1977 DATSUN PICK-UP oil pressure

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

Components

Rust

Discoloring
Race
and
roller

u

u

e

2

2
0

3

0

t
c

6
6
6

Fig
h

The
wheel

bearing
is
serv

iceable
if

discoloring
can

be

removed
with

solvent

or

by

polishing

f

a
Inner
race

flaking

t

d

Cracked
roller

iT

t
j

t

11
1

1
t

t

I
l

1
t

F
1ll

JJ
J

t
I

1

ollf

oe
c

g
Recess
on

foDer
Front
Axle
Front

Suspension

Cause

Temperature
increased

during
operation
lowers
when
the

bearing

stops
moisture

inside
the

bearing
is

condensed

becoming
fine

drips

and
the

grease
is

moistened

The

bearing
has
been

placed
in
a

highly
moistened

place
for
a

long

period
of
time

Intrusion
of
moisture
chemicals
etc
or

the

bearing
is

touched
with

bare
hand
and
no

rustproof
action
has

been
taken

Slight
discoloring

may
become
like

oxidized
oil
stain
due
to

grease

In
the

most
cases
this

occurs
when

preliminary

pressure
is
too

high

I
I

I

1

v

i
n

dJ

b
RoUer

flaking

c
Cracked
inner

race

c

f

J
Jt

v

l

e
Recess
on

inner
race

f
Recess

on
outer
race

h
Rust
outer
race

F
A007

Fig
FA
12

Defective
conditions

of
bearing

FA
7

Condition

Vehicle

puBes
to

right
or
left

Instability
of
vehicle

Stiff

steeirng
wheel

Excessive

steering
wheel

play

Noise
Front
Axle

Front

Suspension

Probable
cause

Deformed
of

steering

linkage
and

suspension
link

Unbalanced

vehicle
level

Improper
air

pressure
of
tire

Worn
or

loose

suspension
link
screw

bushing

Incorrect
wheel

alignment

Worn
or
deformed

steering

linkage
and

suspension

link

Incorrect

adjustment
of

steering
gear

Deformed
unbalanced
wheel

Check

and
correct
in
the

following
manner

Jack

up
front

wheels
detach
the

steering
gear
and

operate
the

steering
wheel
and

a

If
it
is

light
check

steering
linkage
and

suspension

groups

b
If
it
is

heavy
check

steering

gear
and

steering

column

groups

Improper
air

pressure
of
tire

Insufficient
lubricants
or

mixing
impurities
in

steering

linkage
or

excessively
worn

steering

linkage

Insufficient
lubricant
in

gear
box
or
contaminated

lubricant

Unsmooth

king
pin
damaged
part
Or
insufficient

lubrication

Worn

or

incorrectly
adjusted
wheel

bearing

Worn

damaged

steering
gear
and

bearing

Incorrectly
adjusted

steering
gear

Deformed

steering
linkage

Incorrect
wheel

alignment

Interference
of

steering
column
with
turn

signal

switch

Incorrectly
adjusted
steering
gear

Worn

steering
linkage
idler

arm

Improperly
fitted
of

gear
box

Incorrectly
adjusted
wheel

bearing

Worn
or
loose

suspension
link

screw
bushing

Improper
air

pressure
of
tire

Insufficient

lubricating
oil
and

grease
for

suspension

link
screw

bushing
and

steering
linkage
or
their

breakage

FA

15
Corrective
action

Replace

Correct

the
unbalance

Adjust

Replace

Adjust

Replace

Adjust

Correct

or

replace

Adjust

Replenish
grease
or

replace

the

part

Add

or

replace
gear
oil

Replace

Replace
or

adjust

Replace

Adjust

Replace

Adjust

Adjust

Adjust

Replace

Retighten

Adjust

Replace

Adjust

Replenish
lubricating
oil
and

grease
or

replace

Probable
cause

I
Air

leakago
at
check
valve

2
Air

leakage
a

t

push
rod
seal

3

Air
leakage
between
valve

body
and

seal

4
Air

leakage
at
valve

plunger
seat

5

Damaged
piping
or

joints

2
Fifteen

seconds
after

engine
is

stopped
and
brake

fully
applied
ob

serve
the

rate
of

drop
in
air

pressure

registered
by
vacuum

gauge

Probable
cause

1
Air

leakage
at
check
valve

2

Damaged
diaphragm

3
Reaction
disc

dropped
off

4
Air

leakage
at

and
valve
body
poppet
assembly
seat

Note
When

replacement
of

any
part

is

required
be
sure
to
renew

Master

Vac
as
an

assembly

Inspecting
check
valve

Remove

clip
and
disconnect
hoses

at
connections

The
check
valve

can

now
be
removed

yr

BA3

Fig
BR
26
Location

of
check
valve

2

Using
a
Master

Vac
tester

apply
a

vacuum

pressure
of

200

mmHg
7
87

inHg
to

the

port
of
check

valve
on
the

Master
Vac
side
If
a

pressure
drop
of

10

mmHg
0
39

inHg
is
exceeded
in
1

I

I

17
I

f
I

I
I

Z
I

I
y1
I

I
I
7
I
I
I

I
I
I

I
I
I

I

y1
II

I

I
I
I
I
I

I
L
I
L

5
to
15

20
25
30
35
40

45
50

55
60

22
44

66

88
110
132

Pedal

operating
force

kg
lb
BR772

Fig
BR
28

Performance
curves

of
Master
Vac
Brake

System

Corrective
action

Replace
check
valve

Replace
seal

Repair
or

replace
faulty

partes

Repair
or

replace
seat

Repair
or

replace

If
a

pressure
drop
of
25

mmHg

0

98

inHg
is

exceeded
refer
to

the

following
chart
to
determine
the
cause

of

failure

Corrective
action

Replace
check
valve

Replace

Reinstall
and
check

push
rod

for

proper
turn

Replace

faulty
part
s

15
seconds

replace
check
valve
with
a

new
one

3
When

pressure
is

applied
to
the

Master
Vac
side
of
check

valve
and

valve
does
not

open
replace
check

valve
with
a

new
one

120
I

7IG

110
1
560

100

I
420

i
90
1
280

I

u

80
1
140

70
1
000

II

60
850

0

0

5

a
50
710

40
570

30
430

20
280

10
140

BR
15
1

I

Manifold

side

Master

Yac
side

1

Spring
2

Valve

BA289

Fig
BR

27
Sectional
view

of
check

valve

Operating
test

1
Connect

an
oil

pressure
gauge
in

brake
line

at
connection
on
master

cylinder

2
Install
a

spring
scale
on
brake

pedal

3

Start

engine
and
increase

engine

speed
until

a
vacuum

pressure
of
500

mmHg
19
69

inHg
is

registered
on

vacuum

pressure

gauge
With
a

vacuum

pressure
of
500

mmHg
19
69

inHg

held

measure
an
oil

pressure
with

respect
to

each

pedal

operating
force

Relationship
between
oil

pressure

and

pedal

operating
force
is
illustrated

in

Figure
BR
28
If

test
results
are
not

as

specified
in

Figure
BR
28
check

Master
Vac
for
condition
in

a
manner

as
described
under

Inspection
before

removal
of
this
unit

Also
check
brake
line
for
evidence

of
fluid

leakage

Note
Determine
whether
malfunc

tion
occurs
in
Master
Vac
or
in

check
valve

Always
inspect
check

valve
fiTlit

Condition

Brake
chatters

Brake

squeals

Pedal

pulsates

Brakes
fade

Brakes

drag

Unbalanced
brakes
Brake

System

Probable
cause

Groove

or
out
of

round
brake
drum

Loose

or
bent

brake

disc

Distorted
brake
shoes

or

pads

Grease
or
brake
fluid
on

linings

Dirty
or
scored
brake

drums

Distorted
brake
shoes
or
bent

support
plate

Weak
or
broken
brake
shoe

retaining
spring

or

return

spring

Glazed
or
contaminated
brake

lining

Out
of

round
or
off
center
drum

Brake
fluid
has
too
low

boiling
point

Use
of

improper
linings
or
brake

linings
are

contaminated

Brake
drums
are
out
of
round

Hydraulic
connections
master

cylinder
and

wheel

cylinders
are

corroded
or

damaged

Bleed
screw
is

open

Pedal

linkage
is

binding
or

push
rod

adjust

ment
is
too

long

Master

cylinder
compensator
part
is
ob

structed

Seized
master

cylinder
piston

Poor
shoe
condition

Poor

wheel
cylinder
condition

Deformation
of

piston
cups

Hand
brake
will
not
return

Clogged
master

cylinder
return

port

Improper
tire
inflation

Improper
adjustment
of
shoe

to
drum
clear

anee

Grease
oil
mud
or
water
on

linings
or

pads

Mud
in

brake
drum

Deterioration
of

linings
or

pads

Excessive
wear
of

linings
or

pads

BR
23
Corrective
action

Grind
or

replace
as

required

Tighten

support
plate
bolts
to

specified

torque
or

replace
plate

Replace
as

necessary

Replace
linings

Blowout

assembly
with

compressed
air
or

refinish
drum

Replace
faulty
unit

Replace
if

faulty

Cam

ground
lining
to
eliminate

glaze
If

it

doesn
t

replace
linings

Turn

drum
or

replace
as
necessary

Drain
and
fill

system
with

approved
fluid

Replace
linings

Repair
or

replace
as
necessary

Repair
as
necessary

Close
screw
and
bleed

system

Lubricate

linkage
check

pedal
return

spring

for
condition
and

adjust
push
rod

as
neces

sary

Blowout

foreign
matter
with

compressed

air

Disassemble
master

cylinder
and

replace

piston
Bleed

system

Clean
and

repair

Repair
or

replace

Replace

Check
and

repair

Clean

Inflate
to
correct

pressure

Readjust

Clean
brake

mechanism
and
check
for
cause

of

problem
Replace
linings
or

pads

Clean

Replace

Replace

To

adjust
vertical
aim

use

adjusting

screw

on

upper
side

of

headlamp
and

to

adjust
horizontal
aim

use

adjusting

screw

on
side

of
head

lamp

Notes

Before

making
headlarnp
aiming
ad

justment
observe
the

foUowing
in

structions
Body
Electrical

System

a

Keep
aU

tires
inflated
to
correct

pressures

b
Place

vehicle
and
tester

on
the

same

flat
surface

c

See
that
there

is
no
load
in
vehicle

I
Gasoline
radiator
and

engine
oil

pan
filled

up
to

correct
levels

2
Without

passenger
When

performing
headlamp
aiming

adjustment
use
an

aiming
device

aiming
wall
screen
or

headlamp
tester

For

operating
instructions
of

any

aimer

refer
to

respective
operation

manuals

supplied
with
the
unit

DRIVING
BEAM
HIGH

BEAM

L

wt

H
G

hi
i

iiI

PASSING
BEAM
LOW
BEAM
10
m
32
8
ft

W2

H2
10
m

02
8
n

d

20

h2
I

02

I

I

f
10
m

32
8
ft

Driving
beam

High
beam

Passing
beam
Low

beam

HI

WI
01

mm
mm

CO

in
in

I
715
780

48

All
models

28
15
30

71
hI

H2
W2

h2

O2
d

mm
mm
mm

in

in
in
0

140

I
715

11
160

12018
5
51
28

15
45

67
mm
mm

in
in

392
349

is
43
13
74

BE302

Fig
BE
8

Aiming
adjustment

BE

6

Body
Electrical

System

METERS
AND

GAUGES

COMBINATION
METER

COMBINATION
METER
CIRCUIT

DIAGRAM

REMOVAL
AND

INSTALLATION

SPEEDOMETER

REMOVAL
AND

INSTALLATION

ODOMETER
SWITCH

REMOVAL
AND

INSTALLATION

FUEL
GAUGE
AND

WATER
TEMPERATURE

GAUGE

DESCRIPTION

REMOVAL
AND

INSTALLATION

OIL

PRESSURE
WARNING
LAMP

DESCRIPTION

01
L

PRESSURE
SWITCH

COMBINATION

METER

COMBINATION
METER

CIRCUIT
DIAGRAM

@

BE6828
CONTENTS

BE
14

BE
14

BE
16

BE
16

BE
16

BE
16

8E
16

BE
16

BE
16

BE
16

8E
17

BE
17

BE
17

Turn

signal

indicator

lamp

L
H

OIL

0

BEAM

BE
14
Meter
illumination

lamps

M
T

only

9

9
Turn

sq
nal

indicator

lamp

lL
J
R
H

Tj

O
iJ

I
l

g
r
i
o

I

l8

J
CHARGE

WARNING
LAMP

DESCRIPTION

HAND

BRAKE
WARNING
LAMP

DESCRIPTION

HAND
BRAKE

SWITCH

METER

ILLUMINATION

INDICATOR

AND

WARNING
BULBS

REMOVAL
AND

INSTALLATION

8ULB

SPECIFICATIONS

TROUBLE

DIAGNOSES
AND

CORRECTIONS

SPEEDOMETER

WATER
TEMPERATURE

AND
FUEL

GAUGES

OIL

PRESSURE
AND

CHARGE
WARNING

LAMPS

Voltage

regulator

TEMP

FUEL
CHG

0

BRK

C

I

Speedometer

2
Thermometer

3
Fuel
meter

4
Tachometer

Option

5

Cluster
lid

6

Speedometer
cable

7

Speed
switch

amplifier

Manual
transmission

only
BE
17

BE
17

BE
18

BE
18

8E
18

8E
18

BE
18

BE
18

BE
18

BE
18

BE
19

BE
20

Q
Speed

switch

BE856A

Fig
BE

21
Ci1
Cuit

diagram
of
combination

meter

Body
Electrical

System

Circuit

diagram
of
combination
meter

system

BATTERY

r
G
0

J

J

Z2

lIa

I

LlJ

I
Z

J

Z

a
z

J
z
Z

i

g

o
a

I
LlJ

I
ll

B

S

M

D

LIGHT

i
i
RELAY

i2i

mm

S

FROM

J

e
AMP

l1

l1

J
J

00

LlJLlJ

z
z

B

COO
CUT

n

SOLENOID

i

OIL

f
PRESSURE

SWITCH

THERMAL

a

TRANSMITTER

I
FUSIBLE

r
LINK
IGNITION
SWITCH

0
1
lOA

I

g

KG
lOA

r

I

15A

t

15A

i

7
5a

z

u

a
a
I

04LlJ

l1

J
o

02

u
3
FUEL
TANK

J

VOLTAGE

REGULATOR
HAND

BRAKE

SWITCH

J
Jon

0

j

Z

a

l

I
I

I
l

ll
Z

ll
Z

LlJ
LlJ

J
a
J
a

I
I

I
I

1

1

Zza
a

00

a
a

LlJLlJ

ll
ll
a
a
HAZARD

FLASHER

UNIT

L
J

HAZAR

D

SWITCH

I
OFF

ONI

l
I

I

I
2

I

I
3

I

14

61
I
5
6

16

9
I

76

I

FLASHER

UNIT

CJ

TO
LIGHT
IOFF

RELAY

B
l

TERMINAL

I

I

I

LIGHT

SWITCH
21

X
X

BEB57
A

Fig
BE
22
Circuit

diagram
of
combination

meter

ayatt
m
TURN

SIGNAL

SWITCH

I
L

RI

lFLA
I

IR
R

I

IR
L

I

IF
R
u

I

IF
L

u

I

FROM
L1GHT

RELAY
DIMMER

SWITCH

BE

15