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PART 1-1
-ENGINE
13
A1561-A
FIG. 3
-Intake
Manifold Coolant
Passages
haust
gases
provide
the
initial heat
necessary
to
assist
in vaporizing
the
incoming
fuel
mixture.
The intake
manifold
has
two
sets
of
fuel
passages,
each
with
its
own
separate
inlet
connection
to the
car
buretor (Fig. 4). The
right
barrels
of
the
carburetor
feed Nos.
1,4, 6,
and
7
cylinders
and
the
left barrels feed
Nos.
2, 3, 5,
and
8
cylinders.
The distributor is
mounted at
the
left front
of
the
intake
manifold.
Warm
air
for
the
automatic choke
is drawn from
the
heat
chamber of
the
right
exhaust manifold
(Fig. 5).
CYLINDER HEADS
The
cylinder
head
assemblies con
tain the
valves and
the
valve
rocker
arm
shaft
assembly.
The
combus
tion
chambers
are
machined
in
the
head. Valve
guides
are
an
integral
part of
the
head. The
valves are ar
ranged
from front
to
rear
on
both
banks
E-I-E-I-I-E-I-E
(Fig. 6).
CYLINDER
BLOCK
The
cylinders
are numbered
from
front
to rear,
on
the
right
bank
1, 2,
A1243-A
FIG.
4-lntcke
Manifold Fuel
Passages
AIR
INLET
AIR
OUTLET
TO CHOKE
A
AIR HEAT CHAMBER
A
1206-
A
i.
5
Automatic Choke Heat
Chamber
3
and
4
and on
the
left bank
5, 6,
7
and
8. The
firing
order
is
1-5-4-2-6-3-
7-8.
The
oil
pump,
mounted
inside
the
oil pan at
the
front,
is driven
by
the
distributor
through
an
intermediate
drive
shaft.
The
crankshaft
is
supported
by
five
main
bearings. Crankshaft
end
thrust
is
controlled
by
the
flanges
of
the
No. 3
main
bearing.
The
pistons
have
two
compression
rings
and one
oil control ring.
The
top
compression
ring
is
chrome-
plated
and
the
lower
compression
ring
is
phosphate-coated.
The
oil con
trol
ring assembly
consists of a ser
rated
spring
and
two
chrome-plated
steel rails.
VALVE OPEN
LIFTER BODY
A1244-A
FIG.
6
Valve Port Arrangement
VALVE TRAIN
The intake
and
exhaust valve as
semblies are
the
rotating-type
which
rotate
each
time the
valve opens and
closes.
The
push rods are solid steel with
oil cushioned sockets.
The
camshaft
is
supported
by
five
bearings
pressed
into
the
block. It is
driven
by
a sprocket and
timing
chain
in
mesh with a sprocket on
the
crank
shaft.
Camshaft
end
play is
controlled
by
a
thrust
button
and
spring
located
between
the
camshaft sprocket
bolt
and
the
cylinder
front
cover.
An
ec
centric,
bolted
to the
front
end of
the
camshaft,
operates
the
fuel
pump.
Hydraulic
valve
lifters
are
used
which provide zero
valve
lash. The
operation
and parts
identification
of
the
hydraulic
valve
lifters
are shown
in Fig. 7.
When
the
valve
is
closed,
the
lifter
assembly is
on
the
base
circle of
the
camshaft
lobe
and
the
valve push rod
is in its lowest
position.
With
the
lifter assembly in
this position, the
plunger
spring
expands
forcing
the
plunger upward.
This
action
is
trans-
VALVE
CLOSED
DISC VALVE
CAMSHAFT
d^
BASE CIRCLE
CAMSHAFT
FIG.
7
Typical Hydraulic Valve Lifter Operation
A1245-A
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