1969 DATSUN B110 Service Repair Manual

Fuel

Sptem

Capacity
Test

The

capaclty
test

IS
used

only
when
the
statIc

plessure
IS

wlthm

specIficatIOns
The

capacity

test

IS
conducted

as
follows

Disconnect
the
fuel

p1pe
at
the
carburetor

Place
a
bUltable

contamer
at
the
end
of
the

pIpe

Start
the

engme
and
run
at
1

000

rpm

The

pump
should
delIver
1
US

pt
of
fuel
In

one
mmute
or
less

If

no

gasolme
or

only
a
lIttle
flows
flOm

open

end
of

pIpe
the
fuel

pIpe
IS

clogged
or
the

pump
I

malfunctlOntng
Before

removing
the

pump
remove
the

gas
tank

cap
dIsconnect

both
Inlet
dnd
outlet

pIpes
and
blow

through

them
wIth
an
aIr
hose
to
make

sure
that

they

are
clear

Thl
wIll
elImmate

pOSSible
clogged
gas

tramer
In

the
fuel
tank
Reconnect
the

pIpes

to
the

pump
and
rete
t
flow

Removal
and

DisassenbIy

Remove
the
fuel

pump

assembly
by
un

screwmg
two

mounting
nuts
and
dIsassemble

In
the

follOWing
order

Separate
the

upper

body
and
the
lower

body

by
unscrewmg
the

body
set
screws

Take
off
the

cap
and
the

cap

gasket
by

I

emOVIng
the

cap
screw

Unscrew
the
elbow
and
the
connector

Take
off
the
valve
retainer

by
unscrewmg
two

valve
retamer
screws
Two
valves
are

eaSIly

removed

To
remove
the

diaphragm
diaphragm
sprmg

lower

body
seal
washer
and
lower

body
seal

from

the
lower

body
press
down
the

dIaphragm
counter
to
the
force
of
the

dIaphragm
spring
and
while

dOIng
thIS
cant

the

dIaphragm
so
that
the

rectangular
part
m

the
lower
end
of
the

pull
rod
IS

unhooked
from

the
rocker
arm
lInk

Inspection

Check
the

upper
and

lower
bodIes
for
cracks

2
Check
the
valve

assembly
for
wear
of
the

valve
and
valve

sprmg
Blow
the
valve
assem

bly
by
breath
to
examme
ItS
functIOn

Check

the

dIaphragm
for
small
holes
cral
ks

and

wear

Check
the
rocker

dl
m

for
wear

at
the

portIOn

In
contact
With
the
camshaft

Check
the
rocker
arm

pin
for
wear

since
a

worn

pm
may
cause
011

leakage

Check
all
other

components
for

any
abnor

mahtIes
and

replace
With

new

parts
as

requIred

Assembly

Assembly
IS
done
In

reverse
order
of
disassem

bly
For

reassembly
and
remstallatlOn
the

followmg
matters
should
be
noted

Use
new

gasket

Lubricate
the
rocker
arm
link
rocker
arm

pm

and
lever

pm
before
mstallatlOlI

To
test

the
functIOn

poSItIOn
the
fuel

pump

assembly
about
33ft
above
fuel
level
WIth
a

pipe
connecting
the
fuel

pump
and
the
fuel

filter
and

operate
the
rocker
arm

by
hand
If

fuel
IS
drawn

up
soon
after

the
rocker
arm
IS

released
the
functIOn

of
the

pump
IS

satIsfactory

CARBURETOR

Description

The
carburetors

are
of
a
downdraft

type

whIch

IS

deSIgned
and
bUIlt
to

Increase

power

and
fuel

economy
as
well

as
to
reduce
the

em1SSlon
of
exhaust

gases

These
carburetors

present
several
dIstinct

features
of

Importance
to
the

car
owners

A

summary
of
features

IS
as
follows

Secondary
throttle
valve

IS

operated
by
throt

tie
lever
The

hIgh

power
and

good
ac

celeratIon

are

gained
With

combmatlOn
of

the

auxlhary
valve

Acceleratmg
pump
glves
excellent
ac

celeratIon

Fuel

Sptem

The

power
valve
mechanIsm

IS
of
a
vacuum

actuated
boost

type
and

Improves
hIgh
speed

drivIng

The
throttle

opener
control

system
Incor

porates
a
servo

diaphragm
The

servo

dIaphragm
helps
open
the
throttle
valve
at
a

decreasIng
speed
so
as
to
reduce
the
emISSIOn

of

hydrocarbons
to
a
minImum

An
antI

dlesehng
olen01d
IS
used
as

a
means

of

preventIng
dlesehng
When
the

IgnItIOn

key
IS
turned
ofT
the
fuel

passage
Involved
In

the
slow

system
IS
closed
and
the
fuel

supply

IS
shut
down

completely

In
the
chok
mechanIsm
an
electric

automatIc
choke
IS
used
to

automatically
con

trol
the
choke
valve

operatIOn
durIng
the

war

m

up
of
the

engIne

The
carburetor
for
automatic
transmiSSIOn
IS

eqUIpped
WIth
so
called
dash

pot
that
IS
It

makes
smooth

deceleratIng
WIthout

engIne

stall
at

any
operatIng
conditIOn

These
carburetors

are

qUIte
SImIlar
In

ap

pearance
as

explaIned
above

except
the
dash

pot
for
the
automatIc
transmISSion
model

Adjustment

Idhng
Adjustment

Idle
mixture

adjustment
requIres
the
use

of
a

CO
meter
When

prepatlng
to

adjust
Idle
mIxture
It
IS
essentIal
to
have
the
meter

thoroughly
warmed
and
cahbrated

Warm

up
the

engIne
suffiCiently

ContInue

engme
operatIOn
for

one
mmute
un

der

ldhng
speed

Adjust
throttle

adjustIng
screw
so
that

engme

speed
IS
800

rpm
m
N

pos1tIon
for

automatic
transmiSSIOn

Check

IgmtlOn
tl
If

necessary

adjust
It
to
the

speCificatIOns

IgnItIOn
tImlo
800
rpm

Adjust
Idle

adJustmg
screw
so
that
CO

percen

tage
IS
1

5
0
50
at
800
ns

a
On
automatIc

transmiSSIOn

eqUipped
model
check
must
be

done
In
the
D

poSItIon
Be
sure
to

apply

parkmg
brake
and
to
lock
both
front
and
rear

wheels
With
wheel
chocks

b
Hold
brake

pedal
while

steppIng
down
on

accelerator

pedal
OtherWise
car
Will
rush
out

dangerously

On

automatIc
transmiSSIOn

eqUIpped
model

make

sure
that
the

adjustment
has
been
made

With
the
selector
lever
In
N

posItIon

And
then
check
the

specificatIOns
With
the

lever
In
D

pOSitIOn
Insure
that
CO

percent

and
Idle

speed
are
as
follows

Idle

rpm
650

for
Manual
transmISSion

for
Automatic
transmISSion

Fig
91
External
view
of
carburetor

3

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