Group 21 Engine
Cylinder head,
assembly
G. Cylinder
head, assembly
New
cylinder head
a New cylinder head
must be the same type as the
old. Cylinder
heads designed for use with lvl 12
bolts
must not be used with
M
'11
bolts.
Cylinder heads can
be identified as follows
(see
illustration
at left):
Number
series followed by B
=
M 11
-
Numbe.
series followed
by C
=
M 12
LJSA,/Canada
1982- has
a
different
type of cylin,
der head
and swirl chamber. Swirl chamber
and
its bore is
2 mm
(0.080
in) smaller in diameter
Newcylinderhead
Opetationcl
cl
Install oil
ieis
and
pin
studs in cylinder head
Carelully tap in oil
jets
using
a brass
punch.
Note! Turn outerjets to
point
across cylinder head,
see
fis
lmportantl
Check specification ;nd
type of cylinder
head. M
'12
bolts must not be
used wirh M 11 bolts.
Differenttype
cylinder heads are used for LJSI,/Canada.
G2
Checkvalve stem
posilion
in relationto
camshaft
This measurement
is carried out to ensure thatthere is
sufficient adjustment lattitude for
valves.
Place
gauge
5222
with largest
diam€ter ring, on cylin-
der he8d.
(Small
ring is for B 17-B 23 engines.)
Notel F.ont
bearing recess diameter'is larger than
others. Make sure that
gauge
is
positio.ed
correctly.
Taking each va,ve in
tu.n, check that stem does not
conlact
gauge.
lf this happens,
grind
valve
stem.
Vslve length, mm
{in}
New Min
Intakeva1ve...................'104.8
(4.126)
104.3
(4.106)
Exhaustvalve................'104.6
(4.118i
104.1
(4.0981
4l
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