AiTb
....
ther
The breatJler for
letting
fresh air into
nnd
letting
out
fumy
air
from the crankcase
is
loc,ated
On
thoe
fight-hand
side
of
the engine. It prev
ent
s the pre
ss
ure inside
the
crankcase
from
building
up
and thus minimizes t
he
amount of
lube.
oil
gcltLn&
into the combus
ti
on
ch
am-
bers.
Cylinder
head
'
~:
D
®~il
® t
Air breather
,
/ .,
l
..R.
oc
ker covar
2.cyllnoer
tu:mo
bolt
3-CyllnQer
head
4-Gasket
S·Pnrcon1bu",1ion
ch9mbef
jEll
6.v~1
...
e
USl
Cylinder
hil:l'ad
CONSTRUCTION
AND
FUNCTION
Cylinder
head
The cylinder
head
is , 'ingle·piece ,
..
ti.ng, elaborately
jacketed
for
improved
cooling
and
also
ror
greater
S{rtlClura
] rigidity. Exhaust
pOTts,
intake ports and pr
e-
combustion
chambers,
each numbering fOUl, arc cast
out
inside
the:
head. The exhaust ports open out to the right,
and the intake
ports
to the left.
A total
of
17
bolts
secure
the
cy
linder
head
to
"'.
cylinder block. The positions of these
bolls.
are
se
que
n-
tially referred to in
the
tightening
procedure
, and are
numbered
sequ
en
tially, starting wIth "1 " and ending
wi
th
"17"
as shown.
Fcwvtrd
~
Tl9ht~ning
sequence
Precgmbustion
chambers
The precombustion chamber
Is
formed
wi
th (I cast-out
space and
an
orifice piece - prec
ombustion
chamher jet
- fitted
into
the
cylinder head
from
its.
g-asketed side.
The shapes
of
the
piston
crown
iln[j
the
commun
ic
ating
orifice are snch
as
to produce good turbulence c
...
-en
when the engine
is
ruTUling
slowly . The glow
p1U8,
sticking
oul
into
the ante chamber -
pr~combustjon
chamber - right beside
the
inJeclion nozzle
is
a st
ar-
ting
aid
in
cold
weather
.
Cylinder
head
gllSket
The gasket for sealing the
joint
between
cylinder head
and
cyhnder
block
is
es:sentially
an
asbestos insulator
sandwiched
between
two
thin steel sheets,
with
its
-combustion
chamber
holes. being edged in
apron
fashion
by stainless
:;ted
grommets.
The:
bottom
surface
in
contact with. the cylinder block
is
cO:3ted
wi
th
II
special
sealing compound
for
improved sealing effect.
Rocker cover
The
rock
er
cover is aluminum alloy in material.
V shotS,
....
alve seah;
and
springs
The lntake
valv
~
has Its disc
s.ized
:i
s large
as
possible for
incr
eas
ed
suction
tfficiency
.
The material
of
valves
is
heat·resislant steel having good
hot-hardness.
This steel used
in
exhaust
valves is of ;I
special
kind
havillg
extra
high resistance to high·temper-
atUre'
creepi
ng,
burning
and oxidation, f
atig.ue
an
thenna.]
shock
.
Elich valve guide
is
fitted
with a stem seal
to
prevent
lube oil fr
om
e
ntering
the
combustion chamber.
17
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