torque DATSUN B110 1973 Service Owner's Manual

Low
and

reverse
brake

clearance
0
8
to
1

05
mm

0
031
to

0
041
in

Fig
AT

70

Measuring
ring
to

plate

clearanc

Available

retaining
plate

No

Thickness
mm
in

I

15
8
0

622

2
16
0

0
630

3
16
2
0

638

4
16
4
0
646

5
16
6
0

654

6
16
8

0

661

As

to

inspection

procedure
for
low

and
reverse
brake
see

page
AT
43

3

Install
one

way
clutch

so
that
the

arrow

mark
is

toward
front

of

vehicle
It

should
be

free
to

rotate

only
in

clockwise
direction
See

Figure

AT71

AT131

Fig
AT
71
One

way
clutch

4

After

installing
rear

extension

torque
attaching
bolts
to
2

0
to
2
5

kg
m
14
to

18
ft
lb
Place
manual

lever
in
P

range
and
check
to

be
sure

that

rear

output
shaft
is

securely

blocked

5

Tighten
servo
retainer

temporari

Iy
at

this

stage
of

assembly
CHASSIS

6
Place
rear

clutch

assembly
with

needle

bearing
on
front

assembly

7

Install
rear

clutch
hub
and

front

planetary
carrier
in
the
manner
as

shown
in

Figure
AT
72

AT142

Fig
AT

72

Installing
planetary
carrier

8

Assemble

connecting
shell

and

other

parts

up
to
front
clutch
in

reve
e
order
of

disassembly

ATl43

Fig
AT
73
In

talling
connecting
hell

9

Adjust
total
end

play
and
front

end

playas
follows

L

@
8

S

I
fT

15

l

r

1
Front
clutch

thrust

washer

2
Oil

pump

3
Front
clutch

4

Rear
du
tch
S
Transmission
case

6
Oil

pump

gasket

7

Oil

pump
cover

bearing
race

Fig
AT
74

Endplay

AT
40
I
Measure
the
distance
A

and

e

by
vernier

calipers
as
shown
in

Figure
AT
75

fl
l

I
Transmission
case

1l

Lf
ar
n
h

AT139

Fig
AT
75

Measuring
the
diltance

A
and

C

2
Measure
the
distance

B

and

D

of
oil

pump
COVer
as
shown
in

Figure
AT
76

B

AT140

Fig
AT
76

MeaJIuring
the
diltanc

B
and
D

Adjustment
of
total

end

play

Select
oil

pump
cover

bearing
race

by

calculating
the

following
formula

TT
A
B
W

where

TT
Required
thickness
of
oil

pump

cover
bearing
race
mm
in

A

Measured
distance
A

mm
in

B
Measured
distance
B
mm
in

W

Thickness
of

bearing
race
tem

porarily
inserted
mm

in

Available
oil

pump
cover

bearing
race

No
Thickness

mm
in

I
1
2

0
04
7

2
I

4
0
055

3
1

6
0
063

4
1

8
0
071

5

2
0
0
079

6
2
2

0
087

Specified
total
end

play

0

25
to

0
50
mm

0
009
to
0

020
in

Adjustment
of
front
end

play

Select
front
clutch
thrust
washer

by

calculating
the

following
formula

TF
C
D
0
2
mm

where

T

F
Required
thickness
of
front

clutch
thrust

washer
mm

in

C
Measured
distance
C
mm
in

D
Measured
distance
D

mm
in

Available
front
clutch
thrust
washer

No
Thickness

mm
in

I
J
5
0
059

2
1
7
0
067

3
1
9

0
075

4
2
1

0
083

5
2
3

0
091

6
2
5
0
098

7
2
7
0

106

Specified
front
end

play

0
5

to
0
8
mm

0
020
to
0
031
in

Notes
a
Correct

thickness
of

bearing

race
and
thrust
washer
is
al

ways
the
one
which
is
nearest

the
calculated

one

b
Installed
thickness
of

oil

pump
gasket
is

0
4
mm
0
016

in

10

Check
to
be

sure
that

brake

servo

piston
moves

freely
For
detailed

procedure
refer
to

covering

topic
on

page
AT
43

Use

care
to

prevent
piston

from

coming
out
of

place

during
test

ing
since

servo
retainer

is
not

tightened

at
this

point
of

assembly

II

Make
sure
that
brake
band

strut

is

correctly
installed

Torque
piston

stem
to
1
2

to
1
5

kg
m
8
7

to
II

ft
lb
Back
off
two
full

turns
and

secure

with
lock
nut
Lock
nut

tight

ening

torque
is
1
5

to
4

0

kg
m

I
I
to

29
ft

Ib
AUTOMATIC
TRANSMISSION

I
2

After
inhibitor
switch
is
in

stalled
check
to
be
sure
that
it

op

erates

properly
in
each

range
For

detailed

procedure
refer
to

covering

topic
on

page
AT
51

13

Check
the

length
L
between

case
end

to
rod
end

of
vacuum

throttle

valve

fully
pushed
in

Then
select

adequate
diaphragm
rod

corresponding

measured

length
See

Figure
AT
77
m
rj

I

L

1

AT145

i

Fig
AT
77

Measuring
the
distance

L

Available

diaphragm
rod

Distance
measured

L
mm

in

Under
25
55

1
006

25
65

to
26
05
1

010
to
1

026

26
15
to
26
55
1

030
to
1

045

26
65
to
27
05
1

049
to
1
065

Over
27
15
1

069

COMPONENT
PARTS

The

transmission
consists
of

many

small

parts
that
are

quite
alike
in

construction

yet
machined
to

very

close
tolerances
When

disassembling

parts
be
sure
to

place
them
in

order
in

a

part
rack
so

they
can
be
restored
in

the
unit
in
their

proper
positions
It
is

also

very
important
to

perform
func

tional
test
whenever
it
is

designated

Front

clutch

Disassembly

Front

clutch

drum

Piston

1

AT146

1
Snap
ring
S
Dished

plate

2
Retaining
plate
6

Snap
ring

3
Drive
plate
7

Spring
retainer

4

Driven

plate
8
Coil

spring

Fig
AT
78
S
ctional
v
w

of

front
clutch

AT
41
Diaphragm
rod

length
mm
in

29
0

1
142

29
5
1
161

30
0
1
181

30
5
1
2
1I

31
0
1
220

I

Pry
off

snap

ring
D
with
a

suitable
screwdriver
or
a

pair
of

pliers

Remove
a

retaining
plate
@
drive

plate
@
driven

plate
@and
dish

plate

@
in
the
order

listed
as
shown
in

Figure
AT
78

2

Compress
clutch

springs
using

Clutch

Spring
Compressor

ST25420000
or
ST2542001
Re

move

snap
ring
@
from

spring
re

tainer

using
Snap
Ring
Remover

ST25320001
See

Figure
AT
79

Note

When
Clutch

Spring
Compres

sor
STIS420000
is

to
be
used

cut
the
toe

tips
of

threeloigs
by

a

grinding
wheel
See

Figure

AT
80

AT
1

Fig
AT
79
RemoL

ing
snap
ring

Clearance

between
seal

ring
and

ring

groove
See

Figure
AT

97

Standard

clearance

0

04toO
16mm

0

0016

to
0

0063
in

AT162

Fig
A

T
96

Measuring
clearance

I
earance

I
Seal

rIng

0d

t
AT185

II

Fig
AT
97

Measuring
clearance

Assembly

1
Set

up
pump

housing
and
inner

and
outer

pump
gears
on
it

2

With
the
aid

of
Oil

Pump
Assem

bling

Gauge
ST255800oo
install

pump
cover
to

pump
housing
as
shown

in

Figure
AT

98

lnnrr
i

rnl

l

AT166

Fig
A
T
98

Centering
oil

pump

3

Temporarily
tighten

pump
secur

ing
bolts

4

Set
the
runout

of
oil

pump
cover

within
0

07
mm

0
0028
in

total

indicator

reading
See

Figure
A
T

99
AUTOMATIC
TRANSMISSION

AT264

Fig
A
T
99

Measuring
run

out

5

Tighten
pump
securing
bolts
to

specified
torque
0
6
to
0
8

kg
m
4
3

to
5
8
ft

Ib

Note
Be
sure

to

align
converter

housing
securing
bolt
holes

6

Again
check
the
runout
of
oil

pump
cover

Note

When
former
Oil

Pump
As

sembling
Gauge
is
to
be
used

make
a
screw
hole
in

side
of
it

Planetary
carrier

The

planetary
carrier
cannot
be

divided
into
its

individual

components

If

any
part
or

component
is
defec

tive

replace
the
carrier
as
a
unit

Inpsection

Check
with
a
feeler
clearance
be

tween

pinion
washer
and

planetary

carrier

See

Figure
AT
100

Standard
clearance

0
20
to
0
70

mm

0
008
to
0

028
in

Clearance

I

LJ
b

II
I

AT161

Fig
AT
100
Mea

uring
pinion
washer

to

carrier
clearance

AT
45
Replace
if

going
over
0
80
mm

0
031

in

Control
valve

The
control
valve

assembly
consists

of

many
precision
parts
and

requires

extreme

care
when
it

has
to
be
re

moved
and

serviced
It
is

good
practice

to

place
parts
in
a

part
rack

so
that

they
can

be
restored
in

valve

body
in

their

proper
positions
Added
care

should
also
be
exercised
to

prevent

springs
and
other

small

parts
from

being
scattered
and
lost

Before

assembly

dip
all

parts
in

clean
automatic
transmission
nuid
and

check
to
be
certain

that

they
are
free

of
lint

and
other
minute

particles
If

clutch
or

band
is
burnt

or
if

oil

becomes
fouled
the

control
valve
as

sembly
should
be

disassembled
and

flushed

Disassembly

1
Remove

bolts
and
nuts
which

retain
oil
strainer
Bolts

may
be

re

moved
with
a
screwdriver
but
it
is

recommended
to
use

Hexagon
Wrench

HT61000800
and

Spinner
Handle

HT62350000

See

Figure
AT
10
I

2
Remove

attaching
bolts
With

bolts
removed

lower
valve

body

separate
plate
and

upper
valve

body

are
free
for
removal

See

Figure

AT
102

Note
Do

not
allow
orifice

check

valve
and
valve

spring
in
lower

valve

body
from

being
scattered

and
lost

when

removing
sepa

rate

plate

HT61000BOO

HT62350000

Fig
AT
101

Removing
valve

body

AUTOMATIC
TRANSMISSIO
N

Valve

pring
chart

Installed

Wiredia
Mean
coil

No
of
Free

length

Valve
spring

mm
in
dia

active
coil

mm
in
Length
Load

mm
in

mm
in

kg
Ib

1
3
6
0

15
0
32
4

26
5
5
5

Manual
detent

0
0512
0
2362
1

276
1

043

12

1
2
10
5

13
0
43
0

23
5
2
8

Pressure

regulator

0
0472
0
4134
1
693
0

925
6
2

0
4

8
0
5
0
18
5
9
0
0
1

Pressure
modifier

0
0157
0
3150

0
728
0
3543
0
2

0
6
6
0

16
0
32
0
16
0
0
625
it
J

1st
2nd
shift

0
0236
0
2362
1

260
0

630
14
i

o

0
7
6
2
18

0
41
0
17
0
140

2nd
3
rd
shift

0
0276
0
2441
1

614
0
669
3
1

0
7
5
5
15

0
32
5
27
0
0
55

2nd
3rd

timing

0
0276
0
2165
1

280
1
063
1
2

Throttle
back

up
0

8
6
5
14

0
36
0
18

8
1
92

0

0315
0
2559
1417
0
740
4
2

0

55
5
0
12
0
22
0

12
5
0
60

Solenoid
downshift

0
0217

0
1969
0
866
0
492

1
3

0
55
5
0
16
0

33
5
21
0
0
60

Second
lock

0
0217
0
1969
1
319

0
827
1
3

0
9
5

6
14
0
26
8
19
0
2
19

Throttle
relief

0
0354
0
2205
1
055
0

748
4

8

0
2
4

8
15
0

21
5
11
5
0

01

Orifice
check

0
0078
0
1890
0
846

0
453
0
02

0
45
8
3
5
0
21
8
7
5
0

215

Primary

governor

0
0177
0
3268
0
858
0

2953
0
5

0
7
8
5
5
5
25
1
10
5
1
10

Secondary

governor

0

0276
0
3346
0
988
0
413
2
4

Free

length

L

U
d
As
ins
alled

I
t

LldnstjH
e

t
n
Ion

J
I
I
Assembly

Assembly
is

reverse
order
of

disas

sembly
However
observe
the
follow

ing
assembly
notes
Refer
to

Valve

Spring
Chart
and

illustration
in

as

sembling
valve

springs

Dip
all

parts
in

clean
automatic

transmission

fluid

before

assembly

Tighten
parts
to

specifications
whenever

designated
AT172

Fig
AT

106
Value

pring

AT
47
I

Slide
valve
into

valve

body
and
be

particularly
careful
that

they
are

not

forced
in

any
way

2
Install
side

plates

using
Torque

Driver
ST25I60000

See

Figure
AT

107

Tightening
torque

0
25
to
0
35

kg
m

1
9
to
2
5
ft
Ib

ST25
1

60000

HT6
1

000800

r

if
AT173

Fig
AT
107

Installing
side

plate

3

Install
orifice
check
valve

valve

spring
throttle
relief

valve

spring
and

steel
ball
in
valve

body
CHASSIS

Note

Install

check
valve

and
relief

spring
so
that

they
are

properly

positioned
in

valve

body

4
I

nstall

upper
and
lower
valves

See

Figure
AT

108

Tightening

torque

0
25
to
0
35

kg
m

1
8
to
2
5
ft
Ib

Reamer
bolt

tightening

torque

0
5
to
0
7

kg
m

3
6
to
5
1

ft
Ib

AT
48
A

t

ST25160000

HT61ooo800

AT174

Fig
AT
lOB

Installingualve

body

5

Install
oil
strainer

Tightening
torque

0
25

to
0
35

kg
m

1
8
to
2
5

ft
Ib

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

c

Inspection
and

adJu
Stmenf
trouble
first
check

the

linhge
f
no

1
i

jI
fect

is
found
in
the
lin1

age
check

of

manu
a
l

liiiJ
i

the
inhibitor
switch

Th

d
1F

aI
S
t
th
I
I
f
e

a

JU
i

J
u

epara
e
e

range
se
eet

ever
rom

Iy

important
ii
s3

ns
etion
of
oil
the
lower
shift

rod
and
turn
the

range

1

level
for
the
automatiC

tran
smission
select
lever
to
N

Therefore

great
care
should

be
exer

Note

In
the

position
N

the
slot
of

cised
because
defective

adjustment
will

the
manual
shaft
is

vertical

result
in

the
breakdown
of
the

trans

By
the
use
of
the
tester
check

the

two
bIack

yellow
BY
wires

from
the

inhibitor
switch
in
the

ranges
N

and

P

and
the

two
red
bIack

RB
wires

in
the

range
R
for

continuity
Turn

range
select
lever
to
both

directions

from
each
lever
set

position
and
check

each

continuity

range
It
is

normal
if

the

electricity
is
on
while
the

lever
is

within

an

angle
of

about
3
0

on

both

sides
from
each

lever
set
line
How

ever
if
its

continuity
range
is
obvi

ously
unequal
on
both

sides
the

adjustment
is

required

f

any
malfunction
is

found
un

screw
the

fastening
nut
of
the

range

selector
lever

and
two

fastening
bolts

of

the
switch

body
and
then
remove

the
machine
screw

under
the
switch

body
Adjust
the
manual
shaft
correct

ly
to
the

position
N

by
means
of

the
selector
lever

When
the
slot
of

the
shaft

becomes
vertical
the
detent

works
to

position
the
shaft

correctly

with

a
click
sound

Move
the

switch

slightly
aside
so

that
the
screw
hole
will
be

aligned

with
the

pin
hole
of
the
internal
rotor

combined
with
the

manual
shaft
and

check
their

alignment
by
inserting
a

1
5

0101
0
0591
in
diameter

pin
into

the
holes
If

the

alignment
is

made

correct
1
5ten
the
switch

body
with

the

bolts

pull
out
the

pin
and

tighten

up
the
screw

again
into
the
hole
and

fasten
the
selector
lever
as
before

Check
over

again
the

continuity
with

the

tester
If
the
malfunction
still

remains

replace
the
inhibitor
switch
mission

Inspection

Pull
the
selector
lever

toward

you

and
turn
it

so
far
as
p

to
1

range

where
clicks
will
be
felt

by
hand
This

is

the
detent
of
manual
valve
in
the

body
and
indicates
the
correct

posi

tion

of
the

lever

Inspect
whether
the

pointer
of

selector
dial

corresponds
to
this

point

and
also
whether
the
lever

comes
in

alignment
with
the

stepping
of

posi

tion

plate
when
it
is

released

Adjustment

This

procedure
can

be
accom

plished
by
referring
to
Removal
and

nstallation

Checking
and

adjusting

inhibitor
switch

The
inhibitor
switch
serves

to
light

the

reverse

lamp
in
the

range
R
of

the
transmission

operation
and
also
to

rotate
the

starter
motor
in
the

ranges

N
and
P

j

r@
I

If

r
f
B

@
I

Jt
@
@

c
v@

i

r
fji

AT109

1
Inhibitor

switch

2
Manual

shaft

3
Washer

4

Nut

5

Manual

plate

Fig
AT
II
0
Con
truction

of
inhibitor

witch
6
Washer

7

Nut

8
Inhibitor
switch

9

Range
select
lever

Check
whether
the

reverse
lamp

and
the
starter
motor

operate
normal

ly
in

these

ranges
If
there
is

any
t

ki

A

mm
ATIC
TRANSMISSION

STALL
TEST

The

purpose
of
this
test
is
to
check

the
transmission

and

engine
for

trou

ble

by
measuring
the
maximwn

num

bers
of
revolutions
of
the

engine
while

vehicle
is
held
in
a
stalled
condition

and
the
carburetor
is
in
full

throttle

operation
with

the
selector
lever
in

AT
51
rang
s
D
2

and
I

respectively

and

by
com

pairing
the
measured

re

sults

with
the

standard
values

Standard
stall
revolution

1
750
to
2
000

rpm

Components
to
be
tested
and
test
items

1

Clutches
brake

and
band

in

trans

mission

for

slipping

2

Torque
converter

for
function

3

Engine
for
overall

property

Stall
test

procedures

Before

testing
check
the

enigne
oil

and

torque
converter
oil

warm

up
the

engine

cooling
water
to
the

suitable

temperature
by

warming
up

ope
ration

at

1
200

rpm
with
the

selector
lever
in

the

range
P

for
several
minutes

and

warm

up
the

torque
converter
oil

to

the

suitable

temperature
60
to
IOOoC

140
to
2120F

1
Mount
the

engine
tachometer
at
a

location
that
allows

good
visibility

from

the
driver

s
seat
and

put
a
mark

on

specified
revolutions

on
the
meter

2
Secure
the

front
and
rear
wheels

completely
with
chocks
and

apply
the

hand
brake
Be

sure
to

depress
the

brake

pedal
firmly
with
the
left
foot

before

depressing
down
the
accelerator

pedal

3
Throw
the

selector
lever
into
the

range
D

4

Slowly
depress
the

accelerator

pedal
down
till
the

throttle
valve
is

fully
opened
Quickly
read
and
record

the

engine
revolution
when
the

engine

begins
to
rotate

steadily
and

then

release
the
accelerator

pedal

5
Turn
the

selector
lever
into
N

and

operate
the

enigne
at

approxi

mately
1

200

rpm
for
more
than
one

minute

to
cool
down
the

torque
con

verter
oil
and
coolant

6
Make
similar
stall
tests
in
the

ranges
2
I

and
R

Note

The
stall
test

operation
as

spec

ified
in

the
item
4
should
be

made
within
five
seconds
If
it

takes
too

long
the
oil
deterio

rates
and
the

clutches
brake

and
band
are

adversely
af

fected
Sufficient

cooling
time

should
be

given
between
each

test
for
the
four

ranges
0

2
I

and
R

Judgement

I

High
stall
revolution

more
than

standard
revolution

If
the

engine
revolution
in
staU

condition
is

higher
than
the
standard

values
it
indicates
that
one
or
more

clutches
in
the

transmission
are

slip

ping
and
therefore
nO
further
test
is

required

For
the

following
abnormalities

the
respective
causes
3re

presumed

High
rpm
in

all

ranges
Low
line

pre
ure

High
rpm
in
D
2
and
I
and

normal

rpm
in
R
Rear
clutch

slipping

High

pm
in
D
and
2

and

normal

rpm
in
lOne

way

clutch

slipping

High

rpm
in
R

only
Front

clutch
or
low
and
reverse
brake

slipping

To
determine
which
is

slipping

either
front
clutch
or
low
and
reverse

brake
a

road
test
is

needed

If

while

coasting
after

starting
with

the
lever
in
I

range
engine
braking

does
not
work

properly
it
is
deter

mined
the
low
and
reverse
brake
is

slipping
Otherwise
the
front
clutch
is

slipping

The

slipping
of
the
band
brake
is

difficult
to
ascertain
However
if
it

occurs
with
the
lever
in

2

range
the

enigne
revolution
increases

up
to
the

same
level

as
in
1st

speed
and

therefore
it
can
be

found
out

by

careful
observation
It
is

impossible
to

check
it
in
the
stall
test

Z
Standard
stall
revolution

If
the

enigne
revolution
in
stall

condition
is
within
the
standard

values
the
control
elements
are
nor

mally
operating
in

the

ranges
0

2
I

and
R

Also
the

engine
and
one

way

clutch
of
the

torque
converter
are

normal
in

perfonnance
and

operation

The
one

way
clutch
of
the

torque
Gear
shift

Propeller
shaft

rpm

D
D
1
840
to

2
340

D

DJ
3

340
to
3

840

DJ
D
3
460
to

2
960

D
0
1

790
to
1
290

D
D
330
to
830

D

OJ
l
720
to
2
220

DJ
D2
or

1
350
to
850

DJ
D

D
0
700
Max

I
I
1
860
to
1
360
CHASSIS

converter
however
sometimes
sticks

This
should
be
determined
in
the

road

test

3

Low
stall
revolution
less
than

standard
revolution

If
the

engine
revolution
in

stall

condition
is

lower
than
the
standard

values
it
indicates
that

the
engine
is
in

abnormal
condition
or
the

torque
con

verter
s

one

way
clutch
is

slipping

4

Other

I
If

the

accelerating
performance

is

poor
until
vehicle

speed
of

approxi

mately
50
km

h
30
MPH
is
attained

and
then
normal

beyond
that

speed
it

can
be

judged
that
the

torque
con

verter
s

one

way
dutch
is

slipping

2
If
the

torque
converter
s
one

way
clutch
sticks
vehicle

speed
can

not

exceed

approximately
80
km
h

Car

speed
at

gear
shift

Throttle

opening

mmHg

Kick
down

0

Half
throttle

200

Full
throttle

0

Minimum

throttle

450
I
50
MPH
in
the

road
test
In
such

a

case
the

torque
converter
oH

tempera

ture
rises

up
abnormally
and
s
o
s

pecial

care
is

required

13
If
the
transmission
does
not

operate

properly
in
all

vehicle

speeds

it

indicates

poor
engine
perfonnance

ROAD
TEST

An
accurate

knowledge
of
the
auto

matic
transmission
is

prerequisite
to
its

exact

diagnosis
by
a

road
test

It
is
recommended
to

prepare
a

diagnosis
guide
chart
in
which

are

written
the
standard
vehicle

speeds
for

each

stage
of
the

up
and
down

shiftings
Measured
vehicle

speeds
are

to
be
filled
in
the

adjoining
column
in

each

testing

Also
it
is

advisable
to
mount
a

stopper
for

positioning
the
throttle

opening

I
I
1

860
to
1
360

I
Reduce
the

speed
by
shifting
to

range
from
D

range

output
shaft
2

000

rpm

Note
Car

speed
can
be
calculated

by
the

following
fonnula

2
x
7r
x
r
x

Npx
60

v

RF
X
1

000

where
V
Car

speed
km
h

Np
Propeller
shaft
revolution

rpm

RF
Final

gear
ratio

r
Tire

effective
radius
m

11
The
ratio
of
circumference
of

a
circle
to
its
diameter
3
14

AT
52

Judgement
in

measurmg

line

pressure

I
Low

idling
line

pressures
in
the

ranges
D
2
loR

and
P

It
can

be
artributed
to
trouble
in

the

pressure
supply
system
or
too
low

output
of

power
caused

by

1
A

worn
oil

pump

2

An
oil

pressure
leakage
in
the
oil

pump
valve

body
or

case

3
A

sticking
regulator
valve

2
Low

idling
line

pressures
in

cer

tain

ranges
only

It

is
caused

pressumabIy
by
an
oil

leakage
in

the
devices
or
circuits
con

nected
to
the

relevant

ranges

1
When
there
is
an
oil

leakage
in

the

rear
clutch
and

governor
the
line

pressures
in
D

2
and
I
are

low

but
the

pressure
is

normal
in

R

2

When

an
oil

leakage
occurs
in

the

low

and
reverse
brake
circuit

the

line

pressures
in

R
and
p

are
low

but
the

pressure
is

normal
in
0

2

and
I

3

High
idling
line

pressures

It

is

presumed
to
be

caused

by
an

increased
vacuum
throttle

pressure

owing
to
a

leakage
in
the

vacuum
tube

or

diaphragm
or

by
an
increased
line

pressure
due
to
a

sticking
regulator
CHASSIS

valve

Vacuum

leakage
is

checked

by
di

reetly
measuring
the

negative

pressure

after

removing
the
vacuum

pipe

A

puncture
of
the

vacuum
dia

phragm
can
be

easily
ascertained

because
the

torque
converter

oil
is

absorbed
into
the

engine
and
the

exhaust

pipe
blows

up
the
white

smoke

4

Checking
items

when
the
line

pressure
is

increasing

In
trJs

checking
the
line

pressure

should
be
measured
with

vacuums
of

450
mmHg
and
0

mmHg
in
accordance

with
the
stall
test

procedure

test

procedure

1
If
the
line

pressures
do

not

increase

despite
the
vacuum
decrease

check
whether
the
vacuum
rod
is

incorporated

2
If

the
line

pressures
do
not
meet

the
standard
it
is
caused

mostly
by
a

sticking
pressure
regulating
valve

pres

sure

regulating
valve

plug
or

amptifier

TROUBLE
SHOOTING

CHART

Inspecting
items

1

Inspection
with

automatic

trans

mission
on

vehicle

J

AT
54
A
Oil

level

B

Range
selecr

linkage

C
Inhibitor
switch
and

wiring

D

Vacuum

diaphragm
and

piping

E

Downshift
solenoid
kick
down

switch
and

wiring

F

Engine
idling
rpm

G

Oil

pressure
throttle

H

Engine
stall

rpm

I
Rear
lubrication

J

Control
valve

manual

K

Governor
valve

L
Band

servo

M
Transmission
air
check

N
Oil

quantity

o

Ignition
switch
and
starter

motor

P

Engine
adjustment
and
brake
in

spection

2

Inspection
after

inspecting
auto

matic
transmission

on
vehicle

m

Rear
clutch

n
Front
clutch

q
Band

brake

r

Low
and
reverse
brake

s

Oil

pump

Leakage
of
oil

passage

u

One

way
clutch
of

torque
converter

v

One

way
clutch
of
transmission

w

Front
clutch
check
ball

x

Parking
linkage

y
Planetary
gear

CHASSIS

Trouble

shooting
guide
for

3N71B
Automatic
Transmission

Order
Test
item

Checking
Oil

level

gauge

2
Downshift
solenoid

3

ManuaIlinkage

4

Inhibitor
switch

5

Engine
idling
rpm

6
Vacuum

pressure
of
vacuum

pipe

7

Operation
in
each

range

8

Creep
of
vehicle

Stall
lest
Oil

pressure
before

testing

2
Stall
test

3

Oil

pressure
after

testing

Road
test
Slow
acceleration

Ist
2nd

2nd
3rd

2

Quick
acceleration

Ist
2nd

2nd
3rd

3
Kick
down

operation

3rd
2nd
or

2nd
1st
Procedure

Check

gauge
for
oil

level
and

leakage
before

and
after
each

test

Check

by
sound
whether
solenoid

operates
when

depressing

accelerating
pedal

fully
with

ignition
key
ON

Check

changing
conditions
into

P
R

N
D
2

and
I

ranges
by
moving
selector
lever

Check

whether
starter

operates
in
N

and
tp

ranges
only

and
whether

reverse

lamp
operates
in
R

range
only

Check
whether

idling
rpm
meet
standard

Checking
whether
vacuum

pressure
is
more
than
450

mmHg

in

idling
and

whether
it

decreases
with

increasing
rpm

Check
whether
transmission

engages
positively
by
shifting

N
o
D
N
2
N
I

and
N
R

range

while

idling
with
brake

applied

Check
whether
there

is

any

creep
in
D
2
I
and

R

ranges

2
1

and
R
range
Measure
line

pressures
in
D

while

idling

Measure

engine
rpm
and
line

pressure
in
D
2
I

and

R

ranges
during
fullthrallIe

operation

Notes

a

Temperature
of

torque
converter
oil

used
in
test
should

be

from
600
to
lOOoC

1400
to
2120F
i
e

sufficiently

warmed

up
but
not
overheated

b

For

cooling
oil

between
each
stall
test
for
D
2

1

and
R

ranges
idle

engine
i
e

rpm
at
about

1
200

rpm
for
more
than
1
minute
in
P

range
Measurement

time
must
not
be
more
than
5
secon

Same
as
the
item
I

Check
vehicle

speeds
and

engine

rpm
in

shifting
up
1st

2nd

range
and
2nd
J
3rd

range
while

running
with

lever
in

D

range
and

engine
vacuum

pressure
of

about
200

mmHg

Same
as

the
item
1
above

except
with

engine
vacuum

pressure
of
0

mmHg
i
e
in

position
just
before
kick

down

Check
whether
the
kick
down

operates
and

measure
the

time

delays
while

running
at
30
40
50

60
70
km
h

19

25
31
38
44
MPH
in
D

range

AT
58