engine coolant BMW 325i 1992 E36 User Guide
Page 36 of 759
020-
1
4
MAINTENANCE
PROGRAM
uu11989
Fig
.
14
.
Engine
drive
belt
tensíoner
being
released
on
late
4-cylinder
engine
.
Pry
off
tensioner
cover
and
then
lever
tensioner
in
clockwise
direction
(as
facing
engine)
and
slip
beltoff
pulleys
.
Fig
.
17
.
Engine
drive
belt
routing
for
late
4-cylinder
engine
with
poly-
ribbed
drivebelts
.
CA
UTION-
Use
only
BMW
approved
phosphate-free
anti-
freeze
when
filling
the
cooling
system
.
Use
of
anti-
B11177
freeze
containing
phosphates
!s
considerad
to
be
Fig
.
15
.
Engine
drive
belt
tensioner
being
released
on
6-cylinder
en-
harmful
to
the
cooling
system
.
gine
.
Pry
off
tensioner
cover
and
then
lever
tensioner
in
clock-
wise
direction
(as
facing
engine)
and
slipbelt
off
pulleys
.
A
translucent
expansion
tank,
or
overflow
resenroir,
providesmonitóring
of
coolant
leve¡
.
Because
the
expansion
tank
is
translucent,
thecoolant
level
can
be
checked
visually
without
opening
the
system
.
Always
check
thecoolant
leve¡
with
theen-gine
cold
.
The
coolant
leve¡
should
be
at
the
maximum
mark
on
O
o
'~
I
the
expansion
tank,
as
shown
in
Fig
.
18
.
OO
Hose
connectionhld
b
tiht
s
soueg
an
ddry
.
Coolánt
seepage
indicates
either
that
the
hose
clamp
is
loose,
that
the
pose
is
ENGINE
COMPARTMENT
MAINTENANCE
0012470
Fig
.
16
.
Engine
drive
belt
routing
for
6-cylinder
engine
.
A/C
compres-
sor
drive
belt
not
shown
.
'92
irá
Alternator
belt
Coolant~
0
pp
o0o
Belt
tensioner
Cooling
System
Service
0013000
Cooling
system
maintenance
consists
of
maíntaining
thecoolant
leve¡,
inspecting
hoses
.
Because
the
coolant's
anti-cor-
rosion
and
anti-freeze
additives
gradually
lose
their
effective-
ness,
replacement
of
thecoolant
every
two
years
up
to
1996
models,
and
every
three
years
from
1996
is
recommended
.
Asa
preventive
measure,
replacement
of
the
cooling
system
hos-
es
every
four
years
is
also
recommended
.
damaged,
or
that
the
connection
is
dirty
or
corroded
.
Dried
cool-
ant
has
a
chalky
appearance
.
Hoses
should
be
firm
and
springy
.
Replace
any
hose
that
is
cracked,
that
has
become
soft
and
limp,
or
has
been
contaminated
by
oil
.
See
Fig
.
19
.
Power
steering
fluid,
checking
leve¡
Check
the
power
steering
fluid
level
in
the
fluid
reservoir
.
Park
thecar
on
leve¡
ground
with
the
engine
off
.
The
level
is
cor-
rect
if
it
is
between
the
MIN
and
MAX
marks
on
the
dipstick
.
See
Fig
.
20
.
If
the
leve¡
is
below
the
MIN
mark,
start
the
engine
andadd
fluid
to
the
reservoir
to
bríng
the
leve¡
up
.
Stop
the
engine
and
recheck
the
leve¡
.
Hand-tighten
the
reservoir
cap
.
Page 37 of 759
Fig
.
18
.
Fill
mark
on
coolant
expansion
tank
.
Coolant
level
should
be
at
mark
when
engine
ís
cold
.
.
..
e
..
.-
..
~
..
.-
.
Ozone
Damaged
Hose
0012476
Fig
.
19
.
Examples
of
damage
to
coolant
hoses
.
Any
of
conditions
shown
is
cause
for
replacement
.
Courtesy
of
Gates
Rubber
Company,
Inc
.
Specification
"
Power
steering
fluid
..........
.
...
Dexron
III®ATF
Oxygen
Sensors
1996
and
later
engines
are
equipped
withmultiple
oxygen
sensors
.
See
Fig
.
21
.
A
regulating
sensor
is
mounted
before
each
catalytic
converter
and
amonitoring
sensor
downstream
of
each
converter
.
The
regulating
sensor
monitors
engine
com-
bustion
efficiency
and
helps
to
control
the
fuel
injection
system
and
exhaust
emissions
.
The
monitoring
sensor
is
usedby
the
On-board
diagnostic
system
to
monitor
the
function
of
the
cata-
lytic
converter
.
MAINTENANCE
PROGRAM
020-
1
5
NOTE-
5pecialsockets
for
replacingthe
oxygen
sensor
are
available
from
most
automotive
parts
stores
.
The
sock-
et
has
agroove
cut
down
one
side
to
allow
the
sensor
to
be
installed
without
damaging
the
wire
hamess
.
Fig
.
20
.
Power
steering
fluid
dipstick
showing
MIN
and
MAX
marks
.
OBD
II
enhanced
emission
standards
require
the
engine
control
module
(ECM)
to
monitor
the
oxygen
content
in
theex-
haust
bothbefore
and
after
the
catalytic
converter
.
This
allows
for
tightercontrol
of
the
tail
pipe
emissions
and
also
allowsthe
ECM
to
diagnose
converter
problems
.
lf
the
DME
detects
that
catalytic
converter
or
oxygen
sensor
efficiency
has
degraded
past
a
certain
pre-programmed
limit,
it
will
turn
on
the
Check
Engine
light,
and
store
a
diagnostic
trouble
code
(DTC)
in
the
ECM
.
Replacement
of
oxygen
sensors
at
the
specified
intervals
en-
sures
that
the
engine
and
emission
control
system
wíll
continue
to
operate
as
designed
.
Extending
the
replacement
interval
may
void
the
emission
control
warranty
coverage
.
See
180
Ex-
haust
System
for
information
on
replacing
the
oxygen
sen-
sors
.
Tightening
Torque
"
Oxygen
sensor
to
exhaust
system
........
.
.
.
..
55±5
Nm
(40±4
ft-Ib)
ENGINE
COMPARTMENT
MAINTENANCE
Page 43 of 759
GENERAL
.
.....
.
.
.
.
.
.
.
...
.
.
.
.
.
.
.
.
.
...
100-1
Cylinder
Block
and
Crankshaft
.
.
.
.
.
.
.
.
.
...
100-1
Connecting
Rods
and
Pistons
.
.
.
.
.
.
.
.
.
.
.
.
.
100-1
Cylinder
Head
and
Valvetrain
.
.
.
.
.
.
.
.
.
.
.
.
.
100-2
VANOS
(Variable
Valve
Timing)
.
.
.
.
.
.
.
.
...
100-2
DISA
(Dual
Resonance
Intake
System)
.
.
.
.
.
100-3
Engine
Management
System
.
.
.
.
.
.
.
.
.
.
.
.
.
100-3
Ignition
......
.
.
.
.........
.
.
.
.
.
.
.
.
.
.
.
.
100-5
Fuel
Delivery
..
.
.
.
.....
.
...
.
.
.
.
.
.
.
.
.
.
.
.
100-5
Cooling
System
.
...........
.
.
.
.
.
.....
.
.
100-5
Lubrication
System
.........
.
.
.
.
.
.
.
.
.
.
.
.
100-5
MECHANICALTROUBLESHOOTING
.
.
.
.
100-5
Warnings
and
Cautions
..
.
...
.
.
.
.
.
.
.
.
.
.
.
.
100-5
Cylinder
compression,
checking
.
.
.
.
.
.
.
.
.
.
.
100-6
EngineMechanical
Troubleshooting
Table
.
.
.
100-7
DRIVEABILITY
TROUBLESHOOTING
...
100-8
GENERAL
There
are
various
engíne
configurations
used
in
the
1992-
1998
E36
cars
.
See
Table
a
.
On
both
four-
and
6-cylinder
engines,
the
cylinder
block
is
cast
¡ron
with
integral
cyiinders
.
The
cyiinders
are
exposed
on
all
sides
to
circulating
coolant
.
The
fully
counterweighted
crankshaft
rotates
in
replaceable
split-shell
main
bearings
.
Oiiways
drilled
into
the
crankshaft
pro-
vide
bearing
lubrication
.
O¡I
seals
pressed
into
alloy
sea¡
hous-
ings
are
installedat
both
ends
of
the
crankshaft
.
100
Engine-General
Tablea
.
Engine
Specifications
ENGINE-GENERAL
100-1
On-Board
Diagnostics
(OBD)
...
.
.
.
.
.
.
.
.
.
.
.
100-8
Basic
Requirements
....
.
.
.
...
.
.
.
.
.
....
.100-11
Preventive
Maintenance
......
.
.
.
.
.
.....
100-11
Basic
Engine
Settings
..
.
.....
.
.
.
.
.
.....
100-11
Oxygen
Sensors
.
.
.
...
.
.
.
...
.
.
.
.
.
....
.100-11
Air
Flow
Measurement
and
Vacuum
Leaks
.
.100-12
Battery
Voltage
.
.
...........
.
.
.
.
.
.....
100-12
Wiring
and
Harness
Connections
.
.
.
.
.....
100-13
Ground
Connections
...
.
.....
.
.
.
.
.
.....
100-13
Fue¡
Supply
....
.
...........
.
.
..
.....
.100-14
TABLES
a
.
Engine
Specifications
...
...
...........
.
..
..
.100-1
b
.
Engine
Management
Systems
..
..
...........
..
100-5
c
.
Engine
Mechanical
Troubleshooting
..........
.
.
100-8
d
.
OBD
1
Fault
(Blink)
Codes
(1992-1995
models
only)
.
...
..
..
..........
..
.100-9
e
.
Engine
Driveability
Troubleshooting
...........
.100-15
Model
Engine
code
No
.
of
Dispiacement
Compression
Horsepower
cyiinders
liters
(cu
.
in
.)
ratio
SAE
net
@
rpm
318i/is/¡C
1992-1995
M42
4
1
.8
(109
.6)
10
.0
:1
100
@
6000
1996-1998
M44
4
1
.9
(115
.6)
~
10
.0
:1
103
@
6000
323ís/iC
1998
M52
6
2
.5
(152
.2)
10
.5
:1
168
@
5,500
325i/is/iC
1992-1995
M50
6
2
.5
(152
.2)
10
.0
:1
110
@
5,900
328i/is/iC
1996-1998
M52
6
2
.8
(170
.4)
10
.2
:1
190
@
5,300
M3
1995
S50US
6
3
.0
(182
.5)
10
.5:1
240
@
6,000
1996-1998
S52US
6
3
.2
(192
.3)
10
.5:1
240
@
6,000
Cylinder
Block
and
Crankshaft
Connecting
Rods
and
Pistons
The
forged
connecting
rods
use
replaceable
split-shell
bearings
at
the
crankshaft
endand
solid
bushings
at
the
pis-
ton
pin
end
.
The
pistonsare
of
the
three-ring
typewith
two
up-
per
compression
rings
and
a
lowerone-piece
o¡i
scraper
ring
.
Fui¡-floating
piston
pins
are
retained
with
circlips
.
GENERAL
Page 46 of 759
100-4
ENGINE-GENERAL
'
TEMP
PRECAT
POST
CAT
OXYGENSENSOR
HEATING
#
.
THROTTLE
POSITION
FUEL
INJECTOR
CONTROL
(SEQUENTIAL)
OPERATING
POWER
00
CAMSHAFT
POSITION
SENSOR
ECM
I
MAIN
GROUND
RELAY
J_
-
AC
COMPRESSOR
RELAY
CONTROL
TERMINAL
15
MEMORY
POWER
FUEL
PUMP
RELAY
CONTROL
AUX
GROUND
P
CRANKSHAFT
POSITION
dESENSOR
INTAKE
AIR
ENGINE
COOLANT
TEMP
FUEL
TANK
PRESSURE
SENSOR
S-EML
S-MSR
ASC
S-ASC
VEHICLE
SPEED
LOW
FUEL
LEVEL
A/C
SWITCH
ON
(AC)
E36
IHKA
COMPRESSOR"ON"
SIGNAL
(KO)
INDIVIDUAL
SERIAL
NUMBER
MS41
.1
SECONDARY
AIR
1NJECTION
AIR
PUMP®
RELAY
CONTROL
IDLE
CONTROL
VALVE
'M
FUEL
INJECTION
(TI)
ENGINE
SPEED
(TD)
Fig
.
5
.
Siemens
MS
41
.1
OBD
II
engine
management
systemusedon
1996
and
later
M52
engines
.
GENERAL
IGNITION
COILS
CONTROL
L
r"Q
if~
CIYVFIYC
CHE
AMP
CONTROL
ENGINE
THROTTLE
POSITION
6
ECM
RELAY
CONTROL
ASC
THROTTLE
..
:
.
.
..
-11
1Q\\\
POTENTIOMETER
POWER
CAN
TCM
II
SCAN
(DES
;
ER
DIAGNOSIS
OBD
II
I
II
GENERIC
SCANTOOL
0012596
Page 47 of 759
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
Page 51 of 759
NOTE-
"
On
carswith
OBD
ti,
specialized
OBD
11
scan
tool
equipment
must
be
used
to
access
the
DTCs,
either
using
the
BMW
special
tool
ora
`generic"
OBD
11
scan
tool
.
See
130
Fuel
Injection
.
"
The
08D
11
fault
memory
(including
an
iiluminated
Check
Engine
light)
can
only
be
reset
using
the
spe-
cial
scan
tool
.
Removing
the
connector
from
the
ECM
or
disconnecting
the
battery
will
not
erase
the
fault
memory
.
Table
d
.
OBD
1
Fault
(Blink)
Codes
(1992-1995
modeis
only)
Graphic
representation
of
flashing
Check
Engine
light
fault
code
:
1221
5
Seconds
.
:-
2
.5~-
--05--
Fault
code
and
meaning
1
Corrective
action
Code
1216
:
Throttle
potentiometer
Code
1218
:
Output
stage,
group#1
(DME
3
.3
.ionly)
Code
1219
:
Output
stage,
group
#2
(DME
3
.3.1
only)
Code
1221
:
Oxygen
sensor
#1
Code
1224
:
Air
temperature
sensor
(NTC)
Code
1226
:
Knock
sensor
#2
(DME
3
.3
.1
only)
130
ENGINE-GENERAL
100-
9
2
.5
seconds,
then
go
off
for
2
.5
seconds
.
At
thispoint,
the
fault
codes
will
begin
to
flash
.
See
Table
d
.
If
more
than
one
fault
has
been
detected,
eachcode
will
be
separated
by
a2
.5
second
pause
.
When
al¡
fault
codes
havebeen
displayed,
there
will
be0
.5
second
flash
and
thenthe
light
will
remain
off
.
To
read
the
codes
again,
turn
the
key
off
and
then
on
again
.
Depress
theaccelerator
pedal
to
the
floor
five
times
quickly
(within
5
seconds)
.
The
codes
will
begin
to
repeat
.
On
cars
with
OBD
I,
fault
codes
can
be
read
by
turning
the
To
erase
the
fault
code
memory,
first
make
sure
the
fault
ignition
key
on
and
fully
depressing
theaccelerator
pedal
to
code
1000
(short
blink
and
then
light
goes
out
for
long
period)
the
floor
five
times
within
five
seconds
.
TheCheck
Engine
is
present,
then
depress
the
throttle
fully
for
at
least
10
sec-
light
will
then
remain
on
for
five
seconds,
blink
off,
come
on
for
onds
.
Read
the
fault
codes
as
described
earlier
and
check
for
the
1444
code
(no
faults
stored)
.
-,--------------
Check
Engine
light
on
Check
Engine
light
off
Code
1211
:
DM
E
Control
Module
DME
control
module
may
be
faulty
.
This
code
appears
if
the
control
module
fails
the
self
test
.
Check
inputsto
control
module
.
Repair
Group
130
Code
1215
:
Mass
air
flow
sensor
Check
air
flow
or
mass
air
flow
sensor
and
wiring
to
sensor
.
Repair
Group
130
Test
throttle
potentiometer
resistance
and
wiring
.
Repair
Group
130
Test
DME
control
module
input/outputs
.
Repair
Group
130
Test
DME
control
module
input/outputs
.
Repair
Group
130
Check
sensor
output
signal
to
DME
control
module
.
Repair
Group
Code
1222
:
Oxygen
sensor
lean/rich
control
stop
Check
for
intake
air
leaks
or
reasons
forrich
míxture
.
See
Driveabil-
ity
Troubleshooting
given
earlier
in
this
repair
group
Code
1223
:
Coolant
temperaturesensor
(NTC)
1
Test
coolant
temperature
sensor
.
Repair
Group
130
Test
intake
air
temperature
sensor
.
Repair
Group
130
Code
1225
:
Knock
sensor#1
(DME
3
.3
.1
only)
1
Check
knocksensorand
sensor
wiring
.
Repair
Group
120
Check
knocksensor
and
sensor
wiring
.
Repair
Group
120
Code
1231
:
Batteryvoltage
monitor
Test
battery
voltage
and
battery
check
charging
system
and
starter
.
Repair
Group
121
Code
1234
:
Speedometer
"A"signal
(DME
3
.3
.1
only)
Check
wiring
between
instrument
cluster
and
DME
control
module
.
Electrical
Wiring
Diagrams
Code
1237
:
A/C
compressor
cutoff
(DME
3
.3
.1
only)
Test
DME
control
module
inputs/outputs
from
A/C
system
.
Repair
Group
130
Code
1242
:
A/C
compressor
signal
(DME
3
.3.1
only)
Test
DME
control
module
inputs/outputs
from
A/C
system
.
Repair
Group
130
DRIVEABILITY
TROLIBLESHOOTING
Page 60 of 759
110-2
ENGINE
REMOVAL
AND
INSTALLATION
8
.
Drain
engine
coolant
andremove
coolant
hoses
at-
10
.
Remove
radiator
cooling
fan
and
radiator
as
described
tached
to
cylinder
head
.
in
170
Radiator
and
Cooling
System
.
"
Drain
radiator
and
engine
block
.
See
170
Radiator
and
Cooling
System
.
NOTE-
"
Disconnect
hoses
from
thermostat
housing
at
front
of
Some
late
4-cylinder
modelsuse
an
electric
prímary
cylinder
head
.
cooling
fan
.
"
Disconnect
heater
hoses
at
rear
of
engine
.
See
Fig
.
2
.
CAUTION-
NOTE-
On
cars
with
viscous-type
cooling
fans,
the
radia-
"
The
block
drain
plug
is
located
on
the
exhaust
side
to-
tor
fan
has
left
hand
threads
.
wards
rear
of
engine
.
"
Remove
small
plastic
lock
clíp
to
pull
radiator
drain
11
.
Remove
upper
intake
manifold,
unfasten
cable
duct
plug
out
completely
.
from
lower
intake
manifold,
crankcase
vent
valve
hose
(M44
engine
only)
0012687
Fig
.
2
.
Coolant
hoses
at
heater
valve
and
heatercore
to
be
discon-
nected
(arrows)
.
9
.
Remove
air
shroud
from
top
of
radiator
.
See
Fig
.
3
.
ENGINE
REMOVAL
AND
INSTALLATION
12
.
Disconnect
fuel
supply
and
fuel
return
lines,
main
en-
gine
electrical
connectors,
and
lower
intake
manifold
as
described
in
113
Cylinder
HeadRemoval
and
Instal-
lation
.
See
Fig
.
4
.
0012504
Fig
.
4
.
Crankcase
ventvalve
(A)
on
top
of
lower
intake
manifoldof
M44
engine
.
Fueldelivery
and
retum
lines
shown
at
B
.
Engine
harness
and
sensor
connectors
shown
at
C
.
WARNING
-
"
Fuel
may
be
expelled
under
pressure
.
Do
not
smoke
orworknear
heaters
or
other
fire
haz-
ards
.
Keep
a
fire
extinguisher
handy
.
Before
dis-
connecting
fuel
hoses,
wrap
a
cloth
around
fuel
hoses
to
absorb
any
leaking
fuel
.
Plug
all
open
fuel
lines
.
"
Always
unscrew
the
fuel
tank
cap
to
release
pres-
sure
in
the
tank
before
working
on
the
tank
or
lines
.
CAUTION-
0013137
I
Stuff
clean
rags
into
the
open
intake
ports
topre-
Fig
.
3
.
Front
air
shroud
mounting
screws
(arrows)
.
vent
any
parts
from
falling
into
the
engine
intake
.
13
.
Disconnect
vacuum
hose
from
brake
booster
on
bulk-
head
.
Cover
bothhole
in
booster
and
plug
hose
end
.
Page 61 of 759
14
.
Unbolt
power
steering
fluid
reservoir
from
íts
mounting
bracket
.
Use
stiff
wire
to
hang
reservoir
to
one
side
.
Do
not
disconnect
fluid
lines
.
15
.
Remove
power
steering
pump
drive
belt
and
remove
pump
from
its
mounting
bracket
.
Use
stiff
wire
to
hang
pump
from
body
.
16
.
On
cars
with
automatic
transmission
remove
front
and
rear
brackets
holding
automatic
transmission
cooler
linesto
engine
.
17
.
Remove
A/C
compressor
from
its
mounting
bracket
without
disconnecting
any
refrigerantlines
.
See
Fig
.
5
.
ENGINE
REMOVAL
AND
INSTALLATION
110-
3
21
.
Remove
front
exhaust
pipefrom
exhaust
manifold
.
See
Fig
.
6
.
22
.
Install
an
engine
lifting
device
and
raise
engine
until
its
weight
is
supported
.
Remove
nuts
and
ground
strap
from
left
and
right
engine
mounts
.
0011967
Fig
.
6
.
Front
exhaustpipe
to
exhaust
mounting
nuts
(arrows),
as
viewed
from
below
on
4-cylinder
engine
.
23
.
Carefully
raíse
engine
out
of
car,
checking
for
any
wir-
ing
harnesses,
fuel
lines,
or
mechanical
parts
that
might
become
snagged
as
engine
is
removed
.
24
.
Installation
is
reverse
of
removal,
noting
the
following
:
"
Replace
all
gaskets,
O-rings
and
seals
.
"
Change
engine
oil
and
filter
and
check
al¡
other
fluid
levels
.
See020
Maintenance
Program
.
"
Refill
and
bleed
cooling
system
.
See
170
Radiator
and
Cooling
System
.
"
Insta¡¡
the
front
exhaust
pipes
using
new
gaskets
and
self-locking
nuts
.
Use
copper
pasteon
threads
.
See
180
Exhaust
System
.
Tightening
Torques
"
Coolant
drain
plug
to
cylinder
block
.
25
Nm
(18
ft-Ib)
Fig
.
5
.
A/
C
compressor
mounting
bolts
(arrows)
.
"
Engine
mount
to
subframe
M8
......:...
..
..
..
......,:..
22
Nm
(17
ft
-
1b)
,
18
.
Move
A/C
compressor
out
of
way
without
distorting
or
M10
.
...
.
..
...
.
.
...........
45
Nm
(33
ft'-Ib)
damaging
any
lines
.
Support
compressor
by
hanging
it
"
Intake
manifold
to
cylinder
head
from
chassis
using
stiff
wire
.
M7
.....
.
..
...
..
..
...........
15
Nm
(11
ft-Ib)
M8
...
.
.
.
..
..
...
..
...........
22
Nm
(16
ft-Ib)
19
.
Disconnect
wiring
from
starter
and
alternator
.
Move
`
"
Radiator
cooling
fan
to
coolant
pump40
Nm
(30
ft-Ib)
wiring
harness
out
of
way
.
See
121
Battery,
Starter,
"
Radiator
drain
screw
to
radiator
...
2
.5
Nm
(22
in-lb)
Alternator
.
"
Wiring
to
alternator
(M8
nut)
........
12
Nm
(9
ft-1b)
"
Wiring
to
starter
20
.
Remove
oil
dipstick
guide
tube
.
Note
O-ring
at
base
of
M6
nut
..
.
..
..
...
..
...........
.
:5
Nm
(44
in-lb)
tube
when
removing
.
M8
nut
..
.
..
..
...
..
............
12
Nm
(9
ft-Ib)
ENGINE
REMOVAL
AND
INSTALLATION
Page 63 of 759
11
.
Draín
engine
coolant
and
Rmove
coolant
hoses
at-
tached
to
cylinder
head
.
"
Drain
engine
block
byremoving
block
drain
.
"
Disconnect
hoses
from
thermostat
housing
in
front
of
cylinder
head
.
"
Disconnect
heater
hoses
at
rear
of
engine
.
See
Fig
.
9
.
"
Drain
radiator
by
removingthreaded
plastic
plug
from
lower
left
comer
.
NOTE-
"
The
block
drain
plug
is
located
oh
the
exhaust
side
to-
wards
rear
ofengine
.
"
Remove
small
plastic
lock
clipto
pulíradiator
draín
plug
out
completely
.
NOTE-
CAUTION-
Radiatorfan
has
left
hand
threads
.
ENGINE
REMOVAL
AND
INSTALLATION
110-
5
Fig
.
9
.
Coolant
hoses
at
heater
valve
and
heater
core
to
be
discon-
nected
(arrows)
.
12
.
Remove
radiator
cooling
fan
and
radiator
as
described
in
170
Radiator
and
Cooling
System
.
13
.
Label
and
disconnectcoolant
hoses,
cables,
and
har-
ness
connectors
from
throttle
housing
.
See
Fig
.
10
.
14
.
Working
atrearof
intake
manifold,
label
and
then
re-
move
fuel
supply
and
fuel
retum
lines
.
Disconnect
fuel
lines
from
support
bracket
on
manifold
.
See
Fig
.
11
.
uu12ivu
Fig
.
10
.
Throttle
housing
assemblyon
M52
engine
.
Disconnect
hos-
es,
cables
and
harness
connectors
at
and
around
housing
.
0012699
Fig
.
11
.
Special
fuelline
fitting
at
fuel
rail
on
M52/S52US
engine
.
Use
BMW
special
tool
16
1
050
to
releaselocking
fittings
at
ends
offuel
lines
.
WARNING
-
"
Fuel
may
be
expelled
under
pressure
.
Do
not
smoke
or
work
near
heaters
or
other
fire
haz-ards
.
Keep
a
fire
extinguísher
handy
.
Before
dis-
connecting
fuel
hoses,
wrapa
cloth
around
fuel
hoses
to
absorb
any
leaking
fuel
.
Plug
all
oyen
fuel
fines
.
"
Always
unscrew
the
fuel
tank
cap
to
release
pres-
sure
ín
the
tank
before
working
on
the
tank
or
lines
.
OnM52
and
S52US
engines,
special
fittings
are
used
to
retain
the
fuel
lines
to
the
fuel
rail
.
Use
BMW
special
16
.
Remove
intake
manifold
from
engine
byremoving
sev-
tool
no
.
161050
to
compress
the
locking
clip
insidethe
en
mounting
nuts
from
above
andtwo
mounting
bracket
end
of
the
fuel
line
fittings
to
release
the
fine
.
boits
from
below
.
See
Fig
.
12
.
15
.
Unbolt
power
steering
fluid
reservoir
from
its
mounting
CAllTION-
bracket
.
Use
stiff
wire
to
hang
reservoir
to
one
side
.
Do
Stuff
clean
rags
into
the
open
intake
ports
to
pre-
not
disconnect
fluid
fines
.
vent
any
parts
from
falling
into
the
engine
intake
.
ENGINE
REMOVAL
AND
INSTALLATION
Page 65 of 759
22
.
Move
A/C
compressor
out
of
the
way
without
distorting
26
.
Carefully
raise
engine
out
ofcar,
checking
for
any
wir-
or
damaging
any
lines
.
Support
compressor
by
hanging
ing,fuel
lines,
or
mechanical
parts
that
might
become
it
from
chassis
using
stiff
wire
.
snagged
as
engine
is
removed
.
23
.
Disconnect
wiring
from
starter
and
alternator
.
Move
27
.
Installation
is
reverse
of
removal,
noting
the
following
:
wiring
harness
out
of
the
way
.
See
121
Battery,
Start-
Replace
al¡
gaskets,
O-rings
and
seals
.
er,
Alternator
.
"
Change
engine
oil
and
filter
and
check
all
other
fluid
24
.
Remove
Fontexhaust
pipe
fromexhaust
manifold
.
See
levels
.
See
020
Maintenance
Program
.
"
Refill
and
bleed
cooling
system
.
See
170
Radiator
Fig
.
16
.
and
Cooling
System
.
"
Check
that
engine
drivebelts
properly
engage
the
pul-
ley
grooves
.
"
Install
the
Font
exhaust
pipesusing
new
gaskets
and
seif-locking
nuts
.
Use
copper
paste
on
threads
.
See
180
Exhaust
System
.
0012525
Fig
.
16
.
Front
exhaust
pipeto
exhaust
manifolds
mounting
nuts
on
6-
cylinder
engine
(arrows)
.
25
.
Install
an
engine
lifting
device
and
raise
engine
until
its
weight
is
supported
.
Remove
nuts
and
ground
strap
from
left
and
right
engine
mounts
.
ENGINE
REMOVAL
AND
INSTALLATION
110-
7
Tightening
Torques
"
Coolant
drain
plug
to
cylinder
block
.
25
Nm
(18
ft-Ib)
"
Engine
mount
to
subframe
M10
..
.
.
.
...
..............
..
.
45
Nm
(33
ft-Ib)
M8
..
..
.
..
................
...
22
Nm
(16
ft-Ib)
"
Intake
manifold
to
cylinder
head
M7
..
..
..
...
................
.
15
Nm
(11
ft-Ib)
M8
...
.
..
...
................
.
22
Nm
(16
ft-Ib)
"
Radiator
cooling
fan
to
coolant
pump40
Nm
(30
ft-Ib)
"
Radiator
drain
screw
to
radíator
...
2
.5
Nm
(22
in-lb)
"
Wiring
to
alternator
(M8
nut)
........
12
Nm
(9
ft-Ib)
"
Wiring
to
starter
M6
nut
.
..
...
..................
5
Nm
(44
in-lb)
M8
nut
.....
..
.
.
.
.
.............
12
Nm
(9
ft-Ib)
ENGINE
REMOVAL
AND
INSTALLATION