138
if
it
ha
s excessive
si
de play (Fig
ur
e 2
73
).
If
the
bearings a
rc
okay. oil the races and balls with fresh
engine oi
l.
If necessary. re
pl
ace the bearings
as
described in
th
is chapter.
S. Inspect the cam chain drive sprocket (Fig
ur
e
274) for wear. damage or
mi
ssing teeth . Replace
if
dama
ge
d.
9.
In
spect
th
e primary drive gear
(F
ig
ur
e 275) for
wear. damage or
mi
ss
in
g teeth. Replace
if
damaged.
10
. Measure the inside diamet
er
of
the
co
nnecting
rod
small end (Fig
ur
e 276) with
an
inside
m
ic
rometer. Compare to dimensions
li
sted
in
Table
I.
]f
worn to the service limit dimension
or
greater.
the crankshaft assembly
mu
st
be
replaced.
IIA
.
If
spccial lools a
re
not
avai
la
bl
e, check
th
e
condition
of
the connecting
rod
big end bearing
by
g
ra
sping the
rod
in
one hand and lifting up on it.
With the
he
al
of
your other hand, rap sharply on
th
e top
of
the rod . A sharp metallic so
un
d, such
as
a cl
ic
k. is
an
indicat
io
n
th
at the bearing
or
cr
an
kpin
or
both arc worn a
nd
the crankshaft
assembly should
be
replaced.
lIB
. If s
pe
cial tools arc available, place the
crankshaft assembly on V-blocks.
Place a dial
indicator against the
co
nnecting rod sma
ll
end
(Figu
re
277). Move the
co
nnecting rod back and
fo
rth; note
th
e reading and
co
mpare
to
the
dimension
li
st
ed
in
Table
I.
Replace the cra
nk
shaft
assembly if worn
to
the service limit dimension
or greater.
12
. Place the crankshaft assembly with
th
e bearing
jo
urnals resti
ng
on V-blocks and check the runout.
Pla
ce a dial indicator against each e
nd
of the
cr
an
kshaft (Fig
ur
e 278). Slo
wl
y rotate the
cra
nk
shaft. Note the reading at each end and
@
Play
+
Illil:
T
r--
Ploy
J(l
Ll1.
CHAPTER FOUR
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