DATSUN B110 1973 Service Repair Manual

ENGINE

Y
Q

0

Fig
EF
34

Disassembling
accelerator

pump
and

hi
metal
cover

1

EC013

Fig
EF
35

Removing
throttle
chamber

9

The
throttle
chamber
can
be
detached
from
the
float

chamber

by
removing
three
set
screws

Do
not
remove
anti

dieseling
solenoid
unless
it
is

necessary
to

change
If

necessary
refer
to
the
item
of

Anti

dieseling
solenoid

page
EF

12

10
It
is

preferable
to
leave

throttle
valve

intact
unless

otherwise

required
If

throttle
valve

must
be
disassembled

to
remedy
a
defect

secondary
throttle
valve

must
be

installed
with

gap
to
be
free

Otherwise

stable

idling
and
slow

speed
performance

will
not
be

obtained
I

o

rJ

01

o

o

Fig
EF
36

Removing
throttle
valve

II
In

disassembling
and

reassembling

interlocking

links
take

care
so
that
each

linkage
has
a
smooth
action

and
that

it
is
not
fitted
in

any
forced

position

Cleaning
and

inspection

Dirt

gum
water
or
carbon
contamination
in
or
on
the

exterior

moving
parts
of
carburetor
are
often

responsible

for

unsatisfactory
performance

For
this
reason
efficient
carburetion

depends
upon

careful

cleaning
and

inspection
while

servicing

1
Blow

aU

passages
and

castings
with

compressed
air

and

blow
off
all

parts
until

dry

Note
Do
not

pass
drills
or
wires

through
calibrated

jets

or

pssages
as

this

may
enlarge
orifice
and

seriously

affect
carburetor
calibration

2
Check
all

parts
for
wear

Replace
worn

part
Especial

ly
the

following
matters
should
be
noted

I
Check
float
needle
and
seat
for
wear

Replace
the

assembly
if
worn

2

Check
the
throttle
and

choke
bores
in

throttle

body

and

cover

casting
for
wear
or

out
of
round

3

Inspect
idle

adjusting
needles
fur
burrs
or

ridges

Replace
as

required

3

Inspect
gaskets
to
ensure
that

they
do
not

appear

hard
or

brittle
and
that
the

edges
are
not
turned
or

distorted
If

any
such
condition
is

detected

they
must
be

replaced

4

Check
fIlter
screen
for

clogging
Clean
and
if
it
is

distorted
or
remains

plugged
replace

EF
20

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

ENGINE

Choke

unloader
clearance

carburetor

body
C

between
choke
valve
and

mm
in

Bi
metal
resistance

ohms
2
01

0
07911

8

6t09
0

Accelerator

pump

Injector
hole

Return

spring

Fuel

pressure
mm
in

g
mm

Ib
in

kg
cm
2

psi

kg
lb
0
5

0
0197

78
I
I

0
18
2
6

Manual
transmission

Automatic
transmission
Weight
2
8
6
2

2
9
6
39

Example
1
215

represents
215
100
2
15

mm
0
0846
in

diameter

TROUBLE
DIAGNOSES

AND
CORRECTIONS
There
are
various
causes
of

engine
tarubles
It

some

times

happens
that
the

completely
effective

carburetor

seems

apparently
to
have

some
troubles

when
electric

system
is

defective
Therefore
whenever
the

enigne
has

troubles
electric

system
must
be

checked
first
before

adjusting
the

carburetor
In
the

following
table
the

symptoms
and

causes
of

carburetor
tarubles
and
remedies

for
them

are
listed

to

facilitate

quick

repairs

Troubles

Possible
causes
Remedies

Overflow
Dirt

accumulated
on

needle
valve
Clean
needle
valve

Fuel

pump
pressure
too

high
Repair

pump

Needle
valve
seat

improper
Lap
or

replace

Excessive

fuel

consumption
Fuel
overflows
See
above

Each
main
air

bleed

clogged
Clean

Gauge
plate

adjustment
incorrect

Correct

adjustment

Choke
valve
does

not

open

Adjust

Outlet
valve
seat

of
accelerator

pump
im

proper
Lap
or

replace

Linked

opening
of

secondary
throttle
valve

too

early
Adjust

Power

shortage
Each
main

jet
clogged
Clean

Each
throttle
valve

does
not

fully
open
Adjust

Fuel

pump
operated
improperly
Repair

EF
22

Troubles

Improper
idling

Rough
engine
idle
or

engine

stop

Engine
idle
too
fast

Engine
hesitation
FUEl
SYSTEM

Possible
causes

ruel
strainer

clogged

Vacuum

jet
clogged

Power
valve

operated

improperly

Slow

jet
clogged

Each
throttle
valve
does

not
close

Secondary
throttle

valve

operated
im

properly

Each
throttle
valve
shaft
wear

Packing
between
manifold
and
carburetor

defective

Fuel
overflows

Incorrect
carburetor

adjustment
idle

speed

idle
mixture
choke

setting

Incorrect
basic

ignition
timing

Incorrect
automatic

temperature
control
air

cleaner

Defect
or
malfunction

of

ignition
system

spark

plug
high
tension
cable
breaker

point
ignition
coil
etc

Trouble
in
throttle
link

and
cable

Incorrect
throttle

opener
adjustment

Trouble
in
PCV
valve

Trouble
in
automatic
choke

Defect
or
malfunction
of

ignition
system

spark
plug
high
tension
cable
breaker

point
ignition
coil
etc

Each
main

jet
slow

jet
clogged

By
pass
hole
idle

passage
clogged

Emulsion
tube

clogged

EF
23
Remedies

Clean

Clean

Adjust

Clean

Adjust

Overhaul
and

clean

Replace

Replace
tightening

See
the
first
item

Adjust
idle

speed
mixture
and

timing

Adjust
ignition
timing

Adjust
automatic

temperature
control
air

cleaner

Adjust
or

replace
ignition
system

Check
throttle
link

and
cable

Adjust
throttle

opener

Replace
PCV
valve

Adjust
auotmatic

choke

Adjust
or

replace
ignition
system

Clean

Clean
tube

Clean

Troubles

Car
knock
when

coasting

Engine
does
not

start
ENGINE

Possible

causes

Idling
adjustment
incorrect

Secondary
throttle

valve

operated
im

properly

Incorrect

throttle

opener
adjustment

Trouble
in
PCV
valve

Defect

or
malfunction
of

ignition
system

spark

plug
high
tension
cable

breaker

point
ignition
coil
etc

Fuel
overflows

No
fu
el

Idling
adjustment
incorrect

Fast
idle

adjustment
incorrect

Damaged
anti
dieseling
solenoid

Bi
metal
rod
in

contact
with
hi
metal

case

EF
24
Remedies

Correct

adjustment

Overhaul
and

clean

Adjust
throttle

opener

Replace
PCV
valve

Adjust
or

replace

ignition
system

See
the
first
item

Check

pump
fuel

pipe
and

needle
valve

Correct

adjustment

Correct

adjustment

Replace

Adjust

FUEl
SYSTEM

EVAPORATIVE
EMISSION

CONTROL
SYSTEM

CONTENTS

OESCRI
PTION

Flow

guide
valve

MAINTENANCE

AND

TESTING

Checking
fuel
tank

vapor

liquid
separator

and

vapor
vent
I
ins
EF
25

EF

26

EF

26

EF

26

DESCRIPTION

This

system
consists
of

four
basic
elements

indicated

below

I

Fuel
tank

with

positive
sealing
filler

cap
with
relief

valve

2

Vapor

liquid
separator

3

Vapor
vent
line

4
Flow

guide
valve

The
flow

guide
valve

prevents
blow

by

gas
from

flowing
into
the
fuel
tank

and

guides
fresh
air
into
it

preventing
gasoline

vapor
from

escaping
into
the

carbure

tor
air
cleaner

Fl

me
ester

I

f
Flow

Thev
lve

opens
when

thlp
1l

rO

Inch

Hg

O
Positive
unk

venlI1atlon

PCV
hoe
Checking
fuel

tank
vacuum
relief
valve

operation

Checking
flow

guide
valve
EF
27

EF
27

Flow

guide
valve

operates
and
blow

by

gas
and

gasoline

vapor
flow
as
follows

When
the

engine
is
not

running
the

vapor
vent

line

vapor
liquid
separator
and

fuel
tank

are
filled
with

gasoline
vapor
produced
in
the

sealed

type
fuel
tank

A

flow

guide
valve

opens
when
the

gas

pressure
is

above

IOromHg
0
4

in

Hg
The

gas

passed
through
the
flow

guide
valve
2
is

accumulated
in

the
crankcase

Once
the

engine
starts

evaporates
in

the
crankcase

manifold
and

carburetor
air
cleaner

is
sucked
into
the
manifold
for

combustion
When
the

pressure
of
the

sealed

type
fuel

tank

vapor
liquid

separator
and

vapor
vent
line

becomes

negative
by

decreasing
the
fuel
the

flow

guide
valve
I

opens
to
send
fresh
air
from
the
carburetor
air
cleaner

to

the

fuel
tank

lill
K
riquidllepilrflOr

T

VilPOl
vent

line
Positiveteilling

lillercap

Fig
EF
37

Evaporative
emission

control

system

EF
25

ENGINE

ffi68
mmAq
14
5

mAq

3

way
connector

Cock

II
M

nam
e
Flow

guide
valve

This
valve
is
mounted
in

the

engine
compartment

f
tHks
A
F
and
C
are

engraved
in
the

body
of
the

valve
to

indicate
the
connection
of
the

vapor
vent
line

l
l
1

from
Fuel
tank

to
Crankcase

Fig
EF
3B
Flow

guide
valve

MAINTENANCE
AND

TESTING

Checking
of
fuel
tank

vapor
liquid

separator
and

vapor
vent
line

Check
all
hoses
and
fuel
tank
filler

cap

2
Disconnect
the

vapor
vent
line

connecting
flow

guide

valve
to

vapor
liquid
separator

Flow
guide
valve
3
Connect
a
J

way
connector
a
manometer
and
a
l
ul
k

or
an

equivalent
3

wav

change
cock

to
the
end
of
the

vent
line

4

Supply
fresh
air
into
the

vapor
vent
line

through
the

cock
little

by
little

until
the

pressure
becomes
368

romAq

14
5
in

Aq

5

Shut
the
cock

completely
and
leave

it
that

way

6

After
2
5
minutes
measure
the

height
uf
the

liquid
in

the
manometer

7
Variation
of

height
should
remain
within
25

mmAq

1
0
in

Aq

8
When
the

filler

cap
does
not
close

completely
the

height
should

drop
to
zero
in
a
short
time

9
I
f
the

height
docs
not

drop
to
zero

in
a
short
time

when
the
filler

cap
is
removed

it
is
because

of
the

stuffy

hose

Note
In
case
the
vent
line
is

stuffy
the

breathing
in
fuel

tank
is
not
thoroughly
made
thus

causing
insuf

ficient
delivery
of
fuel
to

engine
or

vapor
lock
It

must
therefore
be

repaired
or

replaced

1
m

eparator

1
Fuel
filler
cap

Y

XI

EC029

Fig
EF
39

Checking
evaporative
emission
control

system

EF
26

FUEL
SYSTEM

Checking
fuel
tank
vacuum
relief

valve

operation

Remove
fuel

filler

cap
and
see
if
it
functions

properly

as
follows

Wipe
clean
valve

housing
and
have
it
in

your
mouth

2

Inhale
air
A

slight
resistance

accompanied
by
valve

indicates
that

valve
is
in

good
mechanical
condition

Note

also
that

by
further

inhaling
air

the
resistance
should
be

disappeared
with

valve
clicks

3
If
valve

seems
to
be

clogged
or
if

no
resistance
is

felt

replace

cap
as
an
assembled
unit

1
1

1I

L

CD

hl

cv
CID

t

I
Valve

2
Valve

housing

I
I
Spring

Valve
seat

Fig
EF
40
Fuel

filleT
cap

EF
27
Checking
of
flow

guide
valve

1
Disconnect

all
hoses

connected
to
the

flow

guide

valve

2

While
lower

pressure
air
is

pressed
into

the
flow

guide

valve
from
the
ends

of
vent

line
of

fuel
tank
side

the
air

should

go
through
the
valve
and

flow
to

crankcase
side
If

the

air
does
not

flow
the
valve
should

be

replaced
But

when
the

air
is
blown

from
crankcase
side
it

should
never

flow
to
the

other

two
vent

lines

3
While
the

air
is

pressed
into

the
flow

guide
valve
from

carburetor
air
cleaner

side
it

flows
to
the

fuel
tank
side

and
or

crankcase
side

4
This

valve

opens
when
the

inner

pressure
becomes
10

romHg
0
4
in

Hg
In
case
of

improper
operations
or

breakage
replace
it

iFrom

r
carburetor

air
cleaner

From
fuel
tank

To

r
crankcase

j

iJ
i

ill

1
1

EC030

Fig
EF
4
J

Flow

guide
valve

DATE
ENGINE

SERVICE
JOURNAL
OR
BULLETIN
REFERENCE

JOURNAL
or

BULLETIN
No
PAGE
No

SUBJECT

EF
28

DATSUN

1200

MODEL
B
11

0
SERIES

L
NISSAN

I

NISSAN
MOTOR
CO

LTD

TOKYO
JAPAN
SECTION

EE

ENGINE

ELECTRICAL

SYSTEM

BATTERY

STARTING
MOTOR

CHARGING

CIRCUIT

ALTERNATOR

REGULATOR

IGNITIO
N

CIRCUIT

DISTRIBUTOR

IGNITION
COIL

SPARK
PLUG
EEl

EE
3

EE

15

EE

16

EE

23

EE

29

EE
29

EE

36

EE

37