1973 DATSUN B110 brakes

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

CHASSIS

DESCRIPTION

The
Datsun
1200

series
new
models

adopt
a

hydraulic

brake

Dis
brake
or
two

leading
shoe

type
drum
brake
is

used
for
the
front

wheels
and

leading
trailing
shoe

type

drum
brake
is
used
for
the

rear
wheels

With

adoption
of
the

disc
brake

safety
at

high
speed

range
driving
is
further

improved

For
the

master

cylinder
either

single
type
or
tandem

type
is
used

There
are
two

types
of
tandem

type
master

cylinder
one
is
for
disc

brake
and
the
other
for
drum

brake
Under
the

standard

specifications
h0wever
the

tandem

type
master

cylinder
is

used
for
disc
brake
and

single
type
is
used
for
drum

brake

The
tandem

master

cylinder
provides
a
dual

brake

system
improving
safety

The
hand
brake
is
of

a
mechanical

type
which
brakes

the
rear

wheels

through
the
control
lever

and
steel
wire

The

control
lever
is
located
between
the
driver
and

assistant
seats
and
can
be

operated
easily

BRAKE
PEDAL

The

steering
colunm
bracket

supports
the
brake

pedaL

The
brake

pedal
is
instaUed
on
the

steering
column

bracket
with
a
fulcrum

pin
The
brake

pedal
arm
and

brake
master
cylinder

push
rod
are

joined
with
a

clevis

pin
The

stop
lamp
switch

opposes
the
brake

pedal
arm

bracket
and

operates
as

the

pedal
arm
moves

t

2

3
Stop
lamp
switch

Brake

pedal
stopper

Brake

pedal
arm
4
Clevis

pin

5
Push
rod

6
Fulcrum

pin

Fig
BR
2
Brake

pedal
installation
Removal

Unhook
the
rerum

spring

Remove
the

spring
pin
from
the
clevis

pin
which
is

used
to
connect
the
master

cylinder
push
rod
to

the
brake

pedal
arm
remove
the

clevis

pin
and

separate
the

push

rod
from
the

pedal
arm

3
Remove
the

fulcrum

pin
which
is
used

to
connect
the

pedal
arm
to
the

bracket
and

separate
the

pedal
arm
from

the
bracket

@

mm
l6
qf

@

@

t

Spring
pin
5
Nut
9
Return

spring

2

Clevis

pin
6

Spring
washer
10
Brake

pedal
arm

3
Washer
7
Nut
It
Brake

master

4

Spring
lasher
8

Fulcrum
shaft

cylinder

Fig
BR
3
Brake

pedal
components

tandem

type
master

cylinder

Inspection

1

Check
sliding
parts
for
wear
and
the

return

spring
for

weakness

2
Check
the
brake

pedal
for
bending

warping
and

crack

3

Check
other

parts
for
serviceabilities

Reinstallation

Reinstall
the
brake

pedal
in
reverse

sequence
of

removal

noting
the
following
matters

1
Grease

sliding

parts
and
retum

spring
hook
with

multipurpose
grease
MIL

G
2108
or
G
10924

2

Tighten
the
fulcrum

pin
installation
nut
to
2

1
to

2
9

kg
m

15
2
to
21
0
ft
lb

BR
2

Tightening
torque

3

way
connector
1
5

to
1
8

kg
m

10
8
to
13
0
ft
lh

1
5
to
1
8

kg
m

10

8
to
13

0
ft

lh

1
5
to
1
8

kg
m

10

8
to
13

0
ft

lb

0

7
to
0
9

kg
m

5
1
to
6
5

ft
1b
Master

cylinder

Brake
hose

Air
bleeder

5

Fill
the

master

cylinder
brake

fluid
reservoir
with

brake
fluid
and

perform
air

bleeding
complele1y

Note
a
Do
not
use

brake
fluid
other
than

specified

b
The

specified
brake
fluid
is
used
for

both

single

and
tandem

type
master

cylinders

6

Upon

completion
of
air

bleeding
make

sure
that
the

brake

operates
correctly
and
check
the
brake
tube
and

hose
connectors
for
fluid

leaking
Fully
depress
the

brake

pedal
continue
to

depress
the
brake

pedal
for
several

seconds
and
make
sure
that
no
brake

fluid
leaks
from

any

part
of
the
brake
line

Replace
defective

part
if

required

Brake
line

pressure
differential

warning

light
switch

A

warning
light
is

located
on
the
instrument

panel
to

warn
the
driver
when

a

pressure
difference
of
13

to
17

kg
cm2
185
to

2421bJsq
in
exists
between
the

front
and

rear
b
rake

systems

A

hydraulically
actuated

warning
light
switch

is
located

in

the

engine
compartment
Both
front
and
rear
brake

systems
are
connected
to
this
switch
assembly

When

a

pressure
difference
of
13

to
17

kgJcm2
185
to

242

lbJsq
in
occurs
between
the
front
and
rear

brake

systems
the
valves

will
shuttle
toward
the
side
with
the

low

pressure
The
valve
contacts
with
the
switch
terminal
BRAKE

the

ground
circuit

for
the

warning
light
is

completed
and

thus
the

warning
light
lights

In
this

case
correct
the

hydraulic
brake

problem
and

bleed
the
brakes

Check
the

warning
light
switch

assembly
for
a

proper

operation
Check
the
switch

assembly
for
fluid

leakage

Note
Do

not

attempt
to

repair
switch
for

any
reason

replace
switch

assembly
completely

1
To
front
brake

L
H

2

From
master

cylinder
F

3
From
master

cylinder
R
4
To
rear
brake
L
B
R
M

5
To
front
brake
R
H

Fig
BR
12

Warning
light
switch

r

I

@

I
I
3

I
Valve

assembly

4

Piston
load

spring
Wire
terminal

Brake
tube

Fig
BR
13
Sectional

view

of

warning
light
switch

BR
7

Pedal

yields
under

slight

pressure

Excessive

pedal

travel

All

brakes

drag

One
brake

drags

Unbalanced
brakes
BRAKE

Use
of
a
brake
fluid
with

a

boiling
point

which
is
too
low

Reservoir

filler

cap
ven
t
hole

clogged
This

promotes
a
vacuum
in
master

cylinder
that

sucks
in
air

through
rear
seal

Deteriorated
check
valve

External

leaks

Master

cylinder
leaks

through
primary
cap

System
has

not
been
bled

Improperly
adjusted
clearance

Fluid
level
in

master

cylinder
is
too
low

Thermal

expansion
of
drums
due
to

over

heating

Insufficient
shoe
tlrdrum

clearance

Weak
shoe

return

springs

Brake
shoe

return
no
free

travel

Seized
master

cylinder
piston

Loose
or

damaged
wheel

bearings

Weak
broken
or

unhooked
brake

shoe

return

springs

Insufficient
clearance
between
brake
shoe

and
drum

Grease
or
oil
on

linings

Seized

piston
in
wheel

cylinder

Tires

improperly
inflated

Loose
wheel

bearing

BR
25
Change
with
the

specified
brake

fluid
and

bleed

system

Clean
reservoir
filler

cap
and
bleed
the

system

Fit
a

new
check

valve
and
bleed
the

system

Check
master

cylinder
piping
and

wheel

cylinder
for
leaks
and
make

necessary
re

pairs

Overhaul
master

cylinder

Bleed

the

system

Adjust
shoe

to
drum

clearance

Full

up
with

specified
brake

fluid

Bleed
the

system
if

required

Allow
drums

to
cool
off
Check
brake

shoe

linings
and
drums

Replace
damaged

parts

Adjust
clearance

Replace
the

springs

Adjust
pedal
height

Service
the

master

cylinder
replace
the

piston
and
bleed

the

system

Adjust
or

replace
wheel

bearings

Replace
spring

Adjust
brakes

Clean
brake
mechanism

replace
lining
and

correct
cause
of

grease
or

oil

getting
on

lining

Service
the
wheel

cylinder
and

bleed
the

system

Inflate
tires

to
correct

pressure

Adjust
wheel

bearing

CHASSIS

Front

suspension
faulty

Thoroughly
check
and

adjust
all

front
sus

pension
components

Excessive

pedal

pressure
required

poor
brakes
Grease
mud
or
water
on

linings
Remove
drums

Clean
and

dry
linings
or

replace

Full
area
of

linings
not

contacting
drums

Replace
shoes

Scored
brake

drums
Reface

drums
and
install
new

linings

Brake

chatter

squeak
or

squeal
Dust

on
drums
or
oil

soiled

linings
Remove

and
clean
drums

thoroughly

Eliminate
oil

leak

Weak
shoe
return

springs
Check

springs
and

replace
as

required

Drum
out

of
round
Turn
drums

on
lathe

Worn

linings
Replace
linings

SERVICE
JOURNAL

OR
BULLETIN

REFERENCE

DATE
JOURNAL

or

BULLETIN
No
PAGE
No

SUBJECT

BR

26

CHASSIS

TROUBLE

DIAGNOSES
AND

CORRECTIONS

Condition

Heavy
steering

Loose

steering

PuU
to
one

side

Steering
shock
Probable
cause

Low
tire

pressure

Incorrect

front
wheel

alignment

Lack
of

lubricant

Firm

sticking
of

the
ball

joint
and
strut

bearing

Improper
adjustment
and

damage
of

steering

gear
housing

Hard

locking
of

column

bearing

Incorrect
front

wheel

bearing
adjustment

Loose

steering
linkage
connections

Loose

steering
gear
housing

mounting

Incorrect

adjustment
of

adjust
nut

Incorrect
tire

pressure

Incorrect
front
wheel

alignment

Incorrect

front
wheel

bearing
adjustment

Unequal
brake

adjustment

Weak
front

suspension
units

Deformation
or

improper
fitting
of
sus

pension

Incorrect
front
wheel

alignment

Loose
front
wheel

bearings

Loose

steering
linkage
connection
and

trans

verse
link

Incorrect

adjustment
of

ball
nut

Wheels

out
of

balance

ST
18
Corrective

action

Inflate

tires
to

recommended

pressure

Adjust
to

specifications

Lubricate

steering
gear
and
ball

joints
or

replace
worn
ball

joint

Replace

Adjust
or

replace
according
to
instructions

Lubricate
with

bearing

grease

Adjust
or

replace
as

required

Inspect
replace
worn

parts
if

any
and

tighten
nuts
to
recommended

torque

Tighten
mounting
bolts

to

proper
torque

Adjust
according
to

instructions

Inflate
to
recommended

pressure

Inspect
and

correct
front
wheel

alignment

Adjust
bearings
according
to

instructions

Adjust
brakes

Replace

Check
correct
or

replace

Inspect
and
correct
front
wheel

alignment

Adjust
bearings

Inspect
replace
worn

parts
if

any
and

tighten
nuts
to

proper
torque

Adjust
steering
gear
according
to

in

structions

Inspect
and
correct
wheel

balance