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Fig
EM 3
Crankshafl
PISTON AND
CONNECTING ROD
The
pistons
are
of
a
special
alumi
num
casting
and
have struts to
control
thermal
expansion
two
compression
rings
and
one
combined
oil
ring
The
piston
heads
are
slightly
dished
The
piston pil1S
are
a
special
hollow
steel
shaft
They
are
full
floating
fit
to
the
piston
and press
fit
to the
connecting
rods
The
connecting
rods
are
of
a
special
forged
steel Oil
is
sprayed
to
the
connecting
rod small
ends
through
drilled passages
in
the
large
ends of
rod
Oil holes
in
the
connecting
rods
are
located
so
as
to insure
optimum
lubrication under
heavy
load
0
5 0
1
o
E
Moao
Fig
EM
4
Piston and
connecting
rod
CYLINDER HEAD
The
cylinder
head
is
made
of
a
light
strong aluminum
alloy
with
good
cooling efficiency
it contains
wedge
type
combustion chambers
A
special
aluminum
bronze valve
seat is
used
on
the intake valve while
a
heat
resistant
steel
valve
seat
is
installed
on
the
exhaust valve
These
parts
are
all hot
press fitted
EM407
Fig
EM S
Cylinder
head
Engine
Mechanical
CAMSHAFT
The camshaft
is
made of
a
special
cast
iron
and
is
located inside
the
rocker
cover
Four
aluminum
alloy
brackets
support
it
Camshaft
bearings
are
lubricated from oil holes which
lead
to
the
main
oil
gallery
of the
cylinder
head
Concentric
passages
are
drilled
in
the
front
and
rear
parts
of the
earn
shaft
Oil
to
each
earn
lobe is
supplied
through
an
oil
hole drilled
in the base
circle of each lobe
Lubricant
is sup
plied
to
the front oil
gallery
from the
2nd camshaft
bearing
and
to
the
rear
oil
gallery
from
the
3rd
camshaft
bearing
These
holes
on
the base
circle
of
the
lobe
supply
lubricant
to
the
earn
pad
surface ofthe rocker
arm
and
to
the valve
tip
end
The
cams
feature
a
long overl a p
profile
to
reduce NOx
emission
Fig
EM 6
Camshafl
VALVE MECHANISM
The
valve
system has
the
pivot
type
rocker
arms
that
are
activated
directly
by
the
earn
mechanism
this has made
its
moving parts considerably lighter
and
provides
ideal
high speed
perform
ance
Dual
type
valve
springs
are
in
stalled
h
@l
if
Exhaust
Intake
EM084
Fig
EM
7
Valve mechanism
EM
3
CAMSHAFT
DRIVE
The camshaft
is driven
by
a
double
row
roller chain
driven
by
the crank
shaft
The
tension
of the chain
is
controlled
by
a
chain
tcosioner
which
is
operated by spring
and oil pressure
The rubber shoe type
tensioner
damps
vibration
of
the
chain and controls
its
tension
EM537
Fig
EM 8 Chain
driving aystem
MANIFOLDS
The intake manifold
is
of
an
alumi
num
cast
alloy
The
exhaust
manifold
is
of
a
dual
design
and
incorporates
a
heat control
valve in it
The
heal control valve
is
used
to warm
the
intake
manifold
A
plate
is
installed
on
the
outer
face
of the manifold
to
draw hot
intake
air out
through
it
The
exhaust
pipe
is
connected
to
the
flanged
sur
face of the exhaust manifold
Fig
EM 9 Intak
and exhaust
manifolds
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