brake DATSUN 210 1979 User Guide

REMOVAL

It
is
much
easier

to
remove

engine

and
transmission

as
a
single
unit
than

to

remove
alone
After
removal

engine

can
be

separated
from
the
transmission

assembly

WARNING

a
Place
wheel
chocks
in
fronl

of

front

wheels
and
in

rear
of

rear

wheels

b
Be
sure
to
hoist

engine
in
a
safe

manner

c
You
should
not
remove

engine

until
exhaust

system
has
com

pletely
cooled
off

Otherwise

you
may
burn

your

self
and
or
fire

may
break

out
in

fuel
line

Note
Fender
coven
should
be

used

to

protect
car

body

1
Disconnect

battery
ground
cable

from

battery
terminal
and
fusible
link

at
wire

connector

2
Remove
hood

as
follows

CAUTION

Have
an
assistant

help
you
so
as
to

prevent

damage
to

body

I
Mark
hood

hinge
locations
on

hood
to
facilitate
reinstallation

2

Support
hood

by
ltand
and
re

move
bolts

securing
it

to
hood

hinge

being
careful
not
to
let
hood

slip
when

bolts
are

removed
See

Fig
ER
2

3
Remove
hood
from
hood

hinge

f

Il

I

BF133A

Fig
ER
2

Removing
Hood

Remove

under
cover

Drain

radiator
coolant
and

engine
3

4

oil

5

Disconnect

upper
and
lower
hoses

from
radiator
and
disconnect
oil

cooler
hoses
automatic
transmission

only

6
Remove
four
bolts

securing
radia
Engine
Removal
Installation

tor

to

body
and
detach
radiator
after

removing
radiator
shroud

7

Remove
air
cleaner

assembly

from
carburetor
as
follows

1
Remove

fresh
air
duct
from
air

cleaner

2
Remove
hot
air
duct
from
air

cleaner

3

Loosen
air
cleaner
band
bolt

4
Disconnect
air

cleaner
to
air

pump
hose

at
air
cleaner

5

Disconnect
air
cleaner

ta
rocker

cover
hose

at
rocker
cover

6
Disconnect
air

cleaner
to
A
B

valve
hose
at
air

cleaner

7
Disconnect
air
cleaner
to
related

vacuum
hoses
at
air

cleaner

8
Disconnect
accelerator
control

wire
from
carburetor

9
Disconnect

the

following
cables

wires

and
hoses

Wire

to
auto
choke
heater

Wire
to

throttle

opener
cut
solenoid

or

throttle
switch

Wire

to
fuel
cut
solenoid

Wire
to

vacuum
switching
valve

High
tension

cable
between

igni

tion
coil
and
distributor

Battery
cable
to
starter
motor

Wire
to
distributor

Wire

to
thermal
transmitter

Wire

to
alternator

Engine
ground
cable
oil

pressure

switch
and

engine
harness
No
2

See

Fig
ER
3

o

1
Ground
cable

2

Engine
harness
No

2

3
Oil

pressure
switch

Fig
ER

3
EA368

Disconnecting
Cable
and

Wire

Fuel
hose

at
fuel

pump
and
fuel

return

hose
at
connection

Air

pump
air

cleaner
hose

Carbon
canister
hoses

Heater
inlet
and
outlet
hoses
if

so

equipped

ER
3
Vacuum
hose
of

brake
booster
at

intake
manifold

Air
conditioner

equipped

model

10
Remove

compressor
belt

To

remove
loosen
idler

pulley
nut

and

adjusting
bolt

1
Remove
air

pump

2
Remove

compressor
retaining

bolts
and
move

compressor
toward

fender
to
facilitate
removal
of

engine

Nole
Never

discharge
gas
from
com

pressor
while
work
is

being

per

formed

II

Compressor

EA478

Fig
ER
4

Location

of
Air

Compressor

3
Disconnect
vacuum
hose
of
air

conditioner
from
connector
of
intake

manifold

4
Remove

F
i

C
D

actuator
from

bracket

II
Remove
clutch

operating
cylin

der
from
clutch

housing
manual
trans

mission

only

dJ

Tightening
torque

Clutch

operating
cylinder

E
A3

to
clutch

housing

3
1

to
4
1

kg

22
to

30
ft
lbl

Fig
ER
5

Removing
Clutch

Operating

Cylinder

CLUTCH
PEDAL

HEIGHT

I

Adjust
clutch

pedal
height
H
to

the

specified
range
with

pedal
stopper

adjusting
nut
Then

tighten
lock
nut

CD

2

Adjust
clutch

pedal
free

play
A

to
the

specified
range
at

pedal

pad

with
clutch
master

cylinder
push
rod

Then

tighten
lock
nut

@

Note

a

Pedal
free

play

appeared
due
to

clearance

among
pedal
hole

push

rod
and

piston
should
be

measured

on

top
face
of

pedal
pad

b

Depress
and
release
clutch

pedal

over
its
entire
stroke
to
ensure
that

the
clutch

linkage

operates
smooth

ly
without

squeak
noise

inter

ference
and

binding

I

I

Lock
nut

2

Lock
nut

Cl325

Fig
CL
I

AdjlUting
Clutch

Pedal

Height

Pedal

height
H

143

to
149

mm
5

63
to
5
87
in

Pedal
free

play
An

1

to
5
mm

0
04

to
0

20
in
Clutch

ADJUSTMENT

tfl
Tightening
torque

Lock
nut

CD

0
8

to
1
2

kg
m

5
8
to
8
7

ft
Ib

Lock
nut

@

0
8
to
1

Icll
m

5
8
to
8
7
ft

lbl

CLUTCH
PEDAL

FREE
TRAVEL

Adjust
clutch

pedal
free
travel

whenever
clutch
does
not

disengage

properly
or
whenever
new

clutch

parts
are

i
lslalled

I
Loosen
lock

nut
and

push
nut

djust
length
of

push
rod

by
turning

p
lsh
rod
with

open
end
wrench

until

release

bearing
lightly
touches
clutch

dia

phragm

spring

2

Then
turn

push
rod
back

approxi

mately
I

4
turns
so
that
withdrawal

lever

play
B

clearance
between

withdrawal
lever

push
nut
and
with

drawal
lever

is
within
the

specified

range

V

@

1
B

I

Lock

nut

2
Push
nut

3

Withdrawallcver

CL327

Fig
CL

2

AdjlUting
Clutch

Pedal

Free

Trauel

3

Tighten
lock
nut

against
push

nut

being
careful
not
to
disturb
the

adjustment

4

Depress
and
release
clutch

pedal

several
times

then
recheck

with

drawal

lever

play
B

Readjust
if

necessary

5

Finally
measure

pedal
free
travel

C
at
center
of

pedal
pad

CL
2
Withdrawalle

er
play
nBn

clearance
between
withdrawal

I
er

push
nut
and
withdrawal

le
erl

1
0

to
2
0

mm

0

039
to

0
079
in

Clutch

pedal
free

tr
el
en

at
center
of

pedal
pad

16to33
mm

0
63
to
1
30
in

BLEEDING
CLUTCH

SYSTEM

The

hydraulic
clutch

system
must

be
bled
whenever

clutch
line
has
been

disconnected
or
air
has
entered
it

When

pedal
action
has
a

spongy

feeling
it
is
an
indication
that
air
has

entered
the

system

Bleeding
clutch

system
is

an
essen

tial

part
of

regular
clutch
service

I
Remove

cap
of
reservoir
and

top

up
with
recommended
brake
fluid

2

Thoroughly
clean
mud
and
dust

from
bleeder
screw
of

operating
cyl

inder

so
that
outlet
hole

is
free
from

any

foreign
material
Install
bleeder

hose

vinyl
hose
on
bleeder
screw

Place
the
other
end
of
it
in

a

container

filled
with
brake
fluid

3
Have

a
co
worker

depress
clutch

pedal
two
or

three
times

With
clutch

pedal
depressed
fully
loosen
bleeder

screw

to
bleed
air
out
of
clutch

sys

tem

4
Close
bleeder

screw
quickly
as

clutch

pedal
is
on
down
stroke

5
Allow
clutch

pedal
to
return

slowly
with
bleeder

screw
closed

6

Repeat
steps
3

through
5
until
no

air

bubble
shows
in

the

vinyl
hose

tfl

Tightening
torque

Bleeder
screw

0
7

to
0
9

kg
m

5
1

to
6
5
ft

lbl

7

Depress
and
release

clutch

pedal

several
times
then

check
for

external

hydraulic
leaks
at

connections

Note

a
Brake
fluid

conlaining
air
is

white

and
has

visible
air
bubbles

b

Brake
fluid

containing
no
air

runs

out

of
bleeder
screw
in
a
1lO6d

stream
without
air

bubbles

c

Pay
close
attention
to

clutch
fluid

level

in
reservoir

during
bleeding

operation
Clutch

d

Pour
brake
fluid
into

reServoir

up

to

the

specified
level

CLUTCH
CONTROL

Clutch
ma5ter
cylinder

2

Clutch
disc

assembly

3
Clutch
cover

assembly

4

Release

bearing
and
sleeve

assembly

5

Return

spring

6
Clutch
line

7

Clutch

pedal

8

Operating
cylinder

9
Withdrawal
lever

10
Withdrawal
lever
ball

pin
CAUTION

a
00
not

re
use
brake
fluid

drained

during

bleeding
operation

b

Exercise
care
not
to

splash
brake

fluid
on
exterior
finish
as
it
will

damage
the

paint

e
When

tightening
flare
nut
use
Flal
ll

Nut

Torque
Wrench

GG94310000

CLUTCH
PEDAL

REMOVAL

l

JF

j

1

Clevis

pin

2
Master

cylinder

push
rod

3

Snap
pin

4

E

ring

5

Bushfug

6
autch

pedal

7

Return

spring

j
CL351

Fig
CL
4

Clutch
Pedal

C
L369

Fig
CL

3

Hydraulic
Clutch

Control

System

CL
3
I

Remove

snap
pin
from

end
of

clevis

pin
Separate
master

cylinder

push
rod
from
clutch

pedal

2

Remove
E

ring
from

tip
of
ful

crum

pin
and

take

out
clutch

pedal

and
return

spring

INSPEctiON

Check
clutch

pedal
parts
for
the

following
items

correcting
neces

sary

I
Bent

pedal

2

Weakened
return

spring

3
Worn

or
deformed
clevis

pin
and

fulcrum

bwhings

4

Cracks
at
welded

part

INSTAl1
ATION

To
install
clutch

pedal
reverse
the

order
of
removal
Observe
the
follow

ing

I

Apply

coating
of
recommended

multi

purpose
grease
to

sliding
por

tions
and
return

spring

Lt
of

I

ii

CL352

Fig
CL
5

Lubricating
Point

2
Fit
return

spring
in
hole
in

pedal

bracket
and

securely
fit
E

ring
in
slit

of
fulcrum

pin

3
Insert

clevis

pin
through
clutch

pedal
from
left

to

right
side

4

After

installing
clutch

pedal

check
the

clutch

pedal
height

AdjUst

if

necessary
Refer
to

Adjwtment

CLUTCH

MASTER

CYLINDER

REMOVAL

I
Remove

snap
pin
from

clevis

pin

2
Pull

out
clevis

pin

3
Disconnect
clutch
tube
from
mas

ter

cylinder

4

Remove
master

cylinder
Clutch

CAUTION

When

disconnecting
clutch
tube
use

suitable
flare
nut
wrench

Never
use
an

open
end
wrench
or

adjus1able
wrench

DISASSEMBLY
Note
When

disconnecting
dutch

tube
be
sure
to
receive

draioillll

clutch
fluid
into

a
container
Use
of

rags
is
also

suggested
to

keep

adja

cent

parts
and
area

clean

@

@

1
Reservoir
cap
6

Return

prina
11

Primary
cup
16

StOppel
rins

2
Reservoir
7

Sprina
seat
12
Piston
17
Dust
cover

3
Rescrvou
band

8
Valve

sprina
3

Secondary
cup
18
Lock
nut

4

Cylinder
body
9

Supply
valve
rod

14
Push
rod

5

Supply
yalYe
stopper
10

Supply
valve

15

Stopper

CL345

Fig
CL
6
Clutch
Mcuter

Cylind
r

I
Remove
dwt
cover
and
take
off

stopper
ring
from

body

2
Then
the

push
rod
and

stopper

can
be
taken
out

3

Loosen

supply
valve

stopper
and

take
it

out

4
The

piston
spring
seat
and
reo

turn

spring
can
be
taken
out

Note
Discard

piston
cup
and
dust

cover

CAUTION

Never
detach
reservoir
If

it
is
removed

for

any
reason

discard
it
and
instill

new
one

CL
4
INSPECTION

CAUTION

To
clean
or
wash
all

parts
of
masler

cylinder
clean
brake
fluid
must
be

used
Never
use
mineral
oils
such

as

gasoline
and
kerosene
It
will
ruin
tha

rubber

parts
of
tha

hydraulic
syslBm

I
Check

cylinder
bore
and

piston

for
score
or
rust
and
if
found

replace

2
Check

cylinder
bore

and

piston

for
wear
If
the

clearance
between

cylinder
bore
and

piston
exceeds
the

specified
value

replace
piston
assem

bly
or
master

cylinder
assembly

3

Check
the
condition
of

piston

cup
and
dust
cover

Always

replace

them
after

disassembly

4
Check

all
recesses

openings
and

internal

passages
to

ensure
that

they

are

clean
and
free
from

foreign
matter

Cearance
between

cylinder

bore
and

piston

Leu
than
0
15

mm

0
0059
in

ASSEMBLY

Assemble
clutch
master

cylinder
in

the
reverse
order
of

disassembly
Ob

serve
the
following

I

Dip
piston
cup
in
brake

fluid

before

installing
Make
sure
that

it
is

correctly
faced
in

position

1
Return

spring

2

Supply
valve
rod

3
Piston

4

Secondary

cup
5

Spring
seat

6
Valve

spring

7

Primary
cup

8
Push
rod

CL283

Fig
CL
7
Piston

Asaembly

2

Apply
a

coating
of
brake
fluid
to

cylinder
and

piston
when

assembling

if
Tightening
torque

Reservoir
band

0
25
to
0
4

kg
m

11
8
to
2
9
ft
lb

Supply
valve

stopper

0
15
to
0
3

kg
m

1
1
to
2
2
ft
Ib

INSTALLATION

Install
clutch
master

cylinder
in
the

reverse
order
of
removal
Observe
the

following

I

Bleed
air

out
of

hydraulic
system

Refer
to

Bleeding
Clutch

System
for

bleeding

2

Adjust
pedal
height
and

pedal

free

travel
Refer
to

Clutch
Pedal

Height
and
Clutch
Pedal
Free

Travel

for

adjustment
Clutch

if
Tightening
torque

Master

cylinder
to
dash

panel

securing
nut

0
8
to
1
2

kg
m

5
8
to
8
7
ft

Ib

Clutch
tube
flare
nut

1
5
to
1
8

kg
m

11

to
13
ft
lb

CAUTION

When

connecting
clutch
tube

use

F

lere
Nut

Torque
Wrench

GG94310000

Note
When

tightening
flare
nut
hold

pipe
by
hand
to

r
it

from

twilling

OPERATING

CYLINDER

REMOVAL

I
Disconnect
clutch
tube
from

clutch
hose
at
the

bracket
on

side

member

CAUTION

When

disconnecting
clutch
tube

use

suitable
flare
nut
wrench

Never
use
an

open
end
wrench
or

adjustable
wrench

2
Remove
lock

spring
then
dis

engage
hose
from
bracket

3
Remove
clutch
hose
from

oper

ating
cylinder

4
Remove

operating
cylinder

DISASSEMBLY

Remove

push
rod
and
dust

cover

2

Remove

piston
and

piston
cup
as

an

assembly

Note

Discard

piston
cup
and
dust

cover

3
Remove
bleeder
screw

Cl
5
1

4

v

I
Bleeder
screw

2

Cylinder
body

3
Piston

cup

4
Piston
5
Dust
cover

6
Push
rod

7
Lock
nut

8

Push
nut

CL203

Fig
CL
B

Operating
Cylinder

INSPECTION

Visually

inspect
all
disassembled

parts
and

replace

parts
which
are
worn

or

damaged
too

badly

beyond
specifi

cations

CAUTION

To
clean
or
WISh
all

parts
of

operating

cylinder
dean
brake
fluid
must
be

Used

Never

use
mineral
oils
such
as

gasoline

and
kerosene
It
will
ruin
the
rubber

parts
of
the

hydraulic
system

I

Check

cylinder
bore
and

piston

for
score
or
rust
and
if
found

replace

2
Check

cylinder
bore
and

piston

for
wear
If
clearance

between

cylinder

bore
and

piston
i5
more

than
the

specified
value

replace
piston
or

oper

ating
cylinder
assembly

3

Check
condition
of

piston

cup

and
dust
cover

Always

replace
them

after

disassembly

4
Check
bleeder
hole
to

be
sure

that
it
is

clean

Clearance
between

cyliniler
bore

and

piston

less
than
0
15
mm
0
0059
in

ASSEMBLY

Assemble

operating
cylinder
in

the

reverse
order
of

disassembly
Observe

the

following

t

Prior
to

lWembly

dip
a
new

piston
cup
in
clean

brake
fluid
To

install

piston
cup
on

piston
pay
par

ticular
auention
to
its

direction

2

Dip
cylinder
and

piston
in

clean

brake

fluid
before

assembly

INSTALLATION

Install

operating
cylinder
in
the

reverse
order
of

removal
Observe

the

following

1

Bleed
air

thoroughly
from
clutch

hydraulic
system
Refer
to

Bleeding

Clutch

System
for

bleeding

2

Adjust
clutch

pedal
free
travel

Refer
to

Clutch
Pedal
Free

Travel
for

adjustment

Note

a

Use
new

gasket

b
When

operating
cylinder
is
removed

from
or

instaUed
on
clutch
haus

ing
without

disconnecting
clutch

hose
from

operating
cylinder
loos

en
bleeder

screw
so
that

push
rod

mo

lightly

c
E
xer

e

care
not
to

p
or
wist

clutch
hose
Be

sure
to
install

clutch
hose

away
from

exhaust

tube

d
When

tightening
flare

nut
hold

pipe
by
hand
to

prevent
it
from

twisting

CAUTION

When

connecting
dutch
tuhe

uSe

Flare

Nut

Torque
Wrench

G694310000

@
Tightening
torque

Bleeder

screw

0
7
to
0
9

kg
m

5
1
to
6
5
ft
Ihl
Clutch

o

cylinder
to
clutch

housing
securing
bolts

3
1
to
4
1

kg
m

22
to
30
ft
lbl

Clutch
hose
to

operating

cyli
nder

1
7
to
2
0

kg
m

12
to
14
ft

lbl

Flare
nut

1
5
to
1
8

kg
m

11
to
13
ft
Ibl

CLUTCH
LINE

INSPECTION

Check
clutch
lines
tube

and
hose

for
evidence
of
cracks
deterioration
or

other

damage

Replace
if

necessary

If

leakage
occurs
at
or

around

joints
retighten
and
if

necessary
re

place
damaged

parts

REMOVAL

CAUTION

When

disconnecting
clutch
tube

use

suitable
flare

nut
wrench

Never

use
an

open
end
wrench
or

adjustable
wrench

1

Qisconnect
clutch
tube
from

clutch

hose
at
bracket
on
side
mem

ber

2
emove
lock

spring
then
disen

gage
hose
from
bracket

3

Remove
clutch
hose
from

oper

ating
cylinder

4

Disconnect
clutch
tube
from
mas

ter

cylinder

5

Remove

clamp
fIxing
clutch
tube

to
dash

panel
and
side

member

CL
6
INSTALLAnOlll

Wipe
the

opening
ends
of

hydraulic

line

to
remove

any
foreign
matter

before

malting
connections

I
Connect
clutch
tuhe
to

master

cylinder
with
flare
nut

2
Fix
clutch
tube
to
dash

panel

and
side

member
with

clamp

3
Then

tighten
flare

nut

@

Tightening
torque

Flar
nut

1
5
to
1
8

kg
m

11
to

13
ft

Ibl

2
InstaU
clutch
hose
on

operating

cylinder
with
a

gasket
in

place

Note

Use
new

gaslcet

@
Tightening
torque

1
7
to
2
0

kg
m

12
to
14ft
lbl

3

Engage
opposite
end
of

hose
with

bracket
InstaU
lock

spring
fIxing
hose

to
bracket

Note

a
When

tightening
flare

nut
hold

pipe
by
hand
to

prevent
it
from

twisting

b
Exercise
care
not
to

warp
or
twist

clu1ch
hose

4

Connect
clutch
tube
to

hose
with

flare
nut
and

tighten
it

5
Check
distance

between
clutch

line
and

adjacent
parts

especially
be

tween
hose
and
exhaust
tube

6

Bleed
air
out
of

hydraulic
system

Refer
to

Bleeding
Clutch

System

for

bleeding

CAUTION

When

tightening
flare

nut
use

Flare

Nut
Wrench

G
G9431
0000

The
3N71
B
trammission
is
a

fully

automatic
unit

consisting
primarily
of

a
3
element

hydraulic
torque
converter

and
two

planetary
gear
sets
Two

multiple
disc
c1utclies
a

multiple
disc

brake
brake

band
and
one

way
clutch

provide
the

friction
elements

necessary

to
obtain

the
desired
function
of
the

two

planetary
gear
ets

A

hydraulic
control

system
is

used

to

operate
the
friction
elements
and

automatic
shift
controls

TORQUE
CONVERTER

The

torque
converter
is

attached
to

the
crankshaft

through
a
flexible
drive

plate
Heat

generat
in
the

t
rque

converter
is

dissipated
by
circulating

the
transmission
fluid

through
an
oil

to

water

type
cooler
in

the
radiator

lower
tank

The

welded
comtruction

of
the

torque
co
verter

prevents
di
3

ssembly

or
service
unless

highly

specialized

equipment
is
available

Qj
gJ
Autpmatic
Trimsmissi6n

DEScRIPTION

FLUID

RECOMMENDAnON

Use
DEXRON

type
automatic

transmission
fluid

only

IDENTIFICATION
NUMBER

Stamped
position

The

plate
is

attached
to
the

right

han
side
of
transmission

case

AT
M

Fig
AT
l

Identification
Number
Identification
of
number

arranaemanta

JAPAJllUTOIlATlC
TRAJISIIISSIO

C8
Ull

MODEL
X
0
12
3

NO
7
6
0

1
2

34

Number

designation

76
0
I
2

34

L

Serial
productioo

number

for
the
month

Month
of

production

1
Jan

2
Feb

X

Oct
Y

Nov
Z

Dec

Lut

IJgUre
denotins

the
year
A

D

IJ

III

J

W

f

r
lrr

G

1

Transmission
case

2
Oil

pump

3
Front
clutch

4

Band
brake

5
Rear
dutch

6
Front

planetary
geat

7
Rear

planetary
gear
8
One
way
clutch

9
Low
4
Reverse
brake

10
Oil
distributor

11
Governor

12

utput
shaft

13
Rear
extension
14
Oil

pan

IS
Control
valve

16

Input
shaft

17

Torque
converter

18
Converter

housi

19

Drive

pia
te
Tightening

torque
T
of

bolts
and
nuts

kg
m
ft
lb

@
T
4

to
5
29
to
36

@
T

14
to
16
101

to
116

@
T
4

5

to
5
5

33
to
40

@
T

0
6
to
0
8
4

3
to
5

8

@

T
0
5
to
0
7

3
6
to

5
1

T
2

0
to
2
5

14
to
18

@
T

1
3
to
1

8
9

to
13

@
T

0
55
ta
0
75
4
0
to
5
4

CD
T

0
25
to
0
35
1
8
to
2
5

AT312

Fig
AT
2
3N71B

Automatic
Trammiuion

AT
2

Automatic
Transmission

HYDRAULIC
CONTROL
UNIT
AND

VALVES

The

hydraulic
or
a
tomatic
control

system
is

comprised
of
four
4
basic

groups
the

pressure
supply
system

the

pressure
regulating
system
the

flow
control
valves
and
the
friction

elements

PRESSURE
SUPPLY
SYSTEM

The

pressure
supply
system
consists

of

a

gear

type
oil

pwnp
driven

by
the

engine
through
the

torque
converter

The

pump
provides

pressure
for
aU

hydraulic
and
lubrication
needs

PRESSURE
REGULATOR

VALVES

The

pressure
regulating
valves
con

trol
the

output
pressure
of
the
oil

pump

Pre
ure

rellulator
valve

The

pressure
regulator
valve
con

trois
mainline

pressure
based
on

throttle

opening
for
the

operation
of

the
band
clutches
and

brake

Governor

valve

The

governor
valve
transmits

re

gulated
pressure
based
on
car

peed

to
the

shift
valves
to
control

upshifts

and
downshifts

Vacuum
throttle
valve

The
vacuum

throttle
valve
transmits

regulated
pressure
based
on

engine

load
vacuum
This

pressure
controls

the

pressure
regulator
valve

Also
this

pressure
is

applied
to
one
end
of
the

shift
valves
in

opposition
to

governor

pressure
which
acts

on
the
other

end

of
the
shift
valves

controlling

upshift

and
downshift

speeds
FLOW
CONTROL
VALVES

Manual
valve

The
manual
valve
is
moved

manual

Iy
by
the
car

operator
to
select
the

different
drive

ranges

1
2
ShHt
valve

The
1
2

shift
valve

automaticaIly

shifts
the
transmission
from
first

to

second
or
from
second
to
first

depend

ing

upon
governor
and
throttle

pres

sure

along
with

accelerator

position

solenoid
downshift
valve
See

Hy

draulic
Control
Circuits
Drive

2

2
3
ShHt
valve

The
2
3
shift
valve

automaticaIly

shifts
the
transmission
from
second
to

top
gear
or
from

top
to
second
de

pending

upon
governor
and
throttle

pressure
or
accelerator

position
sole

noid
downshift
valve

See
Hydraulic

Control
Circuits
Drive
3

Range

2
3

Tlmlnll
valve

For
2
3
shifts
a
restrictive
orifice

slows
the

application
fluid
to
the
front

clutch
while
the

slower

reacting
band

is
allowed
to
release
This

prevents
a

hard
2
3
or
3
2
shift
Under

heavy

load
however
the

engine
will
tend
to

run

away
during
the
2
3

or
3
2
shift

pause
therefore
a
2
3

timing
valve

using
throttle
and

governor

pressure
is

used
to

bypass
the

restrictive
orifice

during
such

heavy
load
conditions

Solenoid
down
hHt
valve

The
solenoid
downshift
valve
is

activated

electrically
when
the
ac

celerator
is
f1oor
d

causing
a
forced

downshift
from

top
to
second

top
to

first
or

second
to

first

gear
depending

upon
car

speed
governor

pressure

AT
3
Pre
ure
modified
valve

The

pressure
modifier

valve
assists

the
mainline

pressure

regulator
valve
in

lowering
mainline

pressure
during

high

speed

light
load
conditions
such
as

steady

speed
cruise

Governor

pres

sure

working

against
a

spring

opens

the

valve
which
aUows

modified
throt

tle

pressure
to
work

against
the

pres

sure

regulator
valve

spring
lowering

mainline

pressure
Lower

operating

pressure
under

light
load

reduces
oil

temperature
and
increases
transmis

sian
life

Throttle
back
up
valve

The
throttle

back

up
valve
assists

the
vacuum
throttle
valve
to

increase

line

pressure
when
the
manual
valve
is

shifted

either
to

2
or
I

range

Second
lock
valve

The

second
lock
valve
is

used
to

bypa
the
1
2

shift
valve

to
maintain

the
band

apply

pressure
in
2

posi

tion
The
valve
is
also
used
as
an
oil

passage
for
the
1
2

shift
valve

band

apply

pressure
in

D2

D3
and

12
Range

CLUTCHES
AND
BAND

SERVOS

The

servo

pistons
of
the
clutches

low

reverse
brake
and

band
are
moved

hydraulically
to

engage
the

clutches

brake
and

apply
the
band
The
clutch

and

brake
istons

are
released

by

spring
tension

and
band

piston
is

released

by
spring
tension

and

hy

draulic

pressure

OIL
CHANNEL

IDENTIFICATION

The
circuit
numbers
shown
in
each

Hydraulic
Control
Circuit
are

classified

as
follows
according
to
the

function

Pressure
source
of
the
line
7

Operating
line

pressure
for

friction
elements

I
2
3
4
5
6

g
9

10
11
12

Auxiliary
line

pressure
13

Torque
converter

pressure
14

Governor

pressure
15

Throttle

system
pressure

16
17
18

19

Oil
pump
discharge
hole
7

f
Torque
converter

pressure
14

Rear
clutch

pressure
1

Front
clutch

pressure
11

W
h0i1
pu
6
suction
hote

e

8

IIlIlJJIII
Automatic
Transmission

L

f

AT106

Fig
AT
5

Oil
Channela
in
Cou
Front
Face

lo
o

o
0

Oil

pump
discharge
hole
7
Governor

pressure
15

1

h

Torque
converter
I

pressure
14
0
0

Servo
release

Rear
clutch

l
press
re

10
r

L

Governor
reed

pressure
1

pressure
1
Servo

tlghtemng

li
nb

o

0

pressure
9

r

Front

clutch
fI
Low
reverse
brake

pressure
12

pressure
11

U
0

111
1

1
P
u
n

e

AT107

ATlOS

Fig
A
T
4

Oil
Channell
in
Oil
Pump
Fig
A
T
6
Oil
Channell
in
Cou
Fac

MECHANICAL
OPERATION

In

the
3N71B
automatic
transmis

sion
each

part
operates
as
shown
in

the

following
table
at
each
gear
select

position
RanKe
Cm

ratio
Clutch
Low
A

Front
Rear

brake
One

w

y

dutch
Parkin

pa
l
Band
servo

Operation
Release

Park
on
on

Reftrst
2
182
on

on
on

Neutral

Dl
Lo
2
458
on

on

Drift
02
Second
1
458
on

03

Top
1
000
on
on
on

2
Second
1
4
8
on
on

12
Second
1458
on
on

Low
2
4
8
on
on

Note
The
low
brake
is

applied
in

11
raiW
to

prevent
free
whee6ng

when
coasting
and
aIlows
engine

braking

AT
5

Automatic

Transmission

HYDRAULIC
CONTROL
CIRCUITS

P
RANGE
PARK

Po
r
flow

In

P

range
the
shift

linkage

actuated

parking
pawl
meshes
in
a

gear

splined
to
the

output
shaft

preventing

movement
of
the

car
When
the

engine

is

running
the
low

and
reverse
brake
is

applied
by
pressure
from
the
manual

valve

passing
through
the
1
2
shift

valve
Free
Lock

II

AT086

Fig
AT
7

Parking
M
haniml

FI
1d
flow

Manual
Valve
4
Downshift
Valve
13
2nd

3rd
Shift
Valve

L

1st
2nd
Shift
Valve

Throttle

Back

up
Valve

5
1st
2nd

Shift
Valve
12

I
Throttle
Back

up
Valve

Y
Low
Reverse
Brake

I

AT
6