1973 DATSUN B110 manual transmission

EMISSION
CONTROL
AND

TUNE
UP

Operation
manual
transmission

equipped
model

The

operation
of
the
solenoid
is

by
means
of
the

movement
of

the

speedometer
needle

When
vehicle

speed
falls
below
16

km
h

10

MPH
the

needle
movement

produces
a

signal
which
in
turn
is

amplified
to
actuate
the

solenoid

I
Vehicle

speed
Speed
Throttle

Throttle

switch
opener

opener

solenoid

Below
16
km
h
Not

10
MPH
ON
ON

actuated

Above

16
km
h

OFF
OFF

Actuated

10
MPH

Operation
automatic
transmission

equipped
model

The

solenoid
is

operated
by
an
inhibitor

switch
which

actuates
the
solenoid

only
when
the
transmission
is

placed
in

the
N
or
P

position

c
fil

rn

AT057

Fig
ET
18

Inhibitor
switch
installation

Checking
and

adjusting
throttle

opener

Principally
it
is

unnecessary
to

adjust
the
throttle

opener
however
if
there
is

any
requirement
the

adjust

ment

procedure
is
as

follows

Prepare
the

following
tools

1
A

tachometer
to
measure
the

engine

speed
and
a

screwdriver

2
A
vacuum

gauge
and

connecting
hose

ET
13
Notes
a
A

quick

response
boost

gauge
such

as
Bour

don
s
tube

type
is
recommended
Do
not

use

mercury
manometer

b

Any
special
tools

are
not

required

Warming

up

Warm

up
engine
until
it
is
heated

to

operating

temperature
Make
sure
that

the
automatic
choke
valve

is

fully
open

Connecting
vacuum

gauge

Disconnect
vacuum
hose
between
intake

manifold
and

automatic

temperature
controlled
air

cleaner
install

a

vacuum

gauge
to
intake
manifold
connector
as
shown

in

Figure
ET

19

1
Intake
manifold

2
Connector

3
Vacuum

gauge
4
Vacuum
control
valve

5
Throttle

opener

solenoid

Fig
ET
19

Adjusting
throttle

opener

Deenergizing
solenoid

Disconnect
throttle

opener
and
vacuum

cutting
valve

solenoid
harness

and
free
solenoid

Adjusting
idling

Check
the

engine
idling
Adjust
if

necessary

Engine
idling

rpm
Idling

timing

I
CO

degree

SO

BTDC

I
L51c0
5

SO

BTDC

I
I
S
1c
0
5
M
T
Car

A
TCar
800

6S0
in
D

ENGINE

Gear
Vacuum
advance
Note

R
No

1st
No

2nd
No

3rd
No

4th
Yes
Immediately
after

starting
the

engine
in
cold

weather
vacuum
advance
is
available

for
all

gear

positions

A12

Engine
with
Manual
Transmission

Distributor

Ignition
switch

8

1

J
Battery
Thermo
switch

9

Transmission

L

r
l

r
Vacuum
advance
unit

To
carburetor

Needle

valve

OFF

l
To
air
cleaner

ON

Vacuum

cutting
valve

solenoid

Top
switch

Top
off
I

7
1

OFF
Vacuum
actuated

ON
Vacuum
eminated

into

atmosphere

Fig
ET
28

Schematic

drawing
of
transmission
controlled
vacuum

advance

system

When

electric
current
flows

through
the

vacuum

cutting
valve

solenoid
the
needle
valve

opens
and
intro

duces
air
from
the
air
cleaner
into
the
vacuum
advance

unit

of
the
distributor

through
the

vacuum
hose
and
the

vacuum
advance
is
eliminated
When
the
vacuum

cutting

valve
solenoid
is

deenergized
the

needle
valve

closes
and

the
vacuum
created

by
the
carburetor
is

introduced
into

the

vacuum
advance
unit
of
the
distributor
to

provide

usual
vacuum
advance

The

Top
switch
located

on
the
transmission
case

operates
so
as

to

interrupt
the
flow

of
electric
current

when
the

gear
is

placed
into

Top
but

allows
it

to
flow

in

other

gear
positions

Fig
ET
29

Top
switch
installation

ET
18

ENGINE

Spark
plugs

Cap
mm
in
0
8
to
0
9
0
03110
0
035

Idle
CO
ldie

speed

Manual
transmission

rpm

rpm
1
5

to
5
800

1
5
to
5

650
in
D

position
Automatic
transmission

Dash

pot

Setting

engine
speed

rpm
1
900

to
2
000

Throttle

opener
at
sea
level

Setting
vacuwn

pressure

Manual
transmission

Automatic
transmission

Setting

engine
speed
no
load

Servo

diaphragm
full
stroke
rpm

mm
in
500
to
540
19
7

to
21
3

480
to
520

18
9
to
20
5

1
650
to
1
850

5
0
1969
mmHg
in
Hg

mmHg
in
Hg

Theono
switch
Temperature
rises

from
low
to

high
oC
0

F
above
5

41

Flow

guide
valve

Opera
ting

pressure
mmHg
in

Hg
10
0
4

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Troubles
Possible
causes
Remedies

CANNOT
CRANK

ENGINE
OR
SLOW

CRANKING
Improper
grade
oiL
Replace
with

proper
grade
oiL

Discharged
battery
Charge
battery

Defective

battery
Replace

Loosen
fan
belt
Adjust

Trouble
in

charge
system
Inspect
charge
system

Wiring
connection
trouble
in

starting
circuit
Correct

Defective
starter
switch
Repair
or

replace

Defective
starter
motor
Repair
or

replace

ET
26

I

ENGINE

MECHANICAL

SERVICE
DATA
AND
SPECIFICATIONS

GENERAL
SPECIFICATION

Cylinder
arrangement
4
in
line

Displacement
cc
cu
in

mm
in
1
171
71
5

73

x
70
2
874

x
2
756

Bore
and
stroke

Valve

arrangemen
t
Over
head
valve

Firing
order
I
3
4
2

Engine
idle

rpm
800
Manual
transmission

650in
D

Automatic
transmission

Compression
ratio
8
5

Oil

pressure
Hot

at
2
000

rpm

kgfcm2
Ibfsq
in
3
0

to
3
5
43
to

50

TIGHTENING
TORQUE

Unit

kg
m

ft
lb

Cylinder
head
bolts

Flywheel
bolts
5
5
to
6
0
40

to
43

3
2
to
3

8
23

to
28

6
5

to
7
5
47
to
54

5
0

to
6

0
36
to

43

4
0

to
4
8

29
to
35

0
4
to
0
6
2

9
to
4
3

l
l
to
I
7
8
0

to
12

0

9

to
I
4
6
5

to
10

15

to
16
108
to
116
Connecting
rod
nuts

Main

bearing
cap
bolts

Camshaft

gear
bolts

Oil

pan
bolts

Oil

pump
bolts

Oil
strainer

bolts

Crank

pulley
bolts

EM
33

FUEl
SYSTEM

Secondary
throttle
valve

is

operated
by
throttle
lever

The

high

power
and

good
acceleration
are

gained
with

combination
of

the

auxiliary
valve

2

Accelerating
pump
gives
excellent

acceleration

3

The

power
valve
mechanism
is
of
a

vacuum
actuated

boost

type
and

improves

high
speed
driving

4
The

throttle

opener
control

system
Refer
to
Section

ET

incorporates
a

servo

diaphragm
The
servo
dia

phragm
helps
open
the
throttle

valve
at
a

decreasing
speed

so
as

to
reduce

the
emission
of

hydrocarbons
to
a

minimum

5
An

anti
dieseling
solenoid

is
used
as
a

means
of

preventing
dieseling
When
the

ignition
key
is
turned
off
the
fuel

passage
involved
in
the
slow

system
is

closed

and
the
fuel

supply
is
shut

down

completely

6
In

the
choke

mechanism
an

electric
automatic

choke

is
used
to

automatically
control
the
choke
valve

operation

during
the
warm

up
of
the

engine

7
The
carburetor

for
automatic
transmission
is

equipped
with
so
called

dash

pot
that

is
it
makes
smooth

decelerating
without

engine
stall
at

any

operating
condi

tion

These

carburetors
are

quite
similar
in

appearance
as

explained
above

except
the

dash

pot
for
the
au
tomatic

transmission
model
The

differences
in

performance
are

explained
in
the

following
as

necessary

for
Manual
transmission

for
4utomatic
transmission

Fig
EF
14
External
view

of
carburetor

STRUCTURE
AND
OPERATION

These

carburetors
consist
of

the

primary
system
for

normal

running
and

secondary
system
for
full

load

running
The

float

system
which
is

commonly
used

by
the
primary
and

secondary
systems
the

secondary
switch
over

mechanism

accelerating
mechanism
etc
are

also
at

tached

The
anti

dieseling
solenoid
valve
and
the

power
valve

mechanism

are
used

The

carburetor
is
of
down
draft
two
barrel

type

EF
9

CD

r
Fuel
level

adjustment

@

@

It
I
Float

2

Float
seat
FUEL
SYSTEM

2

Adjust
bottom
float

position
so
that

clearance
h

between

the
float
seat
and
the
needle
valve

stem
is
1

3
to

1
7

mm
0
0512

to
0
0669

in
when
the

float
is

fully

raised
Bend
the

float

stopper

properly
as

required

l

lH

H

ld

up

@

h
Fast
idle

adjustment

Remove
the
bi
metal
cover

3

I
Float

stopper

4
Needle
valve
2
Place
the

fast
idle

arm
on
the
second

step
of

the
fast

idle
earn
Then

adjust
the
fast

idle

adjusting
screw
in
such

a

way
that
the
clearance
of

the
throttle
valve

shown

at

A

in
the
illustration
will
be

the

specifications
See

Figure
EF
26

Fig
EF
25

Adjsuting
float
level

Turn

down
the
float

chamber
to
allow
the
float

coming
into

contact
with
the
needle
valve
and

measure

H
shown
in

Figure
EF
25
When
the
H
is

approxi

mately
19
0
mm

0
748
in

top
float

position
is

correct

The

top
float

position
can
be

adjusted
by
bending
float

seat

Upon
completion
of
the

adjustment
check
fuel
level

with
the

atta
led
level

gauge
Clearance
of
throttle

Engine
revolution

valve
A

mm
in

rpm

Manual
0
80
to

0
88

transmission
0
0315
to
0

0346
1
750

to
2
050

Automatic
1
07
to

l
l
7

transmission
0
0421

to
0

0461
2

650

to
2

950

Fast
idle
earn

steps

5
C

0
J
t

E

r

L

E
I
I

Ogc
l

0

0

JO
A

Throttle
chamber

Fig
EF
26

Adjusting
fast
idle

EF
15

ENGINE

Vacuum
break

adjustment

I

Completely
close
the
chuke
valve

2
Hold
the
choke
valve

by
stretching
the
rubber
band

between
hoke

shaft
lever
and
the
sta

tionary

part
of

carburetor

3

Grip
the

vacuum
break
stem
with

pliers
and

pull

straight
fully

Vacuum
break
rod

Vacuum
break
stew

Rubber
band
4
Under
this

condition

adjust
the

gap
shown

at
B

in
the

illustration
between
the
choke

valve
and

carbure

tor

body
to
1
140
to
1
260
mm

0
0449
to
0
0496
in
for

manual
transmission
car

and
1

205
to
1
335
mm
0
047

to
0
053
in
for
automatic
transmission

car

by
bending

vacuum
break
rod

I

Fig
EF
27

Adjusting
vacuum
break

Choke
un
loader

adjustment

I

Completely
close
the
choke
valve

2
Hold
the
choke
valve

by
stretching
a
rubber

ring

between
the
choke
shaft
lever
and
the

stationary

part
of

the
carburetor

3

Open
the
throttle
lever

until
it

fully
opens

4

Under
this
condition

adjust
the

clearance
C
in
the
illustration
between
the
choke

valve
and
the
carburetor

body
to
2
01

mm
0
079
in

by
bending
unloader

tongue

See

Figure
EF

28

Note
Make
sure
that
the
throttle
valve

fully
opens
when

the
carburetor
is
mounted
on
the
car
If
the

throttle
valve
fails
to

fully

open
the
unloader

becomes

inoperative
resulting
in

poor
acceleration

after
the

engine
is
started

EF
16

FUEL
SYSTEM

5
Check
venturi
clusters

for
loose
or
worn

parts
If

damage
or
looseness
exists

replace
cluster

assembly

6
Check
the

linkage
for

operating
condition

7

Inspect
the

operation
of

accelerating
pump

Pour

gasoline
into
the
float
chamber
and

operate
the

throttle
lever

Check
condition
of

gasoline
injection
from

the

accelerating
nozzle

Assembly
and
instalIetion

Assemble

and
install
the
carburetor
in

reverse

sequence

of

disassembly
and
removal

Replace
the

gaskets
if

necessary

When

disassembling
and

reassembling
the
interlock

link

and

related

components
be
careful
not

to
bend
or

deform

SPECIFICATIONS
AND
SERVICE
DATA

Carburetor
model

Applied
engine

Type

Outlet
diameter
mm
in

rom

in
Venturi
diameter

Main

jet

Main
air
bleed

Slow

jet

Slow
air
bleed

Power

jet

Float
level
H
rom

in

Interlock

opening
of

primary
and

secondary
throttle
valve
G
I

Throttle
valve

opening
480
mm
in

Auto
choke

Fast
idle

setting
clearance
A

mm

in

Manual
transmission

Automatic
transmission

Vacuum
break

gap
between

choke
valve
and

carburetor

body
8

mm
in

Manual
transmission

Automatic
transmission

EF
21
the

components

Reassembly
carefully
and

correctly
so
that

all
interlock

links

operate
smoothly

JETS

The
carburetor

performance
depends
on
jets
and
air

bleeds
and
the
vehicle
emissions

largely
depends
on

the

carburetor

performance
That
is

why
these

components

are
manufactured
with
utmost
care

To
clean
them

use

gasoline
and
blow
air
on
them

Changing
jet
or
air

bleed
size

may
cause
ill

vehicle

emission

So

they
should
not
be

changed
their

numbers

DCH3064
for

Manual
transmission

DCH306
5

for
Automatic
transmission

Downdraft

Primary
Secondary

26
1
024
30
1
181

20
0
787
26
1
024

1
95

1
140

1
80

1
80

1
43

1
50

1
215

1
100

1
60

18
to
20
0

709
to
0
748

5
8
0
2283

0

80
to

0
88
0
0315
to
0

0346

1
07
to
1
17
0
0421
to
0

0461

1
140
to
1
260
0
0449

to
0
0496

1

205
to
1

335
0

0474
to
0
0526