1973 DATSUN B110 brake fluid

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

Fig
A
T
49

Torque
converter

aligning
cut

3
When

connecting
torque
con

verter

to
transmission

measure
dis

tance
A

to
be

certain
that

they
are

correctly
assembled
See

Figure

AT
50

Distance
A

More
than
16
5
IllIll

0
650
in

A

AT117

Fig
A
T
50

Installing
torque
converter
CHASSIS

4
Bolt
converter
to
drive

plate

Tightening
torque

0
8

to
1
0

kg
Ill
5
8
to
7
2
ft
Ib

Note

Align
chalk

marks

painted
a

cross

both

parts
during
disas

sembling
processes

5

After
converter
is
installed

rotate

crankshaft

several
turns
and
check
to

be
sure
that

transmission
rotates

freely

without

binding

6
Pour

recommended
automatic

transmission
fluid

up
to

correct
level

through
oil

charge

pipe

7

Connect
manual

lever
to

shift

rod

Operation
should
be
carried

out

with
manual
and

selector
levers
in

N

8
Connect

inhibitor
switch
wires

Notes

a
Refer
to

covering
topic

under

Checking
and

adjusting

inhibitor
switch
on

page

AT
51

b

Inspect
and

adjust
switch
as

above
whenever
it
has

to
be

removed
for

service

9
Check
inhibitor
switch
for

op

eration

AT
34
Starter
should

be

brought
into

op

eration

only
when
selector
lever
is
in

P
and
N

positions
it

should
not

be

started
when
lever
is
in
D

2

1
and
R

positions

Back

up
lamp
should
also

light

when
selector
lever
is

placed
in
R

position

10
Check
level
of
oil
in

transmis

sion
For
detailed

procedure
see

page

AT
49

II
Move

selector
lever

through
all

positions
to
be
sure
that
transmission

operates
correctly

With
hand
brake

applied
rotate

engine
at

idling
Without

disturbing

the

above

setting
move

selector
lever

through
N

to
D

to
2
to
I

and
to
R
A

slight
shock
should
be

felt

by
hand

gripping
selector
each

time
transmission
is

shifted

Note
See

page
AT

50
for

checking

enigne

idling

12

Check
to
be

sure
that
line

pres

sure
is
correct

To

do
this
refer
to

relative

topic
under

Testing
line

pres

sure
on

page
AT
53

13

Perform

stall
test

as

per
the

instructions
on

page
AT

51

3

Blowout

piston
by
directing
a

jet

of
air
into

hole
in

clutch
drum
See

Figure
AT
S
7

AT155

Fig
AT
87

Blowing
out

piston

Inspection

Refer
to

covering
topic
under

Front
Clutch

Assembly

Assembly
is

reverse
order
of
disas

sembly
Dip
all

parts
in

clean
auto

malic
transmission

fluid
before

as

sembling
Note
that
the
number
of

drive
and
driven

plates
varies
with

types
of
vehicles
For

details
refer
to

Service
Data

Specifications

I
After
rear

clutch
is

assembled

check

to
be

sure
that

clearance
be

tween

snap
ring
CD
and

retaining
plate

CV
is
held
within

prescribed
tolerances

See

Figure
A

T
S8

Specified
clearance

1
0

to
1
5

mm

0
039

to
0

059
in

AT1S6

Fig
A
T
88

Measuring
ring
to

plate

clearance

2

Testing
rear
clutch

Install
rear
clutch
on

oil

pump

cover

Blow
air
under

pressure
into
oil

hole
to
listen
for

definite
clutch

opera

tion

as
shown
in

Figure
AT
S9
AUTOMATIC
TRANSMISSION

AT157

Fig
AT
89

Testing
rear
clutch

Low
reverse
brake

Disassembly

I

Follow

steps
as

per
instructed
on

page
AT

38

2

Blowout

piston
by

directing
a

jet

of
air
into
oil

hole
in
clutch

piston

Inspection

I

Check
drive

plate
facing
for
wear

or

damage
if

necessary
replace
Refer

to
Service
Data

Specifications
for

limits

2
Test
if

piston
return

spring
is

not

weakened

Discard
if

weakened
too

badly
beyond
use

3

Replace
any
defective

parts
with

new

ones

Assembly

1
After
low

reverse

piston
is

installed
assemble
thrust

spring
ring

return

spring
thrust

washer
and
one

way
clutch
inner
race

With
the

aid
of

Hex

head
Extension
ST25570000

tighten
hex
head
slotted
bolt
1
3
to

1
8

kg
m
9
4

to
13
ft

Ib

2

Enter
dished

plate
driven

plate

drive

plate
and

retaining
plate
into

transmission

case
in

this
written
order

Install

snap
ring
to
secure

the
instal

lation

Note
The
number
of
drive
and
driven

plates
varies
with

types
of
vehi

cles
For

detailed
information

refer
to
Service
Data

Specifi

cations

AT
43
3

Without

disturbing
the
above

setting
check
to
be

sure
that
clearance

between

snap
ring
and

retaining
plate

is

held
within

specified
limits
If

nec

essary
try
with

other

plates
having

different
thickness
until
correct

clear

ance
is

obtained

Specified
clearance

O

SO
to
1

05
mm

0
031

to
0
041
in

4
Blow
under

pressure
air
into

oil

hole
in
low
reverse

brake
to

listen

for
definite
brake

operation
as
shown

in

Figure
AT
90

0j

L
J

1
1

I
1

I
Y

1
If

lY
v

A

we
1

a
II
I

7
r

AT158

Fig
AT
90

Testing
low
reverse

brake

Servo

piston

Disassembly

1
Blowout

piston
by
directing
a

jet

of
air
into

hole
in

release
side

of

piston

2
Remove

servo

piston
return

spring

Inspection

Check

piston
for
wear

damage
or

any
other
defects
which

might
inter

fere
with

proper
brake

operation

AT159

Fig
A
T
91
Removing
piston

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

AUTOMATIC
TRANSMISSIO
N

TROUBLE
DIAGNOSES
AND
ADJUSTMENT

INSPECTION
AND
ADJUSTMENT

BEFORE
TROUBLE
DIAGNOSIS

Testing
instrument
for

inspection

Checking
oil
level

Inspection
and

repair
of
oil

leakage

Checking
engine

idling
rpm

Checking
and

adjusting
kick
down
switch

and
downshift
solenoid

Inspection
and

adjustment
of
manual

linkage

Checking
and

adjusting
inhibitor
switch

STALL
TEST

Stall

test

procedures

Judgement

As
the
troubles
on

the
automatic

transmission
can
be

mostly
repaired
by

doing
simple
adjustment
so
do

not

disassemble

immediately
if
the

auto

m
tic
transmission
is
in
trouble

Firstly
inspect
and

adjust
the
auto

matic
transmission
with

mounting
on

vehicle

by
observing
the

trouble

shooting
chart

If
the

trouble
could
not
be

solved

by
this

procedure
then

remove
and

disassemble
the
automatic
transmis

sion
It

is
advisable
to
check

overhaul

and

repair
each

point
in
the

order

itemized
in

the
trouble

shooting

chart

l
In
the

trouble

shooting
chart

the

diagnosis
items

are

arranged
in
the

order
from

easy
to

difficult
and
there

fore

please
follow
these
items

The

transmission
should
not
be
removed

unless

necessary

2
The

test
and

adjustment
for
trou

ble

diagnosis
should
be
made

on
the

basis
of
standard
values
and
the
data

should
be
recorded
ROAD
TEST

Car

speed
at

gear
shift

Checking
speed

changing
condition

Checking
items

during
speed
change

Shift
schedule

LINE
PRESSURE
TEST

Line

pressure
governor
feed

pressure

Judgement
in

measuring
line

pressure

TROUBLE
SHOOTING
CHART

Inspecting
items

Trouble

shooting
chart
for
3N71
B
Automatic

Transmission

Trouble

shooting
guide
for
3N718
Automatic

Transmission
CONTENTS

AT
49

AT
49

AT
49

AT
50

AT
50

AT
50

AT
51

AT
51

AT
51

AT51

AT
52

INSPECTION
AND

AD
JUSTMENT

BEFORE

TROUBLE

DIAGNOSIS

Testing
instrument
for

inspection

1

Engine
tachometer

2
Vacuum

gauge

3
Oil

pressure
gauge

It

is
convenient
to

install
these

instruments
in
a

way
that
allows

meas

urements
to
be
made

from
the
driver
s

seat

Checking
oil

level

In

checking
the
automatic
transmis

sion
the
oil

level
and

the
condition
of

oil
around

the
oil
level

gauge
should
be

examined

every
5

000
km
3
000

miles
These

steps
are

easy
and

effec

live

in
trouble

shooting
as
some

change
of
oil
conditions
are

linked

with

developed
troubles
in

many
cases

AT
49
AT
52

AT
52

AT
53

AT
53

AT
53

AT
53

AT
53

AT
54

AT
54

AT
54

AT
55

AT
5B

For
instance

Lack

of
oil
causes
defective

opera

tion

by
making
the
clutches
and

brakes

slip
developing
severe

wear

The

cause
of

this

operation
is
that

the

oil

pump
has

begun
to

suck
air

which

caused
oil

foaming
thus

rapidly

deteriora

ting
the
oil

quality
and

pro

ducing
sludge
and

varnish

Meanwhile
excessive
oil
is
also
bad

as
in
the

case
of

a
lack

of
oil
because

of
oil

foaming
by
being
stirred

up
by

the

gears
Moreover
in

high
speed

driving
with
excessive
oil
in
the
trans

mission
the
oil

often
blows
out
from

the
breather

I

Measuring
oil
level

When

checking
the
fluid
level
start

the

engine
and
run
it
until
normal

operating
temperatures
oil

tempera

ture
50
to

800e
122
to
176
F

Approximately
ten
minute

operation

will
elevate
the

temperature
to
this

range
and

enigne
idling
conditions

are
stabilized
Then

apply
the
brakes

and
move
the
transmission

shift
lever

through
all
drive

positions
and

place

the
lever
in

park
P

position
In
this

inspection
the
car
must
be

placed
on
a

level
surface

The
amount
of
the
oil

varies
with

the

temperature
As
a
rule
the
oil

level

must
be

measured
after
its

tempera

ture
becomes

sufficiently
high

I
Fill
the
oil

to
the
line
H

The

difference
of

capacities
between
both

H

and
L

is

approximately
0
4

liter
7
8

U
S

pt
3
4

Imper

pt
and

therefore
take

care
not
to
fill

beyond

the

line
H

2
At
the
time
of
the

above

topping
up
and

changing
of
oil
care

should
be
taken
of
to

prevent
mixing

the
oil
with
dust
and

water

2

Inspecting
oil
condition

The
condition
of
oil

sticking
to
the

level

gauge
indicates
whether
to
over

haul
and

repair
the
transmission

or

look

for
the

defective

part

If
the

oil
has
deteriorated
into

a

varnish
like

quality
it

causes
the
con

trol
valve
to

stick
The
blackened
oil

gives
the

proof
of
the
burned
clutch

brake
band

etc
In

these
cases
the

transmission
must
be

replaced

Notes
a
In

oil
level

checking
use

special

paper
waste
to

handle

the
level

gauge
and
take

care

not
to
let
the

scraps
of

paper

and
cloth

tick
to
the

gauge

b
Insert

the

gauge
fully
and

take

it
out

quickly
before

splashing
oil
adheres
to
the

gauge
and
theu
observe
the

level

c

Use
automatic
transmission

fluid

having
DEXRON

iden

tIficatIon

only
in
the
3N71
B

automatic
transmission

d

Pay
atteutIon

because
the

oil
to

be
used
dIffers
from
that

i

used

in
the
Nissan
Full

Automatic

Transmission

3N7IA

Never
mix
the
oil
with

that
CHASSIS

Inspection
and

repair
of
oil

leakage

When
oil

leakage
takes

place
the

portion
near
the

leakage
is
covered

with
oil

presenting
difficulty
in
de

tecting
the

spot
Therefore
the

places

where
oil

seals
and

gaskets
are

equipped
are

enumerated
below

I
Converter

housing

The
rubber

ring
of

oil

pump
hous

ing

The
oil

eaI
of
oil

pump
housing

The
oil

seal
of

engine
crankshaft

The
bolts
of
converter

housing
to

case

2

Transmission
and
rear
extension

Junction
of
transmission
and
rear

extension

Oil
tube
connectors

Oil

pan

Oil

pressure
inspection
holes
Refer

to

Figure
AT

112

The

mounting
portion
of
vacuum

diaphragm
and

downshift
solenoid

Breather

and
oil

charging

pipe

Speedometer
pinion
sleeve

The
oil
seal

of
rear
extension

To

exactly
locate

the

place
of
oil

leakage
proceeds
as
follows

Place
the

vehicle
in
a

pit
and

by

sampling
the

leaked
oil
examine

whe

ther

it
is
the

torq
le
converter
oil
or

not

The

torque
converter
oil

assumes

color
like
red
wine

when

shipped

from
the

factory
so
it
is

ea

ily
distin

guished
from

engine
oil

or

gear
oil

Cleanly
wipe
off
the

leaking
oil
and

dust
and
detect

the

spot
of
oil

leakage

Use
nonflammable

organic
solvent

such
as
carbon

tetrachloride
for

wip

ing

Raise
the

oil

temperature
by

op

erating
the

engine
and

shift
the

lever

to
0
to

heighten
the

oil

pressure

The

spot
of
oil

leakage
will
then

be

found

more

easily

Note

A

the
oil

leakage
from
the

breather
does
not
take

place

except
when

running
at

high

speed
it
is

impossible
to
locate

the

spot
of

leakage
with
vehicle

stalled

AT
50
Checking
engine
idling

rprn

The

engine
idling
revolution
should

be

properly

adjusted

If
the

engine
revolution
is

too
low

the

engine
does
not

operate
smoothly

and
if

too

high
a

strong
shock
or

creep
develops
when

changing
over

from
N

to
D
or

R

Specified

idling
speed

650

rpm
at
D

position

800

rpm
at
N

position

Checking
and

adjusting
kick

down
switch
and

downshift

solenoid

When
the

kick
down

operation
is

not
made

properly
or

the

speed
chang

ing
point
is
too

high
check
the

kick

down
switch

downshift
solenoid
and

wiring
between
them

When
the

igni

tion

key
is

positioned
at
the

1st

stage

and
the

accelerator

pedal
is

depressed

deeply
the
switch
contact
should
be

closed
and
the

solenoid
should
click

If

it

does
not
click
it

indicates

a
defect

Then
check

each

part
with

the

testing

instruments

See

Figure
AT
I09

0
0

1
M

r

7

I

Y

ATl08

Fig
A
T
l

09

Downshift
solenoid

Note

Watch
for
oil

leakage
from

transmission
case

CHASSIS

SERVICE
DATA
AND
SPECIFICATIONS

General

specifications

Torque
converter

Type

Stall

torque
ratio

Transmission

Type

Control
elements

Gear
ratio

Selector

positions

Oil

pump

Type

Number
of

pump

Oil

Capacity

Hydraulic
control

system

Lubrication

system

Cooling
system
Multiple
disc
clutch

Band
brake

Multiple
disc
brake

One

way
clutch

1st

lnd

3rd

Reverse

P
Park

R
Reverse

N
Neutral

D
Drive

1
lnd
lock

I
Lock

up

AT
60
Symmetrical3
element
I

stage
l

phase
torque

converter

coupling

2

0
I

3

speed
forward
and
one

speed
reverse
with

planetary
gear
train

1

I

I

I

2

458

1
458

1
000

2
182

The
transmission
is

placed
in
neutral
The

output

shaft
is
fixed
The

engine
can
be
started

Backward

running

The
transmission
is
in

neutral
The

engine
can
be

started

Up
or
downshifts

automatically
to
and

from
1st

lnd
and

top

Fixed
at
2nd

Fixed
at
low

or
downshifts
from
2nd

Internally
intermeslting
involute

gear
pump

Automatic
transmission
fluid

Dexron

type

5

5
liters
57
8
U
S

qts
47
8

Imp
qts

Approximately
1
7
liters
27
8
U

S

qts
2

3
8

Imp
qts
in

torque
converter

Controlled

by

detecting
the

negative
pressure

of
intake
manifold
and
the
revolution

speed
of

output
shaft

Forced
lubrication

by
an
oil

pwnp

Air
cooled

BRAKE

TANDEM
MASTER
CYLINDER

The

tandem
master

cylinder
allows
either
front
or
rear

brake

displaying
sufficient

braking
effect

although
a

trouble
occurs
in
one
side
of
either

front
or

rear
brake

improving
driving
safety
The

tandem

type
master

cylinder
is
manufactured

by

NABCO
or
TOKlCO
When

disassembling
and

reassem

bling
be

careful
not
to
mix
the
individual
manufacturer
s

parts

t

I

Fig
BR
4
Cross
sectional

view

of
tandem

type

master

cylinder

Removal

L
Remove
the

clevis

pin
and

separale
the

brake

pedal

from
the
master

cylinder
push
rod

2
Disconnect
the
brake
tube
from
the

master
cylinder

3
Remove
the
master

cylinder
installation
bolt

remove

the

master

cylinder
shim

and
remove
the
master

cylinder

assembly
from
the

body

Disassembly

L

Drain
brake

fluid
and

remove
the

stopper
bolt

2

Remove
the
dust
cover

remove
the

snap
ring
and

stopper
ring
and
remove
the

push
rod

assembly

3

Take
out
the

piston
mechanism

components
in

order

of
the

primary
piston
assembly

secondary
piston
assem
bly
and

piston
spring

4
Remove
the
valve

cap
and

remove
the
valve
as

sembly

Note
Disassemble
the
master

cylinder
carefully
so
that

the

sliding
surface
of
the

piston
and

piston

cup
are

not

damaged
Do
not

remove
the
fluid
reservoir

unless

really
necessary
Moreover
do

not
remove

the

piston
cup
unless
the

piston
is

replaced

Inspection

Thoroughly
clean
all

disassembled

parts
check
for

wear

damage
and
other
defective

conditions
and

replace

if

necessary

Note
Do
not
clean
rubber

parts
with
mineral
oil
since

they
are
deteriorated
Use
brake

fluid
or
alcohol

When
aloohol
is
used
however
do

not
immerse

BR
3