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Datsun 1000 User Manual

Datsun 1000
224 pages
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mixture
is
drawn
into
the
engine
where
it
is
incompletely
burnt
resulting
in
excessive
carbon
monox
de
and
hydrocarbon
exhaust
emission
The
throttle
opening
device
is
designed
to
open
the
carburettor
throttle
valve
whenever
these
coasting
conditions
exist
This
allows
an
adequate
fuel
air
mixture
to
be
drawn
into
the
engine
where
proper
combustion
takes
place
therefore
reducing
the
level
of
hydrocarbon
and
carbon
monoxide
emission
The
basic
components
of
the
throttle
opening
device
are
Control
Valve
Servo
diaphragm
Interconnecting
tubes
When
deceleration
takes
place
and
inlet
manifold
vacuum
increases
the
control
valve
opens
permitting
manifold
vacuum
to
be
routed
to
the
servo
diaphragm
vacuum
chamber
As
shown
in
the
diagram
the
servo
diaphragm
assembly
is
mounted
on
the
carburettor
and
is
connected
to
the
throttle
lever
through
Iinkage
Applied
vacuum
actuates
the
servo
diaphragm
and
linkage
to
the
carburettor
thus
slightly
opening
the
throttle
valve
to
the
desired
degree
As
manifold
vacuum
lowers
to
a
predetermined
level
due
to
the
vehicle
speed decreasing
the
con
trol
valve
begins
to
close
The
control
valve
closing
aBows
the
inlet
manifold
vacuum
to
be
maintained
at
the
constant
predetermined
level
An
altitude
corrector
is
built
into
the
control
valve
body
and
is
adjusted
to
a
slight preload
to
compensate
for
any
variation
in
atmospheric
pressure
This
system
does
not
effect
engine
braking
which
is
normally
desired
during
deceleration
CONTROL
VALVE
To
Remove
I
Raise
the
engine
bonnet
2
Disconnect
the
inlet
manifold
to
control
valve
vacuum
tube
3
Disconnect
the
control
valve
to
servo
diaphragm
vacuum
tube
4
Loosen
and
remove
the
two
control
valve
assembly
attaching
bolts
at
the
inlet
manifold
5
The
control
valve
assembly
can
now
be
removed
from
the
engine
compartment
NOTE
It
is
not
practicable
to di
mantle
and
repair
the
control
valve
If
the
unit
is
malfunctioning
then
renew
the
valve
as
an
aHem
bly
To
Instal
I
Position
the
control
valve
back
in
the
engine
compartment
on
the
inlet
manifold
2
Instal
and
tighten
the
control
valve
assembly
attaching
screws
Emission
Con
trol
B
3
Connect
the
inlet
manifold
to
control
valve
vacuum
tube
4
Connect
the
control
valve
to
servo
diaphragm
vacuum
tube
5
Check
the
operation
of
the
valve
and
adjust
if
necessary
as
described
in a
following
section
SERVO
DIAPHRAGM
To
Remove
1
Detach
the
vacuum
hose
from
the
servo
diaphragm
vacuum
chamber
connection
2
Remove
the
carburettor
from
the
engine
as
previously
described
in
the
Fuel
Section
3
With
the
carburettor
removed
from
the
vehicle
and
placed
on
a
work
bench
withdraw
the
split
pin
and
disconnect
the
servo
diaphragm
link
from
the
carburettor
throttle
lever
4
Loosen
and
remove
the
locknut
and
detach
the
servo
diaphragm
from
the
moun
ting
bracket
on
the
carburettor
NOTE
It
is
not
practical
to
dismantle
and
repair
the
servo
assemblv
If
the
unit
is
malfunctioning
then
renew
the
servo
diaphragm
assembll
To
Instal
1
Position
the
servo
diaphragm
on
the
carburettor
bracket
and
instal
and
tighten
the
locknut
2
Connect
the
servo
diaphragm
Iink
to
the
carburettor
throttle
lever
and
retain
with
a
new
split
pin
3
Instal
the
carburettor
to
the
engine
as
described
in
the
Fuel
Section
4
Attach
the
vacuum
hose
to
the
servo
diaphragm
vacuum
chamber
connection
5
Check
the
servo
diaphragm
for
correct
operation
and
adjust
if
necessary
See
following
text
for
correct
procedure
TO
ADJUST
SERVO
DIAPHRAGM
AND
CONTROL
VALVE
NOTE
Make
all
checks
and
adjustments
after
first
bringing
the
engine
to
operating
temperature
Ensure
that the
choke
valve
is
in
the
fullv
open
position
I
Connect
a
tachometer
to
the
engine
distributor
2
Disconnect
the
servo
vacuum
pipe
at
the
control
valve
3
Disconnect
the
control
valve
vacuum
pipe
at
the
inlet
manifold
4
Now
connect
the
servo
diaphragm
vacuum
pipe
straight
to
the
inlet
manifold
by
passing
the
control
valve
5
Start
the
engine
and
without
working
the
throttle
note
the
engine
rpm
reading
on
the
tachometer
scale
205
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Datsun 1000 Specifications

General IconGeneral
BrandDatsun
Model1000
CategoryAutomobile
LanguageEnglish

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