1977 DATSUN PICK-UP ECO

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

I

and
R

positions

Back

up
lamp
should
also

light

when

selector
lever
is

placed
in

R

position

S
After

converter
is
installed

rotate

10

Check
level
of
oil
in
transmis

crankshaft
several
turns
and
check

to

be
sure
that
transmission

rotates

freely
sion

For
detailed

procedure
see

page

AT48

without

binding

6
Pour

recommended
automatic
II

Move
selector
lever

through
aU

positions
to
be

sure
that
transmission

transmission

fluid

up
to
correct
level

operates
correctly

through
oil

charge
pipe

verter
to
transmission
measure

dis

With
hand

brake

applied
rotate

tan
A

to
be
certain

that

they
are
7

Connect
manual
lever
to
shift

engine
at

idling
Without

disturbing

correctly
mbi
d

S
F
rod

Opeiationsliould
oecaTrie
f
bue

the
above

sclUng
ffiovTSelector
lever

AT

50
with

manual
and
selector
levers
in

through
N

to
D
to
2

to
I

Distance
A
N

and
to
R
A

slight
shock
should
be

More
than
21

5
mm
0
846
in
8
Connect

inhibitor
switch
wires

felt

by
hand

gripping
selector

each

time
transmission
is
shifted
Automatic
Transmission

4
Bolt
converter
to
drive

plate

Note

Align
chalk
marks

painted
a

cross
both

parts
during
disas

sembling

processes

AT116

Fig
AT
49

Torque
converter

aligning
cu
t

3
When

connecting

torque
can

A

ATl17
Notes

a
Refer
to

covering
topic

under

Checking
and

adjusting

inhibitor
switch
n

on

page

AT
49

b

Inspect
and

adjust
switch
as

above
whenever
it
has
to

be

removed
for
service

Fig
AT
50

Installing

torque
converter
9
Check
inhibitor
switch
for

op

eration

AT
34
Note

See

page
AT

49
for

checking

engine
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

52

13

Perform

stall

test
as

per
the

instructions

on

page
AT

50

Automatic
Transmission

i

r

11

I

@
@
j

A

T290

Assembly

I
Prior
to
assembly
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

compressed
air

from

apply

side
of

piston
to
test

for
definite

piston
operation
as
shown
in

Figure

AT
93

7
i
8

ror
1

1
r

c

f

f
A

J

II
1

0

c
r

1

1
I

@

L
O
j

0
n

iJ

fl
IV
I

AT160

Fig
AT
93

Testing
piston

Apply
side

4
With

apply
side
of

piston
plugged

with
thumb
blow

compressed
air
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
loose

calling
for

retightening
1
Anchor
end

pin

2
Band

strut

3

Apply

4
Release

5
Return

spring

6
Band
servo

piston
stem

7

Band
servo

piston

8
Servo
retainer

9
Brake
band
assembly

10

Transmission
case

Fig
AT
92
Sectional
view

ofseruo
piston

7
o

i
J

1S

I

z
1
Y

i
1

t
9
c
fa

AT161

Fig
AT
94

Testing
piston

Release
side

GOVERNOR

Disassembly

I

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
that
order

as
shown
in

Figure

AT

95

To
control

val

i
1

3

5MI
n

ID
r

Ii

I

4

From
control
valve

Line

pre
sure

I

I
A
TOgO

4
Oil

distributor

5

Output
shaft
I

Primary
governor

2

Secondary
governor

3
Governor
valve

body

Fig
AT
95

Testing
secondary

govemor

AT
43
3

If

primary
governor
is
to
be

dis

assembled
for

any
purpose
remove

spring
seat

primary
governor
valve

spring
and

spring
seat

Inspection

I
Check
valve
for

faulty
condition

Replace
spring
if
found
weakened

beyond
use
Faulty

piston
should
also

be

replaced
with
a
new
one

2
Examine
to
see
if

primary
gover

nor
slides

freely
without

binding

3
To
determine
if

secondary
gaver

nor
is
in

good
condition
blow
air

under

light

pressure
into
hole
at
A

and
listen
for
noise
like
that
of
a

model

plane

Assembly

Reverse
disassembly

procedure
to

assemble

governor

Note
Do

not
confuse

primary
gover

nor
with

secondary
governor
After

installation
check
that

spring
is
not

deflected

OIL
PUMP

Disassembly

I
Free

pump
cover
from

pump

housing
by
removing
attaching
bolts

2
Take

out
inner
and
outer

gears

from

pump
housing

Inspection

I

Inspect
for
wear
or

damage
to

gear
teeth

Replace
rubber

ring
if

found

damaged
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
0008100
0016
in

Replace
if
over
0
08
mm
0
00
11

in

Fig
AT

96

Measuring
clearanc
Automatic
Transmission

6

u

ST255801JOO

AT264

Fig
AT

99

Measuring
runout

5

Tighten
pump
securing
bolts
to

specified

torque
0
6
to
0
8

kg
m
4

to
6
ft
Ib
Clearance

between
seal

ring
and

ring

groove
See

Figure
AT

97

Standarddearance
Note
Be
sure
to

a1ign
converter

0
04
io
0
16
mm
housing
securing
bolt

holes

0
0016
to
0
0063
in

6

Again
check
the

runout

of
oil

pump
cover

I
learance

Seal

ring

q

I

n
l

1
AT

5

Fig
AT
97

Measuring
clearance

Assembly

I

Set

up

pump
housing
with
inner

and
outer

pump
gears
on
it

2

Using
Oil

Pump

Assembling

Gauge
ST25580000

instail

pump

coverta

pump
housing
as
shown

in

Figure
A

T

98

ST

5

000

J
I

I

JL

AT166

Fig
AT
98

Centering
oil

pump

3

Temporarily
lighten

pump
secur

ing
bolts

4

Set

the
runout
of
oil

pump
cover

within

0
D7
mm
0
0028
in

total

indicator

reading
See

Figure
AT
99
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
of

component
is

faulty

replace
the
carrier

as
a
unit

Inspection

Check
clearance

between

pinion

washer
and

planetary
carrier
with

a

feeler

See

Figure
AT

100

Standard
clearance

0
20
to

0
70
mm

0
0079
to
0
0276
in

Clearance

I

Jr

I
1

11

r

AT167

Fig
AT
100

Measuring
pinion
washer

to

ca
ier

clearance

AT
44
Replace
if

over
0

80
mm
0

0315

in

CONTROL
VALVE

The

control
valve

assembly
consists

of

many
preci
ion

parts
and

requir
s

extreme

care
when
it
has
to

be
reo

moved
and
serviced
It

is

good
practice

to

place
parts
in

a

part
rack
so
that

they
can
be

reassembled
in

valve

body

in

their

proper
positions
Added
care

should
also
be

exercised
to

prevent

springs
and
other
small

parts
from

being
scattered
and
lo
t

Before

assembly

dip
all

parts
in

clean
automatic
transmission

fluid
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

di
ssembled
and

flushed

Disassembly

I
Remove
bolts

and
nuts
which

retain
oil

trainer
Bolts

may
be
re

moved

with
a
screwdriver
but
it

is

recommended
that

Hexagon
Wrench

HT610oo800
and

Spinner
Handle

HT62350000
be
used
See

Figure

AT
101

HT61000800

Fig
AT
101

Disassembling
valve

body

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

vah
e

and
valve

spring
in
lower
valve

body
to
be
scattered
and
lost
when

removing
separate
plate

I

F
1

D

t
l

a

J
n
f

19l1
Ull

IU
P

C
o
J

CJ
IODrR

CC

t

LL6
SJQIl2J

lhl

fB

rt

AT169

Fig
AT
102

Removing
separate

pllJte

3
Pull

out
manual
valve

as
shown
in

Figure
Ar103

4

Remove
side

plate
Take

out

1st
2nd
shift
valve
2nd

3rd
shift

valve

pressure
modifier

valve
and

three

valve

springs
See

Figure
AT

104
Automatic
Transmission

Fig
AT
103

Removing
manual
val

AT1
1

HT61000800

Fig
AT
104

Removing
side

plate

g

p

e

eguJa

Of
le6Ve
or

r
essure
reguJl

oL

@iO
I
f

g

SecOni
J

lOCltvalYi
y

h

l
l

2I
r

JI
Io
J
l

j

t

1

i

S

r
0

x

t

i

3
1
Note
Do
not
w
it

off
with
screw

drivers
To

avoid

darnagingmachine

screws
do

not
work
it
ff
with

screwdriver

5

Remove
side

plate

pull
out

pres

sure

regulator
valve
second
lock

valve

pressure

regi1lator
plug
and
two

valve

springs

6

Remove
side

plate
With

side

plate
removed
solenoid
downshift

valve
throttle
back

up
valve

vacuum

throttle
valve
2

d
3rd
t

ing
valve

and
three
valve

springs
are
free
for

removal

2nd
3rd

timing
talve

r

en

i
C1iJrilth

rottle
lI

lY
e

M
a

alVSY
I

j1

f

I
1

f
Iv

I

f
2i
3

CP

g

f
st

2nd
S
t
a

el

2i1d

3
d
St1itLvalv

so

iit
a

stiift

V81v
i

hrottle

f

iicnjp
VB
y
i

P

ie
mo

i

Inspection

r

I

Check
valves
for

sign
of

burning

and
if

necessary
replace

2
Check
to

be
certain
that

oil

strainer
is
in

good
condition

If
found

damaged
in

any
manner
disCard

3

Test
valve

springs
for

weakened
Fig
AT

105

Components
ports
of
control
uolue

tension

if

necessary
replace

4

Examine

for

any

sign

oLdamage

or

score
marks
on

separate

plate
If

left
unheedcd

oiL
will

bypass
correct

oil

passages
causing
many
types
of

abnormalities

in

thesystem

AT45
5
Check
oil

passages
in

valve
b

dy

for

sign
of

damage
and
other
condi

tions
which

might
interfere
with

prop

er
valve

operation

6
Check
bolts
for

stripped
threads

Replace
as

required

Automatic
Transmission

Valve

spring
chart

Mean
coil
Installed

Valve

spring
Wiredia

dia
No
of

free

length

mm
in

mm

in
active
coil

mm
in

Length
Load

mm
in

kg
lb

Manual

detent
1
3
6
0
15

0

32
4

26
5

5
5

0
051

0
236
1
276
1
043

12
1

Pressure

regulator
1
2
10
5
13

0
43

0
23
5
2

8

0
047
0
413

1

693
0
925
6

2

Pressure
modifier
0
4

8
0

5
0

18
5

9
0
0
1

0

016
0
315

0
728

0
354
0
2

1st
2nd
shift
0
6
6
0

6
0
32
0
16

0
0
625

0

024
0

236
1
260
0

630
1
378

2nd

3rd
shifl
0
7
6

2
8
0
41

0
17
0

1
40

0
028
0
244

1

614

0
669
3

09

2nd
3rd

timing
0
7
5
5
15

0

32
5
27
0
0
55

0
028

0
217

1
280
1
063
1
21

Throule
back

lIP
0
8

6
5

14

0
36
0
18
8
1

92

0
031

0
256

1417
0
740
4
23

Solenoid
downshift
0
55

5
0
12

0
22
0

12
5
0

60

0
0217
0

197

0
866
0
492

1
32

Second
lock
0
55

5
0
16
0

33
5
21
0
0
60

0

0217
0

197

1
319
0
827

1
32

Throule

relief
0

9
5

6
14
0

26
8
19
0

2
9

0
035
0

220

1
055
0
748
4
83

Orifice
check
0
23
4

77
12
0

J5
5
11
5

0
01

0
0091
0
1878

0
610
0
453

0
02

Primary
governor
0
45
8
3
5
0

21
8
7
5
0

215

0
0177
0
327

0
858
0
295
0
474

Secondary

governor
0
7
8
5

5
5
25
1
10
5

I
10

0

028
0
335
0
988
0
413

2
43

Free

lenglhm
A
installed

f

n
ri

DO
n
i

Wire
dia

AT172
Assembly

Assemble
in

reverse
order
of
disas

sembly
However

observe
the
follow

ing
assembly
noles
Refer
to

Valve

Spring
Chart

and
illustralion
in

as

sembling
valve

springs

Dip
all

parts
in

clean
automatic

transmission
fluid

before

assembly

Tighten
parts
to

spec
ifications
when

designated

I
Slide

valve
into
valve

body
arid

be

particularly
careful
that

they
are
not

forced
in

any
way

2

Install
side

plates
using
Torque

Driver

ST25160000
and

Hexagon

Wrench
HT6
I

000800
See

Figure

AT
l
07
Fig
AT
106

Value

spring

AT
46

Automatic
Transmission

TROUBLE

DIAGNOSIS
AND
ADJUSTMENT

INSPECTION
AND
ADJUSTMENT

BEFORE

TRQUBLE
DIAGNOSIS

TESTING

INSTRUMENT
FOR

INSPECTION

CHECKING
OIL

LEVEL

INSPECTION
AND
REPAIR
OF

OIL
EAKAGE

CHECKING

ENGINE
IDLING

REVOLUTION

CHECKING
AND
ADJUSTING

KICKDOWN

SWITCH
AND

DqWNSHIFT
SOLENOID

N
J
J
CII
Q

t
L
8li
p

JYSTMs
T
OF

MANUAL
LINKAGE

CHECKING
AND

ADJUSTING

INHIBITOR

SWITCH

STALL
TEST

STALL
TEST

PROCEDURES

JUDGEMENT

Since
most
automatic

transmission

troubles

can
be

repaired

by
simple

adjustment
do
not
disassemble
im

mediately

Firstly

inspect
and

adjust
the
auto

matic
transmission

in

place
utilizing

the
Trouble

Shooting
Chart

If
the
trouble
can

not
be
solved

by

this

procedure
remove
and
disas

semble

the
automatic
transmission

It

is

advisable
to
check

overhaul
and

repair
each

part
in
the

order
listed
in

the
Trouble

Shooting
Chart

I
In
the
Trouble

Shooting
Chart

the

diagnosis
items

are

arranged
ac

cording
to

difficulty
from

easy
to

difficult
therefore

please
follow
these

items
The
transmission
should
not

be

removed
unless

necessary

2
Tests
and

adjustments
should
be

made
on
the
basis
of
standard
values

and

the
data

should
be
recorded

INSPECTION

AND

ADJUSTMENT

BEFORE

TROUBLE
DIAGNOSIS

TESTING
INSTRUMENT
FOR

INSPECTION

I

Engine
tachometer

2
Vacuum

gauge
ROAD
TEST

VEHICLE
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

At
49

TR6
uBLE
SHOOTINC
CHART

INSPECTING
ITEMS

TROUBLE

SHOOTING
CHART
FOR

3N71B

AUTOMATIC
TRANSMISSION

TROUBLE

SHOOTING
GUIDE
FOR

3N71B

AUTOMATIC
TRANSMISSION
CONTENTS

AT
4B

AT
48

AT
4B

AT

49

AT
49

AT
49

AT
49

AT
50

AT

50

AT
50

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
o
illevel
and
the
condition
of

oil
around
the
oil
level

gauge
should
be

examined
This
is

an

easy
and
effective

trouble

shooting

procedure
since

some

changes
in
oil
condition

are
often

linked
with

developed
troubles

For
instance

Lack
of
oil
causes

faulty
operation

by
making
the
clutches
and

brakes

slip
resulting
in

severe
wear

This
is
because
the
oil

pump
sucks

air

causing
oil

foaming
thus

rapidly

deteriorating
the
oil

quality
and

pro

ducing
sludge
and

varnish

Excessive
oil
is

also
bad
because
of

oil

foaming
caused

by
the

gears

stirring

up
the
oil

During
high
speed

driving

excessive

oil
in

the

transmission
often

blows
out

from
the
breather

Measuring
011
level

To
check
the
fluid
level
start
the

engine
and
run
it
until
normal

operat

T
AO
AT
51

AT
51

AT

52

AT
52

AT
52

AT

52

AT

53

AT
3

AT

53

AT

53

AT

54

AT
57

ing
temperatures
o

temperature
SO

to
800C

122
to
l760F

Approxi

mately
ten

minute
of

operation
will

raise
the

temperature
to
this

range

and

engine

idling
conditions

are
stabi

lized
Then

apply
the
brakes
and

move
the

transmission
shift
lever

through
all
drive

positions
and

place
it

in

park
P

position
In

this

inspec

tion
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

temper

ture
becomes

sufficiently
high

1

Fill
the
oil
to

the
line
H
The

difference
of

capacities
between
both

H
and
L
is

approximately
0
4

liter
Ji
V
S

p
Y

Imp
pl
and

therefore
do

not
to
fill

beyond
the

line

H

2
When

topping
up
and

changing

oil
care
should
be
taken
to

prevent

mixing
the
oil
with
dust
and
water

InspectIng
011

condition

The
condition
of

oil

sticking
to
the

level

gauge
indicates
whether
to
over

haul
and

repair
the
transmission

or

look
for
the

faulty

part

If
the
oil
has
deteriorated
to
a

varnish
ike

quality
it

causes
the

con

trol
valve
to
stick
Blackened
oil
indi

cates
a
burned
clutch
brake
band
etc

Using
the

tester
check
the

two

black

yellow
BY
wires
from
the
in

hibitor
switch
in
the

ranges
N

and

I
and
the

tw
re
d

black

RBj
wir
s

in

the

range
R
for

continuity
Turn

range
select
lever
in
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
30

on
both

sides
from
each
lever
set
line
How

ever
if
its

continl
ity

range
is
obvious

ly
unequal
on

both
sides

adjustment
is

required

If

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

clicking
sound

MSlVe
the

switch

slightly
asj
Je
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
mm
0
059
in
diameter

pin
into

the
holes
If

the

alignment
is
correct

fasten

the
switch

body
with
the
bolts

pull
out
the

pin
tighten

up
the
screw

in

the
hole
and
fasten
the
selector

lever
as
before
Check
the

continuity

again
with
the
tester
If

the
malfunc

tion
still

remains

replace
the
inhibitor

switch
Chcck
whether
the

reverse

lamp

and
the
starter
motor

operate
normal

ly
in
these

ranges
If
Ihere
is

any

lrouble

first
check
the

linkage
If

no

fault
is
found
in

the

linkage
check
the

inhibitor
switch

Separate
the
manual
lever
from
Ihe

remote
control
selector

rod
and
turn

the

range
selcct

lever
to

N

Note

In
the

position
N

the
slot
of

the

manual
shaft

is
vertical

STALL
TEST

The

purpose
of
this
test
is
to
check

the
transmission

and

engine
for
trou

ble

by
measuring
the
maximum
num

bers
of
revolutions
of

the

engine
while
Automatic

Transmission

vehicle
is
held
in
a

stalled

condition

The
carburctor
is
in

full
throttle

opera

tion
with

the
selector
lever
in

ranges

f
2

and
I

respectively
Com

pare
the

measured
results
with
the

slandard

values

Components
to

be
tested

and

test

items

I
Clutches
brake

and
band
in
trans

mission
for

slipping

2

Torque
converter

for

proper
fune

tioning

3

Engine
for
overall

properly

STALL
TEST

PROCEDURES

Before

Icsting
c
heck
the

engine
oil

and

torque
converter

oil
warm

up
the

engine
cooling
water
to
suitable
tem

perature
by
running
at

1
200

rpm
with

the
selector
lever
in

the

range
P
for

several
minutes
Warm

up
the

torque

converter
oil
to
suitable

temperature

6010
1000C
140
to

2l20F

I

Mount
the

engine
tachometer
at
a

location
that
allows

good
visibility

fro

the
dri
er
s
seat
and

put
a
mark

on

specified
revolutions
on
the
meter

2

Secure
the
front
and
rear
wheels

with
chocks
and

apply
the
hand
brake

Be
sure
to

depress
the
brake

pedal

fumly
with
the
left
foot
before
de

pressing
the
accelerator

pedal

3
Throw
the
selector
lever
into

the

range
1

4

Slowly
depress
the
accelerator

pedal
until
the

throttle
valvc
is

fully

opened

Quickly
read
and
record
the

engine
revolution
when

the

engine

begins
to
rotate

steadily
and
then

release
the
accelerator

pedal

5

Shift
the
selector
lever
to
N

and

operate
the

engine
at

approxi

mately
1
200

rpm
for
more
than
one

minute

to
cool
down
the

torque
con

ver
ter
oil

and
coolant

6

Make
similar
stall
tests
in

ranges

2
I
and
RIO

Note
The
stall
test

operation
as

speci

f
d
in
item
4

should
be

I
l3de

wiihin
five
seconds
If
it

takes
too

long
the
oil
deteriorates
an

the

clutches
brake

and
band
are
ad

versely
affected
Sufficient
cooling

time
should
be

given
between
each

AT
5O
test
for
the
four

ranges
0
2

I
and
R

JUDGEMENT

High
stall
revolution
more

than

standard
revolution

If
the

engine
revolution
in
stall

condition
is

higher
than
the
standard

values
it

indicates
that
one

or
more

clutches
in

the
transmission
are

slipping
and
therefore
no
further
test

is

required

For
the

following
abnormalities

the

respective
causes
are

presumed

High

rpm
in

all

ranges
low
Iine

pressure

High
rpm
in
D
2
and
I

and

normal

rpm
in
R
Rear
clutch

slipping

High
rpm
in
0

and

normal

rpm
in
I

clutch

slipping

High
rpm
in
R

only
Front

clutch
or
low
and
reverse

brake

slipping

To

determine
which
is

slipping

front
clutch
or
low

and
reverse
brake

a
road
test
is
nceded

If
whilc

coasting
after

starting

with
the
lever
in
1

range
engine

braking
does

not
work

properly
the

low
and

reverse
brake
is

slipping

Otherwise
the
front
clutch
is

slipping

Slipping
of
the
band
brake
is

diffi

cult
to
ascertain

However
if
it

occurs

with
the
lever
in
2

range

engine

revolution
increases

Jp
to
thesarne

level
as
in

I

strange
It

is

impossible

to
check

it
in
the
stall
test
2
and

One

way

2
Standard
stall
revolution

If
the

engine
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

tIle

engine
and
one

way

clutch
of
the

torque
converter
are

normal
in

performance
and

operation

The
one

way
clutch
of

the

torque

converter
however
sometimes

sticks

This
is
determined
in

the
road
test

3
Lower
stall
revolution
than
stand

ard
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

Others

1
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
clutch
is

slipping
Automatic
Transmission

2
If
the

torque
converter
s
one

way
clutch
sticks
vehicle

speed
can

not
exceed

approximately
80
km
h

50

MPH
in

the
road
test
In
such
a

case
the

torque
converter
oil
tem

perature
rises

abnormally
and

so

special
care
is

required

3
If
the

transmission
does

not

op

erate

properly
at
all
vehicle

speeds
it

indicates

poor
engine
performance

VEHICLE
SPEED
AT
GEAR

SHIFT

Throttle

opening
mmHg

Kickdown
0

Half
throttle
200

Fuol
throttle
0

Minimum

throttle
450
ROAD
TEST

An
accurate
knowledge
of
the

auto

JT
l
ltic
transmission
is

required
for

an

exact

diagnosis

It
is
recommended
that

a
diagnosis

guide
chart
with
the
standard
vehicle

speeds
for
each

stage
of
the

up
and

down

shiftings
be

prepared
Measured

vehicle

speeds
are
to
be

filled
in

the

adjoining
column
after
each

testing

Also
it
is
advisable
to
mount
a

stopper
for

positioning
the
throttle

opening

Gear
shift
Vehicle

speed
km
h

MPH
Propeller
shaft

rpm

Dl
D2
51

to
65
32
to
40
1

840
to
2

340

D2
D3
92

to
106
57

to
66
3

340
to
3
840

D3
D2
96
to
82
60
to

51
3

460
to
2
960

D2
Dl
49

to
36

30
to
22
1
790
to
1

290

Dl
D2
9t023
6toI4
330to
830

D2
D3
48
to
61
30
to
38
1
720
to
2

220

D3
D2
or

D3
Dl
37

to
24
23

to
15
1

350
to
850

D2
Dl
19
12
700
Max

12
I
51
to
38
32

to
24
1
860
to
1

360

1

12
I
51

to
38
32
to
24
1
860
to
1

360

1

Reduce
the

speed
by

shifting
to
I

range
from
D

range
output
shaft
2
000

rpm

Vehicle

speed
can
be
calculated

by
the

following
formula

V
2
x
1f
x

r
x

Np
x
60

RF
x

1
000

V
Vehicle

speed
km
h

Np

Propeller
shaft
revolution

rpm

R
Final

gear
ratio

r
Tire
effective
radius
m

TT

The
ratio
of
circumference
of
a
circle
to
its
diameter
3
14
Note

where

RF
4
375

r
0
321
6
00
14

AT

51