1977 DATSUN PICK-UP oil

Automatic
Transmission

TROUBLE
SHOOTING
GUIDE
FOR
3N71B
AUTOMATIC

TRANSMISSION

Order
Test
item

Checking
Oil
level

gauge

2
Downshift
solenoid

3

Manuallinkage

L

4
Inhibitor
switch

5

Engine
idling
rpm

6
Vacuum

pressure
of

vacuum

pipe

7

Operation
in
each

range

8

Creep
of
vehicle

Stall
test
I

Oil

pressure
before

tesling
1

2
Stall
test

3
Oil

pressure
after

testing

Road
test
Slow
acceleration

I

st
2nd

2nd
3rd

2

Quick
acceleration

lst
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
for
sound
of

operating
solenoid
when

depressing

accelerator

pedal
fully
with

ignition
key
ON

Check

by

shifting
into

P
lR
IN
D
2
and
I

ranges
with
selector
lever

Check

whether
starter

operates
in
N
and
p

ranges
only

and
whether
reverse

lamp
operates
in

R
range
only

Check
whelher

idling
rpm
meet

standard

Check
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
0
N

2
N

l
I
and
N
R

range

while

idling
with
brake

applied

Check
whether

there
is

any
creep
in
D
2

R

ranges
and

Measure
line

pressures
in
D
2
I
and
R

range
while

idling

Measure

engine

rpm
and
line

pressure
in
D
2
I

and

R

ranges
during
full
throttle

operati
n

Notes

a

Temperature
of

torque
converter
oil
used
in
test
should

be
from
600

to
1000C
1400
to
2120F
i
e

sufficiently

warmed

up
but
not
overheated

b
To
cool
oil

between
each
stall
test
for
D
2
I

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
seconds

Same
as
item
I

Check
vehide

speeds
and

engine
cpm
in

shifting
up
Ist

2nd

range
and
2nd
Jo3rd
range
while

running
with
lever
in

D

range
and

engine
vacuum

pressure
of
about
200

I11I1lHg

Same

as
item
1
above

except
with

engine
vacuum
pressure

of
0

mmHg
i

e
in

position
just
before
kickdown

Check
whether
the
kickdown

operates
and
measure
the
time

delays
while

running
at
30
40
50
60
70
km
h
18
25
30

37
43
MPH
in

D3
range

AT

57

Automatic
Transmission

Order
Test
item

4
Shift
down

Dr
O2
0

5

Shift
down

DJ
12
1

6
Shift
down

DJ
2

7
Shift

up

I

12

8
Shift

up
or
down
when

start

iog
in

2

range

9

Parking

Others
Abnormal
shock
oil

leakage
Procedure

Check
vehicle

speeds
and

engine
rpm
in

shifting
down
from

3rd
2nd
I

st

sequentially
while

coasting
with

accelerater

pedal
released
in

D3
range
and

engine
vacuum

pressure
of
about
450

mmHg

Check
for

shifting
down

OJ
12
and

engine
braking
and

further
for

shifting
down

12
I
and

engine
braking
after

shifting
the
lever
into

I

range
with
the
accelerator

pedal

released
and
the

engine
vacuum

pressure
of
0

mmHg
while

driving
at
about
50
km
h

30
MPH
in

OJ
range

Check
for

quick
shifting
down

0
2
and

engine
biaking

after

shifting
the

lever
into
2

range
while

driving
at
about

50
km
h
30
MPH
in

OJ
range

Further
check
for

locking
of
the

transmission
in

2nd

gear

ratio

regardless
of
vehicle

speed

Check
for
failure
of
the
transmission
to
shift

up
during

acceleration
when

starting
in
I

range

Check
the
transmission

for
not

shifting
up
or
down

during

acceleration
or
deceleration
when

starting
in

2

rang

Confirm
that
vehicle
will
not
move
on

grade
when

shifting

to

P

range

Enter
into
record
conditions
observed

during
these
tests

such
as

gear
noise

abnormal
clutch
noise
and

acceleration

performance

AT
58

Automatic
Transmission

SERVICE
DATA
AND
SPECIFICATIONS

General

specifications
AfT

Torque
converter

Type

Stall

torque
ratio
Symmetrica13
element
I

stage

2

phase
torque
converter

2
0
I

Transmission

Type

Control
elements

Multiple
disc
clutch

Band
brake

Multiple
disc
brake

One

way
clutch

Gear
ratio

1st

2nd

3rd

Reverse
3

speed
forward
and

one
speed

reverse
with

planetary
gear
train

2

I

I

I

2

458

1458

1

000

2
182

Selector

positions
P
Park

R

Reverse

N
Neutral
Transmission
is

placed
in

neutral

Output
shaft
is

fIXed

Engine
can
be
started

Backward

running

Transmission
is
in

neutral

Engine
can
be

started

Up
or
downshifts

automatically
to

and
from
I

st
2nd
and

top

Fixed
at
2nd

Fixed
at
low

or
downshifts
from

2nd
o
Drive

2
2nd
lock

I
Lock

up

Oil

pump

Type
Internally
intermeshing
involute

gear
pump

Number
of

pump

Oil
Automatic
transmission
fluid

DEXRON

type

5
5

liters

SUU
s

qt
4Ulmp
qt

Approximately
2
7
liters

2UU
s

qt
2XIrnp

qt

in

torque
converter

Controlled

by
measuring
the

nega

tive

pressure
of
intake
manifold

and
the
revolution
of

output
shaft

Forced
lubrication

by
an
oil

pump

Water
cooled

by
a
circulation

type

auxiliary
cooler

located
at
the

radiator
Capacity

Hydraulic
control

system

Lubrication

system

Cooling
system

AT
59

Automatic

Transmission

Engine

Idling
and

stall

revolution

Idling
revolution

Stall

revolution
rpm

rpm
6S0
ai
0

position

2

000
to

2

200

TIghtening
torque

kg
m
ft
lb

Drive

plate
to

crankshaft

Drive

plate
to

torque
converter

Converter

housing
to

engine

Transmission
case
to

converter

housing

Transmission
case
to

rear
extension

Oil

pan
to
transmission

case

Servo

piston
retaine
T

to

transmission
case

Pislon
slem
when

adjuting
band
brake

Piston

stem
lock
nut

One

way
clutch
inner

race

to
transmission

case

Control
valve

body
to

transmission
case

Lower
valve

body
to

upper
valve

body

Side

plat
to

control
valve

body

Nut
for
control
valve

reamer
bolt

Oil
strainer

to
lower

valve

body

Governor

valve

body
to

oil
distribu
tor

Oil

pump
housing
to

oil

pump
cover

Inhibitor
switch
to
transmission

case

Manual
shaft
lock
nut

Oil
cooler

pipe
to
transmission
case

Test

plug
oil

pressure
inspection
hole

Support
actuator

parking
rod

inserting
position
to

rear
extension

I

Oil

charging
pipe
to
case

Dust

cover

to
converter

housing

Selector

range
lever
to
manual
shaft
14

0
to

16
0
101
to

116

4
0
to
5
0

29
to

36

4
0

to
S
O

29
10

36

4
S
to
5
5

33
to

40

2
0
to

S

14
to
18

O
S
to

0
7

4

to
S

O

S
to

0
7
4
to
S

1
2
to
1
5

9
to
11

1
5
to
4
0

I
I

to
29

1
3
to
1

8
9

to
13

0

5S
to
0
75
4
to
S

0
25

to
O
3S

2
to
3

0

25
to

0
35
2
to
3

O

S
to

0
7
4
to
S

0

25
to
0
35

2
to
3

D
S

100
7
4
to
5

0

6
to
0

8
4
to
6

0
5
to

0
7
4
toS

3
0

to
4

0
22

to
29

3
0
to

S
O

22
to

36

I
4to
2
1

10
to
IS

0
8
to
I
1
6
to
8

O
5S
to
0
7S

4
to
S

O
5S
to

0
75
4
to
S

3
0
to
4

0
22
to
29

Turn

back
two

turns
after

tightening

AT
61

Automatic
Transmission

SPECIAL
SERVICE
TOOLS

No
Tool
number

tool
name
Description
For

use

on
Reference

page
or

Figure
No

Oil

pressure
gauge

set
3N71B

Fig
AT
11
2

and

3N71A

AfT
ST2S0SS001
Use
for

checking

hydraulic
pressure

SE119

2
ST07870000
Use
for

setting
transmission
3N71

B
Page
AT

36

AfT

Transmission

case
stand

SE120

3
ST2S850000
Use
for

removing
oil

pump
3N7IB

Fig
AT
S6

and

Sliding
hammers

3N71A

J
AfT

JIB

SE121

4
ST2S42000I
Use
for

assemblilJg
or

disassembling
front
and

rear
clutch
3N71B

Fig
AT
79

and

Fig
AT
86

Clutch

spring
3N7lA

compressor
AIT

SE
122

3N71B

Fig
AT
69

and

3N71A

AlT
Torque
wrench
Use
for

tightening
correct

torque

Max
torque
4

6

kg
m
0

33
ft

lb

Drive

angle
3
8

square
S
GG93010000

SE123

AT
62

AutomaJic
Transmission

No
Tool
number

tool
name
Description
For

use

on
Reference

page
or

Figure
No

II

HT623S0Q00
Use
for

disassemlbing
and

assembling
control
valve

3N71B

and

3N71A

AIT
Fig
AT
IOI

Fig
AT

I04

Spinner
handle

SE129

12
HT61000800
Use
for

disassembling
and

assembling
control
valve

3N71B

Fig
AT
IOI

and

Fig
AT
104

Hexagon
wrench

3N71A

Fig
AT
I07

AIT
Fili
AT
108

0

SE130

13
ST2SS80000
Use
for

centering
oil

pump
3N71B

Fig
AT

98

and

Fig
A

T
99

Oil

pump

3N71A

l
Ssemlbing
gauge

AIT

SE131

AT
1l
A

PROPELLER
SHAFT
DIFFERENTIAL
CARRIER

Watch
for
oil

leakage
from
trans

mission

end

Notes

a
Remove

propeller
shaft
carefully

so
as
not
to

damage

spline
sleeve

yoke
and
rear
oil
seal

b

Plug
up
the

opening
in
the
rear
of

rear
extension

housing
to

prevent

oil
from

flowing
out

To
install

reverse
the

foregoing

removal

procedure

1

Align
propeller
shaft
with
com

panion
flange

using
reference
marks

prescribed
in
removal

procedure
and

assemble
with
bolts

Tightening

torque

2
4

to
3
3

kg
m

17

to
24
ft
Ib

2

Insert
bolts

through
the
holes
of

center

beariug
bracket
and

torque
nuts

to
retain
center

bearing
on
cross

member

Tightening
torque

1
6

to
2
2

kg
m

12
to
16
ft
Ib

DISASSEMBLY
AND

ASSEMBLY

Primarily
do
not
disassemble

pro

peller
shaft
because
it
is

balanced
as
an

assembly

However
check

propeller
shaft

with

journal
for
movement
When

journal
does
not
move

smoothly
dis

assemble

1
Mark

propeller
shaft
and

journal

so
that
the

original
combination
can

be
restored
at
assembly

2
Remove

snap
ring
with
a
standard

screwdriver

3
Lightly

tap
base
of

yoke
with
a

hammer
and
withdraw

bearing
race

See

Figure
PD
4

PDOO5

Fig
PD
4
Remo

i
bearing
Note
When

removing
journal
from

yoke
be
careful
not
to

damage

journal
and

yoke
bole

When

disassembling
and

repairing

center

bearing
are

required
the
follow

ing
procedures
are

applied

1
Put
match
marks
on

flange
and

front

propeller
shaft
Remove
bolts

connecting

flange
yoke
to

companion

flange

2

Applying
Drive
Pinion

Flange

Wrench
ST3lS30000
loosen
off
lock

ing
nut
and

remove
center

bearing
See

Figure
PD
5

P0172
ST31530000

Fig
PD
5
Remouing
locking
nut

To
assemble
reverse
the
foregoing

procedure
using
reference
marks

pre

scribed
in

disassembly
procedure

New

bearing
need
not
be
lubricated

since
it
is

lubricated
for
life
Fill

joint

with
recommended
multi

purpose

grease
whenever

propeller
shaft
is

overhauled

Use
related

snap
rings
of
the
same

thickness
and
be
sure
that

play
is

below
0
02
mm
0
0008
in

Available

snap
ring

Thickness

mm
in
Color

identification

2
00
0
0787

2
02
0
079S

2
Q4
0
0803

2
06
0
08
II

2
08
0
0819

2
10
0
0827

2
12
0
83S

2
14

0
0843
White

Yellow

Red

Green

Blue

Right
Brown

No

paint

Pink

PD

3
Install
and
assemble

components

correctly
so
that

joint
moves
under

friction
resistance
of
less
than
is
o

kg
em

13
in
lb

When
the

above

steps
are
complete

place
the

shaft
in

a

balancing
machine

and

adjust
unbalance
less
than
3S

gr
cm
0
49
in

oz
at
S
800

rpm

Center

bearing
assembling
pro

cedures
are
as
follows

I
Install
center

bearing
in

center

bearing
insulator

2
Install
center

bearing

assembly

and

companion
flange
on
front
shaft

usiug
reference
marks
established
in

disassembly

procedure

3
Install
washer
and

locking
nut
on

front
shaft

and

tighten
nut

using
Drive

Pinion

Flange
Wrench
ST3IS30000
to

specified
torque

Tightening
torque

20
0

to
24
0

kg
m

I4S
to
174
ft
lb

4
Join

companion
flange
of
front

shaft

with

f1ange
yoke
of
rear
shaft

and

tighten
connect
bolts
to

specified

torque

Tightening

torque

2
4

to
3

3

kg
m

17
to
24
ft
Ib

S
Install
center

bearing
bracket

on

center

bearing

INSPECTION

I
Check

journal
pin
for
dent
or

brinell
marks
and

yoke
hole
for

sign

of
wear
or

damage

Snap
ring
bearing
and
seal

ring

should
also
be

inspected
to
see
if
these

are

damaged
worn
or
deformed
Re

place
if

necessary

2
heck
center

bearing

by
rotating

bearing
race
If
it
is

rough
noisy
or

damaged
discard
Cracked

bearing

insulator
cannot
be
tolerated
here

3
Check

propeller
shaft
tube
sur

face
for
dent
or
crack

Change
if

necessary

PROPELLER
SHAFT
DIFFERENTIAL

CARRIER

Condition
Probable

cause

Knocking
sound

during

starting
or
noise

during

coasting
on

propeller

shaft
Worn

damaged
universal

joint

Worn
sleeve

yoke
and

main
shaft

spline

Loose

propeller
shaft
installation

Loose

joint
installation

Damaged
center

bearing
or
insulator

Loose
or

missing
bolts
at

center

bearing

bracket
to

body

Scraping
noise
Dust

cover
on
sleeve

yoke
rubbing
on

transmission
rear
extension
Dust

c
ver
on

companion

flange
rubbing
on
differ
mtial

carrier

Whine
or
whistle

Damaged
center

bearing
Corrective

action

Replace

Replace

Retighten

Adjust
snap
ring

Replace

Replace
or

tighten
bolts

Straighten
out
dust
cover
to

remove

inter

ference

Replace

DIFFERENTIAL
CARRIER

TYPE
H190

CONTENTS

DESCRIPTION

REMOVAL

PRE
DISASSEMBLY
INSPECTION

DISASSEMBLY

INSPECTION

ASSEMBLY
AND

ADJUSTMENT

PRECAUTIONS
IN
REASSEMBLY

ASSEMBLY
OF
DIFFERENTIAL
CASE
PD
5

PD
7

PD
7

PD
7

PD
8

PD

PD
8

PD
8

DESCRIPTION

The

differential

carrier
on
the
620

series

has
a

gear
ratio
of
4
37S

The
drive

pinion
is

rnounted
in
two

tapered
roUer

bearings
which

are

pre

loaded

by
pinion

bearing
adjusting

spacer
and
washer

during
assembly

The
drive

pinion
is

positioned

by
a

washer
located

between
a
shoulder
of
ASSEMBl
Y

OF
DIFFERENT
Al

CASE

ADJUSTMENT

OF
DRIVE
PINION

HEIGHT

ADJUSTME
NT
OF
DRIVE

PINION

PRELOAD

t

ADJUST
ENT

OF
SIDE
8EARING

SHIMS

INSTAllATION

REPLACEME
NTOF
FRONT
Oil
SEAL

the
drive

pinion
and
the
rear

bearing

The
differential

case
is

supported
in

the
carrier

by
two

tapered
roller

side

bearings
These

are

preloaded

by
in

serting
shims
between

the

bearings
and

the
differential

case
The
differential

case

assembly
is

positioned
for

proper

ring
gear
and
drive

pinion
backlash

by

PO
5
PD
8

PD
9

PD
lO

PD
11

PD
13

PD
13

varying
these

shims
The

ring
gear
is

bolted
to
the

differential
case
The

case
houses
two
side

gears
in

mesh

with
two

pinion
mates

mounted
on
a

pinion
shaft
The

pinion
shaft
an

chored
in

the
case

by
lock

pin
The

pinion
mates
and
side

gears
are
backed

by
thrust
washers

The

carrier

is
of

malleable
cast
iron