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
