1993 BMW M3 Battery

General
Data
and



010
FundamentalsfortheDo-lt-YourselfOwner

Maintenance



020
Maintenance
Program

Engine

Transmission

Suspension,

Steering
and

Brakes

4
Body

100
Engine-General

110



Engine
Removal
and
Installation
113



Cylinder
Head
Removal
and
Installation
116



Cylinder
Head
and
Valvetrain
117



Camshaft
Timing
Chain

119



Lubrication
System

200
Transmission-General
210
Clutch
230
Manual
Transmission

510



Exterior
Trim,
Bumpers



520



Seats

Bo
y
Equipment



512
DoorWTdws



540



nr
t

513



InteriorTrim



541



Convertible
Top

515



Central
Locking
and
Anti-Theft

600



Electrical
System-General



620



Instruments

Electrical
S



stem
610
Electrical
Component
Locations



630
Exterior
Lighting

611



Wipers
and
Washers



640



Heating
and
Air
Conditioning

6



612



Switches
and
Electrical
Accessories



650



Radio

Equipment
and



720
SeatBelts

Accessories



721
Airbag
System
(SRS)

Electrical
Wiring

Diagrams

Foreword
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v

Warnings
and
Cautions
.....
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.vii

Index
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.
.
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.
.
.
.
........
.
.
.
..
back
of
book

300



Suspension,
Steering
and



330



RearSuspension

Brakes-General



331



Final
Drive

310



Front
Suspension



340



Brakes

320



Steering
and
Wheel
Alignment

400
Body-General



411
Doors

410



Fenders,
Engine
Hood



412



Trunk
Lid

120



Ignition
System
121



Battery,Starter,
Alternator
130



Fue¡
Injection
160



Fuel
Tank
and
Fuel
Pump
170



Radiator
and
Cooling
System180



Exhaust
System

240



Automatic
Transmission
250



Gearshift
Linkage

260
Driveshaft

Please
read
these
warnings
and
cautions

before
proceeding
with
maintenance
and
repair
work
.

WARNING-



"
Friction
materials
(such
as
brake
pads
or
shorts
or
clutchdiscs)
contain
asbestos
fibers
or
other
friction
materials
.
Do
notcreate
"
See
also
Cautionson
page
viü



dustby
grinding,
sanding,
orby
cleaning
with
compressed
air
.

"
Some
repairs
may
be
beyond
your
capability
.
If
you
lack
the



Avoid
breathing
dust
.
Breathing
any
friction
material
dust
can
lead

skills,
tools
and
equipment,
or
a
suitable
workplace
for
any
proce-



to
serious
diseases
and
may
result
in
death
.

duredescribed
in
this
manual,
we
suggestyou
leave
such
repairs



"
Batteries
give
off
explosive
hydrogen
gas
during
charging
.
to
an
authorized
BMW
dealer
service
department
or
other
quali-



Keep
sparks,
lighted
matches
and
open
flame
away
from
the
top
fied
shop
.



of
the
battery
If
hydrogen
gas
escaping
from
the
cap
vents
is

"Do
not
re-use
any
fasteners
that
are
worn
or
deformed
in
normal



ignited,
it
will
ignite
gas
trapped
in
the
cells
and
cause
the
battery

use
.
Many
fasteners
are
designed
to
be
used
only
once
and



to
explode
.

become
unreliable
and
may
fail
when
used
a
second
time
.
This



"
Connect
and
disconnect
battery
cables,
jumper
cablesora
bat-
includes,
but
is
not
limited
to,
nuts,
bolts,
washers,
self-locking
nuts
or
bolts,
circlips
and
cotterpins
.
Always
replace
these
fasteners

with
new
parts
.
"Do
not
quick-charge
the
battery
(for
boost
starting)
for
longer
"
Never
work
under
a
lifted
car
unless
it
is
solidly
supportedon



than
one
minute
.
Wait
at
least
one
minute
before
boosting
the
bat-
stands
designed
for
the
purpose
.
Do
not
support
a
car
on
cinder



tery
a
second
time
.
blocks,
hollow
tiles
or
other
props
that
may
crumble
under
contin-

uous
load
.
Never
work
under
acar
that
is
supported
solely
by
a



"Do
not
allow
battery
charging
voltage
to
exceed
16
.5
volts
.
If
the

jack
.
Never
work
under
thecar
while
the
engine
is
running
.



battery
beginsproducing
gas
or
boiling
violently,
reduce
the
charg-
ing
rate
.
Boosting
a
sulfated
battery
at
a
high
charging
rate
can
"
If
you
are
going
to
work
under
acar
on
the
ground,
make
sure



cause
an
explosion
.
that
the
ground
is
level
.
Block
the
wheels
to
keep
the
carfrom
roll-

ing
.
Disconnect
the
battery
negative
(-)
terminal
(ground
strap)to



"
The
air-conditioning
system
is
filled
with
chemical
refrigerant,

prevent
others
from
starting
thecar
while
youare
under
it
.



which
is
hazardous
.
TheA/C
system
should
be
servicedonly
by

trained
technicians
using
approved
refrigerant
recovery/recycling
"
Never
run
the
engine
unless
the
work
area
is
well
ventilated
.



equipment,
trained
in
related
safetyprecautions,
and
familiar
with
Carbon
monoxide
kills
.



regulations
governing
the
discharging
and
disposal
of
automotive

"
Finger
rings,
bracelets
and
other
jewelry
shouldbe
removed
so



chemical
refrigerants
.

tery
charger
only
with
the
ignition
switched
off,
to
prevent
sparks
.

Do
not
disconnect
the
battery
while
the
engine
is
running
.

that
theycannot
cause
electrical
shorts,
get
caught
in
running



"
Do
not
expose
any
partof
the
A/Csystem
to
high
temperatures
machinery,
or
be
crushed
by
heavy
parts
.



suchas
open
flame
.
Excessiveheat
will
increase
system
pressure

"
Tie
long
hair
behind
your
head
.
Do
not
wear
a
necktie,
a
scarf,



and
may
cause
the
system
to
burst
.

loose
clothing,
or
a
necklace
when
you
work
near
machine
tools
or



"
Some
aerosol
tire
inflators
are
highly
flammable
.
Be
extremely
running
engines
.
If
your
hair,
clothing,
or
jewelry
were
to
get
caught



cautious
when
repairing
a
tire
that
may
havebeen
inflated
using
in
the
machinery,
severe
injury
could
result
.



an
aerosol
tire
inflator
.
Keep
sparks,
open
flame
or
other
sources

"
Do
not
attempt
to
work
onyourcar
if
you
do
not
feel
well
.
You



of
ignition
away
from
the
tire
repair
area
.
Inflate
and
deflate
the
tire

increase
the
danger
of
injury
toyourself
and
others
if
you
are
tired,



at
least
four
times
before
breaking
the
bead
from
therim
.
Com-

upset
or
have
takenmedication
or
any
other
substance
that
may



Pletely
remove
the
tire
from
the
rim
beforeattempting
any
repair
.

keep
you
from
being
fully
alert
.

"
Illuminate
your
work
areaadequately
but
safety
.
Use
a
portable

safety
light
for
working
inside
or
under
thecar
.
Make
surethe
bulb

is
enclosedbya
wire
cage
.
The
hot
filament
of
an
accidentally
bro-

ken
bulb
can
ignite
spilled
fuel
or
oil
.

"
Catch
draining
fuel,
oil,
orbrake
fluid
in
suitable
containers
.
Do

not
use
food
or
beverage
containers
that
mightmislead
someone

into
drínking
from
them
.
Store
flammable
fluids
away
from
fire
haz-

ards
.
Wipe
up
spills
at
once,
but
do
not
store
the
oily
rags,
which

can
ignite
and
burn
spontaneously
.

"
Always
observe
good
workshop
practices
.
Wear
goggles
when

youoperate
machine
tools
or
work
with
battery
acid
.
Gloves
or

other
protectioeclothing
should
be
worn
whenever
thejob
requires

working
with
harmful
substances
.

"
Greases,
lubricants
and
other
automotive
chemicals
contain

toxic
substances,
many
of
which
are
absorbed
directly
through
the

skin
.
Read
the
manufacturer's
instructions
and
warnings
carefully
.

Use
hand
andeye
protection
.
Avoid
direct
skin
contact

"
Cars
covered
by
this
manual
are
equipped
with
a
supplemental

restraint
system
(SRS),
that
automatically
deploys
an
airbag(s)
in

theevent
of
a
frontal
ímpact
.
The
airbag(s)
is
inflated
byan
explo-

sive
device
.
Handled
improperly
or
without
adequate
safeguards,

can
be
accidently
activated
and
cause
serious
injury
.

"
The
ignition
system
produces
high
voltages
that
can
be
fatal
.

Avoid
contact
with
exposed
terminals
and
use
extreme
care
when

working
ona
car
with
the
engine
running
or
the
ígnition
switched
on
.

"
Place
jack
stands
only
at
locations
specified
bymanufacturer
.

The
vehicle
lifting
jacksupplied
with
the
vehicle
is
intended
for
tire

changes
only
.
A
heavy
duty
floor
jack
shouldbe
used
to
lift
vehicle

before
installing
jack
stands
.
See
010
Fundamentals
for
theDo-
.

it-Yourself
Owner
.

"
Battery
acid
(electrolyte)
can
cause
severeburns
.
Flush
contact

area
with
water,
seek
medical
attention
.

"
Aerosolcleaners
and
solvents
may
contain
hazardous
ordeadly
vapors
and
are
highly
flammable
.
Use
only
in
a
wellventilated

area
.
Do
not
use
on
hot
surfaces
(engines,
brakes,
etc
.)
.

"
Disconnect
the
battery
negative
(-)
terminal
(Ground
strap)



"
Do
not
remove
coolant
reservoir
or
radiator
cap
with
theengine

whenever
you
work
on
the
fuel
system
orthe
electrical
system
.
Do



hot
.
Danger
of
bums
and
engine
damage
.

not
smoke
or
work
near
heaters
or
other
fire
hazards
.
Keep
an

approved
fire
extinguisher
handy
.



continued
on
next
page
vii

Please
read
these
warnings
and
cautions

before
proceeding
with
maintenance
and
repair
work
.

CAUTION-

"
See
also
Warnings
onpage
vi¡



"
Beforedoing
any
electrical
welding
on
cars
equipped
with
ABS,
disconnect
the
battery
negative
(-)
terminal
(ground
strap)
and
the
"
If
you
lack
the
skills,
tools
and
equipment,
ora
suitable
work-



ABS
control
unit
connector
.
shop
for
any
procedure
described
in
this
manual,
we
suggest
you
leave
such
repairs
to
an
authorized
BMW
dealer
or
other
qualified



"
On
cars
equipped
with
anti-theft
radios,
make
sureyou
know
the
shop
.



correct
radio
activation
code
before
disconnecting
the
battery
or
removing
the
radio
.
lf
the
wrong
code
is
entered
into
the
radio
"
BMW
is
constantly
improving
its
cars
and
sometimes
these



when
power
is
restored,
that
radio
may
lock
up
and
be
renderedchanges,
both
in
parts
and
specifications,
are
made
applicable
to



inoperable,
even
if
the
correct
code
is
thenentered
.
earlier
models
.
Therefore,
part
numbers
listed
in
this
manual
are
for
reference
only
.
Always
check
with
your
authorized
BMW
dealer



"
Always
make
sure
ignition
is
off
before
disconnecting
battery
.
parts
department
for
the
latest
information
.
"
Label
battery
cablesbefore
disconnecting
.
Onsome
models,
"
Before
starting
a
job,
make
certain
that
you
have
all
the
neces-



battery
cablesarenot
color
coded
.
sary
tools
and
parts
on
hand
.
Read
al¡
the
instructions
thoroughly,
do
not
attempt
shortcuts
.
Use
tools
appropriate
to
the
work
and



"
Disconnecting
the
battery
may
erase
fault
code(s)
stored
in
con-

use
only
replacement
parts
meeting
BMW
specifications
.
Make-



trol
module
memory
Using
special
BMW
diagnostíc
equipment,
shift
tools,
parts
and
procedures
will
not
make
good
repairs
.



check
forfault
codes
prior
to
disconnecting
the
battery
cables
.If
the
Check
Engine
light
is
illuminated,
see100
Engine-General
for
"
Use
pneumatic
and
electric
tools
only
to
loosenthreaded
parts



On-Board
Diagnostics
(OBD)
fault
code
information
.
lf
any
other
and
fasteners
.
Never
use
these
tools
to
tighten
fasteners,
espe-



system
faults
have
been
detected
(indicated
by
an
ílluminated
cially
on
light
alloy
parts
.
Always
use
a
torque
wrench
to
tighten



warning
light),
see
an
authorized
BMW
dealer
.
fasteners
to
the
tightening
torque
specification
listed
.
"
If
a
normal
or
rapid
charger
is
used
to
charge
battery,
the
battery
"Be
mindful
of
the
environment
and
ecology
.
Before
you
drain
the



mustbe
disconnected
and
removed
fromthe
vehicle
in
order
to
crankcase,
find
outthe
proper
way
to
dispose
of
the
oil
.
Do
not



avoid
damaging
paint
and
upholstery
pour
oil
onto
the
ground,
down
a
drain,
or
into
a
stream,
pond
orlake
.
Dispose
of
in
accordance
withFederal,
State
and
Local
laws
.



"Do
not
quick-chargethe
battery
(for
boost
starting)
for
longer
than
one
minute
.
Wait
at
least
one
minute
before
boosting
the
bat-
e
If
battery
power
is
lost
or
the
battery
has
been
disconnected,
the



tery
a
second
time
.
powerwindows
must
be
re-initialized
.
Both
one
touch
up/down
and
pinch-protection
will
be
inactive
until
windows
are
re-initial-



"
Connect
and
disconnect
a
battery
charger
only
with
the
battery
ized
.
See
512
Door
Windows
.



charger
switched
off
.

"
The
control
module
for
the
anti-lock
brake
system
(ABS)
cannot
withstand
temperatures
from
a
paint-drying
booth
or
aheat
lamp
in
excess
of
203°F
(95°C)
and
should
not
be
subjected
to
temper-
atures
in
excess
of
185°F
(85°C)
for
more
than
twohours
.

"
Sealed
or
"maintenance
free"
batteries
shouldbeslow-charged
only,
at
anamperage
ratethat
is
approximately
10%
of
the
bat-
tery's
ampere-hour
(Ah)
rating
.

"
Do
not
allow
battery
chargingvoltage
to
exceed
16
.5
volts
.
If
the
battery
begins
producing
gas
or
boiling
violently,
reduce
the
charg-
ing
rate
.
Boosting
a
sulfated
battery
at
a
high
charging
rate
can
cause
an
explosion
.

010-2



FUNDAMENTALS
FOR
THE
DO-ITYOURSELF
OWNER

HOW
TO
USE
THIS
MANUAL

A
note
contains
helpfulinformation,
tipsthat
will
hefp
in
The
manual
is
divided
into
ninesections
:



doinga
better
job
and
completing
!t
more
easíly
.

0
GENERAL
DATA
AND
MAINTENANCE

1
ENGINE

2
TRANSMISSION

3
SUSPENSION,
STEERING
AND
BRAKES

4
BODY

5
BODY
EQUIPMENT

6
ELECTRICAL
SYSTEM

7
EQUIPMENTANDACCESSORIES

ELECTRICAL
WIRING
DIAGRAMS

0
GENERAL
DATA
AND
MAINTENANCE
coversthe
rec-

ommended
maintenance
schedules
and
service
procedures

needed
to
perform
BMW
scheduled
maintenance
work
.
Also

within
this
section
is
the
010
Fundamentals
for
the
Do-It-

Yourself
Owner
section,
which
contains
basic
instructions,
tips
and
helpful
hints
for
do-it-yourself
maintenance
and
repair
.

The
next
seven
sections
(1
through
7)
are
repair
based
and

are
further
broken
down
into
three
digit
repair
groups
.
Each
ma-

jor
section
begins
with
a
General
repair
group,
e
.g
.
100En-

gine-General
.
These
"00"
(doublezero)
groups
aremostly

descriptive
in
nature,
covering
topics
suchas
theory
of
opera-
tion
and
troubleshooting
.
The
remainder
of
the
repair
groups

contain
the
more
involved
repair
information
.
The
last
major

section
contains
detailed
electrical
wiring
diagram
schematics
.

A
master
listing
of
the
9major
sections
and
the
correspond-
ing
individual
repair
groups
can
befoundon
the
inside
front
cover
.

Each
repair
group
begins
with
a
Table
of
Contents
listing
the

majos
subject
headings
within
the
group
.
Page
numbers

throughout
the
manual
are
organizedaccording
to
the
repair
groupsystem
.
For
example,
youcan
expect
tofind
repair
infor-
mation
on
brakes
(Repair
Group
340)
beginning
on
page
340-
1
.
A
comprehensive
index
can
be
found
at
the
back
of
the
man-

ual
.

Warnings,
Cautions
and
Notes
Throughout
this
manualare
many
passages
with
the
head-
ings
WARNING,
CAUTION,
or
NOTE
.
These
very
important
headings
have
diflerent
meanings
.

WARNING
-

The
text
under
this
heading
warns
of
unsafe
practic-
es
thatare
very
likelyto
cause
ínjury,
eitherby
dírect
threat
to
the
person(s)
pertorming
the
work
or
by
in-
creased
risk
of
accident
or
mechanfcal
fallure
whíle
driving
.

CAUTION-

A
caution
calls
attention
to
important
precautions
to
beobserved
during
the
repair
work
that
will
helo
prevent
accidentally
damaging
the
caror
its
parts
.

GETTING
STARTED

Safety

NOTE-

Please
read
every
WARNING,
CAUTION,
and
NOTE
at
the

front
of
the
manual
and
as
they
appear
in
repair
procedures
.

They
are
very
important
.
Read
them
before
you
begin
any

maintenance
or
repair
job
.

Some
WARNINGs
and
CAUTIONs
are
repeated
wherever

they
apply
.
Read
them
all
.
Do
not
skip
any
.
These
messages
are
important,
even
to
the
owner
who
never
intends
to
workon

thecar
.

GETTING
STARTED

Most
of
the
necessary
maintenance
and
minor
repair
that
an

automobile
will
need
canbe
done
with
ordinary
tools,
evenby

owners
with
little
or
no
experience
in
car
repair
.
Below
is
some

important
information
on
how
to
work
safely,
a
discussion
of

what
tools
will
be
needed
and
how
to
use
them
.

Although
an
automobile
presents
many
hazards,
common

sense
and
good
equipment
can
helo
ensure
safety
.
Many
acci-

dents
happen
because
of
carelessness
.
Pay
attention
and
stick
to
these
few
important
safety
rules
.

WARNING
-

"
Never
run
the
engine
in
the
work
area
unless
it
is
well-ventflated
.
Theexhaustshouldbe
vented
to
the
outside
.
Carbon
monoxide
(CO)
in
theex-
haust
kilts
.

"
Remove
all
neckties,
scarts,
loose
clothing,
or
jewelry
when
working
near
running
engines
or
power
tools
.
Tuck
in
shirts
.
Tie
long
haír
and
se-
cure
it
under
a
cap
.
Severe
injury
can
result
from
these
things
beíngcaught
in
rotating
parts
.

"
Remove
ríngs,
watches,
and
bracelets
.
Asíde
from
the
dangersof
moving
parts,
metallic
jew-
elry
conducts
electricity
and
may
cause
shorts,
sparks,
bums,
or
damage
to
the
electrical
sys-
tem
when
accidentally
contacting
the
battery
or
other
electrical
terminals
.

"
Disconnect
the
battery
negative
()
cable
when-
ever
working
on
ornear
the
fuel
system
or
any-
thlng
that
is
electrically
powered
.
Accidental
electrícal
contact
may
damage
the
electrical
system
or
cause
a
fire
.

WARNING
-

"
Never
work
under
a
lifted
car
unless
it
is
solidly
supported
on
jack
stands
that
are
intended
for
that
purpose
.
Do
not
support
a
car
on
cinder
blocks,
bricks,
or
other
objects
that
may
shift
orcrumble
under
continuous
load
.
Never
work
un-
dera
car
that
is
supported
only
by
the
lifting
jack
.

"
Fuel
is
highly
flammable
.
When
working
around
fuel,
do
not
smoke
or
worknear
heaters
or
other
fire
hazards
.
Keepan
approved
fire
extinguisher
handy
.

"
llluminate
the
work
area
adequately
and
safely
.
Use
a
portable
safety
light
for
working
inside
or
under
thecar
.
A
fluorescent
type
lightis
best
be-
cause
it
gives
off
less
heat
.
If
using
a
light
with
anormal
incandescent
butb,
use
rough
service
bulbs
to
avoid
breakage
.
The
hot
filamentof
an
accidentallybroken
bulb
can
ignite
spilled
fuel
or
oil
"
Keep
sparks,
lighted
matches,
and
any
open
llame
away
from
thetop
of
the
battery
.
Hydrogen
gas
emitted
by
the
battery
is
highly
flammable
.
Any
nearby
source
of
ignition
may
cause
the
battery
to
explode
.

"
Never
¡ay
tools
or
parts
in
the
engine
compart-
ment
or
on
top
of
the
battery
.
They
may
fall
into
confined
spaces
and
be
difficult
toretrieve,
be-
come
caught
in
beits
or
other
rotating
parts
when
the
engine
is
started,
or
cause
electrical
shorts
anddamage
to
the
electrical
system
.

"
The
fuel
system
is
designed
to
retain
pressure
even
when
the
ignition
is
off
.
When
working
with
the
fuel
system,
loosen
the
fuel
fines
slowly
to
al-

low
the
residual
pressure
to
dissipate
gradually
.

Take
precautions
to
avoid
spraying
fuel
.

Lifting
the
Car

FUNDAMENTALS
FOR
THE
DO-ITYOURSELF
OWNER
010-
3

For
those
repairs
that
require
raising
the
car,
theproper
jack-

ing
points
should
beused
to
raise
thecar
safely
and
avoid
dam-

age
.
There
are
four
jacking
points
from
which
thecar
can
be

safely
raised
.
The
jacksupplied
with
thecar
by
BMW
can
only

be
used
at
the
fourside
points
just
behindthe
front
wheel
or

just
in
frontof
the
rear
wheel
.
See
Fig
.
1.

WARNING
-

"
When
raising
the
car
using
a
floor
jack
ora
hy-

draulic
lift,
carefully
position
the
jack
pad
topre-

vent
damaging
the
car
body
.
A
suitable
liner

(wood,
rubber,
etc
.)
should
be
placed
between
the
jack
and
the
car
to
prevent
body
damage
.

"
Watch
the
jack
closely
.
Make
sure
ft
stays
stable

and
does
not
shift
or
tilt
.
As
the
car
is
raised,
the
car
may
rol¡
slightly
and
the
jack
may
shift
.

Fig
.
1
.



3-Seriesjacking
points
(arrows)
.

Raising
car
safely

1
.
Park
car
on
flat,
leve¡
su
rface
.

2
.
Remove
the
round
cover
from
jack
mount
using
a

screwdriver
.
See
Fig
.
2
.

0013126

Fig
.
2
.



Jack
mount
cover
being
removed
from
rocker
panel
.

3
.
Place
jack
fully
into
position
.
See
Fig
.
3
.
Make
sure
jack

is
resting
on
flat,
solid
ground
.
Use
a
board
or
other
sup-

port
to
provide
a
firm
surface
for
the
jack,
if
necessary
.

4
.
Raisecar
slowly
while
constantly
checking
position
of

jack
and
car
.

5
.
Once
car
is
raised,
block
the
wheel
that
is
opposite
and

farthest
from
jackto
prevent
car
fromunexpectedly
roll-

ing
.

GET77NG
STARTER

010-
4



FUNDAMENTALS
FOR
THE
DO-ITYOURSELF
OWNER

Fig
.
3
.



BMW
supplied
jack
correctly
positioned
in
front
jacking
point
.



Most
of
the
repairs
and
maintenance
tasks
described
in
this

manual
can
be
successfully
completedby
anyone
with
basic

tools
and
abilities
.
To
prevent
getting
in
too
deep,
know
what

WARNING-



the
wholejob
requires
before
starting
.
Read
the
procedure
thor-

"
Do
not
rely
on
thetransmission
or
the
emergen-



oughly,
from
beginning
to
end,
in
order
to
know
just
what
to
ex
cybrake
to
keep
thecar
from
rolling
.
They
are



pect
and
what
parts
will
have
to
be
replaced
.

nota
substitute
for
positively
blocking
the
oppo-
site
wheel
.

"
Never
work
undera
car
that
is
supported
only
by
ajack
Use
jack
stands
that
are
properly
de-
signed
to
support
the
car
.
See
Tools
.

Working
under
car
safely

1
.
Disconnect
negative
(-)
cable
from
battery
so
that
no

one
else
can
start
thecar
.
Let
others
know
what
you
will

be
doing
.

CAUTION-

Prior
to
disconnecting
the
battery
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
page
vüi
.

2
.
Raisecar
slowly
as
described
above
.

3
.
Use
at
least
two
jack
stands
to
support
thecar
.
A
jack
is
atemporary
lifting
device
and
should
not
be
used
alone
to
support
the
car
while
you
are
under
it
.
Use
jack
stands
designed
for
the
purpose
of
supporting
a
car
.
For
more
information
on
jack
stands,
see
Toolsbelow
.

WARNING
-

Do
notusewood,
concrete
blocks,
orbricks
to
sup-
port
acar
.
Woodmay
split
.
Blocks
or
bricks,
while
strong,
are
not
designed
for
that
kind
of
load,
and
may
brakkor
collapse
.

ADVICE
FOR
THE
BEGINNER

4
.
Place
jack
stands
on
firm,
solid
surface
.
If
necessary,

use
a
flat
board
or
similar
solid
object
to
provide
a
firm

footing
.

5
.
Lower
car
slowly
until
its
weight
is
fully
supportedby

jack
stands
.
Watch
to
make
sure
that
the
jack
stands
do

not
tip
orlean
as
thecar
settles
on
them
.

6
.
Observe
all
jacking
precautions
again
when
raising
car

to
remove
jack
stands
.

ADVICE
FORTHE
BEGINNER

The
tips
in
the
paragraphs
that
follow
are
general
advice
to

help
any
do-it-yourself
BMW
owner
perform
repairs
and
main-

tenance
tasks
more
easily
and
more
professionally
.

Planning
Ahead

Cleanliness

Keeping
things
organized,
neat,
and
clean
is
essential
to
do-

ing
a
good
job
.
When
working
under
the
hood,
fender
covers

will
protect
the
finish
from
scratches
and
other
damage
.
Make
sure
the
car
is
relatively
clean
so
thatdi
rt
under
the
cover
does

not
scratch
the
finish
.

Any
repair
job
will
be
less
troublesome
if
the
parts
are
clean
.

For
cleaning
old
parts,
there
are
many
solvents
and
parts

cleaners
commercially
available
.

For
cleaning
parts
priorto
assembly,
commercially
available
aerosol
cans
of
parts
cleaner
or
brake
cleaner
are
handy
to
use,
and
the
cleaner
will
evaporate
completely
.

WARNING
-

Virtually
all
solvents
used
for
cleaning
parts
are
highly
flammable,
especially
in
aerosol
form
.
Use
wíth
extreme
care
.
Do
not
smoke
.
Do
not
use
these
products
near
any
source
of
heat,
sparksor
flame
.

Let
any
solvent
orcleaning
product
dry
completely
.
Low-
pressure,
dry
compressed
air
is
helpful
if
available
.
Also,
use
only
lint-free
rags
for
cleaning
and
drying
.

FUNDAMENTALS
FOR
THEDO-ITYOURSELF
OWNER



010-
5

WARNING
-

Avoid
getting
tools
or
clothing
near
the
battery
.
Bat-tery
electrolyte
is
a
corrosive
acid
.
Be
careful
with

brake
fluid,
as
it
can
damage
the
cars
paint
Finally,
keep
rubber
parts
such
as
hoses
and
bolts
free
from
oil
orgasoline,
as
they
will
cause
the
material
to
soften
and
fail
prematurely
.

Non-reusable
Fasteners

Many
fasteners
usedon
the
cars
coveredby
this
manual

mustbe
replaced
with
new
osesonce
they
are
removed
.
These



Fig
.
4
.
General
sequence
for
alternately
tightening
multiple
fasten-

include
butarenot
limited
to
:
bolts,
nuts
(self-locking,
nylock,



ers
.

etc
.),
cotterpins,
studs,
brake
fittings,
rol¡
pins,clips
and
wash-

ers
.
Genuine
BMW
parts
should
be
the
only
replacement
parts



NOTE-

used
for
this
purpose
.



"
Metric
bolt
classes
or
grades
are
markedon
the
bolt'

head
.

Some
bolts
are
designed
to
stretch
during
assembly
and
are

permanently
altered
rendering
them
unreliable
once
removed
.

These
are
known
as
torque-to-yield
fasteners
.
Always
replace
fasteners
where
instructed
to
doso
.
Failure
to
replace
these

fasteners
could
cause
vehicle
damage
and
personal
injury
.

See
an
authorized
BMW
dealer
for
applications
and
ordering

information
.

Tightening
Fasteners

When
tighteningthe
bolts
ornuts
that
attach
acomponent,
it

is
always
good
practice
to
tighten
the
bolts
gradually
and
evenly

to
avoid
misalignment
or
over
stressing
anyone
portion
of
the

component
.
For
components
sealed
with
gaskets,
this
method

helps
to
ensure
that
thegasket
will
seal
properly
and
complete-

ly
.

Where
there
are
severa¡
fasteners,
tighten
them
in
a
se-

quence
alternating
between
opposite
sides
of
the
component
.

Fig
.
4
shows
such
a
sequence
for
tightening
six
bolts
attaching

a
typical
component
.
Repeat
the
sequence
until
al¡
the
bolts
are
evenly
tightened
to
theproper
specification
.

"
Do
not
confuse
wrench
sizewithbolt
diameter
size
.
Fora
listing
of
the
common
wrenches
used
on
vari-
ous
bolt
diameters,
see
Basic
Tool
Requirements
.

Table
a
.
General
Bolt
Tightening
Torques
in
Nm

(max
.
permissible)

Bolt
Class
(according
to
DIN
267)
Bolt
diameter
5
.6
5
.8
6
.8
8
.8
10
.9
12
.9

M5
2
.5
3
.5
4
.5
6810

M6



4
.5



6



7
.5



10



14
`
17

M8



11



15
-



18



24



34



40

M10
233036476679

M12
3952
62
82115140

M14
6282
98
130
180220

M16
9426150
200280340

M18
130174210280
390
470

For
some
repairs
a
specific
tightening
sequence
is
neces-

sary,
or
a
particular
order
of
assembly
is
required
.
Such
special



Gaskets
and
Seals

conditions
are
noted
in
the
text,
and
the
necessary
sequence
is

described
or
illustrated
.
Where
no
specific
torque
is
listed,
Ta-



The
smoothest
metal
mating
surfaces
still
have
imperfec

blea
can
be
used
as
a
general
guide
for
tightening
fasteners
.



tions
that
can
allow
leakage
.
To
prevent
leakage
atcritica¡

joints,
gaskets
of
soft,
form-fitting
material
are
used
to
fill
in
the

WARNING
-



imperfections
.
Table
ais
a
general
reference
only
.
The
values
list-

ed
in
the
table
are
not
intended
to
be
used
asa
sub-



To
be
most
effective,
gaskets
are
designed
to
crush
and
be-
stitutefor
torques
specifically
called
out
in
the
text



come
thinner
as
the
mating
parts
are
bolted
together
.
Once
a
throughout
this
manual
.



gasket
has
been
used,
it
is
no
longer
capable
of
makingas

good
a
sea¡
as
when
new,
and
is
muchmore
likely
toleak
.
For

this
reason,
gaskets
should
not
be
reused
.
Always
plan
to
use

new
gaskets
for
any
reassembly
.
Some
gaskets-such
as
head
gaskets-are
directional
.
Make
sure
that
these
are
in-

stalled
correctly
.
This
same
logic
applies
to
any
part
used
for

sealing,
including
rubber
O-rings
and
copper
sealing
washers
.

ADVICE
FOR
THE
BEGINNER

010-
6



FUNDAMENTALS
FOR
THE
DO-ITYOURSELF
OWNER

In
places
where
a
shaft
mustpass
through
a
housing,
flexible
lip
seals
areused
to
keep
the
lubricating
oil
or
grease
from
leak-

ingout
past
the
rotating
shaft
.
Seals
should
never
be
reused

once
they
have
been
removed
.
When
removing
a
seal,
be
care-
ful
not
lo
scratch
or
otherwise
damage
the
metal
surfaces
.
Even
minor
damage
to
sealing
surfaces
can
cause
sea¡
damage
and
leakage
.

The
key
to
sea¡
installation
is
to
get
the
sea¡
in
straight
without

damaging
¡t
.
Use
a
sea¡
driver
that
is
the
same
diameter
as
the
seal
housing
to
gently
and
evenly
insta¡I
into
place
.
If
a
proper
size
seal
driver
is
not
available,
a
socket
of
the
right
size
will
do
.

When
installing
a
seal,
¡t
a
good
idea
to
coat
the
sea¡
with
o¡I

to
aid
installation
.
Some
seals
are
directional
and
special
instal-
lation
instructions
apply
.
Make
sure
¡t
is
installed
with
the
lip
fac-
ing
the
correct
way
.
Normally
the
lip
faces
the
inside
.
Note
the
installation
direction
of
the
old
sea¡before
removing
¡t
.

Electrical
Testing

Many
electrical
problems
canbe
understood
and
solved
with
only
a
little
fundamental
knowledge
of
how
electrical
circuits



Insulate
the
finished
connection
.
Electronics
stores
can
sup-
function
.



ply
heat-shrinkable
insulating
tubing
that
can
be
placed
onto
the
wire
before
connectiog,
slid
over
the
finished
joint,
and
Electric
current
only
flows
in
a
complete
circuit
.
To
operate,



shrunk
to
a
tight
fit
with
a
heat
gun
orhair
dryer
.
The
nextbest
every
electrical
device
in
thecar
requires
a
complete
circuit
in-



alternative
is
electrical
tape
.
Make
sure
the
wire
is
clean
and
cluding
a
voltage
source
and
a
pathto
ground
.
The
positive
(+)



free
ofsolder
flux
or
other
contamination
.
Wrap
the
joint
tightly
side
of
the
battery
is
the
original
voltagesource,
and
ground
is
to
sea¡
out
moisture
.
See
600
Electrical-General
for
more
in-
any
retum
path
to
the
negative
()
-
side
ofth
e
battery°
whether
li



formation
.
through
the
wiring
harness
or
thecar
body
.
Except
for
portions
of
the
charging
system,
al¡
electrical
current
in
the
car
is
direct
current
(DC)
and
flows
from
positive
(+)
to
negative
(-)
.



BVYING
PART$

Switches
are
used
to
turn
components
on
or
off
by
complet-
ing
or
interrupting
#he
circuit
.
A
switch
is
"open"
when
the
circuit



Many
of
the
maíntenance
and
repair
tasks
in
this
manual
cal¡
is
ínterrupted,
and
"closed"
when
the
circuit
is
completed
.
Fig
.
5



for
the
installation
of
new
parte,
or
the
use
of
new
gaskets
and

shows
a
basic
circuit
schematic
.
See600
Electrical
System-



other
materials
when
reinstalling
parts
.
Most
often,
the
parts

General
for
electrical
troubleshooting
.



that
will
be
needed
should
be
on
hand
beforebeginningthe
job
.
Read
the
introductory
text
and
the
complete
procedure
to
de-
termine
which
parts
will
be
needed
.

B029ELG

Fig
.
5
.



Schematic
representation
of
simple
circuit
for
light
bulb
.
Igni-
tion
switch
is
shown
closed,
making
circuit
complete
.

BVYING
PARTS

Wire
Repairs

Repairs
to
a
wiring
harness
requirespecial
care
to
make
the

repair
permanent
.
The
wire
endsmust
be
clean
.
lf
frayedor
oth-

erwise
damaged,
cut
off
the
end
.
If
the
wire
is
too
short,
splice
in

a
new
piece
of
wire
of
the
same
size
and
make
two
connec-
tions
.

Use
connectors
that
are
designed
for
the
purpose
.
Crimped-

on
or
soldered-onconnectors
are
best
.
Crimp
connectors
and

special
crimping
pliers
are
widely
available
.
If
soldering,
use

needlenose
pliers
tohold
the
wire
near
the
solder
joint
and
cre-
ate
a
"heat
dam"
.
This
keeps
the
heat
and
the
solder
from
trav-
eling
up
the
wire
.
Always
use
a
solder
made
specifically
for
electrical
work
(rosin
core)
.

NOTE-

Twisting
wirestogether
to
make
a
repair
is
not
recom-
mended
.
Corrosion
and
vibration
will
eventually
spoil
the
connection
and
may
lead
to
irreparable
damage
to
sensitive
electronic
componente
.

NOTE-

For
some
bigger
jobs,
partial
disassembly
and
inspec-
tion
are
required
to
determine
acomplete
parts
list
.
Read
the
procedure
carefully
and,
if
necessary,
make
other
arrangements
to
get
the
necessary
parts
while
your
car
is
disassembled
.

Genuine
BMW
Parts

Genuine
BMW
replacement
parts
from
an
authorized
BMW
dealer
are
designed
and
manufactured
lo
the
same
high
stan-
dards
as
the
original
parts
.
They
will
be
the
correct
material,
manufactured
to
the
same
specifications,
and
guaranteed
lo
fit
and
work
as
intended
by
the
engineers
who
designed
thecar
.
Some
genuine
BMW
parts
have
a
limited
warranty
.