1995 BMW 318i Torque special

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

116-
6



CYLINDER
HEAD
AND
VALVETRAIN

9
.
Camshaft
installation
is
reverse
of
removal,noting
the

following
:

"
Prior
to
installation,
check
al¡
components
for
wear
as
described
below
under
Cylinder
Head
and
Val-

vetrain
Reconditioning
.

"
Crankshaft
must
be
at
least
45°
away
from
MC
before

installing
camshafts
to
cylinder
head
.

"
Lubricate
camshafts
prior
to
installation
.
"
Insta¡¡
camshafts
into
cylinder
head
with
lobes
for
cyl-
inder
no
.
1
pointing
up
and
towards
each
other
.
See
Fig
.
8
.

"
After
installing
camshaft(s),
observe
specified
waiting

time
for
hydraulic
cam
followers
to
fully
compress
be-

fore
bringing
crankshaft
back
to
TDC
.

Fig
.
8
.



Camshaft
correctly
positioned
for
reassembly
so
thatcylinder
no
.
1
lobes
(arrows)
face
each
other
.

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
chaintensioner
to
cylinder
head-see
117
Camshaft
Timing
Chain
"
Spark
plugs
(M12)
.............
.
.
23
Nm
(17
ft-Ib)

"
Timing
chain
sprocket
to
camshaft
flange
(M6)-see
117
Camshaft
Timing
Chain

CYLINDER
HEAD,
DISASSEMBLYAND
ASSEMBLY

Valves,
removing
and
installing

1
.
Remove
cylinder
head
as
described
in
113
Cylinder

HeadRemoval
and
Installation
.
Remove
exhaust

manifold(s)
.

2
.
Remove
camshafts
using
special
tools
as
descríbed

earlier
.

3
.
On
M42
and
al¡
6-cylinder
engines
:
Remove
camshaft

carriers
by
pulling
them
straight
up
off
mounting
studs
.

CAUTION-

"
Do
not
let
the
hydraulic
cam
followers
fa¡¡
out
as
the
camshaft
carrier
is
removed
.
Special
suction
cupsare
available
from
BMW
to
hold
the
hydrau-
lic
cam
followers
in
place
during
carrier
removal
.
Camshaft
installation
waiting
times

"
at
or
above
68°F
(20
0
C)
....
..
.
..
......
10
minutes

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

"
32-50°F
(0-10°C)
....
.
..
....
.
..
......
75
minutes
4
.
On
M44
engines
:
Remove
all
hydraulic
valve
adjusters
.
See
Hydraulicvalve
adjusters,
checking
and
re-
"
Reinstall
timing
chainsprockets
and
tensioner
as
spe-



placing
(M44
engine),
later
in
this
section
.
cifically
described
in
117
Camshaft
Timing
Chain
.
"
Waít
at
least
10
minutes
before
cranking
engine
over



CAUTION-
withstarter
motor
for
the
first
time
.



Hydraulic
valve
adjusters
should
be
stored
in
an
upright
position
.
lf
necessary,
use
amagnetic
tool
to
aid
in
removal
of
the
adjusters
.

"
Hydraulic
cam
followers
shouldbe
stored
in
an
upright
position
.

5
.
Remove
valves
using
a
valve
spring
compressor
.

NOTE-

"
The
M44
cylinder
head
has
recessed
valve
stems
.
This
requires
the
use
of
a
special
valve
spring
com-
pressor
tool
.

"
Label
each
valve
assembly
as
it
is
removed
so
it
can
be
installed
in
its
original
position
.

6
.
Remove
and
discard
valve
stem
oil
seals
from
valve
guides
.
See
Valve
stem
oil
seals
later
in
this
section
.

7
.
Valve
installation
is
reverse
of
removal
.

"
Reinstall
exhaust
manifold(s)
with
new
gaskets
.
Use
Molycote
HSC'
5
or
equivalent
anti-seize
thread
com-
pound
on
fasteners
.

Tightening
Torque

"
Exhaust
manifold
to
cylinder
head
M7
............
..
...
....
.
...
..
20
Nm
(15
ft-Ib)

116-
1
0



CYLINDER
HEADAND
VALVETRAIN

NOTE-

When
checking
a
cam
follower,
make
sure
the
corre-
sponding
camshaft
lobe
ís
facing
up
so
that
there
is
no
valve
spring
pressure
on
the
follower
.

4
.
To
replace
a
cam
follower,
remove
appropriate
cam-

shaft
.
Refer
to
camshaft
removal
procedures
given
ear-
lier
.

5
.
Once
camshaft
is
out
of
way,
withdraw
faulty
cam
fol-

lower
and
replace
with
new
one
.
Inspect
cam
follower

bores
for
wear
and
scoring
.

6
.
Camshaft,
timing
chain
and
cylinder
head
cover
reas-
sembly
is
reverse
of
disassembly
.

Tightening
Torques

"
Camshaft
bearing
caps
to
cylinder
head

M7
....
.
..
.
......
.
.....
...
.
..
.
15
Nm
(11
ft-Ib)

"
Cylinder
head
cover
to
cylinder
headltiming
chain
cover
M6
....
.
..
.
.
.
..........
...
.
.
..
10
Nm
(89
in-lb)

"
Timing
chain
hydraulic
tensioner
to

cylinder
head-see
117
Camshaft
Timing
Chain

"
Timing
chain
sprocket
to
camshaft

flange
(M6)-see
117
Camshaft
Timing
Chain

CYLINDER
HEAD
AND
VALVETRAIN,
RECONDITIONING

Table
c
.
Valve
Guide
Specifications

Fig
.
16
.
Valveguide
wear
being
checked
with
dial
indicator
.
Insert
new
valve
until
stem
end
is
flush
with
end
of
guide(white
arrow)
.
See
Table
c
for
wear
limits
.

NOTE-

Valve
guides



"
Intemational
Organization
for
Standardization
(ASO)
tolerance
classes
are
Gsted
in
Table
c
.
ISO
allowanc

BMW
does
notsupply
valve
guides
as
replacement
parts
.
If



esare
based
on
nominal
sizes
and
should
beused
to

a
valve
guide
is
excessively
worn,
it
should
be
reamed
to
ac-



determine
proper
fit
.
Most
machine
shops
should

cept
oversized
valve
stems
.
Valve
guide
specifications
are



have
thís
informationavailable

listed
in
Table
c
.



"
Replacement
valve
guides
may
be
available
through
aftermarket
suppliers
.
Valve
guide
replacement
re-
Valve
guides
should
be
checked
for
wear
using
a
new



quires
specíal
tools
and
a
press
.
It
is
also
necessary
valve
.
See
Fig
.
16
.
Be
sure
to
thoroughly
inspect
the
cylinder



to
heat
the
cylinder
head
and
chile
the
valve
guides

head
to
ensure
that
it
can
be
reused
before
reworking
the



when
replacing
the
guides
.

guides
.
"
BMW
suppllesoversize
valves
.
Sea
Valves
for
addi-
tional
information
.

Specifications



M42
engine



M421M44
engines



M50
engine



M50,M52,
S50
US,
S52

~
(1992)



~
(1993-1998)



~
(1992)



~
US
engines
(1993-1998)

Valve
guide
wear,
maximum
(valve
tílt
clearance
measured
with
new
valve)



0
.5
mm
(0
.020
in)



0
.5
mm
(0
.020
in)



0
.5
mm
(0
.020
in)



0
.5
mm
(0
.020
in)

Valveguide
inside
diameter,
installed
(tolerance
per
ISO
allowance
H7)
Standard



7
.0
mm
(0
.276
in)



6
.0
mm
(0
.236
in)



7
.0
mm
(0.276
in)



6
.0
mm
(0
.236
in)
Oversize
1



7
.1
mm
(0
.279
in)



6
.1
mm
(0
.240
in)



7
.1
mm
(0.279
in)



6
.1
mm
(0
.240
in)
Oversize
2



7
.2
mm
(0
.283
in)



6
.2
mm
(0
.244
in)



7
.2
mm
(0
.283
in)



6
.2
mm
(0
.244
in)

117-
6



CAMSHAFT
TIMING
CHAIN

15
.
Insta¡¡
upper
timing
chaincover
:



17
.
Remove
crankshaft
locking
tool
from
transmission
bell-

"
Thoroughly
clean
profile
gasketgroove
and
all
sealing



housing
and
camshaft
locking
tool
from
rear
of
cylinder

surfaces
.



head
.

"
Applya
small
bead
ofsilicon
sealer
(3-Bond
1209®
or

equivalent)
to
upper
and
lower
joint
comers
where



18
.
Turn
engine
over
by
hand
in
direction
of
rotation
at
least

chaincover
meets
cylinder
head
.



two
full
rotations
.
Reinstall
camshaft
and
crankshaft

"
Insta¡¡
new
profile
gasket
to
groove
in
lowerchain
cover
.



locking
tools
to
check
engine
timing
.
Repeat
cam
timing

"
Protect
top
of
profile
gasket
using
thin
sheetmetal



procedure
if
tools
do
not
fit
easily
into
position
.
Remove

(BMW
special
tool
no
.
11
2
330
or
equivalent)
.
See



locking
tools
.

Fig
.
15
.
"
Attach
new
gaskets
to
cover
with
light
dabs
of
gasket



19
.
Install
cylinder
head
cover
as
described
in
113
Cylin-

sealant,
hold
gaskets
in
placeusing
cover
mounting



der
HeadRemoval
and
Installation
.

screws
.

"
Place
upper
timing
cover
into
position
.
Snug
down
al¡



NOTE-
screws,
without
tightening
.
Carefully
slide
out
sheet



OnM44
engines,
note
oil
supply
O-ring
and
replace
ff
metal
.



necessary
.
"
Temporarily
install
cylinder
head
cover
without
gasket
.

Insta¡¡
and
tighten
at
least
two
cylinder
head
cover
mounting
bolts
to
seat
upper
timing
chaincover
.
"
Tighten
all
upper
timing
cover
screws
.



Tightening
Torque

"
Remove
valve
cover
.



"
Cylinder
head
cover

to
cylinder
head
(M6
screws)
...
..
.
.
10
Nm
(89
ín-Ib)

-



CAMSHAFT
TIMING
CHAINS,
Fig
.
15
.
When
installing
upper
timing
chain
cover,
use
thin
sheetmetal



6-CYLINDER
(arrow)
to
protect
profile
gasket
when
installing
uppercover
.

Tightening
Torque

"
Upper
timing
chaincover
to
engine
block
or
cylinder
head
(M6
screws)
....
.
..
10
Nm
(89
in-lb)

16
.
Install
vibration
damper
while
aligning
woodruff
key
.
Hold
crankshaft
stationary
and
tighten
mounting
bolt
.

Tightening
Torques



I
CAUTION-

"
Pulley
to
vibration
damper
..
.
.
.
....
22
Nm
(17
ft-Ib)



lf
the
camshaftsare
not
properly
timed,
the
1
pis-
tons
can
contact
thevalves
.
"
Vibration
damper
tocrankshaft
M16
stretch
bolt
(always
replace)
.
330
Nm
(244
ft-Ib)

CAMSHAFT
TIMINGCHAINS,
6-CYLINDER

20
.
Installation
of
remaining
parts
is
reverse
of
removal
.
When
installing
thermostat,
make
sure
arrow
or
vent
hole
faces
up
.
Refill
cooling
system
as
described
in
170
Radiator
and
Cooling
System
.

Tighteníng
Torques

"
Coolant
drain
plug
to
cylinder
block
.
..
.
.
.
...
.
..
.....
25
Nm
(18
ft-Ib)

"
Radiator
cooling
fan

to
coolant
pump
.
..
.
...
...
..
.....
40
Nm
(30
ft-Ib)

"
Radiator
drain
screw
to
radiator
....
2
.5
Nm
(22
in-lb)

Camshaft
timing
chainremovalon
6-cylinder
engines
re-
quires
that
you
Rmove
the
engine
oil
pan
by
raising
the
en-
gine
and/or
lowering
the
front
suspension
crossmember
.

Special
BMW
service
tools
are
needed
for
timing
chain
re-
moval
and
installation
procedures
.
The
special
tools
assure
proper
timing
of
the
valvetrain
.
Precise
marks
to
setthe
timing
on
the
camshafts
arenot
provided
for
reassembly
.
Read
the
procedures
through
before
beginning
thejob
.

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
.
.

9)
B11126

Fig
.
29
.
Lower
timing
chain
cover
mounting
bolts
(arrows)
anddowel
locations
(A)
.
Coolant
hose
fitting
B
is
replaced
by
coolant
pipe
pressure
fitting
in
later
models
.

28
.
Remove
remaining
Torx
bolt
from
timing
chain
guide
.

See
Fig
.
30
.

Fig
.
30
.
Timing
chainguide
mounting
bolt(A)
.

CAMSHAFT
TIMING
CHAIN



117-
11

29
.
Lift
primary
chain
sprocket
off
exhaust
camshaft
and
remove
chain
.

NOTE-

"
If
any
of
the
sprockets
are
being
replaced
due
to
wear,
the
chain
should
also
be
replaced
.

"
If
the
crankshaft
sprocket
requires
replacement,
the
oil
pump
drive
sprocket
and
chain
must
be
removed
as
described
under
119
Lubrication
System
.

Camshaft
timing
chains,
installing

(6-cylinder
engines)

Inspecttiming
chainsprockets
.
Sprockets
that
haveworn
or

missing
teeth
should
be
replaced
.
Inspect
guide
rail
and
ten-

sioner
rail
for
deep
grooves
caused
by
chain
contact
.
Replace
any
parí
that
is
worn
.

The
procedure
outlined
below
assumes
that
the
camshafts

and
the
crankshaft
are
locked
in
the
TDC
installation
position

with
special
tools
(shown
earlier
in
Fig
.
23
and
Fig
.
24)
.

NOTE-
NOTE-



On
pre-VANOS
engines
(engines
built
up
to
8-92),
the

"
The
timing
chain
cover
can
be
removed
with
the
cool-



camshaft
locking
tool
(Fig
.
24)should
be
raised
upon

ant
pump
installed
.



eitherside
by
3mm
(use
feeler
gauge
or
dril¡
bits)
.
Be
sure
the
clamping
bolts
on
tool
are
loose
and
thecenter

"
Use
care
when
removing
the
chain
cover
from
the



of
the
tool
is
contacting
the
cylinder
head
surface
.
This

coolant
pipe
or
hose
at
the
rearof
the
cover
.



service
campaign
helps
improve
idle
characteristics
by
reducing
valve
overlap
.

1
.
Install
primary
timing
chain
to
crankshaft
sprocket
and

tie
it
up
through
cylinder
head
opening
.

2
.
Using
new
gaskets
and
coolant
pipe
O-ring
;
insta¡¡
low-

ertiming
chain
cover
:

"
Drive
timing
cover
doweis
inuntil
they
just
protrude

slightly
from
sealing
surface
.
"
Apply
a
small
bead
of
silicon
sealer
(3-Bond
1209
©
or

equivalent)
to
corners
of
cylinder
head
where
timing

cover
meets
cylinder
head
and
engine
block
.

"
Tap
cover
into
position
to
engage
doweis
.

"
Install
mounting
bolts
hand
tight,
including
two
outer

Torx
bolts
from
above
.

"
Drive
doweis
in
flush
to
front
of
cover
.

"
Tighten
cover
mounting
bolts
alternately
and
in
stages
.

Tightening
Torque

"
Lower
timing
cover
to
cylinder
block

M7
................
...
..
.
.....
15
Nm
(11
ft-Ib)

M8
.............
.
.
...
.........
20
Nm
(15
ft-Ib)

3
.
Insta¡¡
oil
pan
using
a
new
gasket
.
See
119
Lubrication

Systern
.

CAMSHAFT
TIMINGCHAINS,
6-CYLINDER

117-
1
2



CAMSHAFT
TIMING
CHAIN

4
.
Mount
primary
timing
chain
sprocket
to
primary
chain

so
that
arrowon
sprocket
faces
up
.
Mount
sprocket
to

camshaftso
that
tapped
holes
in
camshaftare
on
left

side
of
elongated
holes
in
sprocket
.
See
Fig
.
31
.

NOTE-

On
engines
built
beginning
from
March
1995,
the
VANOS
intake
cam
sprocket
assembly
was
updated
to
ínclude
a
spring
plate
and
two
thrust
washers
.
See
Fig
.

Fig
.
31
.
Primary
timing
chain
sprocket
correctly
alignedto
exhaust



33
.
camshaft
.
Elongated
sprocket
holes
should
be
aligned
to
left
side
of
threaded
camshaft
holes
.

5
.
On
1993
and
later
engines
:Install
BMW
special
tool
no
.
11-3
390
into
primary
timíng
chain
tensionersleeve
.
Thread
toolin
finger
tight
until
slack
is
removed
from

chain
.

"
Check
that
elongatedholes
in
primary
sprocket
are

centered
to
bolt
holes
in
camshaft
and
chain
is
free
of
slack
.

NOTE-

BMW
special
tool
no
.
11
3
390
ís
a
dummy
primary
chaín
tensioner
and
simulatesthe
function
of
the
hy-
draulic
tensíoner
.

7
.
Install
cylinder
identification
trigger
píate
to
front
of
in-

take
camshaft
.
On
1993
and
later
engines,
instanthrust
washer
tofrontof
intake
camshaft
.

CAMSHAFT
TIMING
CHAINS,
6-CYLINDER

B11136

Fig
.
32
.
Secondary
chain
sprockets
being
installed
.
Attach
sprockets
with
arrows
pointing
up
and
elongated
holes
centered
to
threaded
holes
in
shaft
flange
.

6
.
Install
primary
timing
chainguide
and
secondary
chain
tensioner
.
Tighten
mounting
bolts
.
(Tensioner
remains



Fig
.
33
.
VANOS
spring
plate
and
thrust
washers
on
engines
built
3/95locked
down
for
now
.)



and
later
.

10
.
On
1993
and
later
cars,
tighten
nuts
at
intake
camshaft
sprocket
.

8
.
Insta¡¡
secondary
chainsprockets
and
chain
asan
as-
sembly
so
that
arrows
on
sprockets
are
pointing
up
.



Tightening
Torque
(1996
and
later)

Centermounting
holes
in
sprockets
tobolt
holes
in



"
Intake
camshaft
sprocket
nut
camshafts
.
See
Fig
.
32
.



to
stud
(M6)
.............
.10t
1
Nm
(89
±9
in-lb)

9
.
On
1993
and
later
engines
:
Insta¡¡
thrust
washers
and
spring
plate
(where
applicable)
to
intake
cam
sprocket
.



11
.
On
1992
engines
:
Insta¡¡
primary
chain
tensioner
so
that
cutout
in
tensioner
piston
engages
chain
rail
.
See
Fig
.
34
.
Check
that
chain
is
free
of
slack
.