1997 BMW 328i Timing Cover
[x] Cancel search: Timing CoverPage 112 of 759
117-
1
6
CAMSHAFT
TIMING
CHAIN
15
.
Remove
crankshaft
locking
tool
.
Remove
special
test
equipment
.
Insta¡¡
oil
supply
line
using
new
seals
and
reconnect
solenoid
connector
.
Remainder
of
installa-
tion
is
reverse
of
removal
.
Tightening
Torque
"
Cylinder
head
cover
to
cylinder
head
.
10
Nm
(89
in-lb)
"
VANOS
oil
supply
line
to
VANOS
control
unit
(banjo
bolt)
..
.........
32
Nm
(24
ft-Ib)
"
VANOS
solenoidlo
VANOS
control
unit
........
.
.
.
..
........
30
Nm
(22
ft-Ib)
VANOS
control
unit,
removing
Special
BMW
service
tools
are
required
lo
remove
and
in-
stall
the
VANOS
control
unit
.
Read
the
procedure
through
be-
forestarting
the
job
.
1
.
Remove
radiator
cooling
fan
shroud
and
cooling
fan
.
See
170
Radiator
and
Cooling
System
.
CAUTION-
Radiator
fan
has
left
hand
threads
.
2
.
Remove
top
plastic
engine
covers
.
Disconnect
ignition
coil
harness
connectors
from
coils
.
Remove
ignition
coils
.
Remove
cylinder
head
cover
.
Unclip
andremove
oil
baffle
cover
from
above
intake
camshaft
.See
113
Cylinder
Head
Removal
and
Installation
.
NOTE-
Make
note
of
the
mounting
bolt
insulator
arrangement
during
removal
of
the
cylinder
head
cover
.
3
.
Set
engine
lo
TDC
by
rotating
engine
in
normal
operat-
ing
direction
until
camshaft
lobes
at
cylinder
no
.
1
are
facing
each
other
and
"0/T"
mark
(0°TDC)
on
vibration
damper
lines
up
with
cast
boss
on
lower
timing
chain
cover
.
See
Fig
.
38
.
4
.
Lock
crankshaft
at
TDC
by
inserting
BMW
special
tool
no
.
11
2
300
through
transmission
bellhousing
and
finto
flywheel
or
drive
plate
.
Refer
to
Fig
.
36
given
earlier
.
NOTE-
Confirm
that
the
locking
tool
has
been
correctly
in-
stalled
by
trying
to
rotatethe
crankshaft
.
5
.
Remove
three
cylinder
head
cover
mounting
studs
from
rear
of
head
.
Lockcamshafts
at
TDC
bymounting
BMW
special
tool
no
.
11
3
240
at
ends
of
camshafts
.
Check
that
tool
is
squarely
seated
on
cylinder
head
gasket
surface
.
If
necessary,
rotate
camshafts
slightly
using
a24
mm
wrench
.
Refer
to
Fig
.
24
given
earlier
.
VANOS
(VARIABLE
VALVE
TIMING)
Fig
.
38
.
Camshafts
positioned
at
TDC-Cyl
.
No
.
1
cam
lobes
face
in
Note
0/T
mark
(0°TDC)
on
vibration
damper
alígned
with
boss
on
front
cover
.
CA
UTION-
Thecamshafts
mustbe
locked
in
the
TDC
position
using
the
specialservice
tool
or
an
equivalent
be-
fore
removing
the
timing
chain
.
Thearrows
on
the
sprockets
should
not
be
used
to
accurately
set
the
engine
to
TDC
The
special
tool
holds
the
cam-
shafts
parallel
to
each
other
and
perpendicular
to
the
valve
cover
gasket
surface
.
6
.
Disconnect
harness
connector
and
oil
line
fitting
from
bottom
of
VANOS
control
unit
.
NOTE-
Wrap
the
VANOS
oilfine
fitting
with
a
shop
rag
to
ab-
sorb
leaking
oil
.
7
.
Remove
two
access
plugs
from
VANOS
control
unit
in
frontof
exhaustcamshaft
sprocket
.
Loosen
4exhaustcamshaft
sprocket
mounting
bolts
but
do
not
remove
(Torx
El
0
socket)
.
NOTE-
Removal
of
the
access
plugs
allows
the
lower
exhaust
camshaft
sprocket
mounting
bolts
to
be
accessed
.
8
.
Depress
secondary
timing
chain
tensioner
and
lock
it
in
down
position
by
inserting
a
stiff
wire
into
rear
of
ten-
sioner
.
See
Fig
.
27
.
9
.
Remove
VANOS
control
unít
mounting
nuts
and
boltat
front
of
cylinder
head
.
Page 114 of 759
117-
1
8
CAMSHAFT
TIMING
CHAIN
CAUTION-
It
is
crítical
that
the
exhaustcamshaft
sprocket
be
turned
only
the
mínimum
amount
necessary
to
engage
the
gear
cup
.
If
this
procedure
is
done
ín-
correctly,
the
VANOS
system
may
not
function
throughout
íts
full
range
.
NOTE-
As
the
control
unit
isinstalled,
the
secondary
sprockets
will
rotate
in
the
counterclockwise
direction
.
It
may
be
necessary
to
guide
sprockets
counterclockwise
as
the
control
unit
is
installed
.
8
.
On
cars
built
from3/95
:
Use
a
spanner
tool
(See
Fig
.
39
.),
turn
exhaust
sprocket
counterclockwise
(as
víewed
from
front
of
engine)
only
enough
to
mesh
gear
cup
splines
with
camshaftgear
.
Slowly
push
VANOS
control
unit
towards
camshaft
until
it
is
fully
seated,guiding
chains
in
counterclockwise
direction
.
CA
UTION-
Ensure
that
the
first
available
tooth
engages
.
9
.
Install
and
tightencontrol
unit
nuts
and
bolt
.
10
.
Connect
harness
connector
to
VANOS
solenoid
.
Using
new
seals,
insta¡¡
oil
line
fitting
.
Tightening
Torques
"
VANOS
control
unitto
cylinder
head
M6
nut
.....
..
..
.
.
.............
10
Nm
(89
in-lb)
M8
bolt
.....
.
.
.
.
..
.............
22
Nm
(17
ft-Ib)
"
VANOS
oil
supply
line
to
control
unit
.
32
Nm
(24
ft-Ib)
11
.
Slowlyunlock
and
release
secondary
chain
tensioner
.
12
.
Preloadprimary
chain
by
tightening
BMW
special
tool
no
.
112
240
(dummy
chain
tensioner)
to
1
.3
Nm
(11
in-
lb)
.
Then
tighten
exhaust
camshaft
sprocket
mounting
bolts
alternately
in
two
stages
.
Tightening
Torque
"
Secondarytiming
chain
sprockets
to
camshafts
(Tora
boits)
Stage
1
..
...............
...
.
.
...
5
Nm
(44
in-lb)
Stage
2
..
...............
...
.
.
..
22
Nm
(17
ft-Ib)
VANOS
(VARIABLE
VALVE
TIMING)
13
.
Remove
flywheel
locking
tool
from
transmission
bell-
housing
.
Remove
camshaft
locking
tool
from
rear
of
cylinder
head
.
14
.
Turn
engine
over
by
hand
at
least
two
fui¡
crankshaft
ro-
tations
.
Reinstall
camshaft
locking
tool
and
flywheel
locking
toolto
make
sure
all
adjustments
are
correct
.
If
settings
are
correct,
remove
locking
tools
.
15
.
Remove
BMW
special
tool
112
420
(dummy
chain
ten-
sioner)
from
side
of
cylinder
head
.
Install
primary
chain
tensioner
so
that
cutout
in
tensioner
piston
engages
chain
rail
.
See
Fig
.
34
.
Using
new
seals,
install
and
tighten
access
plugs
in
VANOS
control
unit
.
Tightening
Torque
"
Access
plugs
to
VANOS
control
unit
.
..
.
.....
.
..
...
50
Nm
(37
ft-lb)
"
Primary
timing
chain
tensioner
plug
to
tensioner
sleeve
M50/S50USengine
.
.
..
.
.
...
.
...
..
50
Nm
(37
ft-Ib)
M52/S52US
engine
...
..
...
...
...
40
Nm
(30
ft-Ib)
16
.
Install
oil
baffle
cover
above
intake
camshaft
.
Install
three
cylinder
head
covermounting
studs
to
rear
of
head
.
Instali
cylinder
head
cover
.
Tightening
Torque
"
Cylinder
head
cover
to
cylinder
head
(M6
screws)
......
10
Nm
(89
in-Ib)
17
.
Installationof
remaining
parts
is
reverse
of
removal
.
NOTE-
Be
sure
to
install
the
ground
wíres
at
the
cylinder
head
cover
mounting
studs
and
at
the
front
of
the
cylinder
head,
if
applicable
.
Page 118 of 759
119-
4
LUBRICATION
SYSTEM
15
.
Remove
oil
pan
screws
.
Lower
andremove
oil
pan
to-
ward
rear
.
Tightening
Torques
"
Control
arm
bushing
carrier
CAUTION-
to
body(M10
bolt)
...............
42
Nm
(31
ft-Ib)
'
lf
the
oil
pan
does
not
separate
easily
from
the
en-
"
Engine
mount
to
gine
cylinder
block,
make
sure
all
mounting
bolis
suspension
crossmember
(M10
nut)
.
42
Nm
(31
ft-Ib)
have
been
removed
.
If
necessary,
a
few
tapswith
"
Front
suspension
crossmember
a
rubber
mallet
shouldbreak
it
free
.
Never
pry
the
to
body
.
.
..
...
..
.
....
See
310
Front
SusPension
oil
pan
loose
.
"
Oil
pan
to
engine
block
(M6
bolt)
8
.8
grade
..
....
.
...
...
.
........
10
Nm
(89
in-lb)
16
.
Installation
is
reverse
of
removal
.
10
.9
grade
...
..
.
....
..
.
.
.
.......
12
Nm
(9
ft-Ib)
"
Thoroughly
clean
all
old
gasket
material
from
mating
"
Power
steering
pump
to
bracket
surfaces
anduse
a
new
gasket
.
(self-locking
nuts)
....
..
.
....
..
.
..
22
Nm
(16
ft-Ib)
"
Applya
small
amount
of
non-hardening
sealer
(3-
"
Power
steering
pump
bracket
to
engine
Bond
O
l209
or
equivalent)
to
oil
pan
gasket
directly
block
or
oil
pan
(self-locking
nuts)
..
.
22
Nm
(16
ft-Ib)
below
joints
for
end
cover
and
front
timing
case
cover
.
"
Stabilizer
bar
link
to
control
arm
See
Fig
.
5
.
M8
nut
.................
...
.
...
22
Nm
(17
ft-Ib)
"
When
installing
oil
pan
to
engine,
tighten
forward
M10
nut
.....................
..
42
Nm
(31
Ib-ft)
screws
first,
then
tightenrear
.
"
Steering
column
universal
joint
"
Fill
engine
with
oil
as
described
in
020
Maintenance
to
steering
rack
spindle
(M8
bolt)
....
19
Nm
(14
ft-ib)
Program
.
0011950
Fig
.
5
.
Joint-mating
areas
at
oil
pan
gasket
where
sealer
should
be
applied
(arrows)
.
Apply
a
bead
3
mm
wideby
2
mm
high
.
OIL
PAN
WARNING
-
Always
use
new
bolis
when
mounting
the
subframe
to
the
body
.
The
one-timeonly
bolis
shouldbe
re-
placed
any
timethey
are
removed
.
NOTE-
The
oil
pickup
is
attached
to
the
oil
pan
using
self-tap-
ping
screws
.
For
this
reasonno
threading
for
the
pickup
is
present
on
new
oil
pans
.
Replace
the
seal
for
the
pickup
and
use
the
oíd
screws
to
rea
ttach
the
pickup
to
the
pan
.
Oil
pan,
removing
and
installing
(6-cylinder
engine,
1992models)
NOTE-
Cars
built
up
to
9/92
(1992models)usea
different
sus-
pension
crossmember
than
later
production
cars
.
Oil
pan
removalprocedureon
the
earlier
cars
requires
that
the
engine
be
raised
and
supportedfrom
above
.
1
.
Raise
car
and
place
securely
on
jackstands
.
2
.
Remove
splash
shield(s)
from
under
engine,
where
ap-
plicable
.
3
.
Drain
engine
oil
as
described
in
020
Maintenance
Pro-
gram
.
4
.
Remove
complete
exhaust
system
.
See180
Exhaust
System
.
5
.
Remove
air
filter
housing
complete
with
mass
air
flow
sensor
.
See
113
Cylinder
Head
Removal
and
Instal-
lation
.
6
.
Remove
alternator
cooling
duct
from
alternator
and
ra-
diator
support
.
7
.
Remove
radiator
cooling
fan
and
fan
shroud
.
Remove
radiator
securing
clips
at
top
of
radiator
.
See
170
Radi-
ator
and
Cooling
System
.
Center
the
steering
spindle
to
the
steering
rack
before
in-
NOTE-
stalling
the
steering
column
shaft
.
See
320
Steering
and
The
radiator
cooling
fan
nut(32
mm
wrench)
has
left
Wheel
Alignment
for
specific
installation
markings
and
pro-
hand
threads
.
cedures
.
Page 122 of 759
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
.
Page 123 of 759
7
.
Unbolt
timing
chain
casefrom
frontof
engine
.
See
Fig
.
13
.
9
.
Installation
is
reverse
of
removal
.
Fig
.
13
.
Timing
chain
case
mounting
bolts
(arrows)
on
M44
engine
.
8
.
Remove
cover
from
oil
pump
on
rear
of
timing
chain
case
.
See
Fig
.
14
.
Inspect
oil
pump
gears
and
oil
pump
cavity
in
timing
chain
case
for
wear
andlor
scoring
.
Fig
.
14
.
Oil
pump
cover
mounting
bolts
(arrows)
on
M44
engine
.
LUBRICATION
SYSTEM
119-
9
"
Replace
al¡
gaskets
and
O-rings
.
"
Install
a
new
rubber
sea¡
(profile
gasket)
between
top
of
timing
chain
case
and
cylinder
head
.
"
Be
sure
to
thoroughly
clean
sealing
surfaces
.
-Use
3-Bond
1209
orequivalent
sealant
on
both
sides
of
sea¡
before
installing
.
10
.
Protect
profile
gasket
using
thin
sheet
metal
(BMW
special
tool
no
.
11
2
330)
when
installing
timing
chain
case
.
See
Fig
.
15
.
"
Applya
thin
coating
of
grease
to
both
sides
of
sheet
metal
tool
and
to
top
surface
of
profile
gasket
.
"
Placesheet
metal
between
gasket
and
cylinder
head
and
carefully
slíde
upper
chain
cover
into
position
.
"
Tighten
al¡
mounting
bolts
and
then
carefully
withdraw
sheet
metal
.
Install
timing
chain
as
described
in
117
Camshaft
Timing
Chain
.
Fig
.
15
.
Use
thin
sheetmetal
(arrow)
toprotect
profile
gasket
during
installation
of
timing
chain
case
.
Carefully
withdraw
sheetmetal
after
tightening
fasteners
.
Tightening
Torques
"
Timing
chain
case
to
engine
block
M6
..
.
...
...
.
..
.............
.
.10
Nm
(7
.5
ft-Ib)
M8
........
.
..
..
..............
22
Nm
(16
ft-Ib)
"
Thermostathousing
to
upper
timing
chain
cover(M6)
............
10
Nm
(89
in-lb)
"
OH
filter
cover
to
oil
filter
housing
(M8)
.
.
.........
25
Nm
(18
ft-lb)
"
Oil
pump
cover
to
timing
chain
case
(M6)
...
..
.......
10
Nm
(89
in-lb)
"
Oil
pan
to
engine
block
(M6
bolt)
8
.8
grade
.........
.
.
..
.........
10
Nm
(89
in-lb)
10
.9
grade
............
.
.......
12
Nm
(106
in-lb)
"
Alternator
to
alternator
bracket
.....
43
Nm
(32
ft-Ib)
OIL
PUMP
Page 125 of 759
GENERAL
.
........
.
...........
.
.
.
.
.
.
.
120-1
Camshaft
Position
(CMP)
Sensor
....
.
.
.
...
120-6
Disabling
Ignition
System
.
.
.
.
.....
.
.
.
.
.
.
.
120-2
Camshaft
position
(CMP)
sensor,
replacing
Warnings
and
Cautions
.
.
.
.
.
.
.....
.
.
.
.
.
.
.
120-2
(4-cylinder
engine)
..
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
...
120-6
Camshaft
position
(CMP)
sensor,
replacing
IGNITION
SYSTEM
DIAGNOSTICS
.
.
.
.
.
.
120-3
(6-cylinder
engine)
..
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
120-7
Basic
Troubleshooting
Principles
...
.
.
.
.
.
.
.
120-3
Knock
sensors,
replacing
.
.
...
.
.
.
.
.
.
.
.
.
.
.
.
120-7
Ignition
Firing
Order
.....
.
...
.
.
.
.....
.
.
.
.120-7
IGNITION
SYSTEM
SERVICE
.
.........
.
120-3
Checking
for
Spark
..
.
.
.
.
.
.
.
.
.
.......
.
.
.
120-3
Ignition
coil,
testing
and
replacing
(4-cylinder
engine)
.
.
.
.
.
.
.
.
.
.
.........
.
120-3
Ignition
coil,
testing
and
replacing
(6-cylinder
engine)
.........
.
..........
120-4
Crankshaft
Positionlrpm
Sensor
.......
.
...
120-5
Crankshaft
position/rpm
sensor,
testing
and
replacing
(front
mounted)
.........
.
.
.
.
.
.
120-6
Crankshaft
position/rpm
sensor,replacing
(rear
mounted)
.....
.
.....
.
.....
.
.
.
.
.
.
120-6
GENERAL
Troubleshooting
and
testing
of
the
engine
management
system
should
be
carried
out
using
the
BMW
specialized
ser
This
repair
group
covers
repair
andcomponent
replace-
vice
tester
(scan
tool)
.
ment
information
for
the
ignition
system
.
All
engines
use
a
distributorless
ignition
system
with
indívid-
ual
ignitioncoils
for
each
cylinder
.
There
is
no
distributor
cap
NOTE-
or
ignition
rotor
.
Each
coil
can
be
selectively
controlled
by
the
"
Spark
plug
replacement
is
covered
in
020
Mainte-
engine
control
module
on
a
cylinder-by-cylinder
basis
.
On
later
nance
Program
.
systems,
knock
sensors
are
used
to
monitor
and
control
igni-
"
For
fuel
related
troubleshooting
and
testing,
see
130
tion
knock
(ping)
and
adjusttiming
accordingly
.
Fuel
lnjection
.
Ignition
timing
is
electronically
controlled
and
not
adjust-
All
engines
covered
by
this
manual
use
an
advanced
en-
able
.
The
engine
control
module
(ECM)
usesengine
load,
en-
gine
management
system
.
The
engine
management
system
gine
speed,
coolant
temperature,
and
intake
air
temperature
incorporates
on-board
diagnostics,
fuel
injection,
ignition
and
as
the
basic
inputs
for
timing
control
.
Knock
detection
is
also
other
advanced
engine
control
functions
.
an
input
to
the
control
module,
where
applicable
.
Table
a
.
Engine
Management
System
Variants
Engine
code
1
System
4-cylinder
M42
(1.8
I)
Bosch
DME
Ml
.7
M44
(1
.9
I)
Bosch
DME
M5
.2
(OBD
II)
6-cylinder
M50
1992
(2.5
I)
Bosch
DME
M8
.1
1993-1995
(2
.5
I)
Bosch
DME
M33
.1
M52
1996-1998
(2.8
I)
Siemens
MS
41
.1
(OBD
II)
1998
(2
.5
I)
Siemens
MS
41
.1
(013D
11)
S50US
(3.0
I)
Bosch
DME
M3
.3.1
S52US
(3.2
I)
Siemens
MS
41
.1
(OBD
II)
120
Ignition
System
IGNITION
SYSTEM
120-1
IGNITION
SYSTEM
SCHEMATICS
...
.
.
.
.120-7
TABLES
a
.
Engine
Management
System
Variants
......
120-1
b
.
Ignition
Coil
Resistance
(M42
engine)
......
120-4
c
.
Ignition
Coil
Resistance
(M44
engine)
......
120-4
d
.
Ignition
Coil
Resistance
(6-cylinder
engine)
..
.
.
.
.
.
.
.
.
.
.
.
.....
.
..
120-5
NOTE-
All
engines
coveredby
this
manual,
with
theexception
of
the
1992
M50,
incorporate
knocksensors
as
part
of
the
engine
management
system
.
The
initial
ignition
point
is
determined
by
the
crankshaft
po-
sition/rpm
sensor
during
cranking
.
Once
the
engine
is
run-
ning,
timing
is
continually
adjusted
based
on
operating
conditions
.
A
characteristic
ignition
map
is
shown
in
Fig
.
1
.
A
map
similar
to
the
one
shown
is
digitally
stored
in
the
engine
control
module
.
GENERAL
Page 130 of 759
120-
6
IGNITION
SYSTEM
Crankshaft
position/rpm
sensor,
testing
and
replacing
(front
mounted)
1
.
Disconnect
sensor
harness
connector
.
2
.
Using
a
digital
multimeter,
check
resistance
between
terminals
1
and
2
in
connector
.
See
Fig
.
10
.
n1
n2n3
Fig
.
10
.
Crankshaft
position/rpm
sensorconnector
.
Crankshaft
positionlrpm
sensor
specifications
"
Coil
resistance
(approx
.)
terminais
1
and
2
....
.
..
...
....
1280
±
10%
ohms
"
Air
gap
(sensor
distance
from
toothed
wheel)
..
.
.
........
.1
.0
±
0
.3
mm
(0
.04
±
0
.01
in
.)
3
.
If
the
resistance
is
not
correct,
the
sensor
is
faulty
and
should
be
replaced
.
NOTE
-
When
installing
the
new
sensor,
be
sure
thewiring
Is
rerouted
in
the
same
orientation
.
Secure
the
sensor
us-
ing
new
wire
ties
.
Tightening
Torque
"
Crankshaft
position/rpm
sensor
to
mounting
bracket
.........
.
.
5
t
1
Nm
(62
t
9
in-lb)
Crankshaft
position/rpm
sensor,
4
.
Installation
is
reverse
of
removal
.
Use
a
new
O-ring
replacing
(rear
mounted)
when
installing
sensor
.
Be
sure
wiring
is
rerouted
in
same
orientation
.
1
.
Disconnect
sensor
harness
connector
.
6502AGN56
2
.
Locatesensor
on
rear
left
sideof
cylinder
block
.
Re-
move
sensormounting
bolt
and
remove
sensorfrom
cylinder
block
.
IGNITION
SYSTEM
SERVICE
3
.
Installation
is
reverse
of
removal
.
Use
a
new
O-ring
when
installing
sensor
.
Be
sure
wiring
is
rerouted
in
same
orientation
.
Secure
sensor
using
new
wire
ties
.
NOTE-
It
may
be
easier
to
remove
the
sensor
working
from
the
underside
of
the
vehicle
.
Camshaft
Position
(CMP)
Sensor
The
camshaft
position
(CMP)
sensor
is
usedby
the
engine
management
system
for
sequential
fuel
injection
and
knock
control
.
Camshaft
position
(CMP)
sensor,
replacing
(4-cylinder
engine)
1
.
Remove
CMP
sensorfromtop
timing
cover,
just
above
coolantthermostat
housing
.
See
Fig
.
11
.
Fig
.
11
.
Camshaft
position
sensor
mounting
bolt
(arrow)
.
M42
engine
shown
.
2
.
On
M42
engines
to
9/93
:
Disconnect
CMP
harness
plug
just
above
oil
filter
housing
.
3
.
On
M42
from9/93
and
all
M44
engines
:
Remove
upper
intake
manifold
as
described
in
113
Cylinder
Head
Re-
moval
and
Installation
.
Then
unplug
CMP
sensor
har-
ness
connector
below
manifold
.
Page 131 of 759
Camshaft
position
(CMP)
sensor,
replacing
(6-cylinder
engine)
1
.
Remove
plastic
cover
from
above
fuel
injectors
.
2
.
Disconnect
harness
connector
from
VANOS
solenoid
and
unscrew
solenoid
from
VANOS
control
unit
.
Re-
"
Clean
contactsurface
on
engine
block
before
fnstall
move
oil
supply
line
from
VANOS
control
unit
.
See
117
ing
knock
sensors
.
Camshaft
Timing
Chain
.
3
.
Remove
camshaft
position
(CMP)
sensor
from
left
frontof
cylinder
head,
next
to
top
of
oil
filter
housing
.
"
Knock
sensor
to
cylinder
block
....
20
Nm
(15
ft
.
lbs
.)
4
.
Disconnect
CMP
sensor
harnessfrom
under
intake
manifold
.
5
.
Installation
is
reverse
of
removal
.
Use
a
new
O-ring
when
installing
sensor
.
Be
sure
wiring
is
rerouted
in
same
orientation
.
Tightening
Torques
"
CMP
sensor
to
cylinder
head
....
.
.
..
5
Nm
(3
.5
ft-Ib)
"
VANOS
oil
supply
pipe
to
VANOS
control
unit
...........
.
..
32
Nm
(24
ft-Ib)
"
VANOS
solenoid
to
VANOS
control
unit
...
.
.................
30
Nm
(22
ft-Ib)
Knock
sensors,
replacing
Knock
sensors
are
usedon
engines
with
Bosch
DME
M1
.7,
Bosch
DME
M3
.3
.1,
Bosch
DME
M5
.2,
and
Siemens
MS
41
.1
engine
management
systems
.
The
knocksensors
are
bolted
to
the
left
sideof
the
cylinder
block
and
monitor
the
combus-
tion
chamber
for
engine-damaging
knock
.
If
engine
knock
is
detected,
the
ignition
point
is
retarded
accordingly
via
the
en-
gine
control
module
.
CA
UTION-
"
Label
knock
sensorharness
connectors
before
disconnecting
them
.
The
connectors
must
not
be
interchanged
.
Engine
damage
may
result
if
the
sensors
are
monitoring
the
wrong
cytinders
.
"
Note
the
installed
angle
of
the
knock
sensoron
the
block
before
removing
it
.
Reinstall
the
sensor
in
the
same
position
.
Be
sure
to
usea
torque
wrench
when
tightening
the
sensormounting
bola
NOTE
-
"
On
M52
engines,
a
single
harness
connects
the
twosensors
to
the
main
harness
connector
.
The
shorter
cable
lead
fs
for
the
knock
sensor
for
cytinders
4,
5,
and
6
.
Tightening
Torque
IGNITION
SYSTEM
120-
7
0012730
Fig
.
12
.
Knock
sensor
mounting
bolt
on
front
left
side
of
cylinder
block
.
NOTE-
Knock
sensor
function
Is
monitoredby
the
On-Board
Diagnostic
system
.
If
a
knock
sensor
is
detected
to
be
faulty,
an
appropriatediagnostic
trouble
code
(DTC)
may
be
stored
in
memory
.
See
100
Engine-General
for
information
on
retrieving
DTCs
.
On
6-cylinder
engines,
the
knock
sensors
are
accessible
af-
ter
removing
the
intake
manifold
.
On
4-cylinder
engines,
the
upper
section
of
the
intake
manifold
should
be
removed
to
ac-
cess
the
sensors
.
See
Fig
.
12
.
NOTE-
Intakemanifold
removal
and
installation
procedures
are
"
Cylinder
no
.
1is
at
the
front
of
the
engine
.
covered
in
113
Cylinder
HeadRemoval
and
Installation
.
Ignition
Firing
Order
Ignition
Firing
Order
"
4-cylinder
engines
.....
..
...
.
..........
.1-3-4-2
"
6-cylinder
engines
...........
..
.
.
..
..
1-5-3-6-2-4
IGNITION
SYSTEM
SCHEMATICS
Fig
.
13
through
Fig
.
17
show
ignition
system
schematics
usedon
the
enginescoveredby
this
manual
.
IGNITION
SYSTEM
SCHEMATICS