140
d. Install a small sheet metal screw part
way
into
the seal and
pu
ll
the seal out with a pair
or
pliers.
NOTE
If
bearing repfacemem is required,
purchase the
new
bear;ng(s)
and
place
them in a freezer
for
approximately 2
hours before instaflOlion. Chilling the
bearings will slighlly reduce their
overall
diameter
while the hot
crankcase
is
slightly larger due
to
heal
expansion. This will make bearing
installalion much easier.
3.
On
bearings so equipped. remove the
sc
rews
(Figure 282) securing
the
bearing retainer.
RcmQ\lC
the bearing retainer.
WARNING
Prior
to
hearing the crankcase
half
as
described
in
Step
3,
first wash the
crankcase Ihoroughfy in soap and
water. Make sure there is
no
gasoline
or solvent fumes present.
CAUTION
Even
though the crankcase has been
washed,
ther~
may
b~
a
r~sidual
oil or
solvent odor
I~ft
in
th~
oven after
heating the crankcase.
If
you
us~
a
household
oven, first check with the
person
who
uses
tire
o~'en
for food
preparation
to
a~'Oid
getting into
trouble.
4. The bearings are installed with a slight
in
terference fit. The crankcase half
mu
st
be
heated
in
an oven to a temperatu re of about
100
° C (212°
F). An easy
way
to check the proper temperature
is
to drop tiny drops
of
water on the case: if they
sizzle and evaporate immediately, the
temperalUre
is
correct.
CAUTION
Do
not heat
th
e cases with a torch
(propane or
acef)'len~);
never bring a
CHAPTER FOUR
flame into
cO
n/aC!
lI'ith
the betlrillg
or
ca.fe.
77le
direct hem
lI'iII
llestroy the
case hardening
of
the bearing and
lI'iII
likely cause lI'arpage
of
the case.
WARNING
H-
~ar
insulated gloves
(i
llsulated
kitchen
milts)
when
IUlI1dling
healell
parts.
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