cause

4
.
Vibration,
audible



a
.
Front
centering
guide
worn,
or



a
.
Check
front
centering
guide
and
replace
if
necessary
.
Check
rumble
over35
mph



driveshaft
mounting
flanges
out
of



runout
of
driveshaft
mounting
flanges
.
(60
km/h)
.



round
or
damaged
.

b
.
Mounting
flange
bolts
loose
or
holes



b
.
Remove
driveshaft
and
check
transmissionoutput
flange
and
worn
.



final
drive
input
flange
.
Replace
if
necessary
.
c
.
Driveshaft
unbalanced
.



c
.
Check
driveshaft
for
loose
or
missing
balance
weights
.
Have
driveshaft
rebalanced
or
replace
if
necessary
.

DRIVESHAFT
SERVICE

Driveshaft,
aligning

d
.
Universal
joints
worn
or
seized
.



d
.
Check
universal
joint
play
and
movement
.
Replace
driveshaft
if
necessary
.

e
.
Sliding
coupling
seized
.



e
.
Remove
driveshaft
and
check
movement
of
sliding
coupling
.
1



Clean
coupling
splines
or
replace
parts
asnecessary
.

f
.



Incorrect
preload
of
center
bearing
.



f
.



Check
preload
of
center
bearing
.
Readjust
if
necessary
.
g
.
Center
bearing
faulty
.



g
.



Replace
center
bearing
.

h
.
Final
drive
rubber
mount
faulty



h
.
Inspect
final
drive
rubber
mount
and
replace
if
necessary
.i.



Driveshaft
misaligned
.



i.



Check
driveshaft
alignment
.

Repair
kits
for
the
universal
joints
are
not
available,
and
it
is
not
common
practice
to
repair
the
universal
joints
on
BMW
driveshafts
.
Worn
or
damaged
universal
joints
usually
require
replacement
of
that
section
of
the
driveshaft
.

The
driveshaft
is
balanced
to
cose
tolerances
.
Whenever
it
is
to
be
removed
or
disassembied,
the
mounting
flanges
and
driveshaft
sections
should
bemarked
with
paint
or
a
punch

before
proceeding
with
work
.
This
will
ensure
that
the
drive-
shaft
can
be
reassembled
or
installed
in
exactlythe
same
ori-
entation
.

Universal
joint
play

"
Maximum
allowable
...........
0.15
mm
(0.006
in
.)

The
alignment
of
the
driveshaft
does
not
normally
need
to
be
checked
unless
the
engine/transmission
orthe
final
drive
havebeen
removed
and
installed
.
If,
however,
all
other
parts
of
the
driveshaft
havebeen
inspected
and
found
to
be
okay,
butthere
is
still
noise
or
vibration,
driveshaft
alignment
should

be
checked
.

There
aretwo
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
ofthe
engine/transmission
in
its
mounts
.
Make
a
basic
check
by
sighting
along
the
drive-

shaft
from
back
lo
front
.
Any
misalignmentshould
be
apparent
from
the
center
bearingforward
.
To
adjustthe
side-to-side
alignment,
loosen
the
transmission
or
engine
mounts
to
repo-

sition
them,
then
retighten
the
mounts
:
The
driveshaft
should

be
exactly
centered
in
the
driveshaft
tunnel
.
See
Fig
.
2
.

Table
a
.
Driveshaft
Troubleshooting
(continued)

DRIVESHAFT
260-3

Corrective
action

b
:izó
Fig
.
2
.



Driveshaft
side-to-side
alignment
.
Driveshaft
should
be
cen-
tered
in
driveshaft
tunnel
.

The
second
important
driveshaft
alignment
check
is
more
complicated
.
It
checks
the
amount
the
driveshaft
is
angled
vertically
at
the
joints
.
This
angle
is
known
as
driveshaft
de-
flection
.

In
general,
there
should
be
little
deflection
in
the
driveshaft
between
the
engine,
thecenter
bearing,
and
the
final
drive
.
Precise
checks
require
theuse
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
drive-

shaft
sections
.

To
change
the
deflection
angle,
shims
can
be
placed
between
the
center
bearing
and
the
body
or
between
the
transmission

and
íts
rear
support
.
When
using
shims
to
change
a
deflection

angle,
keep
in
mind
that
the
angle
of
adjacent
joints
will
also
change
.
Deflection
anglesshould
beas
small
as
possible
.

DRIVESHAFTSERVICE