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24
Fig. 3. 30
Cam follower
and
cam follower
shaft
Fig. 3. 31
Tappet clearance ad
iusting
mechanism
(D
The
clearance
is maximum
®
Adiusting
range
@
The clearance
is
minimum
--- ·-
Fig.
3.32
Cam follower
ond Cam follower
shaft
©
Cam follower
bearing diameter
®
Cam
follo
wer
shaft
iournal
3.
ENGINE
The tappet clearance con be
easily
adjusted by
turning the cam
follower
shaft
which
is mounted on
an eccentric.
(Fig. 3. 30, 3. 31)
The fea ture
of this valve mechanism simplines and
lightens the operation of the
valve
and also
reduces
the load
on
the valve
spring, making
it
suitable for
high speed operation.
Slipper surface of the
cam
follower is mode
wear
resistant
by welding a stellite facing.
The toppect
clearance
is
0.03 mm (0.001 2 in)
between
the
com and
the
cam follower
slipper
surface.
G.
Camshaft
and Cam Follower
Disassembly
Remove the
cy
linder head in accordance
with
Section
3.2B.
Inlet side.
1.
Remove the
cam
fo llower
shaft lock nut from
both the
right
and
lef
t
side.
2.
Remove cylinder
head side cover from
both
the
right
and left side.
3.
Remove
inlet camshaft.
Exhaust side
l.
Loosen the
lock nut from
the
right side and
remove
the
tachometer gear box.
2.
Remove the contact
breaker
point cover.
3.
Loosen
the
lock
nut and remove the contact
breaker assembly.
4.
Remove the
spark
advancer
and the breaker
point base.
5.
Remove
the
exhaust
camshaft.
H.
Inspection
l.
Camshaft
(Fig. 3. 32, 33, 34)
I
Item
I
Standard
value
I
Serviceable
limit
'
I
Cam_
follower
I
1 0 _
20 _ 10 _ 218 mm
I
Replace if over
l
I
bearing d1amter
IO
4016 _ 0 4023 .
'I
l
0.28
mm
Fig. 3. 32
(D
·
·
·
,n
10.4047 inl
I
Cam
followe.:--j
1
0
_ 166 _ 10
_
184 mm
,
Replace
if
under
2
shaft 1ournal
f
l0
. 3992 _ 0 _ 400
9
in),
10.10
mm
,
F,g.
3. 32
@
·
10.3976
,n)
Camshalt
I
21.967-21
.980
mm
l
Replace if under
3
journals,
inlet
i
10.8648-0.8654
in)[
21.92mm
a,,d
exhaust
10.8622 in)
Cam lift.
inlet
I
-
-I
Replace
if
under
4.688-4.728
mm
4
,
and exhaust
,
1
0.1846-0.1853
inl!
4.65mm
Fig.
3. 33
10.1830 inl
-
-
,
Breaker
point
I
0.01 mm max
I
Replace if over
5
shaft
runaut
10.0004
in)
I
0.05mm
Fig. 3.
34
10.002 inl
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