wire BMW 318i 1997 E36 Owner's Manual
[x] Cancel search | Manufacturer: BMW, Model Year: 1997, Model line: 318i, Model: BMW 318i 1997 E36Pages: 759
Page 78 of 759
113-12
CYLINDER
HEAD
REMOVAL
AND
INSTALLATION
18
.
Working
from
underside
of
intake
manifold,
disconnect
21
.
Detach
oil
dipstick
guide
tube
from
manifold
.
Disconharness
connectors,
vent
hoses,
and
air
bypass
nectvent
hose
at
base
of
dipstick
.
hoses)
.
22
.
Remove
intake
manifold
from
engine
byremoving
sev-19
.
Working
at
rear
of
intake
manifold,
label
and
disconnect
en
mounting
nuts
from
above
andtwo
support
bracket
fuel
supply
and
fuel
return
lines
.
Remove
fuelline
hold
bolts
from
below
.
See
Fig
.
32
.
down
bracket
to
free
lines
.
See
Fig
.
31
.
NOTE-
On
M52IS52US
engines,
a
special
fitting
is
used
to
re-tain
the
fuel
fines
to
the
fuel
rail
.
Use
BMW
special
tool
no
.
16
1
050
to
expand
the
locking
clip
inside
the
end
of
the
fuellíne
fittings
.
WARNING
-
"
The
fuel
system
is
desígned
to
retan
pressure
even
wheh
the
ignition
is
off
.
When
working
with
the
fuel
system,
loosen
the
fuel
lines
slowly
toal-
low
residual
fuel
pressure
to
dissipate
gradually
.
Avoid
spraying
fuel
.
"
Fuel
is
highly
flammable
.
When
working
around
fuel,
do
not
disconnect
any
wires
that
could
cause
electrfcal
sparks
.
Do
not
smoke
orwork
near
heaters
or
other
fire
hazards
.
"
Always
unscrew
the
fuel
tank
cap
to
release
pres-
sure
in
the
tank
before
working
on
the
tank
or
lines
.
20
.
Remove
mountingscrews
and
release
wiring
harness
duct
at
rear
bulkhead
and
move
aside
.
Remove
wiring
harness
brackets
frombulkhead
.
CYLINDER
HEAD,
6-CYLINDER
Fig
.
32
.
Intake
manifoldnuts
and
support
bracket
bolts
(arrows)
.
CAUTION-
Stuff
clean
rags
into
the
open
intake
ports
topre-
001269s
vent
any
ports
from
falfing
into
the
engine
.
Fig
.
31
.
Fuel
lines
at
intake
manifold
on
M52/S52
engine
.
Use
BMW
special
tool
16
1
050
to
release
locking
fittings
at
ends
of
fuel
enes
.
1
Timing
chains,
uncoupling
23
.
Remove
VANOS
unit
from
frontof
cylinder
head
.
See
VANOS
section
in
117
Camshaft
Timing
Chain
.
24
.
Setengine
to
approximate
TDC
by
rotating
in
normal
operating
direction
until
camshaft
lobes
at
cylinder
no
.
1
are
facing
each
other
.
Arrows
on
camshaft
sprockets
should
be
pointing
up
.
NOTE-
To
confirm
that
the
crankshaft
is
set
to
the
TDC
posi-
tion,
check
that
the
OIT
mark
(0°
TDC)on
the
front
low-
er
timing
chain
cover
ís
aligned
with
the
víbration
damperSee
Fig
.
33
.
25
.
Lock
crankshaft
at
TDC
.
"
Insert
BMW
special
tool
no
.
11
2
300
through
transmis-
sion
bellhousing
and
finto
hole
in
flywheelor
drive
plate
.
See
Fig
.
34
.
Page 79 of 759
Fig
.
33
.
Crankshaft
is
positioned
at
TDC
when
notch
oh
front
timing
chain
cover
is
alignedwith
0/T
mark
on
víbration
damper
.
CYLINDER
HEAD
REMOVAL
AND
INSTALLATION
113-
1
3
Fig
.
35
.
Camshaft
locking
tool
(BMW
special
tool
no
.
11
3
240)
in-
stalled
on
rear
of
camshafts
.
(M44
engine
shown
.
Other
en-
gines
are
similar
.)
CAUTION-
The
camshafts
must
be
locked
in
the
TDC
position
using
the
special
service
tool
before
removing
the
timing
chain
.
Thearrowson
the
sprockets
should
not
be
used
to
accurately
set
the
engine
to
TDC
.
The
tool
holds
the
camshafts
parallel
to
each
oth-
er
and
perpendicular
to
the
cylinder
head
covergasket
surface
.
27
.
Depress
secondary
timing
chain
tensioner
and
lock
t
down
by
inserting
BMW
special
tool
no
.
113
292
.
Alter-
natively,
a
stiff
piece
of
wire
can
be
used
.
See
Fig
.,36
.
Fig
.
34
.
Crankshaft
locking
tool
(BMW
special
tool
11
2
300)
inserted
Fig
.
36
.
Press
secondary
tensioner
down
fully
and
insert
wire
through
through
bellhousinghole
and
finto
flywheel
(arrow)
.
holes
(arrow)
to
lock
.
Timingchain
tensioner
varies
depend-
ing
on
engine
(M52
engine
tensioner
shown)
.
26
.
Lockcamshafts
at
TDC
.
"
Remove
three
cylinder
head
cover
mounting
studs
28
.
Remove
mounting
nuts
from
front
of
intake
camshaft
from
across
rear
of
head,
if
applicable
.
sprocket
.
Remove
camshaft
sprocket,
thrust
washer(s),
"
Mount
BMW
special
tool
no
.
11
3
240
over
square
and
where
applicable,
spring
plate
.
ends
of
camshafts
.
Check
that
tool
is
squarely
seated
on
cylinder
head
gasket
surface
.
If
necessary,
rotate
NOTE-
camshafts
slightly
using
a
24
mm
wrench
at
hexon
Where
applicable,
make
note
of
thrust
washer
positions
.
camshaft(s)
.
See
Fig
.
35
.
The
thicker
(0
.4
mm)
washer
is
mounted
outermost
.
CYLINDER
HEAD,6-CYLINDER
Page 80 of 759
113-14
CYLINDER
HEAD
REMOVAL
AND
INSTALLATION
29
.
Remove
mounting
nuts
from
front
of
exhaustcamshaft
sprocket
.
Remove
secondary
sprockets
together
with
timing
chain
from
front
of
camshafts
.
CAUTION-
The
crankshaft
must
not
be
allowed
to
rotate
once
the
camshaft
timing
chain
is
removed
.
The
pistons
can
contact
thevalves
.
NOTE-
Do
not
remove
the
sprockets
from
the
chain
unless
these
parts
are
being
replaced
.
Wire
tie
each
sprocket
to
the
chain
to
keep
the
sprockets
timed
to
each
other
.
30
.
Unbolt
secondary
timing
chain
tensioner
from
top
of
cylinder
head
.
31
.
Remove
primary
timing
chaintensioner
from
side
of
cylinder
head
.
See
Fig
.
37
.
Fig
.
37
.
Primary
timing
chain
tensioner
(arrow)
.
WARNING
-
Remove
tensioner
slowly-¡t
ís
under
spring
pres-
sure
.
32
.
Remove
timing
chainguíde
(Tono
E8
socket)
.
See
Fig
.
38
.
33
.
Lift
primary
chain
sprocket
off
exhaust
camshaft
.
Re-
move
sprocket
from
chain
.
Suspend
chainusing
stiff
wire
.
Cylinder
head
assembly,
removing
34
.
Remove
two
mounting
bolts
holding
cylinder
head
to
lower
timing
chaincover
(Torx
E8
socket)
.
See
Fig
.
39
.
CYLINDER
HEAD,
6-CYLINDER
Fig
.
38
.
Timing
chain
guide
mounting
bolts
(arrows)
.
M50
engine
shown
.
Fig
.
39
.
Cylinder
head-to-timing
chain
covermounting
boits(arrows)
.
(Bolt
A
also
retains
secondary
chain
tensioner
.)
35
.
Using
BMMI
special
tool
no
.
11
2
250
or
an
equivalent
tool,
loosen
cylinder
head
bolts
in
several
stages
.
See
Fig
.
40
.
Discard
head
boits
.
CAUTION-
Torx-type
cylinder
head
bolts
should
not
be
re-
used
.
Theyare
stretch-type
bolts
and
must
atwaysbe
replaced
whenever
loosened
.
Page 81 of 759
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
Page 84 of 759
113-
1
8
CYLINDER
HEAD
REMOVAL
AND
INSTALLATION
CYLINDER
HEAD,
6-CYLINDER
Fig
.
46
.
Primary
chaintensioner
being
installed
.
Piston
cutout
must
engage
chain
rail
.
22
.
Install
intake
cam
cover
and
then
install
cylinder
head
cover
.
Check
for
correct
seating
of
half-moons
in
back
of
cylinder
head
cover
.
Use
a
small
amount
of
3-Bond
O
1209
orequivalent
seaiant
at
corners
of
half-moon
cut-
outs
.
23
.
Install
front
exhaust
pipes
to
manifolds
using
new
gas-
kets
and
nuts
.
Coat
manifold
studs
with
copper
paste
prior
to
installing
nuts
.
24
.
Installationof
remaining
parts
is
reverse
of
removal
.
Refill
cooling
system
as
described
in
170
Radiator
and
Cooling
System
.
Change
engine
oil
and
filter
as
de
scribed
in
020
Maintenance
Program
.
Check
adjust-
ment
of
accelerator
cable
.
Additional
tightening
torques
are
given
below
.
Reconnect
battery
last
.
25
.
Installationof
remaining
parts
is
reverse
of
removal,
noting
the
following
:
"
Make
sure
all
sealing
surfaces
are
clean
and
free
of
old
gasket
material
.
Insta¡¡
new
intake
manifold
gasket
.
"
Reinstall
harness
connectors
for
oil
pressure
switch
and
coolant
temperature
sensor
before
installing
in-
take
manifold
.
"
Refill
cooling
systemas
described
in
170
Radiator
and
Cooling
System
.
"
Change
engine
oil
and
filter
as
described
in
020
Main-
tenance
Program
.
"
If
necessary,
adjust
accelerator
cable
.
"
Reconnect
battery
last
.
CAUTION-
To
prevent
damaging
engine
electronic
systems,
be
sure
to
install
all
ground
wirespreviously
re-
moved,
including
the
ground
wires
at
the
cylinder
head
for
the
ignition
coils
.
Tightening
Torque
Tightening
Torques
"
Cylinder
head
cover
"
Coglant
drain
plug
to
cylinder
block
.
.
25
Nm
(18
ft-Ib)
to
cylinder
head(M6
screws)
.
.
.....
10
Nm
(89
in-lb)
"
Intake
manifold
to
cylinder
head
.
...
.
15
Nm
(11
ft-Ib)
"
Radiator
cooling
fan
to
coolant
pump
.
40
Nm
(30
ft-Ib)
"
Radiator
drain
screw
to
radiator
.
..
2
.5
Nm
(22
in-lb)
Page 95 of 759
Valves
Valve
specifications
are
listed
in
Table
d
.
Remove
carbon
deposits
from
thevalves
using
a
wire
brush
or
wire
wheel
.
Specification
M42
engine
M42IM44
engines
M50
engine
M50,
M52
engines
S50
USIS52
US
(1992)
(1993-1998)
(1992)
(1993-1998)
I
engine
(1995-1998)
Valve
head
dia
.
Intake
133
.0
mm
(1
.299
in)
133
.0
mm
(1
.299
in)
33
.0
mm
(1
.299
in)
33
.0
mm
(1
.299
in)
130
.0
mm
(1
.181
in)
Exhaust
30
.5
mm
(1
.201
in)
30
.5
mm
(1
.201
in)
30
.5
mm
(1
.201
in)
~
30
.5
mm
(1
.201
in)
27
.0
mm
(1
.063
in)
Valve
stem
dia
.
Standard
Intake
6
.975-0
.015
mm
5
.975-0
.015
mm
6
.975-0
.015
mm
5
.975-0
.015
mm
5
.975-0015
mm
(0
.2746-00006
in)
(0
.2352-00006
in)
(0
.2746-00006
in)
(0
.2352-00006
in)
(0
.2352
-
00006
in)
Exhaust
6
.960-0015
mm
5
.960-0
.015
mm
6
.960
--0
.015
mm
5
.960
-0
.015
mm
5
.960-0
.015
mm
(0
.2740-00006
in)
(0
.2345-0
.0006
in)
(0
.2740--0
.0006
in)
(0
.2345-0
.0006
in)
(0
.2345-0
.0006
in)
Intake
7
.075-0
.015
mm
6
.075-0
.015
mm
7
.075-0
.015
mm
6
.075-0
.015
mm
6
.075-0
.015
mm
(0
.2785-00006
in)
(0
.2392-0
.0006
in)
(0
.2785-00006
in)
(0
.2392
-
00006
in)
(0
.2392-00006
in)
Exhaust
7
.060-0015
mm
6
.060-0015
mm
7
.060-0
.015
mm
6
.060-0015
mm
6
.060-0015
mm
(0
.
2779-0
.0006
in)
(0
.2386-00006
in)
(0
.2779-00006
in)
(0
.2386-00006
in)
(0
.2386-00006
in)
Oversize
2
Intake
7
.175-0
.015
mm
6
.175-0
.015
mm
7
.175-0
.015
mm
6
.175-0
.015
mm
6
.175-0
.015
mm
(0
.2825-00006
in)
(0
.2431-00006
in)
(0
.2825-00006
in)
(0
.2431--0
.0006
in)
(0
.2431-00006
in)
Exhaust
7
.160-0015
mm
6
.160-0015
mm
7
.160-0
.015
mm
6
.160-0015
mm
6
.160-0-015
mm
(0
.2819
-
00006
i
n
)
(0
.2425-00006
in)
(0
.2819-00006
in)
(0
.2425-00006
in)
(0
.2425-00006
in)
Valves,
leak
test
NOTE-
BMW
speclal
tools
are
available
to
remove
the
valve
To
test
thevalves
for
leakage,
the
camshafts
and
camshaft
stem
oil
seals
.
As
an
alternative,
standard
valvesea¡
carriers
(where
applicable)
should
first
be
removed
.
Instali
the
removal
tools
are
available
from
most
automotive
parts
valve
assemblies
and
the
spark
plugs
in
each
cylinder
.
Place
stores
.
See
Flg
.
17
.
the
cylinder
head
on
a
workbench
with
the
combustion
cham-
ber
facing
upward
.
Fill
each
combustion
chamber
with
a
thin
non-flammable
liquid,
suchas
a
parts
cleaning
fluid
.
After
fif-
teenminutes,
check
the
leve¡
of
the
fluid
.
If
the
fluid
level
in
any
cylinder
drops,
thatcylinder
is
not
sealing
properly
.
Valve
Stem
Oil
Seals
The
purpose
of
the
valve
stem
oil
sea¡
is
to
prevent
excess
oil
from
entering
the
combustion
chamber
.
The
sign
offautty
valve
stem
oil
seals
is
excessive
oil
consumption
and
smoke
from
the
exhaust
immediately
after
starting
and
during
decel-
erat¡on
NOTE-
Valve
stem
oil
seals
should
not
be
reused
.
ff
valves
are
removed,
new
valve
stem
oil
seals
should
be
installed
.
Valve
stem
oil
sea¡
replacement
requires
that
the
cylinder
head
be
disassembled
and
thevalves
removed
as
described
above
under
Valves,
removing
and
installing
.
CYLINDER
HEAD
AND
VALVETRAIN
116-
11
Table
d
.
Valve
Specifications
Fig
.
17
.
Valve
stem
oil
sea¡
being
removed
from
valve
guide
.
Lubricate
the
new
seals
and
insta¡]
them
using
hand
pres-
sure
only
.
Be
sure
to
install
the
valve
spring
seat(s)
before
in-
stalling
the
sea¡
.
CYLINDER
HEAD
AND
VALVETRAIN,
RECONDITIONING
Page 106 of 759
117-
1
0
CAMSHAFT
TIMING
CHAIN
21
.
On
1993
and
lates
engines
:
Remove
access
plugs
from
24
.
On
1993
and
later
engines
:
VANOS
control
unit
in
front
of
exhaust
camshaft
"
Remove
VANOS
control
unit
as
described
laterinthis
sprocket
.
Remove
4
bolts
from
exhaust
camshaft
repair
group
.
sprocket
(useTono
El0
socket)
.
See
Fig
.
26
.
"
Remove
intake
camshaft
sprocket
mounting
nuts
.
"
Remove
intake
and
exhaust
sprockets
together
with
secondary
chain
.
Note
location
of
thrust
washers
and
spring
plate
(where
applicable)
on
intake
sprocket
.
Fig
.
26
.
Exhaust
camshaftmounting
bolts
(arrows)
.
CAMSHAFT
TIMING
CHAINS,
6-CYLINDER
0013056
22
.
Depress
secondary
timing
chain
tensiones
and
lock
down
by
inserting
stiff
wire
into
the
openings
in
rear
of
tensioner
.
See
Fig
.
27
.
Fig
.
27
.
Secondary
timing
chaintensioner
being
locked
down
on
M50
engine
.
Press
tensioner
downand
insert
locking
wire
through
holes(arrows)
.
Tensioner
on
M52/S52
US
engines
vary
slight-
23
.
Remove
secondary
chain
tensioner
and
lift
out
primary
chain
guide
.
NOTE-
Hold
the
camshaft
stationary
(at
hex
on
camshaft)
when
loosening
ortightening
sprocket
mounting
boits
.
CAUTION-
The
crankshaft
must
not
be
allowed
to
rotate
once
the
timing
chain
is
removed
.
The
pistons
can
con-
tact
the
valves
.
25
.
On
1992
engines
:
"
Remove
from
intake
and
exhaust
sprocket
mounting
bolts
.
"
Remove
sprockets
together
with
secondary
chain
.
26
.
Remove
bolts
holding
lower
timing
chain
cover
to
cylin-
der
head
(use
Torx
E8
socket)
.
See
Fig
.
28
.
MR111:
R
Fig
.
28
.
Cylinderhead-to-timingchain
covermounting
bolts
(arrows)
.
27
.
Using
a
drift,
drive
two
locatiog
dowels
in
left
and
right
sides
of
lower
timing
chaincover
toward
rear
of
car
.
Re-
move
covermounting
boits
and
carefully
lift
cover
off
.
See
Fig
.
29
.
CA
UTION-
Use
care
when
removing
the
cover
from
the
cylin-
der
head
gasket
.
If
the
cover
is
stuck,
useasharp
knife
to
separate
it
from
the
head
gasket
.
Page 110 of 759
117-
1
4
CAMSHAFT
TIMING
CHAIN
22
.
Installation
of
remaining
parts
is
reverse
of
removal,
When
theengine
is
running,
the
piston
housing
is
supplied
noting
the
following
:
with
pressurized
engine
oil
.
At
idie,
the
solenoid
isin
the
off
"
When
installing
thermostat,
make
sure
arrow
or
vent
position
(de-energized)
and
valve
timing
is
maintained
in
the
hole
faces
up,
if
applicable
.
normal
position
:
When
the
solenoid
is
energized,
the
gear
cup
"
Refill
cooling
systemas
described
in
170
Radiator
piston
moves
forward
to
advance
the
camshaftby
a
maximum
and
Coming
System
.
of
12
.5
.
"
Install
oil
pan
as
described
in
119
Lubrication
Sys-
tem
.
"
Fill
engine
with
oil
and
install
a
new
oil
filter
as
de-
scribed
in
020
Maintenance
Program
.
"
Insta¡¡
ground
wires
at
cylinder
head
cover
mounting
studs
and
at
front
of
cylinder
head
and
thermostat
housing,
where
applicable
.
VANOS
system
operation,
testing
Tightening
Torques
There
are3
special
tools
required
to
check
VANOS
opera-
"
Coolant
drain
plugto
cylinder
block
.
.
25
Nm
(18
ft-Ib)
tion
;
an
electricaltest
lead
(BMW
special
tool
no
.
12
6
410),
an
"
Radiator
cooling
fan
to
coolant
pump
.
40
Nm
(30
ft-Ib)
air
line
fitting
(BMW
special
tool
no
.
11
3
450),
and
a
crank-
"
Radiator
drain
screw
to
radiator
...
.
2
.5
Nm
(22
in-Ib)
shaft
TDC
locking
tool
(BMW
special
tool
no
.
112
300)
.
"
Upper
timing
chaincover
to
cylinder
head
The
test
leal
is
used
to
power
the
solenoid,
simulating
the
M6
nut
...
.....
.............
..
.
10
Nm
(89
in-lb)
ground
signal
from
the
DME
control
unit
.
The
air
line
fitting
M8
bolt
.....
....
.
.
.............
22
Nm
(17
ft-Ib)
takes
the
place
of
the
oil
supply
line
fitting
to
simulate
oil
Ares-
"
VANOS
control
unit
to
cylinder
head
sure
.
The
locking
tool
positions
and
locks
the
crankshaft
at
M6
nut
.........
..
..
.
..........
10
Nm
(89
in-lb)
TDC,
cylinder
no
.
l.
M8
bolt
........
...
.............
22
Nm
(17
ft-Ib)
"
VANOS
oil
supply
pipe
to
VANOS
control
unit
1
.
Remove
alternator
cooling
air
duct
.
banjo
bolt
.......
..
..
.
..........
32
Nm
(24
ft-Ib)
VANOS
(VARIABLE
VALVE
TIMING)
3
.
Remove
top
plastic
enginecovers
.
Disconnect
ignition
coil
harness
connectors
fromcofs
.
Remove
ignition
1993
and
later
6-cylinder
engines
are
equipped
with
a
vari-
coils
.
able
valve
timing
system
called
VANOS
.
This
system
is
con-
trolled
by
the
engine
management
system
and
dynamically
4
.
Remove
cylinder
head
cover
mounting
bolts
and
re-
adjusts
intake
camshaft
timing
based
on
engine
load,
engine
move
cylinder
head
cover
.
Unclip
andremove
oil
baffle
speed
and
engine
temperature
.
cover
from
above
intake
camshaft
.
See
113
Cylinder
Head
Removal
and
installation
.
The
main
components
of
the
VANOS
system
are
the
control
unit
with
piston
housing
and
integral
spool
valve,
and
the
mod-
ified
intake
camshaft
.
See
Fig
.
35
.
VANOS
(VARIABLE
VA
LVE
TIMING)
Fig
.
35
.
VANOS
control
unit
with
modified
intake
camshaft
.
B11001
WARNING
-
Special
BMW
service
tools
are
required
to
check
and
repair
the
VANOS
System
.
Read
theproce-
dures
through
before
beginning
the
job
.
2
.
Disconnect
crankcase
ventilation
hose
fitting
from
cyl-
inder
head
cover
.
NOTE-
Note
the
arrangement
of
the
cylinder
head
cover
bolt
insulators
and
gaskets
during
removal
.
5
.
Set
engine
to
approximate
TDC
by
rotating
in
normal
operating
direction
until
camshaft
lobes
at
cylinder
no
.
1
are
facing
each
other
.
See
Fig
.
20
.
6
.
Set
engine
to
TDC
by
aligning
"0/T"
mark
(0°TDC)on
front
vibration
damper
withcast
boss
on
lower
timing
chain
cover
.
See
Fig
.
21
.
7
.
Lock
crankshaft
in
position
by
inserting
BMW
special
tool
no
.
11
2
300
through
transmission
bellhousing
and
into
hole
in
flywheelor
driveplate
.
See
Fig
.
36
.
NOTE-
Confirm
that
the
locking
tool
has
been
correctly
in-
stalled
by
trying
to
rotatethe
crankshaft
.
Page 111 of 759
Fig
.
36
.
BMW
special
tool
no
.
11
2
300
installed
through
bellhousing
and
finto
flywheel
.
8
.
Remove
oil
line
fitting
from
VANOS
control
unit
.
NOTE-
Wrap
the
VANOS
oil
line
fitting
with
a
shop
to
absorb
leaking
oil
.
9
.
Using
hollow
bolt
and
seals
from
oil
supply
line,
instan
BMW
special
tool
no
.
11
3
450
(air
line
fitting)
and
con-
nect
a
supply
of
compressed
air
(30-115
psi)
to
VANOS
oil
fitting
.
10
.
Measure
and
record
distance
between
trigger
plate
edge
and
side
of
secondary
timing
chain
tensioner
.
See
Fig
.
37
.
Fig
.
37
.
VANOS
reference
measurement
(dimension
A)
between
trig-
ger
píate
(sender
gear)
and
side
of
secondary
chain
tensioner
.
CAMSHAFT
TIMING
CHAIN
117-
1
5
11
.
Disconnectharness
connector
from
VANOS
solenoid
.
Connect
BMW
special
tool
no
.
12
6
410
(electrical
test
lead)
to
VANOS
solenoid
connector
.
"
Connect
positive
(+)
test
lead
to
positive
(+)
terminal
ofbattery
Connect
negative
(-)
test
leadto
chassis
ground
.
solenoid
should
audibly
click
and
intake
cam-
shaft
should
advance
.
CA
UTION-
"
Be
sure
to
connect
the
test
hamess
polaritycor-
rectly
.
lf
the
polarity
is
reversed,
the
intemal
diode
in
the
VANOS
solenoid
will
be
destroyed
.
Although
the
solenoid
will
still
functionwith
a
faultydiode,
a
fault
code
may
be
set
in
the
ECM
memory
.
"
To
confirm
voltage
polarity,
turn
the
ignition
on
and
check
for
positive
(+)
batteryvoltage
at
the
terminal
corresponding
to
the
redlwhite
wire
in
the
main
harness
connector
.
Check
that
the
pos-
itive
terminal
(+)
in
the
main
connector
corre-
sponds
to
the
same
terminal
in
the
solenoid
connector
that
is
being
connected
to
the
battery
.
12
.
With
solenoid
actuated,
measure
and
record
new
dis-
tance
between
trigger
plate
edge
and
side'of
second-
ary
timing
chain
tensioner,
as
shown
in
Fig
.
37
.
13
.
Difference
between
first
measurement
(step
10)
andsecond
measurement
(step12)
should
be
at
least
8
.5
mm
(0
.3346
in
.)
.
lf
any
faults
arefound,
solenoid
may
be
faulty,
or
hydraulic
control
unit
may
be
faulty
or
incor-
rectly
installed
.
14
.
Check
VANOS
solenoid
byremoving
it
from
control
unit
.
Check
that
solenoid
plunger
and
control
unit
plunger
move
freely
.
Install
solenoid
using
tighteníng
torque
given
below
.
NOTE-
"
The
solenoid
is
available
asareplacement
part
.
lf
the
control
unit
plunger
is
sticking,
the
complete
control
unit
will
have
to
be
replaced
.
"lf
the
VANOS
system
does
not
advance
correctly
and
no
other
faults
can
be
found,
itis
possible
that
the
VANOS
control
unit
may
Nave
been
fnstalled
incor-
rectly-especially
if
the
camshaft
sprockets
have
pre-
víously
been
removed
for
other
repairs
.
Check
the
installation
by
removing
and
reinstalling
the
control
unit
as
described
later
.
VANOS
(VARIABLE
VALVE
TIMING)
Page 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
.