Table of Contents
Advertisement
Inspection nnd adju.tment of engine proper
Valve
c1eamnee
adjuslIMnl
The valve clearance specification
for
this
engine
is 0
.25
mm
(0.0098 In.)
for
boUt
inlake
end exhaust
valves.
This value assumes that
the
engine
is
at
normal tempera·
ture
,
th~re
being
no temperature
difference
throughout
the
bndy of
the
engine
.
The
<hocking
and
adjusting
procedure
is as
follows
:
(I) Rotat. the
crnnk.h.ft
slOWly
10 bring the piston in
No
.
I cylinder
to
Top
De.d
Cenler
(TDC).
This
can
be
accomplished
by
obse
rving
ro
cker
3TmS
of
No
.4
cylinder.
As
you
turn
the
crankshaft
,
exhaust-valve
rocker
arm
of
this cylinder
rises:
SlOp
tu
rning
the
crankshaft just
when
intake·valve rocker
ann
begi
ns
to
go
down
after exh aust val ... e rocker
arm
has
oome
up
aU
Iho
way
.
Undel
this
condi·
tion
,
adjust
valve clearance
in
the usual manner
on
intake and exhaust valves
of
No.
1 cylinder,
intake
valve
of
No.
2
cylmder,
and
,xh.USI valve of
No.
3
cy
lindeI.
(2)
Turn
the crmkshaft on.
complete rotation
(360'
),
and
hold
it
th.re.
Adjust
the
clearance on intake
and
exhaust
valves of No.4 cylinde
r,
exhaust valve
of
No.
2 cylinder,
and
intake valve of
No.3
cylin·
der.
Adjusting valve clearance
Fan bell teslon
adjustment
Give
a
Ihumb
pl.ssure to
the middle section
of the
bell
becwe.n alterna
tor puOey
and
waler
pump
pulley,
and
s ••
how
much
this
pOltion
of the
belt
den.cts
by
measuring with
a
rule.
The
denection
should be
12
mm
(J
/2
in.):
if
nOI
,
loosen the mounting
bolts
of the
altematoi holder to
displace
the holder
in
order
LO
.Igbten
or slacken Ih. bell
.
Afler
obtaining
the prescribed
amount
of
deflection
,
be :sure
to tighten
the bolts good
and hard
.
MAINTENANCE
AND
ADJUSTMENT
12
mm
(1/2
in .J
(1)
CD
®
,
·Alt
e-rnatOl'
pull
ey
3·F
en
pulley
!water pump
P\jlley)
2-C
r!nks~h
pullev
Fan be
lt
te
ns
ion
Crankcase
Crankcase
inspection
(1)
(llSpect the
outside
.and
inside surfaces fo
r
evidence
of
cr:u:king. Visually
examine
Ihe
cylindel
bores
for
SCUifU1K,
rusting,
erosion
or any
abnonnal
wear.
Using
a
straightedge,
check
the top fac.
(for
mating
with
cylinder head)
,
front
face
(fo
r
mallng
with front
plale)
and
lear
face
(fol
mating
with
rear
plate)
for
flatness.
Checki
ng
c
rankcase
top for
flatness
(2)
Make sure thai
the top
face of the crankcase
is
Oat
within
the repair limit
speci
fied
below.
If
the
limit
is
found
to
be
exceeded,
refac. Ihe
top by
usmg
3
surface
grinder
to
make
it
flat within the
specified
flatness
. Be cartful
not
to remove any
more
stock than is
necess.ary
~
if
3
stock of more
than 1
mm
(0.039
in.) has to
be
ground
off,
then
the crankcase is done for.
Uni
t:
"
mm
(in
.
1
Item
Standard
Repai
r
limit
Flatness of crankcase
0.05
,
max.
0.2mm
top
face
(0.002)
(0.008)
47
Advertisement
Table of Contents
