rear BMW 328i 1997 E36 Owner's Guide

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

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

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

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

M42
Engine

CL
(EM

Fig
.
11
.
Two
versionsof
hydraulic
chaintensioners
.
Original
chain
ten-
sioner
on
M42
engine
(top)
canbe
disassembled
.
Chain
ten-
sioner
on
M44
engine
(bottom)
cannot
be
disassembled
.
Note
differences
in
outer
sleeve
.
Also,
the
M42
tensioner
de-
tent
ring
groove
is
visible
when
tensioner
is
extended
(arrow)
.

Outer
sleeve
Spring

0013024a

Detent

ring

9
.
On
M44
engines
:
Clamp
tensioner
piston
in
vice
(soft

jaws)
and
squeeze
oil
from
it
.
Slowly
compress
piston

only
up
to
end
círclip
.
Repeat
procedure
twice
to
ensure

al¡oil
is
expelled
.
See
Fig
.
13
.

10
.
Insta¡¡
hydraulic
chain
tensioner
lo
cylinder
head
.
Usea
new
sealing
washer
on
tensionerplug
when
installing
.

Tightening
Torque

"
Chain
tensioner
to
cylinder
head
....
40
Nm
(30
ft-Ib)

11
.
On
M42
engines
:
Release
early-style
chain
tensioner
by
pressing
chain
guide
against
tensioner
until
it
un-

locks
and
expands
out
.

CAMSHAFT
TIMING
CHAIN



117-
5

0012507

Fig
.
13
.
When
reinstalling
chain
tensiones,
oil
in
tensioner
piston
must

first
be
expelled
by
compressing
piston
in
vise
.
When
com-
pressing
piston,
only
compress
up
to
and
circlip
(arrow)
.

Tightening
Torque

"
Chain
sprocket
lo
camshaft
flange
(M6)
..
.
..
.............
.
..
10
Nm
(89
in-lb)

13
.
Remove
crankshaft
locking
tool
from
bellhousing
and

camshaft
locking
tool
from
rear
of
cylinder
head
.

14
.
Install
lower
timingchain
cover
:

"
Insta¡¡
new
crankshaft
oil
seal
in
cover
.

"
Use
new
gaskets
when
installing
cover
.

"
Thoroughly
clean
profile
gasketgroove
and
all
gasket

sealing
surfaces
on
lowerchaincover
.

"
Apply
a
small
bead
of
silicon
sealer
(3-Bond
1209
or
Snap



equivalent)
lo
joint
corners
where
chaincover
meets

ring



0013024



head
and
block
.
See
Fig
.
14
.

"
Tap
cover
into
position
to
engage
locating
dowels
.

Fig
.
12
.
Disassembled
early-style
chain
tensioner
usadon
M42
en-



"
Tighten
cover
mounting
bolts
alternately
and
in
stages
.

gine
.

12
.
Check
that
chain
is
now
free
of
siack
.
Tighten
down

sprocket
mounting
bolts
.



where
chain
cover
meets
head
and
block
(arrows)
.
Fig
.
14
.
Apply
sealer
(3-Bond
1209
0
or
equivalent)
to
joint
corners

CAMSHAFT
TIMING
CHAIN,
4-CYLINDER

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
.
.

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

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
.

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