1969 DATSUN B110 Service Repair Manual

Transmission

Worn

gears
shaft
and
or

heanng
Repl
ll
c

In
ufficlcnt

operatmg
stroke
due
to
worn
or
loose

shdmg

pdll
Repair
or

replal
c

Defective
or

damaged

synchronIzer
Replace

Gear

slips
out

of
mesh

In
the
most
cases
thiS
trouble
occurs
when
the
Interlock

plunger
check
ball
and
or

spnng
IS
worn
or
weakened
or

when
the
control

system
IS
defectIve
In
thiS
Cd
the
trouble
cannot
be

corrected

by
repldtlllg
gt
drs

and
therefore

trouble
shootmg
must
be

earned
out

carefully
It
should
also
be
noted
that

gear
slips
out
of
mesh
due
to
vlbralIon

generated
by
weakened
front
and
rear

engme
mounts

Worn
mterlock

plunger
Replal
c

Worn
check
hall
and
or

weakened
or
broken

sprmg
Replal
c

Worn
fork
rod
ball

groove
RepI

H
e

Worn
or

damaged
beanng
Repldce

Worn
or

damaged
gear
Repldl
c

NOise

When
nOIse

occurs
unoer
engine
Idling
and

stops
whde
the
clutch
IS

dlseng
lged
or
when
nOI
Olcurs
while

shlftmg

gears
It

may

Judged
that
the
nOIse

IS
from
the
tranSmll
lSIUn

Ino

ufllclenl
or

1mproper
lubncant
Add
od
or

replace
With

deSignated

oIl

Ollleaklllg
due
to
defectIve
011
seal
md

gasket
clogged
breather
etc
Clean
or

replace

Worn
beanng

High
hummmg
occurs
at
a

high
speed
Replace

Damaged
beanng
Cychc
knockmg
sound
occurs
alllo
at
a
low

speed
Replace

Worn
each

sphne
Replace

Worn
each

hushmg
Replace

108

Transmission

AUTOMATIC
TRANSMISSION
DESCRIPTION

I
Ii
9
0
@
@

AT270

1
U
lllll

II
O
l

rn
lr
II

hkl1lllj
ItlrllUl
I
II

01
15
tu
07

011

pump
12

OUllJllt
holtl
h
llt
Ih

kl
Illllt
Ihl
16
to

i
II

1
1
runl
dUlth
13
Kl

JT
llhlOIl

01
10

01
20
to
2
5

4
B
H1d
brJkl
14
011

p
Jll
l
i
H
hl
7
14toHn

5
Re
u

du
h
15
lIT01
tlvt
@
41u5

@I
I
310
I
8

6
I
ronl

plJllctJry
lJr
16

Input
11
111

0
29101fll
194
013

1
Rldr

pIJIJC
IJ

ry
j
l
Lr
11
1
m

lu
n

lIh
T
6
5
tn
15

@
055toO
5

OIll
JYdutdt
rllT

11
l1
11l

@I
147
to

541
40
0
5
4

9
I
lW
RlVlr
l

bl
Jkl
19
Dm
l

plJh
16
III
8

CDT
l
2S
to

U
l

S

10
011
dl
nbulm
4

11n
i

HI

I
I
to
2

iJ

Flg
161
Cross
sectIonal
view

of
3N71B
automatic
transmIssIon

107

Transmission

AUTOMATIC
TRANSMISSION

The
model
3N71B

automatic
transmiSSIOn
IS

a

fully
automatic
Unit

consisting

pnmanly
of

3
element

hydrauhc
torque
converter
and
two

planetary
gear
sets
Two

multiple
disc
clut

ches
a

multiple
disc

brake
a
band

brake
and

a
one

way

sprag
clutch

provide
the
fnctlon

elements

reqUired
to
obtain
the
deSired

fun

tlon
of

the
two

planetary
gear
sets

The
two

planetary
gear
sets

give
three
for

ward

ratIOs
and
one
reverse

Changing
of
the

gear
ratIOs
IS

fully
automatic

In
relation
to

vehicle

speed
and

engine
torque
Input

Vehicle

speed
and

engine
mamfold

vacuum

Signals
are

constantly
fed
to
the
transmiSSIOn

to

prOVide
the

proper

gear
ratIO

for
maximum

effiCiency
and

performance
at
all
throttle

openmgs

The
Model

3N71B
has
SIX
selector

poSitIOns

P
R
N

D
2
1

p
Park

pOSitIOn

posItively
locks
the
out

put
shaft
to

the
transmiSSIOn

case

by
means
of

a

lockmg

pawl
to

prevent
the
vehicle
from

rollmg
either

directIOn

ThiS

pOSitIOn
should
be
selected
whenever
the

dnver

leaves
the
vehicle

The

engme
may
be
started
m
Park

pOSition

R
Reverse

range
enables

the
vehicle

to

be

operated
m
a
reverse
direction

N
Neutral

pOSitIOn
enables
the

engine
to

be
started
and

run
Without

dnvIngthe
vehicle

0
Drive

range
IS
used

for
all
normal

driVing
conditions
Dnve

range
has
three

gear

ratios
from
the

startmg
ratIO
to
direct
dnve

2
2

range
prOVides
performance
for

dnvIng
onshppery
surfaces

2

range
can
also

be

used
for

engine

brakmg

2

range
can

be
selected
at

any
vehicle

speed

and

prevents
the
transmlsslOn

from

shifting

out
of
second

gear

108
Rg
162
Idenllflcatlon

number

I
1

range
can
be

selected
at

any
vehicle

speed
and
the
transmiSSIOn
will
shift
to
second

gear
and

remain
m
second
until
vehicle

speed

IS
reduced
to

approximately
25
to
31
MPH

1

range
posItion
prevents
the
transmiSSIOn

from

shlftmg
out

of
low

gear
ThiS

IS

par

tlcularly
benefiCial
for

mamtamIng
maximum

engine
brakmg
when

continUOUS
low

gear

operation
IS
deSirable

The

torque
converter

assembly
IS

of
welded

constructIOn
and
can
not
be
dlssassembled
for

service

FlUld
Recommendatwn

Use
automatic
transmiSSIOn
flUid

haVing

DEXRON
IdentificatIOns

only
m
the
3N71B

automatic
transmiSSIOn

denttficatwn
Number

Stamped

posttwn

The

plate
attached
to
the

rIght
hand
Side
of

transmission
case
as
shown
m

Figure
161

denttficatwn
of
number

arrangements

See

Page
109

RECOMMENDATIONS

Due
to
the

compleXity
of

setting
up
a

disassembled
transmissIOn
as
well

as
the

special
tools

necessary
It

IS
recommended

thaL
nternal

epalrs
be
left
to

a

fully

eqUip

ped
shop

Transmission

AUTOMATIC

TRANSMISSION

IDENTIFICATION

Model
code

JAPAN

AUTOMATIC

I
0
TRANSMISSION

CO
L
TD

MODEL

NO
XOIOO

2412345

Unit
number

NlIlllher

deSignatIOn

2412145

c

l
Sendl

productIOn

number
for
the
monfh

Month
of

production

X
Oct
Y
Nov

Z
Pel

LJ
t

fll
Ure

denotmg

the

yedf
A
D

r

108

n

f
x

J
y
J

li

i
j

11

t
i

j

r

t
t

t

if

j

f

1

i

1

1

j

r

i

t
2
t

I
tf

j

Or
1
A
Z

J
t

111

t
J

j

l
t

c
j
l
t
1

1t

1i
tI
1
f
l

1

JH

of
l

1

N

J

j1
t

Bod
Work

HOOD

Removal

DI
connect
the

WInd
hwld
washer
hose
at
the

nozzle

In
order
to

protect
the
hood
from

damaging

place
rag
In
hoth
Ide
of
the
hood

rear
end

loosen
the
hood

hinge
installatIOn
bolts
and

remove
the
hood

UPPOl

tIng
It
from
both
SIdes

as
shown
In
the

follOWing
figure
Two

workers
are

required

Installation

Install
the
hood
In

reverse
sequence
of

removal
carefully
so
that
the
hood
IS
flush

FIg
163
Removmg
hood

hmge

Fig
164

Removmg
hood

U2
with
the
fender

top
and
clearance
between
the

hood
and
fender
IS

aligned
evenly
toward

overall
circumference
of
the
hood
when
the

hood
IS
closed

HOOD
LOCK

Removal

Remove
the
radiator

gnlle
loosen
the
in

stallation
bolts
and
remove
the
male
Side
of

the
hood
lock

Disconnect
the
hood
lock
wire
from
the
female

Side
of
the
hood
lock
and
remove
the
female

Side
of
the
hood
lock

Remove
three
screws
and

remove
the
hood

lock
control
lever

Adjustment

Centermg
the
Hood
Lock

The
male
Side
hook
lock
IS

prOVided
with

a

o
118
In

adjusting
stroke
toward
left
and

nght

Sides
of
the
vehicle
and
the
female
SIde
with

a

0118
In

adjustIng
stroke
toward
front
and

rear
Sides
of
the
vehicle
Loosen
the
in

stallatIOn
bolts
and

align
the
center

correctly

I
Dov
tall
bolt

2

Dovetail
bolt

retammg
nut

31
Spong

4

Sarety
catch
lever

5

I
hmaJc
lever

6

Spnng

j
7JjHood
lod
control

lever

8
Rubber

grommet
Ii

5

4

il

Fig
165
Hood
lock
mechamsm

Bod
Work

Adjusting
Hood
Lock
Control
Lever

Operating
Force

When
the
control
lever

operatmg
force
IS
ex

ceSSlve
loosen
the
dove
tail
bolt

retammg
nut

2
Increase
dove
tall
bolt
1

mstalled

length

and
reduce
tensIOn
of
the

spring

Tightening
torque

Dove
tall
bolt

retaining
nut

108
to
18
1

ft
lb

Fig
166

Removing
male
Side
of
the
hood
lock

DovetaIl
bolt
lock

nut

Ttghtenlllg
torque
1
5
to
2
5

kg
m
1108
to
18
1
It
Ib

FIg
167

Removing
female
Side
ofthe
hood
lock
FIg
169
Section
view
of
hood
lock

2
10
6
mm

0079
10

0
236
on

Fig
168

Removing
hood
lock
control
lever

Fig
170
Checking
free

play
of
hood

panel

U3

Bod
Work

J

G
3

1

7
iJ
0
t

Fig
171
Adjusting
dove
tall
boll

AdJustmg
Hood

TIghtness

After

clOSIng
the
hood

panel
completely
push

the
center

of
the
front

portIon
of
It

by
hand

and
check
whether
there
IS
a
free

play
of

o
079
to
0

236
In

If
It

IS
out
of
the
above
mentIOned

range
ad

Just
the

length
of
the
dove
tall
bolt
1
to
In

crea
ie
or
decrea
ie
tensIOn
of
the

sprIng

After

adJustIng
tighten
the
dove
tall
bolt

retaInIng
nut
to
above
the

tIghtenIng
torque

Notes
When

inspecting
the
hood
lock

note

the

following
matters

a
Check

to
be
sure
that
dove
tail
bolt

retaining
nut
2

is

tightened
securely
with

specifIed
tightening
torque

b
Check
catcher
of
the

safety
catch
lever

for
wear
and
the

spring
3
for
weakness

and
break
If
the

spring
is
broken
the

hood

may
be
unlocked
and

rapidly
open

du

ring
driving

c
Check
the
female
lever
for
smooth
and

correct

operation
and
the

spring
6
for

weakness
and
break

If
the
female
lever
does
not

move

smoothly
engaging
stroke
with
the

dove
tail
bolt
wilLbeoreduced
and
it

may

be

disengaged

1M
9

A
5
Omm
O
197
m

B
8
5
mm
0
335
m

Fig
172
Safety
catch
lever

positIOn

LUBRICATING
POINT

Fig
173

Lubncatlng
POints

d
Measure
the
dimension
8
to
check

the
dimension
A
The
dimension
8

should
be
more
than
0
335
in

Lubrication

When

check
or

adjust
the
hood
lock
lubricate

the

pIvOt
catcher
and
return

sprIng
3
of
the

safety
catch
lever
4

thoroughly
Also

lubricate
the
lever
of
the
hood
lock
femel
5

focsmooth
all

c1
orr

i
operatIon
Se

ylgur

173