check engine DATSUN B110 1969 Service User Guide

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

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

Transmission

Worn

gears
shaft
and
or

heanng
Repl
ll
c

In
ufficlcnt

operatmg
stroke
due
to
worn
or
loose

shdmg

pdll
Repair
or

replal
c

Defective
or

damaged

synchronIzer
Replace

Gear

slips
out

of
mesh

In
the
most
cases
thiS
trouble
occurs
when
the
Interlock

plunger
check
ball
and
or

spnng
IS
worn
or
weakened
or

when
the
control

system
IS
defectIve
In
thiS
Cd
the
trouble
cannot
be

corrected

by
repldtlllg
gt
drs

and
therefore

trouble
shootmg
must
be

earned
out

carefully
It
should
also
be
noted
that

gear
slips
out
of
mesh
due
to
vlbralIon

generated
by
weakened
front
and
rear

engme
mounts

Worn
mterlock

plunger
Replal
c

Worn
check
hall
and
or

weakened
or
broken

sprmg
Replal
c

Worn
fork
rod
ball

groove
RepI

H
e

Worn
or

damaged
beanng
Repldce

Worn
or

damaged
gear
Repldl
c

NOise

When
nOIse

occurs
unoer
engine
Idling
and

stops
whde
the
clutch
IS

dlseng
lged
or
when
nOI
Olcurs
while

shlftmg

gears
It

may

Judged
that
the
nOIse

IS
from
the
tranSmll
lSIUn

Ino

ufllclenl
or

1mproper
lubncant
Add
od
or

replace
With

deSignated

oIl

Ollleaklllg
due
to
defectIve
011
seal
md

gasket
clogged
breather
etc
Clean
or

replace

Worn
beanng

High
hummmg
occurs
at
a

high
speed
Replace

Damaged
beanng
Cychc
knockmg
sound
occurs
alllo
at
a
low

speed
Replace

Worn
each

sphne
Replace

Worn
each

hushmg
Replace

108

II
II
II
II
Oil
pressure
and
ignition
warning
lamps

condition

Oil
pressure
warn

ing
lamp

The
amp
does
not

hght
when
the

19I1ItlOn
sWItch
IS

set
to
ON

II
I
Ptobable
cause

Blown
off
fuse
or
faulty
contact

Broken
lamp
bulb
filament
or

faulty
cable
contact

Defective
oil
pressure
swltch

The
lamp
does
not
Oil
pressure
IS
toO
loW

go
out
wlule
the

engtne
IS
being

operated
Lack
of
engine
oil

Defective
Oil
pressure
sWitch

Il
MethOd
of

tnSpeCtlOn

Check
the
fuse
for
fusing
and

faulty
contact

The
warntng
lamP
does
not
bght

when
oil
pressure
sWitch
yelloW
I

black
cable
15
grounded

The
warntng
lamp
bghts
through

the
above
tnspectlOn

inspect
the
engine
ou
pressure

system
Check
011
level

ConttnUlty
eXists
on
the
oil
pres

sure
sWltch
when
the
engine
IS

belng
operated

o

a
t
a

CorrectIVe
action

Replace
after
COffee

tlng
the
fuse
the

cause
lf
fused

Check
the
hght
bulb

for
burnt
out
fila

ment
and
replace
as

reqUIred
Replace
the
011
pres

Sure
sWitch

Add
oil

Replace
the
01
pres

sure
sWitch