102
CAUTION
1/ the
\'Oh'e
slem end has been
resurfaced,
make
SIIre
that the
\'ah't.'
stem/ace
(A. Figure 138) is above the
\'all't.'
retainers (B, Figure
138
).
9.
Repeat for the other valve assembly.
10.
In
stall the cylinder head as described
in
this
chapter.
Vah'e Guide Replacement
When valve guides are worn so that there
is
excessive valve stem-to-guide clearance
or
va
l
ve
tipping. the guides mu
st
bc
replaced. Th
is
job
should
on
ly be done
by
a dealer as special
100
ls
are required as well as considerable expenise. If
the valve guide
is
rep
la
ced: also replace the
respective valve.
The
following proced
ur
e is provided if you
choose to perform this task
yo
ursel
f.
CAUTION
TIlerI.'
may
be a residual
oil
or
sO/\'f.'nI
odor left in the
OI'en
after
healing
the
cylinder head.
Il
roll use a
ho
usehold
CHAPTER FOUR
3.
Remove the cylinder head from the oven and
hold onto
it
with kitchen pot holders. heavy gloves
or heavy shop cloth
s-
it
is very h
OI.
4. While heating up the cyli
nd
er head. place the
new valve guides
in
a freezer (or refrigerator) if
possible. Ch
ill
ing them will slightly reduce their
A 8
oven, first check with the person who
Arl
uses the o\'en
for
food
preparation to
~
avoid gelling into trouble.
I. Remove the screws securing the intake pipe
(Figure
139
)
Onto
the cylinder head. Remo
ve
the
intake pipe before placing the cylinder head
in
the
oven.
2.
The
va
l
ve
guides (Figure
140
) are installed with
a slight interference fit.
Place the cyl
in
de
r head
in
a heated oven (or on a hot plate). Heat the
cy
linder head to a temperature between
100-150°
C
(2
12-
300
° F). An easy
way
to check the proper
temperature is to drop tiny drops
of
water on the
cyl
in
der head: if they sizzle a
nd
evaporate
immediately. the temperature is
correc!.
CAUTION
Do
nOI
hem the cylinder head with a
lorch (propane
or
a
ce
tylene); ne\'er
bring a flame into contact with the
cylinder head
or
\'O/w
! guide.
The
direct heat will destrqy the case
hardening
of
the
mlve
guide and wiff
likely ellllse warpage
qf
the cylinder
head.
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