1973 DATSUN B110 ECO mode

The
model
3N71
B

automatic
trans

mission
is
a

fully
automatic
unit
con

sisting

primarily
of
element

hydrau

lic

torque
converter
and
two

planetary

gear
sets
Two

multiple
disc

clutches
a

muItiple
disc
brake
a
band
brake
and

a

one

way
sprag
clutch

provide
the

friction
elements

required
to

obtain

the

desired
function
of
the
two

plane

tary
gear
sets

The

two

planetary
gear
sets

give

three

forward
ratios
and
one
reverse

Changing
of
the

gear
ratios
is

fully

automatic
in

relation
to

vehicle

speed

and

engine

torque
input
Vehicle

speed

and

engine
manifold
vacuum

signals

are

constantly
fed
to
the
transmission

to

provide
the

proper
gear
ratio

for

maximum

efficieq
cy
and

performance

at
all

thrqttIe
openings

The

iMiij
l

3N7I
B
has

six
selector

position
f

P
R
N
D

2
1

k
Park

position
positively
locks

the

c
ut

put
shaft
to
the
transmission

case

RY
means
of
a

locking
pawl
to

prev
nt
the
vehicle

from

rolling
either

direction

This

position
should
be
selected
when

ever
the

driver
leaves
the

vehicle

The

engine
may
be
started
in
Park

pQlition

OR
Reverse

range
enables
the

vehicle
to
be

operated
in

a
reverse

direction

N
Neutral

posItion
enables
the

engine
to
be

started
and
run
without

driving
the
vehicle
CHASSIS

DESCRIPTION

D
Drive

range
is
used
for

all

normal

driving
conditions

Drive

range
has

three

gear
ratios
frum

the

starting
ratio

to
direct
drive

2
2

range
provides
performance

for

driving
on

slippery
surfaces
2

range
can
also

be
used

for

engine

braking

2

range
can
be

selected
at

any

vehicle

speed
and

prevents
the
trans

mission
from

shifting
out

of
second

gear

I

range
can
be

selected
at

any
vehicle

speed
and
the
transmission

will

shift
to
second

gear
and

remain
in

second
until

vehide

speed
is

reduced

to

approximately
40
to
50

kmfh
25

to
31

MPH

I

range

position
prevents
the

transmission
from

shifting
out
of
low

gear
This
is

particularly
beneficial

for

maintaining
maximum

engine
braking

when
continuous

low

gear

operation
is

desirable

The

torque
converter

assembly
is

of

welded
construction
and
can
not
be

disassemble
for
service

Fluid
recommendation

Use

having

only
in

mission
automatic

transmission
fluid

DEXRON
identifications

the
3N7I

B
automatic
trans

AT
2
IA
e

l
csr
4o

J

r
s

Identification
number

Stamped
position

The

plate
attached
to

the

right

hand

side
of
transmission
case
as

shown
in

Figure
AT
I

ii

II

r

4
1
r

I

to
i

AT057

Fig
AT
1

Identification
number

Identification
of
number

arrangements

See
below

Model
code

JAPAN

AUTOMATIC

Z
TRANSMISSION
CO
LTD

I
MODEL

XOIOO

J
I
NO
2412345

Unit
number

Number

designation

2
4
2
3
4

5

L

Seriat

production

number

for
the

month

Month
of

production

X
Oct
Y
Nov
Z

Dec

Last

figure
denoting

the

year
A
D

r

AUTOMATIC

TRANSMISSION

Manual

linkage

The
hand
lever
motion

The
hand

lever
is
located

in
the
driver

s
com

part

men

mechanically
transmitted
from

the
remote
control

linkage
is
further

transmitted
to
the
inner
manual

lever

in

the
transmission

case
from
the

range

selector
lever
in

the

right
center

poc

tion

of
the

transmission
case

through

the
manual

shaft
The
inner

manual

lever
is

thereby
turned

A

pin
installed
on

the
bottom
of

the
inner
manual
lever
slides
the

manu

al

valve

spool
of
the

control
valve
and

thus
the

spool
is

appropriately
posi

lioned

opposing
to

each
select

position

The

parking
rod

pin
is

held
in
the

groove
on
the

top
of
the
inner

manual

plate
The

parking
rod

pin
operates
the

rod
at
p

range
and

operates
the

mechanical

lock

system

Moreover
the
above
described

manual
shaft
is

equipped
with
an

inhibitor
switch
A

rotor
inside
the

inhibitor
switch
rotates
in

response
to

each

range
When
the

range
is
selected

at
p
or
N
the

rotor
closes
the

starter

magnet
circuit
so
that
the

engine
can

be
started
When
the

range

is
selected

at
R
the

rotor
closes
the

back

up
lamp
circuit
and
the

back

up

lamp
lights

Vacuum

diaphragm

The
vacuum

diaphragm
is
installed

un
the
left

center

portion
of
the

transmission
case
The

internal
con

struction
of
the
vacuum

diaphragm
is

as
follows
A
rubber

diaphragm
forms

a

partition
in
the
center
The

engine

intake
manifold

negative
pressure
led

through
vacuum
tube
and

spring
force

are

applied
to
the
front
surface
of
the

rubber

diaphragm
and

atmospheric

pressure
is

applied
to
the
back
surface

A
difference
between
pressure

applied

to

the
front
and
back
surfaces
be

comes
a

vacuum
reaction
and
thus

the
throttle
valve
of
the

control
valve

inside
the
transmission
case
is

op

erated

When
accelerator

pedal
is

fully
de

pressed
and
the
carburetor
is

fully

upened
but
the

engine
speed
is
not
1

Housing

2
Cover

3

Outer
gear
AT071

4
Inner

gear

5
Crescent

Fig
AT
3
Oil

pump

1

Manual

plate

2

Inhibitor

switch
A
TOB7

3

Parking
rod

4
Manual

shaft

Fig
AT
4

Manuallinhage

To
intake
manifold

A

TOBB

Fig
A
T
5

Vacuum
diaphragm

iV

Down
shift
solenoid
i

KiCk
down

switch

A

TOB9

Fig
A
T
6

Downshift
solenoid

AT
5
sufficiently
increased
the
manifold

negative
pressure
lowers

becomes

similar
to
the

atmospheric
pressure

and
the

vacuum
reaction

increases

since

the
flow

velocity
of
mixture

inside
the
intake
manifold
is

slow

Contrarily
when
the

engine
speed

increases
and

the
flow

velocity
of

the

mixture

increases
or
when

the
carbure

tor
is
closed

the
manifold

negative

pressure
increases
becomes
similar
to

vacuum
and
the

vacuum
reaction

reduces

Thus
a

signal
to

generate
hydraulic

pressure
completely
suited
to

the

engine

loading
at
the

control
valve
is

transmitted
from

the
vacuum
dia

phragm
and

most
suitable

speed

change
timing
and
line

pressure
are

obtained
so

that
the
most

proper

torque
capacity
is

obtained

against
the

transmitting

torque

Downshift

solenoid

The
downshift

solenoid
is

of
a

magnetic
type
installed

on
the
left
rear

portion
of
the

transmiSsion
case

When

a

driver

requires
accelerating
power

and

depresses
the
accelerator

pedal

down
to

the

stopper
a

kick
down

switch

located
in
the

middle
of
the

accelerator
link
is

depressed
by
a

push

rod
the
kick
down
switch
closes
cur

rent
flows
to

the
solenoid
the
sole

noid

push
rod
is

depressed
the

down

shift
valve
of

the
control
valve
inside

the
transmission

case
is

depressed
and

the

speed
is

changed
forcedly
from

3rd
to
2nd
within
a

certain
vehi

cle

speed
limit

Note
As
the
kick
own

switch
closes

when
the
accelerator

pedal
is

depressed
from
7
8
to
IS
16
of

the
whole
stroke
the

accelera

tor

pedal
should
be

correctly

adjusted
and
fixed
so
as
to

afford

complete
stroke

The

arrangement
of
the
switch

differs

according
the
models
of

vehicle

Governor
valve

The

primary
and

secondary
gover

nor
valves
are
installed

separately
on

the

back
of
the
oil
distributor
on

the

Assembly

I

Prior
10

assemlbing
dip
all

parts

in

clean
automatic

transmission
fluid

Reverse

disassembly
procedure
to

assemble
brake

2
Use
extreme
care
to

avoid

dam

aging
rubber

ring
when

installing
seal

lace

3
Blow

under

pressure
air
from

apply
side
of

piston
to
lislen
for
defi

nite

piston

operation
as

shown
in

Figure
AT

93

4

With

appIy
side
of

piston
plugged

with

thumb
blow
air
under

pressure

into

cylinder
from
release

side
as

shown
in

Figure
AT
94
If
retainer

is

raised
a
little
it
is

an
indication
that

attaching
bolts

are
loosened

calling

for

retightening

Governor

Disassembly

l

Separate

governor
from

oil
dis

tributor

by

unscrewing

attaching
bolts

2
To

disassemble

secondary
gover

nor

remove

spring
seat

spring
and

secondary
governor
valve
from
valve

body
in

this

written
order
as
shown
in

Figure
AT
95

3

If

primary

governor
is

to
be
dis

assembled
for

any
purpose
remove

spring
seat

primary
governor
valve

spring
and

spring
eal
CHASSIS

I
Anchor
end

pin

2
Band

strut

3

Return

spring

4

Piston
stem

5
Band

servo

piston

6
Release

7

Apply

8

Servo

piston

relainer

9

Transmission
case

10

Band
brake

AT074

Fig
A
T
92
Sectional
view

of
servo

piston

Fig
A
T
93

Testing
piston

Apply
side

Fig
A
T
94

Testing
pi8ton

Rele
side

Inspection

I

Check
valve
for

defective
condi

tion

Replace
spring
if

found

weaken

ed
too

badly
beyond
use
Defective

piston
should

also
be

replaced
with

a

new
one

2
Examine
if

primary

governor

slides

freely
without

binding

3

To
determine

if

secondary
gover

nor
is
in

good
condition
blow

air

under

light
pressure
into
hole
at

A

to

listen
for
noise

like
a

model

plane

AT
44
r
To
control

valve

Governor

pressure

15

1

4

From
control

valve

Line

pressure
I

I

Primary

governor

2

Secondary
governor

3

Governor
valve

body
A
TogO

4
Oil

distributor

5

Output
shaft

Fig
A
T
95

Testing
secondary

governor

Assembly

Reverse

disassembly
procedure
to

assemble

governor

Note
Do
nol

confuse

primary
gover

nor

wilh

secondary
governor

After

instaDation
check
to
be

sure
that

spring
is
nol

de

flecled

Oil

pump

Disassembly

I

Free

pump
cover
from

pump

housing
by

removing
attaching
bolts

2
Take
out
inner
and

outer

gears

from

pump

houisng

Inspection

1

Inspect
gears
for
wear
or

damage

to

gear
leeth

Replace
rubber

ring
if

found

damaged
excessively

beyond

use

2

Using
a

straight
edge
and
feelers

measure

pump
and

gear
clearances
as

follows

Clearance
between
inner

or
outer

gear
and

pump
cover
See

Figure

AT
96

Standard
clearance

0
02

to
0
04
mm

0

0008
to
0
0016
in

Replace
if

going
over
0

08
mm

0
0031
in

@

wWD@R

l
u

DJlliJ
1
SECTION

GI

DATSUN
1200

MODEL
B
11

0
SERIES
GENERAL

INFORMATION

I
NISSA

NISSAN
MOTOR
CO
LTD

TOKYO
JAPAN
MODEL
VARIATION
GI
I

IDENTIFICATION
NUMBER
GI
I

JACKING

UP
AND

TOWING

GI
3

THE
CAR

APPROXIMATE
REFILL

GI
5

CAPACITY

RECOMMENDED

LUBRICANTS
GI
5

NISSAN
LONG
LIFE

GI
7

COOLANT
L
L

C

r
em

EMISSION
CONTROL
AND

TUNE
UP

Checking
and

adjusting
dash

pot

automatic
transmission
model

only

Check

operation
of
dash

pot
It
should

not
be
cracked

or

bound
It

is
also
essential
to
check
to
be
certain

that
it

is
in

correct

adjustment

L
Check
to
be
sure
that
dash

pot
contacts

stopper
lever

when

engine
speed
reaches
1
900

to
2

000

rpm

2

Engine
should
be
slowed
down
from
3

000
to
1

000

rpm
within
a
few

seconds

Readjust
dash

pot
or

replace
it
with
a
new
one
if
it

fails

to
meet

the
above

conditions

Checking
carburetor
return

spring

Check
throttle
return

spring
for

sign
of

damage
wear

or

squareness
Discard

spring
if
found
with

any
of
above

excessively
beyond
use

Checking
choke
mechanism

choke
valve
and

linkage

1

Check
choke
valve
and

mechanism
for
free

operation

and
clean
or

replace
if

necessary

A

binding
condition

may
have

developed
from

petro

leum

gum
for
motion
on
choke
shaft
or

from

damage

2

Check
bimetal
cover

setting
position
The

index
mark

of
bimetal
cover
is

usually
aligned
at
the

middle

point
of

the
scale

Note
When
somewhat
over
choked
turn
bimetal

caver

clockwise

slightly

3
Prior
to

starting
check
to
be
sure
that

choke
valve

closes

automatically
when

pressing
down
on
accelerator

pedal

Should
it
fail
to
close

automatically
the
likelihood
is

that
fast
idle
cam
is
out
of

proper

adjustment
or

that

bimetal
is

not

properly
adjusted
calling
for

adjustment

Refer
to
Carburetor
in
Section
EF

Page
EF
15
Checking
anti

dieseling
solenoid

If

engine
will
not

stop
when

ignition
switch
is
turned

off

this
indicates

a

striking
closed
solenoid
valve

shutting
off

supply
of
fuel
to

engine
If
harness
is
in

good

condition

replace
solenoid
as
a
unit

To

replace
proceed
as
follows

Removal

and
installation

of
anti

dieseling
solenoid

Removal

Solenoid
is
cemented

at

factory
Use

special
tool

STl
91
50000
to
remove
a

solenoid

When

this
tool
is

not
effective
use
a

pair
of

pliers
to

loosen

body
out
of

position

lnstalltion

I
Before

installing
a
solenoid
it
is

essential
to
clean

all
threaded

parts
of
carburetor

and
solenoid

Supply

screws
in
holes
and
turn
them
in

two
or

three

pitches

2
First
without

disturbing
the
above

setting
coat
all

exposed
threads
with
adhensive
the

Stud
Lock
of

LOCTlTE
or

equivalent

Then

torque
screws
to
35
to
55

kg
cm
30

to
48
in

lb

using
a

special
tool
STl9150000

After

installing
anti

dieseling
solenoid
leave
the
carbu

retor
more
than
12

hours
without

operation

3

After

replacement
is
over
start

engine
and
check

to
be
sure
that
fuel
is
not

leaking
and
that
anti

dieseling
solenoid
is
in

good
condition

Notes
a
Do
not
allow
adhesive

getting
on
valve

Failure
to
follow
this
caution
would
result
in

improper
valve

performance
or
clogged
fuel

passage

b
I
n

installing
valve
use
caution
not
to
hold

body
directly
Instead

use

special
tool

tighten

ing
nuts
as

required

ET
9

EMISSION
CONTROL
AND

TUNE
UP

Operation
manual
transmission

equipped
model

The

operation
of
the
solenoid
is

by
means
of
the

movement
of

the

speedometer
needle

When
vehicle

speed
falls
below
16

km
h

10

MPH
the

needle
movement

produces
a

signal
which
in
turn
is

amplified
to
actuate
the

solenoid

I
Vehicle

speed
Speed
Throttle

Throttle

switch
opener

opener

solenoid

Below
16
km
h
Not

10
MPH
ON
ON

actuated

Above

16
km
h

OFF
OFF

Actuated

10
MPH

Operation
automatic
transmission

equipped
model

The

solenoid
is

operated
by
an
inhibitor

switch
which

actuates
the
solenoid

only
when
the
transmission
is

placed
in

the
N
or
P

position

c
fil

rn

AT057

Fig
ET
18

Inhibitor
switch
installation

Checking
and

adjusting
throttle

opener

Principally
it
is

unnecessary
to

adjust
the
throttle

opener
however
if
there
is

any
requirement
the

adjust

ment

procedure
is
as

follows

Prepare
the

following
tools

1
A

tachometer
to
measure
the

engine

speed
and
a

screwdriver

2
A
vacuum

gauge
and

connecting
hose

ET
13
Notes
a
A

quick

response
boost

gauge
such

as
Bour

don
s
tube

type
is
recommended
Do
not

use

mercury
manometer

b

Any
special
tools

are
not

required

Warming

up

Warm

up
engine
until
it
is
heated

to

operating

temperature
Make
sure
that

the
automatic
choke
valve

is

fully
open

Connecting
vacuum

gauge

Disconnect
vacuum
hose
between
intake

manifold
and

automatic

temperature
controlled
air

cleaner
install

a

vacuum

gauge
to
intake
manifold
connector
as
shown

in

Figure
ET

19

1
Intake
manifold

2
Connector

3
Vacuum

gauge
4
Vacuum
control
valve

5
Throttle

opener

solenoid

Fig
ET
19

Adjusting
throttle

opener

Deenergizing
solenoid

Disconnect
throttle

opener
and
vacuum

cutting
valve

solenoid
harness

and
free
solenoid

Adjusting
idling

Check
the

engine
idling
Adjust
if

necessary

Engine
idling

rpm
Idling

timing

I
CO

degree

SO

BTDC

I
L51c0
5

SO

BTDC

I
I
S
1c
0
5
M
T
Car

A
TCar
800

6S0
in
D

FUEL

SYSTEM

When
the

temperature
of

suction
air
around
the
sensor

reaches
430C

1l00F
and
above
the
sensor

actuates
to

open
the
air

control
valve

When
the

temperature
of

suction
air
around
the
sensor

further
rises
and

reaches
above
490C

I200F
the
air
control
valve

completely

opens
to

prevent
the

entrance
of
hot

air
and

aHows

underhood
air

alone
to
be
introduced

into
the
carburetor

See

Figure
EF4

u

C
I

1f1

lL
GJ

J
To
manifold

ECOOB

j
1
Air
inlet

pipe

2
Air
control
valve

3

Diaphragm
spring

4

Diaphragm

5
Vacuum
hoses

6
Air
bleed
valve

fully

open

7
H
t
air

pipe

8

Temperature
sensor

a5

mbly
Under
hood
air

I
I

Fig
EF
4

Underhood
air

delivery
mode

during
hot

engine
operation

The
air
control

valve
acts
in

the
manner
described

above
the

temperature
of
suction
air

around
the
sensor
is
always
kept
about
460C

I150F
See

Figure
EF
5

r
9

t
t
T
I

I

I

fY
ID

I

J
To
manifold

E
C009

I
Air
inlet

pipe

2
Air
control
valve

3

Diaphragm
spring

4

Diaphragm

5

Vacuum
hoses

6
Air

bleed
valve

partially

open

7
Hot
air

pipe

8

Temperature
sensor

assembly
Under
hood
air

J

Hot
air

Fig
EF
5

Regulating
air

delivery
mode

EF
3

FUEl
SYSTEM

Secondary
throttle
valve

is

operated
by
throttle
lever

The

high

power
and

good
acceleration
are

gained
with

combination
of

the

auxiliary
valve

2

Accelerating
pump
gives
excellent

acceleration

3

The

power
valve
mechanism
is
of
a

vacuum
actuated

boost

type
and

improves

high
speed
driving

4
The

throttle

opener
control

system
Refer
to
Section

ET

incorporates
a

servo

diaphragm
The
servo
dia

phragm
helps
open
the
throttle

valve
at
a

decreasing
speed

so
as

to
reduce

the
emission
of

hydrocarbons
to
a

minimum

5
An

anti
dieseling
solenoid

is
used
as
a

means
of

preventing
dieseling
When
the

ignition
key
is
turned
off
the
fuel

passage
involved
in
the
slow

system
is

closed

and
the
fuel

supply
is
shut

down

completely

6
In

the
choke

mechanism
an

electric
automatic

choke

is
used
to

automatically
control
the
choke
valve

operation

during
the
warm

up
of
the

engine

7
The
carburetor

for
automatic
transmission
is

equipped
with
so
called

dash

pot
that

is
it
makes
smooth

decelerating
without

engine
stall
at

any

operating
condi

tion

These

carburetors
are

quite
similar
in

appearance
as

explained
above

except
the

dash

pot
for
the
au
tomatic

transmission
model
The

differences
in

performance
are

explained
in
the

following
as

necessary

for
Manual
transmission

for
4utomatic
transmission

Fig
EF
14
External
view

of
carburetor

STRUCTURE
AND
OPERATION

These

carburetors
consist
of

the

primary
system
for

normal

running
and

secondary
system
for
full

load

running
The

float

system
which
is

commonly
used

by
the
primary
and

secondary
systems
the

secondary
switch
over

mechanism

accelerating
mechanism
etc
are

also
at

tached

The
anti

dieseling
solenoid
valve
and
the

power
valve

mechanism

are
used

The

carburetor
is
of
down
draft
two
barrel

type

EF
9