1977 DATSUN PICK-UP Service Manual

dead battery open trunk alternator headlights clock reset jump start low beam

Page 41 of 537

DATSUN PICK-UP 1977 Service Manual
Condition

IMPROPER
ENGINE

IDLING

Fuel

system
out
of

order

Low

compression

Others

High
engine
idle

speed
Engine
Tune

up

Probable
cause

Clogged
or

damaged
carburetor

jets

Inco

Condition

IMPROPER
ENGINE

IDLING

Fuel

system
out
of

order

Low

compression

Others

High
engine
idle

speed
Engine
Tune

up

Probable
cause

Clogged
or

damaged
carburetor

jets

Incorrect
idle

adjustment

Clogged
air
cleaner
filter

Damaged
manifold

gaskets
or
carburetor

insulator

Improper
float
level

adjustment

Loose
air

hoses
or
air

fuel
mixture
hoses
of

carburetor

Malfunctioning
carburetor
choke

Malfunctioning
anti

backfire
valve

Malfunctioning
automatic

temperature
con

trol
air

cleaner

Inoperative
idle

compensator

Carbon
canister

purge
line
hose

damaged
or

disconnected

Stick
E

F
E
valve
shaft

Incorrect
valve
clearance

Extremely
low
revolution

Faulty
malfunction
of
the

ignition
system

spark
plug

high
tension
cable
breaker

point
ignition
coil
etc

Incorrect
basic

ignition
timing

Malfunction
of
choke
valve
or

linkage

Malfunction
of
vacuum
motor
sensor
or

hoses
of
air
cleaner

Incorrect
idle

adjustment

Clogged
air
cleaner
fdter

Malfunction
of
idle

compensator
of

air

cleaner

Malfunction
of
E
G
R
control
valve

Loose
manifold
and

cylinder
head
bolts

Dragged
accelerator

linkage

Incorrect
idle

adjustment

Malfunction
of
B
CDD

system

Malfunction
of

speed
switch
and
harness

ET
29
Corrective
action

Clean
or

replace

Adjust

Replace
element

Replace
gasket
or
insulator

Adjust

Check
for
loose
connections

Check
and

adjust

Check
for
loose
connection
of
vacuum
hose

Check
A

r
C
air
cleaner

Check
for
connection
of
idle

compensator

hose

or
replace
idle

compen
tor

Connect
or

replace

Repair

Previously
mentioned

Adjust

Adjust

Replace

Adjust

Adjust

Check
for
loose
hoses

Replace
system
com

ponents
if
necessary

Adjust
idle

speed

Replace
air
cleaner
fdter

Replace

Clean
or

replace

Retighten
bolts

Check
and

correct
accelerator

linkage

Adjust
idle

speed

Check
for
loose

vacuum
hose
and
harness

connections

Adjust
or

replace
if

necessary

Check
for
loose
connections

Repair
or

replace
if

necessary

Page 42 of 537

DATSUN PICK-UP 1977 Service Manual
Condition

ENGINE
POWER
NOT

UP
TO
NORMAL

Low
compression

Ignition
system
out
of

order

Fuel

system
out

of

order

Air
intake

system
out

of
order

Emission
control

Overheating

O

Page 43 of 537

DATSUN PICK-UP 1977 Service Manual
Condition

NOISY

ENGINE

Car

knocking

Mechanical

knocking

Crankshaft

bearing

Imocking

Connecting
rod

bearing
knocking

Piston
and

cylinder

noise

Piston

pin
noise

Water

pump
noise

Condition

NOISY

ENGINE

Car

knocking

Mechanical

knocking

Crankshaft

bearing

Imocking

Connecting
rod

bearing
knocking

Piston
and

cylinder

noise

Piston

pin
noise

Water

pump
noise

Air

pump
noise

Others
Engine
Tune

up

Probable
cause

Overloaded

engine

Carbon

knocking

Timing
knocking

Fuel

knocking

Preignition
misusing
of

spark
plug

This

strong
dull
noise
increases
when

engine

is

accelerated
To
locate
the

place
cause
a

misfire

on
each

cylinder
If
the
noise

stops

by
the
misfire
this

cylinder
generates
the

noise

This
is
a
little

higher
pitched
noise
than
the

crankshaft

Imocking
and
also
increases

when

engine
is
accelerated
Cause
a
misfire

on
each

cylinder
and
if
the
noise
deminishes

almost

completely
this
crankshaft

bearing

generates
the
noise

When

you
hear
an

overlapping
metalic
noise

which
increases
its

magnitude
with
the

revolution
of

engine
and
which
decreases
as

engine
is
warmed

up
this
noise
is
caused

by

piston
and
cylinder
To
locate
the

place

cause
a
misfire
on
each

cylinder

This
noise
is

heared
at
each

highest
and

lowest
dead
end
of

piston
To
locate

the

place
cause
a

misfire
on
each

cylinder

This
noise

may
be
caused

by
worn
or

damaged
earings
or
by
the
uneven
surface

of
sliding

parts

Damaged
air

pump

An
improper
adjustment
of
valve
clearance

Noise
of

timing
chain

An
excessive
end

play
on
crankshaft

Noisy
E
F
E

valve
shaft

Wear
on
clutch

pilot
bushing

Note
This
noise
will
be
heared
when

clutch
is

disengaged

ET31
Corrective
action

Use

right
gear
in
driving

Disassemble

cylinder
head
and

remove

carbon

Adjust
ignition
timing

Use

specified
octane
fuel

Use

specified
spark
plug

This
is

caused

by
worn
or

damaged
bearings

or
unevenly
worn
crankshaft
Renew

bearings
and

adjust
or

change
crankshaft

Check
lubrication

system

Same
as
the
case
of
crankshaft

bearings

This

may
cause
an
abnormal

wearing
of

cylinder
and
lower

compression
which
in

turn
will
cause
a
lower
out

put
power
and

excessive

consumption
of
oil

Overhaul

engine

This

may
cause
a
wear
on

piston
pin
or

piston
pin
hole

Renew

piston
and

piston

pin
assembly

Replace
water

pump
with
a
new
one

Repair
or

replace

Adjust

Adjust
the
tension
of
chain

Disassemble

engine
and
renew
main
bearing

Repair

Renew
bush

and

adjust
drive
shaft

Page 44 of 537

DATSUN PICK-UP 1977 Service Manual
Condition

ABNORMAL

COMBUSTION

backfue
afterflre

run
on
etc

Improper

ignition
timing

Fuel

system
out
of

order

Faulty
cylinder
head
etc

Others

EXCESSIVE
OIL

CONSUMPTION

Oilloak

Condition

ABNORMAL

COMBUSTION

backfue
afterflre

run
on
etc

Improper

ignition
timing

Fuel

system
out
of

order

Faulty
cylinder
head
etc

Others

EXCESSIVE
OIL

CONSUMPTION

Oilloak

Excessi
lo
oil

consumption

Others
Engine
Tune

up

probable
cause

Improper
ignition
timing

Improper
heat

range
of

spark
plugs

Damaged
carburetor

or
manifold

gasket

backfue
afterfire

Clol
l
ed
carburetor

jet

Improper
function
of

the
float

Uneven

idling
Run
on

Improperly
adjusted
B

C
D
D

set

pressure

Malfunction
of
anti

dieseling
solenoid
valve

Malfunction
of
auio
choke

Improperly
adjusted
valve
clearance

Excess
carbon
in

combustion
chamber

Damaged
valve

spring
backfire
afterflre

Malfunction
of

A
T
C

air
cleaner

Inoperative
ariti
backfue
valve

Loose
oil
drain

plug

Loose

or
damaged
oil

pan
gasket

Loose
or

damaged
chain
cover

gasket

Worn
oil
seal
in
front
and
rear
of
crankshaft

Loose
or

damaged
locker
cover

gasket

Improper
tightening
of
oil
filter

Loose
or

damaged
oil

pressure
switch

Cylinder
and

pioton
wear

Improper
location
of

piston
ring

gap
or

reversely
assembled

piston
ring

Damage
piston
rings

Worn

piston
ring
groove
and

ring

Fatigue
of
valve
oil
seal

lip

Worn
valve

stem

Inadequate
quality
of

engine
oil

Engine
overheat

ET32
Corrective
action

Adjust
ignition
timing

Use

specified
spark
plugs

Replace
them
with
new

parts

Disassemble
carburetor
and
check
it

Adjust
the
level
and
check
needle
valve

Adjust

Adjust

Check
or

replace

Adjust

Adjust

Remove
head
and

get
rid
of
carbon

Replace
it
with
a
new
one

Check
for
loose
vacuum
hoses

Replace
if

necessary

Replape

Tighten
it

Renew

gasket
or

tighten
it

Renew

gasket
or

tighten
it

Renew
oil
seal

Renew

gasket
or

tighten
it
but
not
too

much

Renew

gasket
and

tighten
it
with
the

proper

torque

Renew
oil

pressure
switch
or

tighten
it

Overhaul

cylinder
and
renew

piston

Remoun
t

piston
rings

Renew

rings

Repair
or
renew

piston
and

cylinder

Renew

piston
and

piston
ring

Replace
seal

lip
with
a

new
one

Renew
valve
or

guide

Use
the

designated
oil

Previously
mentioned

Page 45 of 537

DATSUN PICK-UP 1977 Service Manual
Condition

POOR
FUEL
ECONOMY

Se
the

xplanation

of
the
pow
r

dec

Oth
n

PROBLEM
IN

OTHER

FUNCTIONS

D
cr
d

oil

p
ssure

Excessive
wear
on
the

sliding

parts

Scuffing
of

slid

Page 46 of 537

DATSUN PICK-UP 1977 Service Manual
DATSUN
PICK
UP

MODEL

620
SERIES

lMlSSAN
I

oJ

NISSAN
MOTOR
CO
LTD

TOKYO
JAPAN
SECTION
EM

ENGINE

MECHANICAL

GENERAL
DESCRIPTION

ENGINE
DISASSEMBLY

INSPECTION
AND
REPAIR

ENGINE

Page 47 of 537

DATSUN PICK-UP 1977 Service Manual
Engine
Mechanical

GENERAL
DESCRIPTION

MODEL

L20B
ENGINE

CYLINDER
BLOCK

CRANKSHAFT

PISTON
AND
CONNECTING
ROD

CYLINDER
HEAD
CONTENTS

EM
2

EM
3

EM
3

EM
3

EM
3
CAMSHAFT

VALVE

Engine
Mechanical

GENERAL
DESCRIPTION

MODEL

L20B
ENGINE

CYLINDER
BLOCK

CRANKSHAFT

PISTON
AND
CONNECTING
ROD

CYLINDER
HEAD
CONTENTS

EM
2

EM
3

EM
3

EM
3

EM
3
CAMSHAFT

VALVE
MECHANISM

CAMSHAFT
DRIVE

MANIFOLDS

out
smooth

dependable

power

The

cylinder
block
is
cast
as
a

single

unit

and

featllres
deep
skirting
This

engine
is

equipped
with
a

single
2

barrel
downdraft
carburetor
that
in

corporates
a

special
device
to
control

emissions
MODEL
L20B

ENGINE

The
L20B

engine
features
O
H
C

valves

wedge
shaped
combustion

chamber
aluminum
head
and
a

fully

balanced
5

bearing
crankshaft
to
turn

Main

specifications

Oisplacemen
t
cc

cu
in

Bore
x
stroke

mm
in

Compression
ratio

Ignition

timing

Degree
B

T
O
C

rpm
MIT

AlT

MIT
Manual
Transmission
EM535

Fig
EM
Cross
sectional
view

L20B

1

952
1191

85

X
86

3
35
x
3
39

8
5

12
750

Non
California

model

10
750

California

model

12
650
in
0
position

AIT
Automatic
Transmission

EM

2
EM
3

EM
3

EM
3

EM
3

CYLINDER
BLOCK

The

cylinder
block
a
mono
block

special

casting
structure

employs
a

five
bearing

support

system
for

quiet

ness

and

higher
durability

The

cylinder
bores
are
surrounded

by
cooling

jackets
and
machined
di

rectly
in
the
block
The
oil

ways
in
the

block

are
arranged
so
that
the

full
flow

oil
filter
is

directly
attached
to
the

right
hand
side
of
the
block

EM536

Fig
EM

2
Cylinder
block

CRANKSHAFT

The
crankshaft
is

a

special
steel

forging
Fully
balanced
it
turns
out

smooth

dependable
power
at

high

speed

The
L20B

engine
uses

eight
balance

weights

Main

bearings
are
lubricated

by
oil

pumped
through
the
main
oil

gallery

and
the
oil
holes
which
run
in

parallel

with

cylinder
bores
There

are

oilways

drilled
in

the
crankshaft
for
the
lubri

cating
oil
The
center
main

bearing
is

equipped
with
thrust
washers

to
take

up
end

thrust
of
the
crankshaft

Page 48 of 537

DATSUN PICK-UP 1977 Service Manual
Fig
EM

3

Crankshafl

PISTON

AND

CONNECTING
ROD

The

pistons
are

of
a

special
alumi

num

casting
and
have

struts
to
control

thermal

expansion
two

compression

rings
and

one
co

Fig
EM

3

Crankshafl

PISTON

AND

CONNECTING
ROD

The

pistons
are

of
a

special
alumi

num

casting
and
have

struts
to
control

thermal

expansion
two

compression

rings
and

one
combined
oil

ring
The

piston
heads

are
slightly
dished

The

piston
pil1S
are
a

special
hollow

steel

shaft

They
are
full

floating
fit
to
the

piston
and

press
fit
to
the

connecting

rods

The

connecting
rods
are
of
a

special

forged
steel
Oil
is

sprayed
to
the

connecting
rod
small
ends

through

drilled

passages
in

the

large
ends
of

rod

Oil
holes
in

the

connecting
rods

are
located
so
as
to
insure

optimum

lubrication
under

heavy
load

0
50
1

o

E

Moao

Fig
EM
4

Piston
and

connecting
rod

CYLINDER
HEAD

The

cylinder
head
is

made
of
a

light
strong
aluminum

alloy
with

good

cooling
efficiency
it
contains

wedge

type
combustion
chambers
A

special

aluminum
bronze
valve
seat
is

used
on

the
intake
valve
while
a
heat
resistant

steel
valve
seat
is
installed

on
the

exhaust
valve
These

parts
are

all
hot

press
fitted

EM407

Fig
EM
S

Cylinder
head
Engine
Mechanical

CAMSHAFT

The
camshaft
is

made
of
a

special

cast
iron
and
is
loca
ted
inside
the

rocker
cover
Four
aluminum

alloy

brackets

support
it
Camshaft

bearings

are
lubricated
from
oil
holes
which

lead
to
the

main
oil

gallery
of
the

cylinder
head

Concentric

passages
are
drilled
in

the

front
and

rear

parts
of
the

earn

shaft

Oil
to
each
earn
lobe
is

supplied

through
an
oil

hole
drilled
in
the
base

circle
of
each
lobe
Lubricant
is

sup

plied
to
the
front
oil

gallery
from
the

2nd
camshaft

bearing
and
to
the

rear

oil

gallery
from
the

3rd
camshaft

bearing
These

holes
on
the
base

circle

of
the

lobe

supply
lubricant
to
the

earn

pad
surface
of
the
rocker
arm

and

to
the
valve

tip
end
The
cams
feature

a

long
overlap
profile
to
reduce
NOx

emission

Fig
EM
6

Camshafl

VALVE
MECHANISM

The
valve

system
has
the

pivot
type

rocker

arms
that

are
activated

directly

by
the
earn
mechanism

this
has
made

its

moving

parts
considerably
lighter

and

provides
ideal

high
speed
perform

ance

Dual

type
valve

springs
are
in

stalled

h

@l

if

Exhaust

Intake
EM084

Fig
EM
7
Valve
mechanism

EM

3
CAMSHAFT
DRIVE

The
camshaft
is
driven

by
a
double

row
roller
chain
driven

by
the

crank

shaft
The
tension
of
the

chain
is

controlled

by
a

chain
tcosioner

which

is

operated
by
spring
and
oil

pressure

The
rubber
shoe

type
tensioner

damps

vibration

of
the

chain
and
controls
its

tension

EM537

Fig
EM

8
Chain

driving

aystem

MANIFOLDS

The
intake
manifold
is
of
an
alumi

num
cast

alloy

The
exhaust
manifold
is

of
a
dual

design
and

incorporates
a
heat
control

valve
in
it
The

heal
control
valve
is

used
to

warm
the
intake
manifold

A

plate
is
installed
on
the
outer

face
of
the
manifold
to
draw
hot

intake
air

out

through
it
The
exhaust

pipe
is
connected
to
the

flanged
sur

face
of
the
exhaust
manifold

Fig
EM

9
Intak
and
exhaust

manifolds

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