fuel consumption DATSUN 610 1969 Workshop Manual

t
r

Engine
type

Ovendi
cngth
1300
L
13

Overall
width

Oyerall
height

Turning
circle
din

metres
tfeet
Supen
eded
by

Track
font

rear
1400
c
c

car

Ground
dearance
Olin

Weight
dry
I
820
808

I

Fuel
tClflk
capacity
35
29
6

150
93

Fuel
consumption

aximum
peed
Technical
Data
BLUEBIRD

400
1600
1600

U4
U6

0
4
120
162
20

1
560
6142
410
55
51

420
55
91

10
2
33
5

270
50
0

2
420
95
281

215
8
5

885
1
950
210
8
27

930
2
050

10
1
12

33
2
27
7

50
931
28
2123
5

60
99
L
16

4
215
165
941

1
600
62
99

405
55
3
Ii

0
6
34
8

290
50
79

1
300
51
18

2
500
98
43

185
7
281

955
2
1061

12
14
5

28
2
23
5

60
991
BLUEBIRD
1800
L
18

3
0
5
57

320
5
971

000
2
2051

165
103
BLUEBIRD

1800
ESTATE

U8

4
280
168
501

4
5
557

330
52
361

1
065
2
348

FLOAT
LEVEL

Adjustment

A
constant
fuel

level
in
the
float

chamber
is
maintained

by

the
float
and
ball
valve

Fig
D
12
If
the
fuel
level
is
not

in

accordance
with
the
level

gauge
line
it
will
be

necessary
to
care

fully
bend

the
float
seat
until
the
float

upper
position
is

correctly

set

Fig
D
13

The
clearance
H
between
the
valve
stem

and
float
seat

should
be
1
0
mm
0
039
in
with
the
float

fully
lifted
as
shown

Adjustment
can

be
carried
out

by
carefully
bending
the
float

stopper
Fig
D
14
until
the

required
clearance
is
obtained

SU
TWIN
CARBURETTORS

Adjustments

It
is
essential
that
the
two

carburettors
are

correctly
adjusted

if

peak
m3l1ce
and
economical
fuel

consumption
is
to
be

realized
Incorrect
carburettor

a
ljustment
will
have
an
adverse

affect

during
idling
and
on

acceleration
etc

Carburettor

synchronization
and

idling
adjustment

Run
the

engine
until
it
reaches
its
normal

operating

temperature
remove
the
air
cleaner
and
slacken

the
front

and

rear
throttle

adjusting
screws
the
balance
screw
and
the
fast

idling
setting
screw
Make
sure
that
the
front
and
rear
throttle

shafts
are
not
connected

Fully
tighten
the

idling
adjustment

nuts
of

the
front

and
rear

carburettors

Fig
D
15

the
back

off
each
nut

by
an

equal
amount
and

by
one
and
a
half
to
two

tUrns

Screw
in
the
front
and
rear
throttle

adjusting
screws

by
a

few
turns
and
start
the

engine
Allow
the

engine
to
reach
its

normal

operating
temperature
before

proceding
to

the
next

stage

Adjust
the
front
and
rear
throttle

adjusting
screws
until

the

engine
speed
is
reduced
to

approximately
600
700
r

p
m

The

engine
should
turn
over

smoothly
and

consistently
Apply

a

flow
meter
to
the
front
carburettor
air
cleaner

flange
and
turn

the

adjustment
screw
on
the
flow
meter
so
that
the

upper
end

of
the
float
in
the

glass
tube
is
in

line
with
the
scale
Uft
off
the

flow
meter

and
apply
it
to

the
rear
carburettor
air
cleaner

flange

without

altering
the

setting
of
the
flow
meter

adjusting
screw

If

the

position
of
the
flow

meter
float
is
not

aligned
with
the

scale

adjust
the
rear
carburettor

throttle
adjusting
screw
to

align
the
float
with
the
mark
on
the
scale

With
the
carburettor
flow

correctly
adjusted
turn
the

idling
adjustment
nuts

of
both
carburettors

approximately
1
8

of

a
turn

either
way
to
obtain

a
fast

and
stable

engine
speed

Both
nuts
must

be
turned

by
an

equal
amount

Back
off
the
front
and
rear
throttle

adjusting
screws
and

adjust
the

engine
speed
to

the

specified
value
of

650
r

p
m

for

the
standard

engine
or
700
r

p
m
with
vehicles
fitted
with

automatic
transmission
Make
sure

that
the
air
flow
of

both

carburettors
remains

unchanged
Screw
in
the
balance
screw

until
the
screw
head
contacts
the

throttle
shafts
without

changing
the

idling

speed
setting

Move
the
throttle

connecting
shaft
and
accelerate
the

engine
a
few
times
then
check
that
the

idling
speed
is

unchanged

Turn
the
fast
idle

setting
screw

to
increase
the

engine
speed

to

approximately
1500

r

p
m
and
recheck
with
the
flow
meter
that
the
air
flow
for
both
carburettors
is

correctly
matched
If

the
air
flow
is
uneven

it
will
be

necessary
to

readjust
the
balance

screw

Finally
back
off

the
fast
idle

setting
screw

Fig
D
16

and
decrease
the

engine
speed
Apply
the
flow
meter
to

the

carburettors
to
confirm
that
the
float

positions
are
even
Re

adjust
if

necessary
by
means
of

the
throttle

adjusting
screws

Stop
the

engine
and
fit
the
air
cleaner

SU
TWIN
CARBURETTOR

Dismantling

Piston
and
suction
chamber

Dismantling

Unscrew
the
plug
and
withdraw
the

piston
damper
Fig
D

17
Remove
the
four
set
screws

and
lift
out

the
suction

chamber
withdraw
the

spring
nylon
washer
and
the

piston

Take
care
not
the

damage
the

jet
needle
and
the
interior
of

the

suction
chamber

Do
not
remove
the

jet
needle
from
the

piston
unless

absolutely
necessary
If
a

replacement
is
to
be
fitted
ensure
that

the
shoulder
of
the
needle
is
flush
with
the
lower
face
of

the

piston
This

operation
can

be
accomplished
by
holding
a
strai

edge
over
the
shoulder
of
the
needle
and
then

tightening
the

set
screw
as
shown
in
Fig
D
18

Wash
the
suction
chamber
and

piston
with
dean
solvent

and

dry
with

compressed
air
Lubricate
the
piston
rod
with
a

light
oil
Do

NOT
lubricate
the

large
end
of
the

piston
or
the

interior
of
the
suction
chamber

NOZZLE

Dismantling

The
nozzle
See
Fig
D
19
can
be
removed

quite
easily

but
should
not
be
dismantled
unless

absolutely
necessary
as

reassembly
of

the
nozzle
sleeve
washer
and
nozzle
sleeve

set
screw
is
an

extremely
intricate

operation

To
remove
the
nozzle
detach
the

connecting
plate
from

the
nozzle
head

pulling
lightly
on

the
starter
lever
to
ease
the

operation
Loosen
the

retaining
clip
take
off
the
fuel
line
and

remove
the
nozzle
Be
careful
not
to

damage
either
the
jet

needle
oc

the
nozzle
Remove
the
idle

adjusting
nut
and

spring

The
nozzle
sleeve
can
be
removed
if

necessary
by
taking
out

the
set
screw
but
as
previously
stated
should
not
be
dismantled

unless

absolutely
necessary

SU
TWIN
CARBUREfTOR

Assembly

Assemble
the

piston
assembly
into

position
but
do
not

fill
with

damper
oil

Assemble
the
nozzle
sleeve
washec
and
set
screw

by

temporarily
tightening
the
set
screw

Set
the
piston
to
its

fully

closed

position
and
insert
the
nozzle
until
it
contacts

the
nozzle

sleeve
When

the
nozzle

jet
contacts
the

jet
needle
the
nozzle

sleeve
must
be

slightly
adjusted
so

that
it
is
at

right
angles
to
the

centre
axis

and
positioned
to
leave
the
nozzle

jet
clear
of

the

jet
needle
Raise
the

piston
without

disturbing
the
setting
and

allow
it
to

drop
The

piston
should

drop
smoothly
until
the

stop
pin
strikes
the
venturi
with
a

liaht
metallic
click
See
below

under

Centering
the

jet
Tighten
the
nozzle
sleeve
set
screw

remove
the

nozzle
install
the
idle

adjustinJ
spring
and

adjusting

nut
on
the
nozzle
sleeve
and
refit
the
nozzle

39

N
Engme
SYMPTOMS
I

Trouble
Shooting
Lubrication
System

SYMPTOMS

bed
t
f
I
h
i
1m
0
p
q
r
I
I
II
bed
t
f
I
h
Ii
I
m
n

ENGINE
WILL
NOT
CRANK

ENGINE
CRANKS
SLOWLY

ENGINE
CRANkS
BUT
OOES
NOT
START

ENGINE
STARTS
BUT
RUNS
FOR
SHORT

PERIODS
aNL
Y

ENGINE
I
tISFIRES
AT
LOW
SPEED

ENGINE
MISFIRES
AT
HIGH
SPEED

ENGINE
MISFIRES
AT
ALL
SPEEDS

ENGINE
MISFIRES
ON
ACCELERATION

AND
FAILS
TO
REV

ROUGH
IDLE

RUNS
ROUGH
AT
HIGH
SPEED

lACK
OF
POWER

POOR
CCElERA
nON

LACK
OF
TOP
SPEED

EXCESSIVE
FUEL
CONSUMmON

EXCESSIVE
OIL
CONSUMmON

PINKING

COMPRESSION
LEAK
PROIABLE
CAUSE

Faull
In
th
e
ltartinll
IYltem
Refer
to
the
ELECTRICAL

EQUIPMENT
leetion
fOI
dilllflOlIll

b
Eft
ineoiltoothick
Stiffenpne

d
Mechanieal
scimre

Flult
In
lhe
IpUlion
I
ltem
Refer
to
the
IGNITION

SYSTEM
IeCtion
for
di
I

f
Flult
the
fuellYlltm
Refer
to
the
FUEL
SYSTEM

Clion
or
di
l
OIII

Incomcl
tllvetlmln

h
ComprellllllIU
IClk

Air
leak
IRlel
JIlIIni
old

j
Reltriction
nhlu5t5ylltm

Ie
Poor
alYe
WIIIIIJ

I
Stick
tnlvall
n

m
Lclklnl
cylinder
held
Illke

Womcamlhlft
lobel

IncolTe
ttappetclurance

p
Worn
dlm
ed
cylinder
born
pUlon5
Ind
or
pll
f1np

q
Wom
nl
fC
paides

Damaced
a1wlttmseal

LeWnloilwaI
pu
e

Incorrectly
installed
apark
plu

CrICked
cylinder

Broken
weakv
w
sprinp
EXCES9lVE
OIL
CONSUMPTION

WW
OIL
ilRESSURE
PROIABLE
CAUSE
REMEDIES

I
Worn
dlmalJl
dcyhnderbon
P
v
lnd
orpulu
nnr
s

b
WorJl
valve
r
uides

C
D
m
led
valve
lIemluls

d
Lnlunr
oil
ul
pillet

e
Flulty
nil
P
uu
IluP
Iwnch
wmn

f
Relief
valve
defecuve

011
pick
up
pipellfline
blocked

h
011
filler
nver
flow
yaJYe
dcffe

WO
n
oil
pump

J
Dlmllfd
om
maUl
Ind
or
bl
nd
b
lnnll

l
lncorreCllndeofentpneoil

l
Oil
level
10

m
Oillevel
tnnhllh

Oillelk
the
preuunled
Ilde
of
the
lubn
IYSfem
p
Tldc

Rel1
f1nd
yllOde1

ne
OVCntZl
nd
nnJ

b
Rcpltte
v
lve
and
Iltd

c
Repl
cc
5c
l

d
Sullu
rt
pl
cp
aI
kCl

e
Trice
Ind
rtClify

f
heel
lod
replace
if
nccess
T

RemoYcblQChJC

h
Chcck
Ind
repllcclfncct
i
ry

i
Repll
e
rump

J
Renew
nnp

k
Rerl
ec
OIl
with

l
Top
up
oil

m
DTllnofllurpIUloil

Tn
ndremedy

Coolmg
System

b
r
h
j
I
m
p
q

d
REMEDIES
SYMI
IOMS

b
Drlm
oiJ
nd
rcpl
ce
with
ot

Add
smlll
quanllty
n
oil
to
the
fuel
Ind

rune
lmeFnd

d
SlfIpenJine
Ind
renew
p
ru
asn
celllry
I
bed
t
f
I
h
I
i
k
I
mn
0

OVERHEATING
ENGINE
FAILS
TO
REAOI

NORMAL
OPERATING
TEMPERAt
lRE

PROIAILE
CAUSE
REMEDIES

I
RetUne
enJine

h
Trace
ndseal

Tr
Ind
seal

j
RemO
f
t
rellnction

k
Relnnd
sel

I
Freelnd
trice
C
UIe

m
Renewguke
Fit
new
clmlhlrt

AdJult
t
appeti

p
bch
ngeenfin

q
Replacevalnluldes
Rtplace
seall

Repllccgukel
Repllcc
plulwlth
correct
Cl
Ie

Renew
cyhndcrblock

Repllce
5prLnp
I
IlIIIIfficien
coolant

b
DriYebellllippinIOfbrobn

c
RldiatOf
fUll
cloq
ed

d
Coo
inlflndefeclln

e
Wit
pl1mpdtfectlve

f
ThelTllOllatj
mmed
Ihul

Thermost
j
mmed
open

r
t
eti
I
kt
r
re
a
q
brake

j
lntel1laJp
se
lheenpne
ndforradi
torbloeked

11
HOItI
blocked

I
Carburetterm
djullmem

m
Excellive
arbon
depolit
in
thecylinden

In
ffici
enpneoil
uae
of
inferior
p1Ide
of
oil

Exce
inrldi
lorlrea
I
Topupradil
v

b
Ti
htenbdtorftnc

I
t
rmify

e
Repl
cwaterpump

f
Rcpll
e
thermoltll

I
Replleclhermolt
t

h
RetimeiaTUlion

i
Unload
ear
check
brl
ktt

j
Trace
ndclu

k
TfI
cdUrblockaae

L
AdjUllcorrc
cth

m
Decarbonise
fO
tne
top
overh
uJ

Top
up
wlth
correct
rade
Dr
inifneceUlry

PUIl
lly
blink
off
in
winter
only