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
Fig
.
44
.
Secondary
chain
sprockets
and
chain
being
installed
.
Attachsprockets
with
arrows
pointing
upand
elongated
holes
cen-
tered
.
CYLINDER
HEAD
REMOVAL
AND
INSTALLATION
113-17
Spring
17
plate
0012543
Fig
.
45
.
VANOS
spring
plate
and
thrust
washerson
later
engines
.
14
.
Insta¡¡
BMW
special
tool
no
.
11
3
390
into
primary
tim-
ing
chain
tensioner
sleeve
.
Thread
tool
in
finger
tight
until
siack
is
removed
from
chain
.
NOTE-
BMW
special
tool
no
.
11
3
390
is
a
dummy
primary
chain
tensioner
and
simulatesthe
function
of
the
ten-
sioner
.
15
.
Insta¡¡
VANOS
unit
as
described
in
117
Camshaft
Tim-
ing
Chain
.
CAUTION-
Special
ínstallation
instructions
apply
when
mounting
the
VANOS
unit
to
the
cylinder
head
.
Be
sure
to
follow
the
procedurefound
in
117
Cam-
shaft
Timing
Chain
.
16
.
Slowlyuniock
and
release
secondary
chain
tensioner
.
17
.
Preloadprimary
chain
by
tightening
BMW
special
tool
no
.
11
3390
(dummy
chain
tensioner)
to
1.3
Nm
(11
in-
lb)
.
Then
tighten
exhaust
secondary
camshaft
sprocket
mounting
bolts
in
two
stages
.
Tightening
Torque
"
Secondary
timing
chain
sprocket
to
exhaust
camshaft
(Torx
bolts)
Stage
1
.
.............
..
..
.
...
5
Nm
(44
in-lb)
Stage
2
..............
..
..
.
,
.
..
22
Nm
(17
ft-1b)
18
.
Remove
flywheel
locking
tool
from
transmission
bell-
housing
.
Remove
camshaft
locking
tool
from
rear
of
cylinder
head
.
19
.
Turn
engine
over
by
hand
at
least
two
fui¡
crankshaft
ro-
tations
.
Reinstall
camshaft
locking
tool
and
flywheel
locking
toolto
make
sure
al¡
adjustments
are
still
cor-
rect
.
lf
settings
are
correct,
remove
locking
tools
.
20
.
Remove
BMW
special
tool
11
3390
(dummy
chain
ten-
sioner)
from
side
of
cylinder
head
.
CAUTION-
Mountintake
camshaft
sprocket
so
thatcollar
side
21
.
Insta¡¡
primary
chain
tensioner
so
that
cutout
in
tension-
of
the
sprocket
faces
camshaft
.
er
piston
engages
chain
rail
.
See
Fig
.
46
.
Using'new
seals,
install
and
tighten
access
plugs
in
VANOS
con
13
.
Install
and
tighten
exhaust
camshaft
sprocket
mounting
trol
unit
.
boits
finger
tight
only
.
Tighten
intake
camshaft
sprocket
mounting
nuts
to
specified
torque
.
Tightening
Torques
"
Access
plugs
Tightening
Torque
to
VANOS
control
unit
.
..
.
.
........
50
Nm
(37
ft-Ib)
"
Intake
camshaft
sprocket
"
Primary
camshaft
timing
chain
tensioner
mounting
nuts
(M6)
..............
10
Nm
(89
in-lb)
to
tensioner
sleeve
..
...
.
.
........
50
Nm
(37
ft-Ib)
CYLINDER
HEAD,
6-CYLINDER
116-
4
CYLINDER
HEAD
AND
VALVETRAIN
NOTE-
"
The
camshaft
bearing
caps
are
coded
with
a
letter
anda
number
.
Forexample,
'541"is
the
exhaustcam-
shaft
bearing
cap
at
the
front
of
the
engine,
and
`El"
is
the
intake
camshaft
bearing
cap
at
the
front
of
the
engine
.
"
Camshafts
are
stamped
with
a
code
letter-'E"
for
the
intakeside
and
A"
for
the
exhaust
side
.
"
"E"
isfor
Einla3,
(German
for
intake)
and
A"
is
for
Auspuff,
(Germen
for
exhaust)
.
"
The
front
of
the
engine
is
at
the
front
of
the
car
.
8
.
Camshaft
installation
is
reverse
of
removal,
noting
the
following
:
"
Prior
to
installation,
check
all
components
for
wear
as
described
below
underCylinder
Head
and
Val-
vetrain
Reconditioning
.
"
Lubricate
camshafts
prior
to
installation
.
"
Reinstall
timing
chain
sprockets
and
tensioner
and
set
valve
timing
before
reinstalling
rocker
arms,as
spe-
cifically
described
in
117
Camshaft
Timing
Chain
.
"
Be
sure
corresponding
camshaft
lobe
is
pointing
up
before
installing
rocker
arms
.
Note
that
each
rocker
arm
angles
away
from
corresponding
spark
plug
hole
.
See
Fig
.
4
.
"
Wait
at
least
10
minutes
for
hydraulic
cam
followers
to
fully
compress
before
cranking
engine
over
with
start-
er
for
the
first
time
.
Tightening
Torques
"
Camshaft
bearing
caps
to
cylinder
head
(M7)
.............
15
Nm
(11
ft-Ib)
"
Cylinder
head
cover
to
cylinder
head
(M6)
.............
10
Nm
(89
in-lb)
"
Primary
timing
chain
tensioner
plug
to
cylinder
head
.
................
40
Nm
(30
ft-lb)
(sea
117
Camshaft
Timing
Chain)
"
Spark
plugs
(M12)
.............
...
23
Nm
(17
ft-lb
Timing
chaincover
(upper)
to
cylinder
head
M6
.....
.
.
...
................
.
10
Nm
(7
.5
ft-Ib)
M7
....
..
.
.
........
.
.....
.
...
.
15
Nm
(11
ft-Ib)
"
Timing
chain
sprockets
to
camshaft
M6
....
.
.
..
..............
.
..
..
10
Nm
(7
.5
ft-Ib)
M7
....
....
..............
.
..
..
.15
Nm
(11
ft
.lb)
(sea
117
Camshaft
Timing
Chain)
Camshafts,
removing
and
installing
(6-cylinder
engine)
Camshafts
on
6-cylinder
engines
can
be
removed
with
the
cylinder
head
mounted
on
the
engine
.
The
first
step
is
to
re-
move
the
cylinder
head
cover
.
See
113
Cylinder
Head
Re-
moval
and
Installation
.
CYLINDER
HEAD,
DISASSEMBLYAND
ASSEMBLY
Fig
.
4
.
Correct
installation
position
ofrocker
arms
(arrows)
on
M44
engine
.
Special
BMW
service
tools
should
always
be
used
to
re-
move
and
instan
the
camshafts
.
Removal
of
camshafts
with-
outthe
special
tools
can
result
in
personal
injury
and/or
cylinder
head
damage
.
WARNING
-
The
processof
evenly
loosening
the
camshaft
bear-
ing
cap
nuts
is
NOT
en
acceptable
method
of
re-
moving
the
camshafts
.
Special
tools
shouldalways
be
used
lo
remove
the
camshafts
.
Be
sure
to
read
the
procedure
through
before
starting
ajob
.
1
.
Disconnect
negative
(-)
battery
cable
.
CAUTION-
Prior
to
disconnectiog
the
battery,
read
the
battery
disconnection
cautions
given
at
the
front
of
this
manual
onpaga
viii
.
516
2
.
Setengine
to
TDC
and
lock
into
position
by
installing
BMW
special
tool
11
2
300
through
transmission
bell-
housing
and
into
hole
in
flywheel
or
drive
platea
See
Fig
.
5
.
NOTE-
Arrows
on
camshaft
sprockets
shouldbe
pointing
up
.
Sea
117
Camshaft
Timing
Chain
.
3
.
Remove
VANOS
control
unit
from
cylinder
head
.
Re-
move
timing
chainsprockets
from
camshafts
.
See117
Camshaft
Timing
Chain
.
4
.
Remove
sparkplugs
and
insta¡¡
BMW
special
tool
11
3
260/11
3
270
to
cylinder
head
.
Tighten
tool
retaining
bolts
in
spark
plug
holes
.
Do
not
ovar-tighten
bolts
.
See
Fig
.
6
.
Fig
.
5
.
BMW
special
tool
11
2300
(arrow)
inserted
through
bell-
housing
hole
and
finto
flywheel
.
A
Tightening
Torque
"
BMW
special
tool11
1
260/11
3
270
to
cylinder
head
.................
23
Nm
(17
ft-Ib)
5
.
Remove
intake
camshaft
bearing
cap
no
.
1
.
6
.
Turn
eccentric
shaft
on
special
tool
until
pressure
is
ap-
plied
to
camshaft
bearing
caps
.
See
Fig
.
7
.
7
.
Remove
remaining
bearing
capmounting
nuts
.
CYLINDER
HEAD
AND
VALVETRAIN
116-
5
NOTE-
Fig
.
7
.
Special
tool
(eccentric
shaft)
beingturned
to
apply
pressure
to
camshaft
bearing
caps
.
8
.
Slowly
release
pressure
oncamshaft
bearing
capsby
turning
eccentric
shaft
.
Remove
bearing
caps
and
camshaft
.
Repeat
procedure
on
remaining
camshaft
.
CAUTION-
Camshaft
bearing
capsmust
be
reinstalled
in
their
original
locations
.
"
The
camshaft
bearing
caps
are
coded
with
a
letter
and
a
number
.
For
example,
`A1
"is
the
exhaust
cam-
shaft
bearing
cap
at
the
front
of
the
engine,
and
"E1"
is
the
intake
camshaft
bearing
cap
at
the
front
of
the
engine
.
"
The
camshaftsare
stamped
with
a
code
letter-`E"
for
the
intake
síde
and
`A"
for
the
exhaust
side
.
F19
.6
.
Special
BMW
tool
no
.
11
3260
(A)
with
adapter
ll
3
270
(B)
.
Tool
mounting
bolts
(arrows)
thread
into
spark
plug
holes
.
"
"E"
is
for
Einfal3,
(German
for
intake)
and
`A"
is
for
Auspuff,
(German
for
exhaust)
.
"
The
front
of
the
engine
is
at
the
front
of
the
car
.
CYLINDER
HEAD,
DISASSEMBLYAND
ASSEMBLY
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
NOTE-
The
vibration
damper
center
bolt
is
very
tight
.
A
heavy
duty
holding
device,
such
as
BMW
special
tool
no
.
112
150,
should
be
used
to
hold
the
vibration
damper
hub
V
stationary
while
the
bolt
is
loosened
.
v
11
.
Usingloosened
bolt
at
vibration
damper,
turn
crank-
shaft
to
TDC
and
lock
in
position
by
inserting
BMW
special
tool
no
.
11
2
300
through
transmission
bell-
-
p
housing
.
See
Fig
.
5
.
v
O
NOTE-
I\
0011966a
"
If
necessary,
remove
plugfrom
locating
boye
in
lower
edge
of
bell
housing
.
"
Confirm
that
locatng
tool
has
been
correctlyinstalled
by
trying
to
rotate
the
crankshaft
.
Fig
.
7
.
Lower
timing
chain
cover
mounting
bolts
(arrows)
.
Bolts
A
Fig
.
5
.
BMW
special
tool
no
.
11
2300
installed
through
bellhousing
are
installed
through
hollow
locating
dowels
.
and
finto
flywheel
to
lock
crankshaft
at
TDC
(arrow)
.
CA
UTION-
Thecamshafts
mustbe
locked
in
the
MC
position
using
the
specialservice
tool
before
removing
the
timing
chain
.
The
tool
holds
the
camshafts
parallel
to
each
other
and
perpendicular
to
the
valve
cover
gasket
surface
.
12
.
Lockcamshafts
at
TDC
bymounting
BMW
special
tool
no
.
113
240
over
square
ends
of
camshafts
.
See
Fig
.
6
.
"
Check
that
tool
is
squarely
seated
on
cylinder
head
gasket
surface
.
If
necessary,
rotate
camshafts
slightly
using
an
open-end
wrench
at
hexon
camshafts
.
13
.
Remove
lower
timing
chaincover
mounting
bolts
and
carefully
lift
cover
off
.
Clean
sealing
surfaces
and
gas-
ket
grooves
.
See
Fig
.
7
.
14
.
Remove
hydraulic
chaintensioner
from
right
side
of
cyl-
inder
head
.
See
Fig
.
8
.
CAMSHAFT
TIMING
CHAIN
117-
3
Fig
.
6
.
BMW
special
tool
no
.
11
3240
installed
on
rearof
camshafts
to
position
camshafts
at
TDC
.
(M44
camshafts
shown
.
Other
engines
are
similar
.
Fig
.
8
.
Hydraulic
chain
tensionerplug
(arrow)
.
CAMSHAFT
TIMING
CHAIN,
4-CYLINDER
117-
8
CAMSHAFT
TIMING
CHAIN
Fig
.
18
.
Oil
baffle'
cover
being
removed
.
Fig
.
19
.
Upper
timing
chaincover
mounting
nuts
(arrows)
on
pre-
VANOS
engines
.
16
.
Secure
crankshaft
hub
to
prevent
crankshaft
from
turn-
ing
.
Using
a
socket,
loosen
but
do
not
remove
crank-
shaft
hub
center
bolt
.
CAMSHAFT
TIMINGCHAINS,
6-CYLINDER
Fig
.
20
.
Engine
set
to
approximate
TDC
.
Camshaft
lobes
face
in
and
arrows
on
sprockets
point
up
(arrows)
.
B1
1123a
Fig
.
21
.
O/
T
(0°TDC)
mark
on
vibration
damper
aligned
with
boss
on
timing
chain
cover
(arrow)
.
17
.
Lock
crankshaft
in
TDC
position
by
inserting
BMW
spe-
cial
tool
no
.
11
2
300
through
transmissionbellhousing
and
into
hole
in
flywheelor
drive
plate
.
See
Fig
.
23
.
NOTE-
Confirm
that
the
locking
tool
has
been
correctly
in-
stalled
by
trying
to
rotate
the
crankshaft
.
NOTE-
The
crankshaft
hub
center
bolt
is
tightened
to
a
torque
18
.
Remove
crankshaft
hub
bolt
and
washer
.
Remove
hub
of
410
Nm
(300
ft-ib)
.
A
heavy
duty
holding
device,
from
crankshaft
.
suchas
BMW
special
tool
no
.
112150,
should
be
used
to
hold
the
crankshaft
hub
stationary
while
the
bolt
is
19
.
Remove
cylinder
head
cover
mounting
studs
at
rear
of
loosened
.
Use
a
heavy
duty
314-inch
drive
socket
and
head
.
Lock
camshafts
at
TDC
using
BMW
special
tool
breaker
bar
to
break
the
bolt
free
.
no
.
11
3
240
at
ends
of
camshafts
.
See
Fig
.
24
.
.
Fig
.
22
.
Vibration
damper
with
drive
belt
pulley
being
removed
.
Notehub
locating
dowel
(arrow)
.
Fig
.
23
.
BMW
special
tool
no
.
11
2
300
installed
through
bellhousing
and
into
flywheel
.
20
.
Remove
primary
chain
tensioner
plug
and
primary
chain
tensioner
.
See
Fig
.
25
.
CAMSHAFT
TIMING
CHAIN
117-
9
Fig
.
24
.
BMW
special
tool
no
.
113
240
installed
on
rear
of
camshafts
to
position
camshafts
at
TDC
.
(M44
camshafts
shown
.
Other
engines
are
similar
.)
Fig
.
25
.
Primary
chain
tensioner
plug
(arrow)
.
CAUTION-
"
Check
thattool
is
squarely
seated
on
cytinder
head
gasket
surface
.
If
necessary,
rotate
cam-
shafts
slightly
using
a
24
mm
wrench
"
On
pre-VANOS
engines
(engines
built
up
to
8-
92),
the
camshaft
locking
tool
may
not
fit
correct-
ly
when
the
crankshaft
is
set
to
TDC
.
Do
notas-
sume
the
valve
train
is
out
oftime
.
On
some
engines,
valve
overlap
may
havebeen
reduced
as
a
dealer
service
campaign
to
correct
for
an
uneven
idle
.
Check
thetiming
by
placing
a
3mm
drill
bit
under
the
left
and
right
outside
edges
while
pressíng
down
on
thecenter
of
the
tool
(tool
center
bolts
loosened)
.
If
the
tool
now
fits,
the
campaign
has
beendone
on
the
engine
.
CAMSHAFT
TIMING
CHAINS,
6-CYLINDER