1969 DATSUN 610 Workshop Manual

4

Cylinder
head

gasket

Cylinder
block
side
6
Oil

pump

5
Intake
manifold
Block

installing
surface

near
to

oil
exit

Control
valve

Angle
tube
connector
7
Rocker
cover

Tapping
screw
of
bume

plate
installing

SPECIFICATION

a
Valve

mechanism

Valve
clearance
cold
In
0
25
mm
0
0098
in

Ex
0
25
mm
0
0098
in

Hot
Reference
value
0
0098
in

In
0
28
mm
0
011
in

Ex
0
28
mm
0
011
in

Valve
head
diameter
In
42mm
1
654
in

Ex
35mm
1
378
in

Valve
stem
diameter
In
Ex
8mm
0
3150

in

Valve

length
In
116
4
mm
4
58
in

Ex
117
2
mm
4

61
in

Valve
lift
9
0mm
0
354
in

Valve

spring
free

length
Outer
42
5
mm
1
673
in

Inner
414mm
1
630

in

Valve

spring
loaded

length
Outer
29
0
mm
I
142
in

Inner
26
0
mm
1
024

in

Valve

spring
assembling
height
Outer
37
0mm
I
457

in

Inner
34
0
mm
1
339
in

Valve

spring
effective
wind
number
Outer
4
5mm
0
1772
in

Inner
6
25
mm
0
2461
in

Valve

spring
wire
diameter
Outer
4
2mm
0
1654
in

Inner
29mm
0
1142
in

Valve

spring
coil
diameter
Outer
27
5
mm
1
083
in

Inner
19
9mm
0
733

in

Valve

guide
length
In
48mm
1
890
in

Ex
60mm
2
362
in

Valve

guide
height
from
cylinder
head
In
Ex
16
7mm
0
657
in

Valve

guide
inner
diameter
In
Ex
7mm
0
2756
in

Valve

guide
outer

diameter
In
Ex
14
2mm
0
559
in

Valve

guide
to
stem
clearance
In
0
025
0
055

mm

0
0010
0
0022
in

Ex
0
04
0
077
mm

0
0016
0
0030
in

Valve

guide
interference
fit
In
Ex
0
040
0
069
mm

0
0016
0
0027
in

Max
tolerance
of
above
clearance
In
Ex
0

1
mm
0
0049
in

Valve
seat
width
In
Ex
2
05
2
33mm

0
0807
0
0917
in

Valve
seat

angle
In
Ex
900

b
Camshaft
and

timing
chain

Camshaft
end

play
0
07
0
148
mm

0
0028
0
0058
in

Cam

height
36
53
mm
1
438
in

Camshaft

journal
diameter
37
45
37
475
mm

1
474

1
475
in

S14

Camshaft

bend
0

1
mm
0
0004
in

Camshaft

bearing
inner
diameter
375
37
525
mm

I476
I
477

in

0
025
0
075
mm

0
0008
0
0030

in
Camshaft

journal
to

bearing
clearance

c

Connecting
rod

Centre

distance
140mm
5
51
in

Big
end

play
0
110
0
246
mm

0
0043
0
0097
in

Connecting
rod

bearing
clearance

Connecting
rod
bend
0
05
mm
0
0020
in

0
03
0
06
mm

0
0012
0
0024
in

Connecting
rod

bearing
under
size

100
U
S
Bearing
thickness
Crank

pin
diameter

1483
1
499
mm
49
975
59
991
mm

0
0584
0
0590
in
1
967

1
968
in

1
609
1
622
mm
49

725
49741
mm

0
0633
0
0639
in

I
9576
1
9582
in

1734
1
747
mm
49
475
49491
mm

0
0683
0
688
in
1
9477
1
9483

in

1
857
1
872
mm
49
225
49
241
mm

0
0731
0
0737
in

1
938
1
939
in

1
984
I
997
mm
48
975
48
991
mm

0
081
0
0786
in

I
928
1
929

in
Bearing
size

S
T

D

25
U
S

50
U
S

75
U
S

d
Crankshaft
and
main

bearing

Wear
limit
of
ditto
clearance

Crank

pin
taper
and
out
of
round

Main

bearing
clearance
Less
than
0
01
mm

0
060
0
192
mm

0
0024
0
0008
in

0
3mm

Less
than
0
01
mm

0
03
0
06
mm

0
0012
0
0024

in

1
0mm
0
0004
in

Journal

taper
and
out
of
round

Crankshaft
free
end

play

0
0118
in

0
0004
in

Wear
limit
of
ditto
clearance
0
0039
in

Main

bearing
under
size

Bearing
size

Bearing
thickness
Crank

journal
diameter

100
U
S
2
485
2
505
mm

0
0978
0
0986
in

2
612
2
625
mm

0
1028
0

1033
in

2
737
2
750
mm

0
1078
0
1083
in

2
862
2
875
mm

0
1127
0
1132
in

2
987
3
000
mm

0
1176
0
1181
in
55
971
55
990
mm

2
2036
2
2043
in

55
721
55
740
mm

2
194
2
195
in
S
T
D

25
U
S

50
U
S
55
471
55
490
mm

2
184
2
185
in

55
221
55
240
mm

2
174
2
175
in

54
971
54
990
mm

2
164
2
165
in
75
U
S

SI5

Crank
shaf
bend
Less
than
0
02
mm

0
0008
in

e
Piston

Pis
on
diameter

Ellipse
difference

Ring
groove
wid

h
84
968
85
0
mm

3
345
3
346
in

0
4
mm
0
01
7

in

Top
0
05
0
0020

0
0
03
mm
0
0787
0
001
in

Second
I
03
0
0012

2
0
0
01
mm
0
0787
0
0004
in

Oil
0
03
0
0012

4
0
0
01
mm
0
1575
0
0004
in

Piston

ring
side
clearance
0
035
0
55
mm

0
0014
0
0022
in

Top
0
04
0
08
mID

0
0016
0
0031
in

Second
0
02
0
06
mm

0
0008
0
0024
in

Oil
0
02
0
06
mm

0
0008
0
0024
in
Piston
to
bore
clearance

Ring

gap
Top
0
35
0
55
mm

0
0138
0
0217
in

Second
0
3
0
5
mm

0
0118
0
0197
in

Oil
0
35
0
55
mm

0
0138
0
0217
in

Top
0
01
0
0004

2
0
03
mm
0
0787
0
0012
in

Second
0
01
0
0004

2
0
03
mm
0
0787
0
0012
in

Oil
0
Q1
0
0004

4
0
03mm
0
I575
0
0012in
Ring
height

Piston

pin

interferenl
c
fit
of

piston
pin
to

piston
o
0
09
mm

0
0
0035

in

0
003
0
013
mm

0
0001
0
0005
in
Clearance
between

piston

pin
a

connecting
rod

bushing

Piston

pin
outer

diameter
21
991
22
0
mm

0
8658
0
8661

in

Connecting
rod

bushing
inner
diameter
21
995
22
008
mm

0
8659
0
8664
in

EMISSION
CONTROL

Crankcase
emission
con
trol
Closed

type

Exhaust
emiision
control
Nissan

Air
Injec
ion

System
Anti
backIrre
valve

Carburettor

Nihonkikaki
D3034C
Type

Model

Duration
time
Air

by

pass

DV54

1
3
L7
sec
at
500

Hg
9
7

in
Hg
Distribu

or
Hitachi
D423

Spark
plugs
BP

6E
Check

valve

Air

pump
Type

Opening
pressure
AMC

0
15

mAq
5
91
in

Aq

Model

Capacity

Pulley
ratio
ECP
20Q
IA

200
cc
rev

120
120
1
00
Cooling
fan

Type

No
of
blades
Spider

4

S16

Fan

coupling

Pulley
ratio
fan
and
water

pump

Tuning
data

Basic

timing

Idling
speed

Distributor
dwell

angle

Spark
plug
gap

Choke

setting

CO

percent
setting
Fan

rpm
water

pump
rpm
3
300

4
000

120
103
Ll71

50
A
T
D
C

700

rpm
650

rpm
automatic

490
550
at
0
02
in
breaker

gap

0
8IJ
0
90
mm

0
03

I
5
0
0355

in

Manual

6
0
I
0
5
air

supply
hose

disconnected

Air

pump
drive
belt

tensioning

Permissible
slackness
of
8
0
12
0

mm
0
3

15
0
4
72
in
under
a

load
of7
1O

kg
1
54
2
20
lb

IGNITION
SYSTEM

DISTRIBUTOR

Type

Firing
order

Rotation

Igntion

timing

Without
emission
control

With
emission
control

Dwell

angle

Condenser

capacity

Advance
characteristics

D416
57
distributor
Hitachi
D416
57

Hitachi
D423
53
with
emission

control

system

134
2

Anti
clockwise

80
B
T
D
C
at
600

rpm

50
A

T
D
C
at
600
r

p
m

49
to
55

degreos

0
20
0

24
1
F
Centrifugal

Start

Maximum

degree
r

p
m

Vacuum

Start

Maximum
degree
r

p
m

Advance
characteristics

D423
53
distributor

Centrifugal

Start

Maximum
degree
r

p
m

Vacuum

Start

Maximum

degree
r

p
m

IGNITION
COIL

Type

Primary
voltage

Spark
gap

Primary
resistance

Secondary
resistance

SPARKING
PLUGS

Type

Gap

Fuel

Systenl

DESCRIPTION

FUEL
PUMP

Testing

FUEL
PUMP

Removing
and

Dismantling

CARBURETTOR

Idling
adjustment

FUEL
LEVEL

Adjusting

STARTING
INTERLOCK
VALVE
OPENING

THROTTLE
VALVE
INTERLOCK
OPENING

CARBURETIOR

Removing
and

Dismantling

DESCRIPTION

A
dual
barrel
down

draught
type
carburettor
is
fitted
to

vehicles
with
the
G
18

engine
A
Stromberg

type
D3034C

carburet

tor
is
installed
on

engines
with
exhaust
emission
controL
and
a

Solex

type
DAK340
carburettor
on

engines
not

equipped
with

this

type
of

system
Both

types
of
carburettors

incorporate
a
550
r

p
m

01
50
at
I
400
16
50
at
2
800

80

mmHg

6
50
at
200

r
p
m

475
r

p
m

01
50
at
1
000
23
50
at
2
600

80
mm

Hg

30
at
120
r

p
m
go
at
400
r

p
m

Hanshin
HM
12F
or

HP5
I
OE

with
emission
control

system

12
volts

more
than
6
mm
0
2362

in

3
8
ohms
at
200C

I
1
2

I
6
8
ohms
at
200
C

NGK
BP

6E

0
7
0
8
mm
0
028
0
031
in
or

0
80
9
mm
0
031
0
035
in

with
emission
control

system

primary
system
for
normal

running
and
a

secondary

system

for
full
load

running
a
float

assembly
which

supplies
fuel
to

both

primary
and
secondary
systems
a
starting
mechanism
and

accelerator

pump
which

provides
a
richer
mixture
on
accelera

tion

SI7

1

D
1

1
I

i
l

I

1
j
j

w
n

I

UJ
1

j

e

tOll
i

j25z
t2JZ2
21

1
S
Mizin
nozzk

2
S
SmtzJJ
v
nturi

3
S
Main

air
bleed

4
S

Slow
jet

5
S

Slow
air
bleed

6
Needle
WIlve

7
Float

8
S
Emulsion
tube

9

S

Mainjd

10

S

Jly
paD
hol

11
S
Throttle

alve

12

Chob
I1tzhe

13
P
Main
air
bleed
14
P
Afuin
nozzle

15
Economizer
bleed

16
P
Slow

jet

17
Slow
onomiur

18
P
Slow
air
bleed

19
Airl
e
nt

20
Lnel

gauge

21

PMainjel

22
Idle

limitler

23
1dl

24
P

Jly

pa
hol

2S
P
Throttle
vahe

Fig
B
l
Sectional
view
of
the
DAK340
carburettor

Coil

Piiton

Strainer

v

cero

Fig
S
3
Electrical
fuel

pump

SI8
A
It
I

IL

o
l

Cfd

rj
1

l
o

j

11
111

r
J

l
l

b

I
1

1
F700
t
vahle

2
Vacuum

piJton

3
P

Slow
air
bleed

4
Slow

jtt

5
Slow

onomUt
T

6
P
Slow
air
bleM

7

Air
Fent

8
P
Main
air
bl
d

9
P
MiJin
nozzle

10
P
SmaU
venturi

1
J
Ozokt
valPe

12

Pumpnozzk

13

Pump
wd6h1

14

Discharft
check
valve

15
S

SnwU
venturi

17
S
Main
air
bleed

18

Step
air
bleed

19

Pump
arm

Fig
B
2
Sectional
view
of
the
D3034C
carburet
tor

fitted
to

engines
with
emiss
ion
control

5Y5tem
20

Step
jet

21

Pump
plunger

22
Inlet
c1r
k
l
aIve

23
S
Mizin

jet

24

lRtzp
uaun

25

lRtzplrragm

26

Step
port

27
Idle

port

28
P
T1vottk
valve

29
Idk

port

30
S
Dw

port

31

Idkadjust
screw

32
P
MiIin

jet

33
Po
NU

jet

34
Float

I

Ul

l

2

1
Fibre
mat

Nvlon
6

Fig
B
4
Fuel

strainer
Fig
Ii

s

Removing
the
fuel

pump
cover

1

The

type
D3034C
carburettor
has
certain
additional

features

These
include
a

power
valve
mechanism
to

improve
the

performance

at

high
speed
a
fuel
cut
off
valve
which
cuts
the
fuel

supply

when
the

ignition
key
is
turned
to
the
off
position
and
an

idling

limiter
to

maintain
the

emissions
below
a

certain
level

Sectional
views
of
the
two

types
of

pumps
are
shown
in

Figs
8
1
and
B
2
An
EP
3
electrical
fuel

pump
is

located
in
the

centre

of
the
spare
wheel

housing
in
the
boot

Fig
B
3
shows
a

sectional
view
of
the

pump
with
its
contact

the
pump
mechanisms

solenoid

relay
and
built
in
filter

The
air
cleaner
uses
a

viscous

paper
type
element
which

should
be

replaced
every
40
000
km
24
000
miles

Cleaning

is
not

required
and
should
not
be

attempted

The

cartridge
type
fuel
strainer

incorporates
a
fibre
clement

which
should
be
renewed
at
inervals
not

exceeding
40
000
km

24
000
miles
Fit
B
4
shows
a
sectional
view
of

the
assembly

The
fuel
lines
should
not
be
disconnected
from
the
strainer
when

the
fuel
tank
is
full

unless
absolutely
necessary
as
the
strainer

is
below
the
fuel
level

FUEL
PUMP

Testing

Disconnect
the
fuel
hose
from
the

pump
outlet
Connect

a
hose
with

an
inner
diameter
of
approximately
6
mm
0
024

in
to

the

pump
outlet
and

place
a

container
under
the
end
of

the

pipe
Note
that
the
inner

diameter
of
the

pipe
must
not
be

too

small
or

the
pipe
will
be

incapable
of

delivering
the
correct

quantity
of
fuel
when

testing
Hold
the
end
of
the
hose
above
the

level
of
the

pump
and

operate
the

pump
for
more
than
IS

seconds
to
check
the

delivery
capacity
The

capacity
should
be

I
400
cc

3
24
U
S

pts
in
one
minute
or
less
The

pump
must

be
removed
from
the
vehicle
if
it
does
not

operate
or
if
a

reduced

quantity
of
fuel
flows
from
the
end
of
the
hose
Remove

the
pump
from
the
vehicle
and
test
as
follows

Connect
the

pump
to
a

fully
charged
battery
If
the

pump

now

operates
and

discharges
fuel

correctly
the
fault
does
not

lie
in
the

pump
but

may
be
attributed
to

any
of
the

following

causes

Battery
voltage
drop

poor
battery
earth
loose

wiring

loose
connections
blocked
hoses
or
a

faulty
carburettor

If
the

pump
does
not

operate
and

discharge
fuel
when

connected
to
the

battery
then
the

pump
itself
is

faulty
and

must
be
checked
as
follows

First
make
sure
that
current
is

flowing
This
will
be
indica

ted

by
sparking
at

the
tenninals
If
current
flows
the
trouble
is

caused

by
a

sticking

pump
plunger
or

piston
The

pump
must

be
dismantled
in

this
case
and
the

parts
thoroughly
cleaned
in

petrol

If

the
current
does
not
flow
a
coil
or
lead
wire
is
broken

and
the

pump
must

be
renewed
A

reduced
fuel
flow
is
caused

by
a

faulty
pump
inlet
or

discharged
valve
or
blocked
filter

mesh
The

pump
must

of
course

be
dismantled
and
serviced
as

necessary

FUEL
PUMP

Removing
and

Dismantling

Remove
the
bolts

attaching
the
fuel

pump
cover
to

the

floor

panel
see

Fig
B
S
Remove
the
bolts

attaching
the

pump
to
the
cover

2
Disconnect
the
cable
and
fuel
hoses
Withdraw

the

pump
Dismantle
as
follows

Slacken
the

locking
band
screws
and

remove
the
strainer

strainer

spring
filter
strainer
seal
and

locking
band

Remove
the

snap
ring
Withdraw
the
four
screws
from
the

yoke
and
remove

the
electromagnetic
ulJ
it
Press
the

plunger
down
and
withdraw
the
inlet
vaive

the

packing

and
the
cylinder
and

plunger
assembly

A
defective
eledrical
unit

cannot
be
dismantled
as

it
is

sealed
and
must

be
renewed
as
a

complete
unit

FUEL
PUMP

Inspection
and

Assembly

Wash
the
strainer
filter
and

gasket
in

petrol
and

dry
using

compressed
air
Renew
the
filter
and

gasket
if

necessary
Note

that
the
filter
should
be
cleaned
every
40
000

km
24
000

miles
Wash
the

plunger
piston
and
inlet
valve
in

petrol
and

make
sure
the

piston
moves

smoothly
in
the

cylinder
Replace

the

parts
if
found
to
be
defective

Insert
the

plunger
assembly
into
the

cylinder
of
the
electri

cal
unit
and
move

the

assembly
up
and
down
to

make
sure
tha
t

the
contacts
are

operated
If
the
contacts
do
not

operate
the

electrical
unit
is

faulty
and
must

be
renewed

Assembly
is
a
reversal
of

the
dismantling
procedures
tak

ing
care
to
renew
the

gaskets
as

necessary

CARBURETIOR

Idling
Adjustment

The
D3034C
carburettor
fitted
to

engines
equipped
with

an
emission
control

system
must
be

adjusted
as
described
under

the

heading
IGNITION
TIMING
AND
IDLING
SPEED
in
the

section
EMISSION
CONTROL
SYSTEM

Reference
should
be
made
to
carburettor

idling
adjustment

procedures
for
the
L14
L16

and
LI8

engines
when

adjusting

the
type
DAK
340
carburettor
fitted
to
the
G
18

engine
A
smooth

engine
speed
of

approximately
550

rpm
should
be
attained
in

this
case

FUEL
lEVEL

Adjustment
DAK
340earburettor

A
constant
fuellevcl
in
the
float
chamber
is
maintained

by

the
float
and
needle
valve
See

Fig
8
6
If

the
fuel
level
does
not

correspond
with
the
level

gauge
line
it
will
be

necessary
to

care

fully
bend
the
float
seat
until
the
float

upper
position
is

correctly

set

The
clearance
H
between
valve
stem
and
float
seat

should

be
I
5
mm
0
0059
in
with
the
float

fully
lifted

Adjustment

can
be
carried
out

by
carefully
bending
the
float
stopper
3

FUEL
lEVEL

Adjustment
D3034Ccarburettnr

The
fuel
level
should

correspond
with
the
level

gauge
line

Adjustment
can

be
carried
out
if

necessary
by
changing
the

gaskets
between
the
float
chamber

body
and
needle
valve
seat

The
gaskets
are
shown
as
item
4
in

Fig
B
7
When

correctly

adjusted
there
should
be
a

clearance
of

approximately
7
mm

0
027
in
between
float
and
chamber
as
indicated

STARTING

INTERLOCK
VALVE
OPENING

The

choke
valve
at
its

fully
closed
position
automatically

opens
the
throttle
valve
to
an

optimum
angle
of
14

degrees
on

the

type
DAK
340
carburettor
and
13
5

degrees
on
the
D3034C

carburettor
With
the
choke
valve

fully
closed
the
clearance

G

I
in

Fig
8
should
be
1

I
mm
0
0433

in
This
clearance

S19

Onter
1

2

I

J
I

I

I
r

f
r

1
Float
SelllC

2
F10aI

3
Ffotzt
toppt
T

4

Nudk
m
1
F10at

2

Float
WJlve
ltat

3
Float
valJ1e

4

AcJiwtiflK
tpsket

5

Stopper

Fig
B
6

Adjusting
the
fuel
level
DAK340
C3tbutettor

Fig
B
7

Adjusting
the
fuel
level
D3034C

carburettor

1

11

J
Xi

I

tf
J
t

I

3

J

I

J
Th

1
Choke
mr

r
2

Otoke
m

LuL
3

Conn
ting
rod

4
Connectinlla
o

5
TIuottle
lever

Fig
B
S
Adjusting
the

starting
interlock

opening

6
O
1
Co1UJeCdrlK
lev

2
Rerum

plate

3

Adiust
pWe

4
17rrottle
clrzmber

5
Throttle
valve
1
S
Throttle
arm

2
S

Throttle
ntum
lever

3
Link

4
P1lIrortle
tml

5
P

1lIro
lle
valve

l

I

4
J
L

5
iF
l

1

L

Fig
B
9

Adjusting
the
throttle
valve
interlock

opening
OAK340
carburettor
Fig
B
lO

Adjusting
tbe
throttle
valve
interlock

opening
D3034C

carburettor

520

between

primary
throttle
valve

and
the
wall
of
the
throttle

chamber
can

be

adjusted
if

necessary
by
carefully

bending
the

choke

connecting
rod
3

THROTILE

VALVE
INTERLOCK
OPENING

With

the

primary
throttle
valve
of
the

type
DAK340

carburettor

opened
to
600
as
shown

in
Fig
B
9
the

adjusting

plate
3
should
contact

the

connecting
lever

J
This

being

the

point
before
the

secondary
throttle
valve
is

brough
into

operation
The

linkage
between

primary
and

secondary
throttles

is

working
correctly
if
the
clearance

G
between

primary
throttle

valve
and
the
wall
of
the
chamber
is
738
mm
0
3937
in

Adjust
if

necessary
by
carefully

bending
the
adjusting

plate
at

point
A
until
the
correct

setting
is
obtained

With
the

primary
throttle
valve
of
the

type
D3034C
car

burettor

opened
at
an

angle
of
500
the

connecting
link
3
in

Fig
B
IO
should
ge
at
the
extreme
left
of
the
slot
in
the
throttle

ann
4
With
the

linkage

positioned
as

shown
measure

the

clearance
between

primary
throttle
valve
and
the
wall
of
the

chamber
as
described
for
the
DAK340

carburettor

Adjustment

can

be
made
if

necessary
by
bending
the

connecting
link
until

the
correct
clearance
is
obtained

CARBURElTOR

Removing
and

Dismantling

The
carburettor
can
be
removed

by
following
the

instruc

tions

previously
given
for
carburettor
removal
on
the
Ll4
L16

and
LIB

engines

Dismantle
the
type
DAK340
carburettor
as
follows

Remove
the

primary
throttle
return

spring
Take
off
the

E

ring
and
remove

the
pump
and

connecting
rod
Remove
the

split
pin
and
choke

connecting
rod
Remove
the

secondary

throttle
return

spring
Remove
the
choke
wire
arm
choke
valve

shaft
and
valve

spring
Take
off
the

clip
and
remove

the
choke

lever
and

spring
To
dismantle
the
float
chamber
take
off
the

diaphragm
cover
and
remove
the

spring
and

diaphragm
Remove
the

diaphragm
chamber
and

gasket
Take
off

the
float
chamber

cover
and
remove
the

gasket
level

gauge
rubber
seal
and
float

Remove
the
screw
from
the
filter
and
withdraw
the

nipple

and
filter
Remove
the

needle
valve
Take
off
the

cylinder

cover

and

pump
cover

and
withdraw
the

piston
piston
return

spring
and
inlet
valve
Remove
the

primary
main
air
bleed
the

secondary
main
air
bleed
and
emulsion
tube
Take

off
the

small
venturi
and
remove
the

primary
and

secondary
slow

jets

and
slow
air
bleeds
Remove
the
drain

plugs
and
take
out
the

primary
and

secondary
main

jets

To
dismantle
the
throttle
chamber
remove
the
throttle

adjusting
screw
and

spring
and
the
idling
adjusting
screw
and

spring
Withdraw
the
throttle
lever

spring
hanger
sleeve

connecting
lever
return

plate
and

adjusting
plate
Withdraw

the

primary
throttle
valve
and

primary
throttle
shaft
Withdraw

the

secondary
throttle
valve
and

secondary
throttle
shaft

The

type
D3034C
carburettor
can
be
dismantled
as
follows

Detach
the

starting
connecting
rod
from
the
choke

lever
and

accelerator

pump
connecting
rod

Remove
the
air
horn

pump
rod
slow

jets
the

primary
and

secondary
small
venturies
Detach
the

primary
and

secondary

linkages
Take
off
the

diaphragm
chambe
cover
and
take
out

the

spring
and

diaphragm
Remove
the

diaphragm
chamber
and

gasket
Separate
the
float
chamber
from
the
throttle
chamber

take
off

the
float
chamber
cover
and
remove
the

components

Remove
the
inlet
strainer
and
float
valve
seat
Remove
the
main

jets
and

take
off
the
fuel

cut
off

valve

CARBURETTOR

Assembly
and
Installation

The

assembly
and
installation
of
the
carburettor
is
a

reversal
of
the

dismantling
and
removal

procedures

Clean
and

inspect
all

components
as
described
for
the

carburettors
fitted
to
the
Ll4
Ll6
and
LI8

engines

TechnIcal
Data

CARBURETIOR
Small
ven
turi

First
7mm

8mm

Carburettor

Type
DAK340
Second
14mm
16mm

Main

jet
02
155

Primary
Secondary
Slow

jet
50
80

Main
air
bleed
60
80

Outlet
diameter
30mm
34mm
Emulsion
hole
0
5
mm
O
5mm

Venturi

diameter
23
mm

29
x
9
mm

Slow
air
bleed

Main

jet
119
165
First
160

Main
air
bleed
220
100

Second
150
220

Slow

jet
48
90

Slow
economizer
1
6
mm

dia

Slow
air
bleed
130
100

Power

jet
50

Slow
economizer
L4mm

Cushion

jet
120

Economizer
bleed
1
2mm

Air

jet
150

Carburettor

Type
D3034C
Power

system
Vacllum

acting

Vacuum

piston
diameter
9
0
mm
0
354
in

Primary

Secondary
Piston

spring
100

gr
0
220
Ibs
31
mm

1
22
in

Bore
30mm
34mm
Power
valve

spring
40

gr
0
0882
lbs
8
6mm

Large
venturi
23mm

28mm
0
34
in

52