Group 27 Reconditioning engine
Cylinder
head, assembJy
G.
Cylinder
head,
assembly
New
cylinder head
Important
• New cylinder head
must
be
the same type
as
the old.
Cylinder
heads designed
for
use
with
M
12
balts
must
nO
l
be
used
with
M
11
balts.
Cylinder heads
ca
n be identified
as
follows
(see iIlus·
tration
at
left);
-
Number
series followed
by
B = M
11
-
Number
series
followed
by
C = M
12
• USAfCanada
1982-
has a
different
type
of
cylinder
head and swirl chambe
r.
Swirl chamber and ils bare
is
2
mm
(0.080 in) smaller in diameter Ihan other
types.
New
cylinder
head
Operation
G7
Install oil jats and pin studs
in
cylinder head
Carefully tap in oil jets using a brass punch.
Gl
Not
el
Turn outer jets
to
poi
nt
across
cylinde
r head,
see
fig.
Importanti
Check
specification
and
type
of
cylinder
head. M
12
bolts
must
not
be used
wi
th M
11
bolts.
Different
type
cyl
inder
heads are used
for
USAf
Canada.
G2
Check valve stem
position
in
relation
to
camshaft
This
measurement
is
carried
out
to ensure
that
there is
sufficient
adjustment
lanitude
for
valves.
Pl
ace
gauge 5222
with
largest
diameter
ring, on
cylinder head. (Small ring is
for
817
-823
engines).
Notel
Front
bearing
recess
diamete
r is larg er
than
others. Make sure
thai
gauge
is
positioned
correctl
y.
Taking each valve
in
turn,
check
that
stem
doe
s
not
contact gauge. If
this
happens,
grind
valve stem.
51
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