CONSTRUCTION
AND
FUNCTION
A
spe
ci.
1 he.,·resistanl
m31er
ial
of
high·durability lype
is
used
in
the
valve
seats
of
both
intake
and
exhausL
v!.!ve
s.
each
\'
.Iv,
is
loaded
by
a single c
oil
spring, whose lums
3
are spaced .par! wi
th
equal pilch.
The
valve
stem end
is
capped; the cap is Ul COntact with
the
rocker
arm
and
serves
as
the
wearing
member.
IS)
(11
4
~\:
It'!.
. @
,
@
~::~8~
; ,
1 I
8~()
Ii
II
I
~;\
@f----'
'20
a·Valva
~at
9-Racker
COvel
15-Sprlng
16.v
..
11J!
stem ssal
'
·lock
r
ut
2·Adlustio9 screw
J-Valv.
DUm
rod
4-C
vll
nder t,I!Bd bot,
S-Rocku
br~e&l:e,
&Va
lve guidll
7·
e""hi
unt
'111'10'8
1
O·R
oekt1'
,I'm
"·R
ocker
ShDft
12-Sprlng
rltrl!llnllt
13-V,I'/e
Ci(l
14-VOrye eO(!er5
17..(i(
ow
plug
19·Fuot ltlllc-off
pipe
19·No.:tle
2O-evljpoor
head
21·Pre
combuu
l
on
eh..-nber
jet
Cvlinder h
ead
- Cress section
Rocker arms, shaft and bracket.
Th
e
rocker
arm
is
a
forging
.
Its
tip
ror
psessing down
the
valve
s[em
is
induction-hardened
for
increased
res
istance
to
wear,
It'
bore for admitting the rocker
'haft
is bush·
ed; Ih. bushing
is
lead bronze in malerial.
24.5
36.
3
Rocker
arm
The
rocker
shan
is
hollow; one end of it
is
plugged
while
the
ot
he
r
end
admits
l
ube
oil
for
lubricating
the
rocker
arms. The exte
rn
al
surface
of
this shaft
is
hardened
by
mtnding
at
low
temperatures.
'The
four
ro
cker
brackets
are
al1uminum
alloy
cashngs
shaped identically,
18
Main
moving parts
Crankshaft
The
cran
kshaft
B a sjng!e-piece
forging
complete with
balance
weights
_
Its
j
ournals
and
crankpins
are
sized
J
arge
10
increase
its rigidity .
and
are case-hardened
by
Induction heating,
Flywheel
The c""l·iron flywheel carries the pilot ball bearing for
holding
th
e forward end
of
clutch shaft. The flywheel
is
doweled to the crankshaft and secured by four bolts,
Ring
gear
T
he
ring
geat
is
of a
high
car
b
on
steel, its
gea
rs
are
hardened
by
induction heating, The ring itself
is
shrink·
fitted to
the
flywheel.
Th
ere
are
132
gcar
teelh, each
loath
being chamfered at its
end
faci
ng the slarler drive
pinion
in
or
der
to
fa
cilitate the meshing action
of
the
pinio
n.
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