1993 BMW 325i gas type

BMW
SERVICE
MANUUAS
BMW
7
Series
Service
Manual
:
1988-1994
7351,735iL,
740i,
740iL,
750iL
Robert
Bentley
ISBN
0-8376-0328-5

BMW
3
Series
Service
Manual
:
1992-1998
M3,
3181,323i,325i,
328i,
Sedan,
Coupe
and
Convertible
Robert
Bentley
ISBN
0-8376-0326-9
Glory
Days
:
When
Horsepowerand
BMW
Z3
Service
Manual
:
1996-1998



Passion
Ruled
Detroit
4-cylinder
and
6-cylinder
models



Jim
Wangers
ISBN
0-8376-0208-4
RobertBentley
ISBN
0-8376-0327-7



Alfa
Romeo
Owner's
BibleTM
BMW
3-Series
Service
Manual
:
1984-1990



Pat
Braden
with
foreword
by
Don
Black
3181,
325,325e(es),
325i(is),
and
325i



ISBN
0-8376-0707-9
Convertible
RobertBentley
ISBN
0-8376-0325-0



Ford
F-Series
Pickup
Owner's
BibleTM
Moses
Ludel
ISBN
0-8376-0152-5
BMW
5-Series
Service
Manual
:
1989-1995
5251,
530i,535i,
540i
including
Touring
Robert
Bentley
ISBN
0-8376-0319-6

BMW
5-Series
Service
Manual
:
1982-1988
528e,
5331,
535i,
535is
RobertBentley
ISBN
0-8376-0318-8

ENTHUSIAST
TITLES
Complete
Roundel
1969-1998
:30
Years
of
the
Magazine
of
the
BMW
Car
Club
of
America
(CD-ROM)
ISBN
0-8376-0322-6

A
French
Kiss
WithDeath
:
Steve
McQueen
and
the
Making
ofLe
Mans
Michael
Keyser
ISBN
0-8376-0234-3

The
Speed
Merchants
:
A
Journey
Through
The
World
of
Motor
Racing,1969-72Michael
Keyser
ISBN
0-8376-0232-7

Mustang
5
.0
Technical
Reference
&
Performance
Handbook
Al
Kirschenbaum
ISBN
0-8376-0210-6

Maximum
Boost
:
Designing,
Testing,
and
Installing
Turbocharger
Systems
Corky
Bell
ISBN
0-8376-0160-6

Volkswagen
Sport
Tuning
for
Street
and
Competition
Per
SchroederISBN
0-8376-0161-4

Sports
Carand
CompetitionDriving
Paul
Frérewithforewordby
PhilHill
ISBN
0-8376-0202-5

Automotive
Books
From
Robert
Bentley

GTI,
Golf,
and
Jetta
Service
Manual
:
1985-
The
Design
and
Tuning
of
Competition



1992
Gasoline,
Diesel,
and
Turbo
Diesel,
EnginesPhilipH
.
Smith,
6th
editionrevised
by



including
16V
Robert
Bentley
David
N
.
Wenner
ISBN
0-8376-0140-1



ISBN
0-8376-0342-0
Going
Faster
:
The
Skip
BarberRacing



Corrado
Official
Factory
Repair
Manual
:
School
Carl
Lopez
ISBN
0-8376-0227-0



1990-1994
Volkswagen
United
States
9M-f,
Ir-
Win
n
on
Alexander
with
foreword



ISBN
0-8376-0387-0

by
Mark
Martín
ISBN
0-8376-0070-7



Passat
Service
Manual
:
1990-1993,

The
Technique
of
Motor
Racing
Piero



including
Wagon
Volkswagen
United
States

Taruf
fi
with
foreword
by
Juan
Manuel
Fangio



ISBN
0-8376-0378-1

ISBN
0-8376-0228-9



Cabriolet
and
SciroccoService
Manual
:
Race
Car
Aerodynamics



1985-1993,
including
16V
Joseph
Katz
ISBN
0-8376-0142-8



RobertBentley
ISBN
0-8376-0362-5

The
Scientific
Design
of
Exhaust
and



VolkswagenFox
Service
Manual
:
1987-
Intake
Systems
Philip
H
.
Smith
and
John
C
.



1993,
including
GL,
GL
Sport
and
Wagon
Morrison
ISBN
0-8376-0309-9



RobertBentley
ISBN
0-8376-0363-3

Volkswagen
Model
Documentation



Rabbit,
Scirocco,
Jetta
Service
Manual
:
Joachim
Kuch
ISBN
0-8376-0078-2



1980-1984
Gasoline
Models,
including

Volkswagen
Beetle
:
Portrait
of
a
Legend



Pickup
Truck,
Convertible,
and
GTI
Robert

Edwin
Baaske
ISBN
0-8376-0162-2
Bentley
ISBN
0-8376-0183-5

Jeep
Owner's
BibleTM
Moses
Ludel
ISBN
0-8376-0154-1

Eurovan
Official
Factory
Repair
Manual
:



MANUUAS

Volkswagen
Inspection/Maintenance
(I/M)
Emission
Test
Handbook
:1980-1997
Volkswagen
of
America
ISBN
0-8376-0394-3

Rabbit,
Jetta
Service
Manual
:
1977-1984Diesel
Models,
including
Pickup
Truck
and
Turbo
Diesel
RobertBentley
ISBN
0-8376-0184-3

Super
Beetle,
Beetle
and
Karmann
Ghia
Official
Service
Manual
Type1
:1970-1979Volkswagen
United
States
ISBN
0-8376-0096-0

Beetle
and
Karmann
Ghia
Official
Service
Manual
Type1
:1966-1969
Volkswagen
United
States
ISBN
0-8376-0416-8
Harley-Davidson
Evolution
V
Twin
Owner's
BibleTM
Moses
Ludel
ISBN
0-8376-0146-0
Audi
100,
A6
Official
Factory
Repair
Manual
:
1992-1997,
including
S4,
S6,
quattro
and
Wagon
models
.
Toyota
Truck
&
Land
Cruiser
Owner's



Audi
of
America
.
ISBN
0-8376-0374-9
BibleTM
Moses
Ludel
ISBN
0-8376-0159-2



Audi
80,
90,
Coupe
Quattro
Official

AUDI
SERVICE
MANUUAS

The
Racing
Driver
Denis
Jenkinson



Factory
Repair
Manual
:
1988-1992
ISBN
0-8376-0201-7



including
80
Quattro,
90
Quattro
and
20-valve
models
Audi
of
America
Unbeatable
BMW
:
Eighty
Years
of



FUEL
INJECTION



ISBN
0-8376-0367-6
Engineering
and
Motorsport
Success



Ford
Fuel
Injection
and
Electronic
Engine



Audi
100,
200
Official
Factory
Repair
JeremyWalton
ISBN
0-8376-0206-8



Charles
O
Probst,
SAE



Manua1
:1988-1991
Audi
of
America
Control
:
1788-1993
.
BMW
6
Series
Enthusiast's
CompanionTM



ISBN
0-8376-0301-3



ISBN
0-8376-0372-2
Jeremy
W
.11

ISBN
0-8376-0149-5
Ford
Fuel
Injection
and
Electronic
Engine



Audi
50005
5000CS
Official
Fa
,ctory
BMW
Enthusiast's
CompanionTM
BMW



Control
:
1980-1987
Charles
O
.
Probst,
SAE



Repair
Manual
:
1984-1988
Gasoline,
Car
Club
of
America
ISBN
0-8376-0321-8



ISBN
0-8376-0302-1



Turbo,
and
Turbo
Diesel,
including
Wagon

BMW
Notecards
Series
1
Photography
by



Bosch
Fuel
In1ection
and
Engne



and
Quattro
Audi
of
America
ISBN
0-8376-
i
Klaus
Schnitzer
ISBN
0-8376-0211-4



Management
Charles
O
.
Probst,
SAE



0370-6

ISBN
0-8376-0300-5



Audi
5000,
50005
Official
Factory
Repair
Manual
:
1977-1983
Gasoline
and
Turbo
VOLKSWAGEN
OFFICIAL
SERVICE



Gasoline,
Diesel
and
Turbo
Diesel
MANUUAS



Audi
of
America
ISBN
0-8376-0352-8

New
Beetle
Service
Manual
:
1998-1999



Audi
40005,
4000CS,
and
Coupe
GT
RobertBentley
ISBN
0-8376-0385-4



Official
Factory
Repair
Manual
:
1984-1987including
Quattro
and
Quattro
Turbo
Audi
Jetta,
Golf,
GTI,
Cabrio
Service
Manual
:



of
America
ISBN
0-8376-0373-01993-early
1999,
including
VR6
and
TDI
Robert
Bentley
ISBN
0-8376-0366-8



SAAB
OFFICIALSERVICE

1992-1999
Volkswagen
of
America



Saab
90016
Valve
Official
Service
Manual
:
ISBN
0-8376-0335-8



19851993
RobertBentl



ISBN
0837603129
-ey---

Saab
900
8
Valve
Official
Service
Manual
:
1981-1988
Robert
Bentley
ISBN
0-8376-0310-2

Passat
Official
Factory
Repair
Manual
:



VOLVO
SERVICE
MANUAL
1995-1997
Volkswagen
of
America



Volve
240
Service
Manual
:
1983-1993
ISBN
0-8376-0380-3



Robert
Bentley
ISBN
0-8376-0285-8

Robert
Bentley
has
published
service
manualsand
automobile
books
since
1950
.
Please
write
Robert
Bentley,
Inc
.,
Publishers,
at
1734
Massachusetts
Avenue,Cambridge,
MA
02138,
visit
our
web
síte
athttp
://www
.rb
.com,
or
call
1-800-423-4595
for
a
free
copy
of
our
complete
catalog,
including
titles
and
service
manuals
for
Jaguar,
Triumph,
Austin-Healey,
MG,
and
other
cars
.

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

Non-returnable
Parts

FUNDAMENTALS
FOR
THEDO-ITYOURSELF
OWNER
010-
7

Many
independent
repair
shops
make
a
point
of
using
genu-



Original
body
paneis
and
other
large
components
are
identi-

ine
BMW
parts,
even
though
they
may
at
times
be
more
expen-



fied
by
a
label
bearing
the
VINand
two
BMW
roundellogos
.
Re-

sive
.
Theyknow
the
value
of
doing
thejob
right
with
the
right



placement
parts
have
a
similar
label,
bearing
one
BMW
roundel

parts
.
Parts
from
other
sources
can
beas
good,
particularly
if



logo
and
the
letters
DOT-R
.
See
Fig
.
6
.
Parts
or
assemblies

manufactured
by
one
of
BMWs
original
equipment
suppliers,



bearing
the
label
arethe
engine,
transmission,
front
and
rear

but
it
is
often
difficult
to
know
.



bumpers,
front
fenders,
rear
quarter
paneis,
hood,
trunk
lid
and

doors
.
These
labels
shouldnot
be
removed
as
they
will
tear

BMW
is
constantly
updating
and
improving
their
cars,
often



apart
.

making
improvements
during
a
given
model
year
.
BMW
may

recommend
a
newer,
improved
part
as
a
replacement,
and

your
authorized
dealer's
parts
department
will
know
about
it

and
provide
it
.
The
BMW
parts
organization
is
best
equipped
to
deal
with
any
BMW
parts
needs
.

Some
parts
cannot
be
returned
for
credit,
even
if
they
arethe

wrong
parts
forthe
car
.
The
best
example
is
electrical
parts,

which
are
almost
universally
considered
non-returnable
be-



,
..

cause
they
are
so
easily
damaged
internally
.

Buy
electrícal
parts
carefully,
and
beas
sure
as
possible
that
P-
DOT~
R

a
replacement
is
needed,
especially
for
expensive
parts
such
as
electronic
control
units
.
It
may
bewise
to
let
an
authorized



B328FUN

BMW
dealeror
other
qualified
shop
confirm
your
diagnosisbe-

fore
replacing
an
expensive
part
that
cannot
be
retuned
.



Fig
.
6
.



Labels
used
to
identiy
parts
.
Original
equipment
labelwith

VIN
number
and
roundel
logos
(top)
and
replacement
part
la-

bel
with
one
roundel
logos

Information
You
Need
to
Know

Engine
.
3-Seriescars
covered
in
this
manualare
powered

Model
.
When
ordering
parts
it
is
important
that
you
know
the



by
either
a
4-or
6-cylinder
engine
.
For
information
-
on
engine

correct
model
designation
for
your
car
.
Models
covered
in
this



codes
and
engine
applications,
see100
Engine-General
.

manual
are
E36
3
Series
in
both
4-
and
6-cylinderconfigura-

tions
.



Transmission
.
The
transmissiontype
with
its
identifying

code
may
be
important
when
buying
clutch
parts,
seals,
gas

Moda¡
Year
.
This
is
not
necessarily
the
same
as
date
of



kets,
and
othertransmission-relatedparts
.
For
information
on

manufacture
or
date
of
sale
.
A
1997
model
may
havebeen



transmission
codes
and
applications,
see200
Transmission

manufactured
in
late
1996,
and
perhaps
not
sold
until
early



General
.

1997
.
It
is
still
a1997
model
.
Model
years
covered
by
this
man-

ual
are
1992
to
1998
.

SERVICE
Date
of
Manufacture
.
This
information
is
helpful
when
or-

dering
replacement
parts
or
determining
if
any
of
the
warranty



BMW
dealers
are
uniquely
qualified
to
provide
service
for
recalls
are
applicable
to
your
car
.
The
label
on
the
driver's
door



BMW
cars
.
Their
authorized
relationship
with
the
large
BMW
below
the
door
latch
will
specify
the
month
and
year
that
the
car



serviceorganization
means
that
they
are
constantly
receiving
was
built
.



new
tools
and
equipment,
together
with
the
latest
and
most
ac-

curate
repair
information
.
Vehicle
Identification
Number
(VIN)
.
This
is
a
combination

of
letters
and
numbers
that
identify
the
particular
car
.
TheVIN

appears
on
the
state
registration
document,
and
on
thecar
it-

self
.
One
location
isin
the
rear
of
the
engine
compartment,
en-

other
in
the
lower
left
comer
of
the
windshield
.

The
National
Highway
Traffic
Safety
Administration
(NHT-

SA)
requires
passenger
cars
with
a
high
theftrateto
have
the

VINmarked
on
specific
parts
of
thecar
when
manufactured
.
On

BMW
cars,
these
parts
are
identified
byan
adhesive
label
.

)WBADK00000000

0
000
0

The
BMW
dealers
service
technicians
are
highlytrained
and

very
capable
.
Unfke
most
independent
repair
shops,
autho-

rized
BMW
dealers
are
intensely
committed
tosupporting
the

BMW
product
.
They
share
the
owners
interest
in
BMW
value,

performance,
and
reliability
.
On
the
other
hand,
there
are
many

independent
shops
that
specialize
in
BMW
service
and
are
ca-

pable
of
doing
high
quality
repair
work
.
Checking
with
other

BMW
owners
for
recommendations
on
service
facilitiesis
a

good
way
to
leam
of
reputable
BMW
shops
in
yourarea
.

SERVICE

ignition

Table
b
.
Engine
Management
Systems



engine
has
high
mileage
.

Engine



1
System

4-cylinder
engines
M42
(1992-1995)



Bosch
DME
Ml
.7
M44
(1996-1998)



Bosch
DME
M5
.2
(OBD
II)

6-cylinder
engines
M50
(1992)



Bosch
DME
M3
.1
M50
VANOS
(1993-1995)



Bosch
DME
M3
.3
.1
M52
(1996-1998)



Siemens
MS41
.1
(OBD
II)
S50US
(1995)



Bosch
DME
M3
.3
.1
S52US
(1996-1998)



Siemens
MS41
.1
(OBD
II)

Both
the
4-cylinder
and
6-cylinder
engines
use
a
distributor-

less
ignition
system
with
individual
ignition
coils
for
each
cylin-

der
.

FuelDelivery

Pressurized
fuel
from
the
in-tank
fuel
pump
is
injected
via

solenoid-type
fuel
injectors
.
The
ECM
controls
the
opening

and
closing
of
the
injectors
by
switchingthe
ground
side
of

each
injector
circuit
.
The
exact
amount
of
fuel
injected
is
de-

termined
by
the
amount
of
timethe
injectors
are
open
.

Cooling
System

Whenever
the
engine
is
running,
acoolant
pump
circulates

coolant
through
the
engine
and,
if
either
heater
control
valves

are
open,
through
the
heater
core
in
the
passenger
compart-

ment
.
The
coolant
absorbs
excess
heat
and
carries
it
to
the
ra-

diator
where
it
is
transferred
into
the
passing
airstream
.
A

thermostat
controls
the
flow
of
coolant
through
the
radiator

based
on
engine
temperature
.

Lubrication
System

The
lubrication
system
is
pressurized
whenever
theengine

is
running
.
The
oil
pump
draws
oil
through
a
pickup
in
the
bot-

tom
of
the
oil
pan,thenforces
it
through
a
replaceable
oil
filter

and
finto
the
engine
oíi
passages
.

On
4-cylinder
engines,
the
oil
pump
is
mounted
to
the
front

engine
cover
.
On
6-cylinder
engines,thechain-driven
oil

pump
is
bolted
to
the
bottom
of
the
cylinder
block
.

A
pressure
relief
valve
limits
the
maximum
system
pres-

sure
.
A
bypass
valve
prevents
the
oil
filter
from
bursting
and

insures
engine
lubrication
should
the
filter
become
plugged
.

See
119
Lubrication
System
for
additional
information
.

ENGINE-GENERAL
100-
5

Various
versions
of
DME
systems
are
usedon
thecars
cov-



MECHANICAL
TROUBLESHOOTING
ered
by
this
manual
.
See
Table
b
.
Each
system
is
highly
adaptive
to
compensate
for
things
suchasengine
wear
and



When
troubleshooting
an
engine
that
fails
to
start
or
runs
vacuum
leaks
.



poorly,
first
check
its
mechanical
condition-particularly
if
the

Warnings
and
Cautions

For
personal
safety,
as
well
asthe
protection
of
sensitive
electronic
components,
the
following
warnings
and
cautions
must
be
adhered
to
during
all
troubleshooting,
maintenance,
and
repairwork
.

WARNING
-

"
The
ignition
system
produces
high
voltages
that
can
be
fatal
.
Avoid
contact
with
exposed
termi-
nals
anduse
extreme
caution
when
working
on
a
car
with
the
ignition
switched
on
or
the
engine
running
.

"
Do
not
touch
or
disconnect
any
high
voltage
ca-
bles
from
the
coil,
distributor,
orspark
plugs
while
the
engine
is
running
or
being
cranked
by
the
starter

"
Connect
and
disconnect
the
engine
manage-
ment
system
wiring
and
test
equipment
leads
only
when
the
ignition
is
switched
off
.

"
Gasoline
is
highly
flammable
and
its
vapors
are
explosive
.
Do
not
smoke
or
work
on
a
car
near
heaters
or
other
fire
hazards
when
diagnosing
and
repairing
fuel
system
problems
.
Have
a
fire
extínguisher
available
in
case
of
an
emergency
.

"
Disconnecting
the
battery
may
erase
fault
code(s)
stored
in
control
module
memory
.
Using
special
BMW
diagnosnnc
equipment,
check
for
fault
codes
prior
to
disconnecting
the
battery
cables
.
If
the
Check
Engine
lightis
illuminated,
see
On-

Board
Diagnostics
(OBD)
forfault
code
infor-
mation
.
If
any
other
system
faults
havebeen
de-tected
(indicated
byan
illuminated
warning
light),
see
an
authorized
BMW
dealer
.

CAUTION-

"
Prior
to
disconnecting
the
battery,
read
the
bat-
tery
disconnection
cautions
gíven
at
the
front
of
this
manual
on
page
viii
.

"
Do
notconnect
any
test
equipment
that
delivers
a
12-volt
power
supply
to
terminal15
(+)
of
the
ignition
coil
.
The
current
flow
may
damage
the

ECM
.
In
general,
connect
test
equipment
only
as
specified
by
BMW,
this
manual,
or
the
equip-
ment
maker
.

"
Do
not
disconnect
the
battery
with
the
engine
running
.
Do
notrunthe
engine
with
any
of
the
sparkplug
wires
disconnected
.

MECHANICAL
TROUBLESHOOTING

eiioo4

Fig
.
9
.



Remove
ignition
coils
on
6-cylinder
engine
by
disconnecting
harness
connector
and
removing
mounting
bolts
(arrows)
.

NOTE-

"
The
compression
gauge
reading
shoutd
increase
with
each
compression
stroke
and
reach
near
its
maxi-
mum
reading
in
about
4-6
strokes
.

"All
cylinders
shoutdreach
maximum
compression
in
the
same
number
of
strokes
.
If
a
cylinder
needs
sig-
nificantly
more
strokes
to
reach
maximum
compres-

sion,
there
is
a
problem
.

7
.
Release
the
pressure
at
the
compression
gauge
valve,

then
remove
the
gauge
from
the
spark
plughole
.
Re-

peat
the
test
for
each
of
the
other
cylinders
and
com-

pare
the
results
with
the
values
given
below
.

ENGINE-GENERAL
1
:00-
7

Compression
Pressure

"
Minimum
..........
.
.
..
..
10-11
bar
(142-156
psi)

"
Maximum
difference
between
cylinders
..
.....
.........
0
.5
bar
(7
psi)

Reinstall
the
spark
plugs
and
spark
plug
wires
or
ignition

cofs
.
The
remainder
of
installation
is
the
reverse
of
removal
.
Be
sure
to
reihstall
al¡
wires
disconnected
during
the
test,
especial-

¡y
ground
wires
at
the
coils
and
cylinder
head
cover
(where
ap-
plicable)
.

Tightening
Torque

"
Spark
plug
to
cylinder
head
.......
25
Nm
(18
ft-Ib)

Low
compression
indicates
a
poorly
sealed
combustion

6
.
With
the
parking
brake
set,
the
transmission
in
Park
or



chamber
.
Relatively
even
pressures
that
are
below
specification

Neutral,
and
the
accelerator
pedal
pressed
to
the
floor,



normally
indicate
worn
piston
rings
and/or
cylinder
walls
.
Erratic

crank
the
engine
with
the
starter
.
Record
the
highest



values
tend
to
indicate
valve
leakage
.
Dramatic
differences
be

value
indicated
by
the
gauge
.



tween
cylinders
are
often
the
sign
of
a
failed
head
gasket,

bumed
valve,
or
broken
piston
ring
.

Engine
Mechanical
Troubleshooting
Table

Table
c
lists
the
symptoms
of
common
engine
mechanical

problems,
their
probable
causes
and
the
suggested
corrective

actions
.
The
bold
type
indicates
the
repair
groups
where
appli-

cable
test
and
repair
procedures
can
befound
.

MECHANICAL
TROUBLESHOOTING

113-
6



CYLINDER
HEAD
REMOVAL
AND
INSTALLATION

32
.
Using
Torx
E12
socket,
remove
cylinder
head
bolts
in



2
.
Check
gasket
surface
of
cylinder
head
and
cylinder

the
sequence
indicated
.
See
Fig
.
15
.
Remove
cylinder



block
for
warpage
using
a
straight
edge
.

head
and
head
gasket
.
Discard
head
boits
.



3
.
On
M42
engine
:
Be
sure
oil
feed
check
valve
and
spac-

er
are
correctly
positioned
in
block
.
See
Fig
.
16
.

0012502

Fig
.
15
.
Cylinder
head
bolt
loosening
sequence
.
Use
Torx
El
2
socket
.

Cylinder
head,
installing

(4-cylinder
engine)

CAUTION-

If
the
camshafts
were
removedrínstalled
while
the
cylinder
head
was
off,
a
minimum
wafting
time
ís
requíred
after
installing
the
camshafts
.
When
the
camshafts
are
removed,
the
hydraulic
lifters
canexpand
.
This
expansion
can
cause
fncreased
valve
lift,
resultíng
in
open
valves
and
pfston
con-
tact

Cylinder
head
installation
waiting
times

"
Ator
above
68°F
(20°C)
...............
10
minutes
"50-68°F
(10-20°C)
.
.
..
...............
30
minutes

"
32-50°F
(0-10°C)
..
.
..
...............
75
minutes

1
.
Clean
cylinder
head
and
gasket
surfaces
of
cylinder
block
and
al¡
timing
chain
covers
.

"
Remove
al¡
foreign
matter
and
any
¡¡quid
from
bolt
holes,
then
clean
with
a
thread
chaser
.

CAUTION-

Do
not
useametal
scraper
or
wire
brush
to
clean
the
alumfnum
cylinder
head
or
pistons
.
If
neces-
sary,
useahard
wooden
or
plastic
scraper
.
Also
available
are
abrasivediscs
to
be
used
ín
conjunc-
tionwíth
an
electric
dril¡
.
Be
sure
to
use
the
correct
disc
for
the
type
of
metalbeingcleaned
.

CYLINDER
HEAD,
4-CYLINDER

Fig
.
16
.
Oil
feed
check
valve
and
spacer
used
on
M42
engine
.
Install
check
valvewíth
collar
(arrow)
facing
down
.

CAUTION-

If
the
check
valve
is
not
installed
correctly,
oil
flow
to
the
cylinder
head
would
be
restrícted
.

4
.
Place
new
cylinder
head
gasket
on
surface
of
cylinder

block
.
Check
that
two
locating
dowels
are
correctly
po-

sitioned
in
block
and
not
damaged
.

CAUTION-

The
word
"OBEN",
prfnted
on
the
gasket,
should
face
up
.

5
.
Place
new
rubber
profile
gasket
in
groove
of
front
cover
.

6
.
With
camshafts
locked
in
TDC
positionwith
BMW
spe-
cial
tool
as
described
earlier,
set
cylinder
head
in
posi-
tion
.

CAUTION-

"
The
camshafts
mustbe
focked
in
the
TDC
posi-
tion
at
the
rear
of
the
cylinder
head
with
BMW
specfal
tool
no
.
113240
before
installing
the
cyl-
inder
head
.

"
Make
sure
the
crankshaft,
which
had
been
rotat-
ed
approximately
45°
opposite
the
dfrection
of
engine
rotation,
is
still
in
thatposition
before
low-
ering
the
cyffnder
head
ínto
position
.

"
Torx-type
cylinder
head
bolts
should
not
be
re-
used
.
They
are
stretch-type
bolts
and
must
al-
waysbe
replaced
whenever
loosened
.

NOTE-

Cylinder
head,
installing

(6-cylinder
engine)

CAUTION-

If
the
camshafts
were
removed
and
installed
while

the
cylinder
head
was
off,
a
minimum
waiting
time

is
required
after
ínstalling
the
camshafts
.
When

the
camshaftsareremoved,
the
hydraullc
lifters

can
expand
.
This
expansion
can
cause
increased

valve
lift
when
the
camshafts
are
bolted
down,
re-

sulting
in
open
valves
.

Cylinder
head
installation
waiting
times

"
68°F
(20°C)
and
higher
.
.
.
..
..........
10
minutes

"
50-68°F
(10-20°C)
........
..
.........
30
minutes

"
32-50°F
(0-10
°C)
.........
...
........
75
minutes

CYLINDER
HEAD
REMOVAL
AND
INSTALLATION



113-
1
5

1
.
Clean
cylinder
head
and
gasket
surfaces
of
cylinder

block
and
al¡
timing
chain
covers
.

"
Remove
all
foreign
matter
and
any
¡¡quid
from
bolt

holes,
then
clean
with
a
thread
chaser
.

CA
UTION-

Do
not
use
ametal
scraper
or
wire
brush
to
clean

the
aluminum
cylinder
head
or
pistons
.
If
neces-
sary,
use
a
hard
wooden
or
plastic
scraper
.
Also

available
are
abrasive
discs
to
be
used
in
conjunc-
tion
with
an
electric
drill
.
Be
sure
to
use
the
correct
disc
for
the
typeof
metal
being
cleaned
.

2
.
Check
gasket
surface
of
cylinder
head
and
cylinder

block
for
warpage
using
a
straight
edge
.

NOTE-

Fig
.
40
.
Cylinder
head
bolt
loosening
sequence
.



If
the
cylinder
head
has
been
machined,a
special
0
.3

mm
thickergasketshould
be
installed
.
The
thickergas-

ket
is
available
from
an
authorized
BMW
dealer
.

BMW
special
tool
no
.
112250
is
a
thin-walled
Torx
E12

socket
wíth
anextended
reach
.
The
cylinder
head
bolts



3
.
Place
new
cylinder
head
gasket
on
cylinder
block
.

are
recessed
finto
the
head
below
the
camshaft
towers



Check
that
two
locating
dowels
are
correctly
positioned

wíth
liffle
working
space
.



in
block
and
arenot
damaged
.

36
.
Remove
crankshaft
locking
tool
(BMW
special
tool
no
.



NOTE-

11
2
300)
.
Using
the
crankshaft
vibration
damper
bolt,



The
word
"OBEN",
printed
on
the
gasket,
should
face

turn
engine
opposite
its
normal
direction
of
rotation



up
.Thecylinderheadgasketwillfitcorrectlyinonlyone

(counterclockwise
asviewed
from
the
front)
approxi-



orientation
.

mately
45°
.
This
prevents
accidental
contact
between

valves
and
pistons
during
installation
.



4
.
With
camshafts
locked
in
TDC
positionwith
BMW
spe-

cial
tools
as
described
earlier,
set
cylinder
head
in
po

NOTE-



sition,
guiding
primary
chain
through
cylinder
head
Guide
cam
chain
to
keep
it
from
jamming
when
turning



opening
.

the
crankshaft
.
CA
UTION-

"
The
camshafts
must
be
locked
in
the
MC
posi-

tion
at
the
rear
of
the
cylinder
head
with
BMW

special
tool
no
.
113240
before
installing
the
cyl-

inder
head
.

"
Make
sure
the
crankshaft,
which
had
been
rotat-

ed
approximately
45°
opposite
thedirection
of
engine
rotation,is
still
in
that
position
before
low-
ering
the
cylinder
head
into
position
.

5
.
Lightly
lubricate
new
cylinder
head
bolts
.
Loosely
instan
bolts
and
their
washers,
then
thread
them
in
until
they

are
finger
tight
.
Install
cylinder
head-to-lower
timing

chaincover
boitsfinger
tight
.

CAUTION-

Tonc-type
cylinder
head
bolts
should
not
be
re-

used
.
They
are
stretch-typebolts
and
must
always
be
replaced
whenever
loosened
.

CYLINDER
HEAD,
6-CYLINDER

119-
8



LUBRICATION
SYSTEM

17
.
Installation
is
reverse
of
removal
.

"
Thoroughly
clean
all
old
gasket
material
from
mating

surtaces
anduse
a
new
gasket
.

"
Applya
small
amount
of
non-hardening
sealer
(3-Bond

1209
0
or
equivalent)
to
oil
pan
gasket
directly
below

joints
for
and
cover
and
front
timing
case
cover
.
See

Fig
.
12
.

"
Tighten
oil
pan
bolts
starting
at
front
first,
working
to-

wardback
(transmission)
end
.

"
Fill
engine
with
oil
as
described
in
020
Maintenance

Program
.

"
After
addingengine
oil,
start
and
run
engine
.
Raiseen-

gine
speed
to
2,500
rpm
until
oíl
pressure
warning

lampgoes
out
(about
5seconds)
.

OIL
PUMP

applied
(arrows)
.
Apply
a
bead
3
mm
wideby
2
mm
high
.

WARNING
-

"
Always
use
new
bolts
when
mounting
the
sub-

frame
to
the
body
.
The
one-time
only
bolts
should
be
replaced
any
timethey
are
removed
.

"
Special
installation
instructions
apply
when
in-
stalling
the
front
suspension
crossmember
to
the
body
.
See
310
Front
Suspension
for
fastener
specifications
and
tightening
torques
.

Fig
.
12
.
Joint-mating
areas
at
oil
pan
gasket
where
sealer
should
be

Center
the
steering
spindle
to
the
steering
rack
before
in-

stalling
the
steering
column
shaft
.
See
320
Steering
and

Wheel
Alignment
for
more
specific
procedures
.

Tightening
Torques

"
Control
arm
bushing
carrier

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

"
Engine
mount
to

suspension
crossmember(M10
nut)
..
42
Nm
(31
ft-Ib)

"
Oil
pan
to
engine
block
(M6
bolt)

8
.8
grade
...........
.......
....
10
Nm
(89
in-lb)

10
.9
grade
...........
..
...
...
.
12
Nm
(106
in-lb)

"
Stabilizer
bar
link

to
control
arm
(M10
nut)
.......
....
42
Nm
(31
Ib-ft)

"
Steering
column
universal
joint

to
steering
rack
spindle
(M8
bolt)
....
19
Nm
(14
ft-Ib)

"
Suspensíon
crossmember

to
body
...
...
.
...
..
.
.
See
310
Front
Suspension

OIL
PUMP

Oil
pump,
removing
and
installing

(4-cylinder
engine)

Oil
pressure
on
M42
and
M44
engines
is
generatedbya

gear-type
pump
mounted
to
the
rear
of
the
front
engine
cover

(timing
chaincase)
.
The
pump
is
gear-driven
off
the
front
of

the
crankshaft
.

NOTE-

Oil
pump
removal
requires
lowering
of
the
front
sus-

pension
and
removal
of
the
oil
pan,
as
well
asremoval
of
the
timing
chain
assembly
.

1
.
Disconnect
negative
(-)
battery
cable
from
battery
.

CAUTION-

Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
on
paga
vÍii
.

2
.
Drain
engine
oil
as
described
in
020
Maintenance
Pro-

gram
.

3
.
Withengine
cold,
drain
coolant
.
See
170
Radiator
and

Cooling
System
.

4
.
Remove
top
cover
from
oil
filter
housing
to
allow
engine

oil
to
drain
into
oil
pan
.
Remove
oil
pan
as
described

earlier
.
Reinstall
oil
filter
cover
.

5
.
Remove
alternator
.
Unbolt
power
steering
pump
from

bracket,
then
remove
alternator
mountíng
bracket
.
See

121
Battery,
Starter,
Alternator
.

6
.
Remove
crankshaft
vibration
damper
andhub
.
Then
re-

move
upper
and
lower
timing
chain
covers,
complete

timingchain,
chain
sprockets
and
chain
guides
.
See

117
Camshaft
Tíming
Chain
.