DATSUN B110 1969 Service Workshop Manual

ruel

Sptem

CO

percentage

with
lever
In

D

posltton
15
050

If

necessary
adjust
by
progressively
turmng

throttle

adjustIng
screw
and
Idle

adJusttng

screw
unttl
correct

adjustments
are
made

Notes
a
Do
not

attempt
to
screw
down

the
Idle

adjusting
screw

completely
to

aVOid

damage
to
the

tip
which
will
tend

to
cause
malfunctions

b
After
idle

adjustment
has
been
made

shift
the
lever
to
UN
or
P

position
for

automatic
transmission

c
Remove
wheel
chocks
before

starting

the
car

Idle
Limiter

Cap

Do
not
remove
this
Idle
hmlter

cap
unless

nccesbary
If
this
Unit
IS
removed
It

IS

I
Throttle

adJu
tmg

suew

2
Idle

adJu
t

Ing
rcw

3
Idle
hmlter

p

4

Stopper

FIg
92
Throttle

adjusting
screw
and
Idle

adjusting

screw

rl1urdor

topper

Fig
93

Setting
Idle
limiter

cap

54
necessary
to

re

adJust
it
at
the
time
of
In

stallatIOn
To

adjust
proceed
as
follows

Make
sure
that
the

percentage
of
CO

contents

sattsfies
the

speClficattons

Install
idle
hmIter

cap
In

poSItIOn
makIng

sure
that
the

adjustIng
screw
can
further
turn

rotatIOn

In
the
CO
RICH
dIrectIOn

Fuel
Level

Adjustment

Turn
down
the
float
chamber
to
allow
the

float

comIng
Into
contact
WIth
the
needle

valve
and

measure
R
shown
In

Figure
91

When
the
H

IS

approximately
190
mm

0748
In

top
float

posltton
IS
correct
The

top

float

pOSitIOn
can
be

adjusted
by
bendIng
float

seat

Upon
completIOn
of
the

adjustment

check
fuel

level
WIth
the
attached
level

gauge

Adjust
bottom
float

posItion
so
that
clearance

h
between
the
float
seat
and
the
needle

valve
stem
IS
0
0512
to
00669
In

when
the

float
IS

fully
raIsed
Bend
the
float

stopper

properly
as

reqUIred

Fast
Idle

Adjustment

Remove
the
bl
metal
cover

Place
the
fast
Idle
arm
on

the
second

step
of

the
fast
idle
cam
Then

adjust
the
fast

Idle
ad

JustIng
screw
In

such
a

way
that
the
clearance

of
the
throttle
valve
shown
at

A
In
the

Illustratton
Will
be
the

speCificatIOns
See

Figure
92

IH

Float

Float

seat
3
noall

topper

4
Needle

alve

Fig
94

AdJusting
float
level

Fuel

Sptem

FIg
95

Adjusting
fast
d
Ie

B
Choke
val

I
V
uvm
b
k
stem

Vacuum
break
stew

Fig
96
Adjusting
vacuum
break

1

ruel

Sptem

Clearance
of
throttle

Engme
revolutIon

valve

A
ill

rpm

Manual

transmiSSIOn
o
0315

to
0
0346
I
750

to
2
050

Automatic

transmISSIOn
00421
to
0

0461
2

650

to
2
950

c

Rubbu
bJ
nd

Fig
97

Adjusting
choke
unloader

Vacuum
Break

Adjustment

Completely
close
the
choke
valve

Hold
the
choke
valve

by
stretching
the
rubber

band
between
choke
shaft
lever
and
the

btatlOnary
part
of
carburetor

Grip
the

vacuum
break
stem
with

phers
and

pull
straIght
fully

Under
thIS

condltton

adjust
the

gap
shown
at

8

In
the
111ustratlOnl
between
the

choke

valve
and
carburetor

body
to
00449

to
0
0496

In
for
manual
transmission
tar
and
0047
to

0

053
1n
for
automattc
transrnlsslOn

car

by

bending
vacuum
break
rod

51
Choke
Unloader

Adjustment

Completely
close
the
choke
valve

Hold
the
choke
valve

by
stretching
a
rubber

ring
between
the
choke

shaft
lever
and
the

stattonary
part
of
the
carburetor

Open
the
throttle
lever
unttllt

fully
opens

Under
thiS
condltton

adjust
the
clearance
C

In
the
IllustratIOn
between
the
choke
valve

and
the
carburetor

body
to
0
079
In

by
ben

ding
unloader

tongue
See

Figure
94

Note
Make
sure
that
the
throttle
valve

fully
opens
when
the
carburetor
is
moun

Fuel

Sptem

ted

on
the
car
If
the
throttle
valve
fails
to

fully
open
the
unIoader
becomes

inoperative
resulting
in

poor
ac

celleration
after
the

engine
is

started
Note
Use
an
accurate

measuring
in

strument
such
as
a
wheatstone

bridge

B1
metal

cover

settmg

BL
metal

Settmg

Mea
urement
of
bl
metal
heater
resistance

Install
the
bl
metal

cover
m

place
on
the
car

buretor
Make
sure
that
the
resIstance
across

the
termmal
and
the
carburetor

body
IS
m
the

range
from

8
6
to
0
0
ohms
Measure
the

resIstance
without
electnc
current

through

the
heater
and
at
about
70
F
Postllon
the
bl
metal

cover
until
the
mdex

mark
1S

altgned
at
the
middle

pomt
of
the
scale

26
mm
I
024

m
dlJ

30
m
1
181
In
dlJ

Connectml
rod

Secondary
COnnCl

lms

lever

Throltle
lever
4

Secondary
throttle

vaJve

5
Pnmary
throttle
valve

6

Throttle
chamber

Fig
98
Settmg
bl
metal
cover

Fig
99
AdJustmg
mterlock

opening
Pnmary
and
secon

dary
throttle
valves

Fig
100

AdJustmg
dash

pot

17

ruel
S
stem

Note
When
somewhat
over
choked
set

bl
metal

cover
after

turning
it
clockwise

slightly

Adjustment
oflnterlock
Opelntng
of

Pnmary
and

Secondary
Throttle
Values

Open
the

pnmary
Side
throttle

valve
48
from

the

fully
closed

positIOn
and
measure

clearance
GIn
between
the
throttle
valve
and

throttle
chamber
mSlde
wall
as
shown
m

Figure
99

GIn

0
228
m

WIthout

dlsturbmg
the
above

settmg
bend

connectmg
rod
as

necessary
so
that

secoridary

throttle
valve
IS
about
to

open
Upon
com

pletIOn
of
the

adjustment
make

sure
that
the

hnk

system
operates
smoothly

Dash

Pot

Adjustment
AutomatIC
Trans

mlsszon
car

only

It
IS

necessary
that
the

Idhng
speed
of

engme

and

mIxture
have
been
well

turned
up
and

engme
IS
suffiC1
n

y
warm

1

Turn
throttle

valve

by
hand
and
read

engme

speed
when
the
da
h

pot
Just
touches
the

stop

per
lever

Adjust
the

pOSitIOn
of
the
dash

pot
by
turnmg

the
nut
until
the

engine

speed
IS
In

the

range

from
1

900
to
2
000

rpm

Make

sure
that
the

engine
speed
IS

smoothly

leduced
from

3
000
to
1
000

rpm
within
a
few

econds

Removal

Remove
the

aIr
cleaner

DIsconnect
the
fuel
line
vacuum
line

automatic
choke
harness
and
antl

dlesehng

solenOId
harness
from
carburetor

Remove
the
throttle
lever

Remove
four
nuts
and
washers

retaining
the

carburetor
to
the
mamfold
If

necessary

LIft
the
carburetor
and
remove
from
the

mamfold

Remove
and
dlscard
the

gasketcused
between

the
carburetor
and
mamfold

8
Disassembly

The
main

Jets
and
needle
valves
on
both

primary
and

secondary
Sides

are
accessible

from
outSIde
of
the
carburetor
for
disassem

bly
Remove
throttle
return

sprmg

Remove

pump
level
shaft
take
out

pump

lever
and

pump
connectmg
rod

Remove
rubber

pipe
from
choke

piston

Loosen
off
bolts

secutlng
servo

diaphragm
In

positIOn
take
out

dIaphragm

Back
off
total
of
five
bolts
which
hold
choke
In

posItion
and

remove
rods
of
starter

system

take
out
choke
chamber

In

removmg
chamber

exercise
care
to
aVOId

damaging
float

The

pnmary
and

secondary
emulsIOn
tubes

can
be
disassembled

by
removmg
the

main
air

bleeds

on
the
indiVidual
SIdes

UII
ij

Fig
101

Removmg
choke
chamber
and
servo

diaphragm

o

llQt

o

Fig
102
Removmg
emulsion
tubes

Fuel

Sptem

In

removIng
Injector

weight
piston
return

sptlng
and
ball

care
should
be
exercIsed
to

prevent
them
from

beIng
scattered
and
lost

To

check
the

accelerator

pump
the

pump

cover
IS

removed
Be
careful
not
to
lose
the

return

spring
and

mlet
valve

bal

prOVided

at

the
lower

part
of
the

piston

dUring

dIsassembly

Removal
of
bl
metal

cover
IS
a

sImple
matter

of

removmg
three
set
screws

When

It

becomes

necessary
to
take
out
float

pull
shaft

from
float

Note

Under
no

C1rcumstances
should

bl
metaI

be
moved
with

excessive
force

Since
this

may
cause

a

permanent
set
In

b1
metal

making
starting
d1fficuIt

The

thlottle
chamber

can
be
detached
from

the

float
hamber

by
removmg
three
set

screws

Fig
103

Disassembling
accelerator

pump
and
bl
metal

cover

1

EC013

Fig
104

RemOVing
throttle
chamber
Do
not

remove
antl

dlesehng
solenOId

unless

It
IS

necessary
to

change

It
IS

preferable
to

leave
throttle
valve
mtact

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

Idlmg
and
slow

speed
per

formance
Will
not

be
obtamed

In

dlsassembhng
and

reassembhng
in

terlockIng
hnks
take

care
so
that
each

lInkage
has

a
smooth
action
and

that
It
IS
not

fitted
m

any
forced

posltton

Cleaning
and

Inspection

Dirt

gum
water

or
carbon

contammatIon
m

or
on
the
exterior

movmg
parts
of
carburetor

are
often

responsible
for

unsattsfactory

perfor

mance

For
thiS

reason

effiCient
carbureton

depends

upon
careful

cleamng
and

InspectIOn
whtle

servlcmg

Blow
all

passages
and

castmgs
wIth

com

pressed
aIr
and
blow
off

all

parts
unttl

dry

Note
Do
not

pass
drills

or
wires

through

calibrated

jets
or

passages
as
this

may

enlarge
orifice
and

seriously
affect
car

buretor

calibration

Check
all

parts
for
wear

Replace
worn

part

EspeCially
the

followmg
matters
should

he

noted

I

1
Q

o

Fig
105

RemOVing
throttle
valve

18

Fuel

SJstem

Check
float
needle
and
seat
for

wear

Replace

the

assembly
If

worn

Check
the
throttle
and
choke
bores
In
throttle

body
and

cover

castIng
for
wear
or
out

of
round

Inspect
Idle

adjustIng
needles
for
burrs

or

ndges
Replace
as

reqUIred

Inspect
gaskets
to

ensure
that

they
do
not

ap

pear
hard

or
bnttle
and
that
the

edges
are
not

turned

or
dIstorted
If

any
such
condItIOn
IS

detected

they
must
be

replaced

Check
filter
secreen
screen
for

cloggIng
Clean

and
If
It
IS
dIstorted
or
remaInS

plugged

replace

Check
cluster
for
loose

or
worn

parts
If

damage
or
Ioosene
s
eXists

replace
cluster

assembly

Check
the

hnkage
for

operatIng
condItion

Inspect
the

operatIOn
of

acceleratIng
pump

Pour

gasohne
Into
the
float
chamber
and

operate
the
throttle
hver
Check
conditIOn
of

gasohne
InjectIOn
from
the

acceleratIng
nozzle

Assembly
and
Installation

Assemble
and
Install
the
carburetor
In

I

everse

sequence
of

dIsassembly
and
removal
Replace
the

gaskets
If

necessary

When

dlsassembhng
and

reassembhng
the
In

terlock
hnk
and
related

components
be

careful
not
to

bend
or
deform
the

components

Reassembly
carefully
and

correctly
so
that
all

Interlock
hnks

operate
smoothly

Jets

The
carburetor

performance
depends
on

Jets

and

aIr
bleed
and
the
vehicle
emISSIOns

largely
depends
on
the
carburetor

performan

ce
That

IS

why
these

components
are

manufactured
WIth
utmost
care

To
clean
them
use

gasohne
and
blow
aIr
on

them

ChangIng
Jet
or
air

bleed
sIze

may

cause
III
vehICle
emIssIon
So

they
should
not

be

changed
theIr
numbers

Trouble

Shootmg

In
the

follOWIng
table
the

symptom
and

causes
of
carburetor
troubles
and
remedIes
for

them

are
hsted
to
faclhtate

qUIck
repaIrs

There

are
vanous
causes
of

engIne
trouble
It

sometImes

happens
that
the

completely
effec

tlve
carburetor
seems

apparently
to
have

some
troubles
when
electnc

systern
IS
defec

tIve
Therefore
whenever
the

engIne
has

troubles
electnc

system
must
be
checked
first

before

adjusting
the
carburetor

TROUBLE
SHOOTING

Troubles
POSSible
causes

Remedlc

Overflow
Dirt

accumulated
on
needle
valve
Clean
needle
valve

Fuel

pump
pressure
100

hIgh
RCpJlf

pump

Needle

valve
seat

Improper

Lap
or

replai
e

ExceSSIve
fuel

Fuel
overflows
See
above

I
l

onsumptlon

Each

mam
aIr
bleed

clogged
Clean

80

ruel

Sptem

Troubles

Power

shortage

Improper
IdlIng

Rough
engIne
Idle

or

eogme
stop

Engme
Idle
too
fast
Possible
causes

Gauge
plate
adjustment
mcorrect

Choke
valve
does
not

open

Outlet
valve
seat

of
accelerator

pump
1m

proper

Lmked

openmg
of

secondary
throttle
valve

too

early

each
mam

Jet
clogged

EaLh
throttle
valve
does
not

fully
open

Fuel

pump
operated
Improperly

uel
stramer

clogged

Vacuum

Jet
clogged

Power
vdlve

operated
Improperly

Slow

Jel
dugged

Fat
h
thronle
valve
does
not
close

Secondary
throttle
valve

operated
Im

properly

Eal
h
throttle
valve
shaft
wear

Packing
between
mamfold
and
carburetor

defective

Fuel
overflows

Incorrect
carburetor

adjustment
Idle

speed

Idle
miXture
choke

settmg

Incorrect
baSIC

1
OIt100

tunmg

Incorrect

automatic
temperature
control
air

cleaner

Defect
or
malfunction

of

Igmtlon
system

spark
plug
lugh
tenSion

cable
breaker

JX
Int

Ignition
COIl
etc

Trouble
In
throttle
lInk
and
cable

Incorred
throttle

opener
adjustment

Trouble
In

PCV
valve

Trouble
In
automatic

choke

Defect
or

malfunctIOn
of

Igmhon
s
stem

spark
plug
hIgh
tenSion
cable
breaker

pomt
Ignition
Call
elc
Remedies

Correct

adjustment

Adjust

Lap
or

replace

Adlust

Clean

Adjust

Repair

Clean

Clean

Adlust

Clean

Adlusl

Overhaul
and
dedn

Replace

ReplaLe
tlghtenlllg

See
the
fust
Item

Adjust
Idle

speed
mixture
dnd

tUllIng

Adjust
19mtlon
timing

Adjust
automatlL

temperature
control
air

cleaner

Adjust
or

replaLe
IgllltIun
system

Chel
k
throttle
hnk
and
Lable

Adjust
throttle

opener

Replace
PCV
vJlve

Adjust
auotmJtIL
l
hoke

Adjust
or

replac
e

IgllltIun
system

J

81

Fuel
I
em

Troubles

Engine
hesitatIOn

Car
knock
when

coastIng

EnglOe
does
not

start

82
POSSIble
causes

Eal
h
mam

Jet
slow

Jet
clogged

By

pdss
hole
die

pdssage
dogged

Emulsion
lube

dogged

Idhng
adlostment
mcorrect

Secondary
throttle
valve

operated
1m

properly

Incorrect
throttle

opener
adjustment

Trouble
m
PCV

valve

Defect
or

malfunction
of

Igmtlon
system

spark
plog
ugh
tenSIon
cable
breaker

pomt
IgmtIon
cod

etc

Fuel
overflows

No
fuel

IdlIng
adjustment
mearrect

Fast
Idle

adjustment
mcareeet

Damaged
antl
dlesehng
solenoId

BI
metal
rod
m

contact
WIth
bl
metal
case
RemedIes

Clean

Cledn

lube

lean

Correct

adjustment

Overhaul
and
clean

AdjUstlhroltle
opener

Replace
PCV
valve

Adjust
or

replace
IgJuhan
system

See
the
first
Item

Check

pump
fuel

pIpe
and
needle
valve

Correct

adjustment

Correct

adjustment

Replace

Adlust

Cooling

Sptem

Fig
106
Coolmg
system

C0026

FIg
107
Water

pump
and
front
cover

FIg
1I1S
Water

pump
removal

DESCRIPTION
radiator
w1th

hIgh
coohng
efficiency
and
of

a

pellet
type
thermostat

The

coohng
system
IS
of

a
closed

pressure
type

With

hIgh
coolmg
capablhty
Coohng
water
WATER
PUMP

flowmg
through
resIstance
free
water

passages
m
the

cyhnder
head
and

cyhnder
The
water

pump
IS
a

centrifugal
type
water

block
IS
mamtamed
at

adequate
temperature

pum
WIth
an

alumlpum
d1e
cast

pump
body

range
at

allo
tlmes

by
means
of

an

ample
T
he

olute
chamber
IS
bUIlt
mto
the
front

capacIty
water

pump
of

a

corrugated
fin

type
cover

assembly
and
a

high
pressure

seahng

84