overheating DATSUN 210 1979 Service Manual

Condition

ENGINE
POWER
NOT

UP

TO
NORMAL

Low

compmsion

Ignition
system
out
of

order

Fuel

system
out
of

order

Air
intake

system
out

of

order

Emission
control

Overheating

J

f
H
r

Overcooling
Engine
liune
up

Probable
cause

Malfunction
of
throttle
valve
switch
and

linkage
FU

models

Incorrect

ignition
timing

Damaged

spark
plugs

Wom
distributor

points

Malfunction
of

T
C
S

cMalfunction
of
S
D
V

Milfunction
of
choke

system

Clogged
fuel

pipe
or

floating
valve

Dirty
or

clogged
fuel
filter

Fuel

pump
will
not
work

properly

Clogged
carb

retor

jets

Clogged
air
cleaner

Air

aling
from
manifold

g
sket
r

carburetor

gasket

Malfunction
of
E

G
R
valve

Stick
E

F
E
valve
shaft

Insufficient
coolant

Loose
fan
bel

Wom
or
oiled
fan
belt

Inoperative
therinostat

Wom
ater

pu
p

Clogged
or
leaky
radiator

Wom
radiator
filler

ca

Air
in

cooling
ystein

Improper
engine
oil

grade

Incorrect

ignition
timing

Clogged
carburetor

lean
miiture

Inoperative
thermostat

1

ET
19
Corrective
action

Check
throttle
valve
switch
and

linkage

Adjusi
i
r

replace
if

necessary

Previously
m
entioned

Adjust

Clean

adjust
or

replace
plugs

Dress
or

replace
points
Also
check

condenser

Check
and

correct

Check
and

replace

Adjust

Clean

Replace

Repair
or

replace

t
J
Disassemble
and
clean

Replace
element

Replace

gasket

Check
and

replace

Repair

Replenish

Adjust
fan
belt

Replace

Replace

Repl
ce

Flush

repair
or

replace

ReplaCe

Retightin
e
ch

part
of

cooling
system

Replace
with

proper
grade
oil

Adjust

Overhaui
carburetor

Replace

Condition

Waterpurnp

knocking

II
Othw

mllChani

troubl

Stuck

valve

Seized
valve

seat

Excessively
wom

cylinder
and

piston
Engine
Mechanical

Probab
Ie
cause

Improper
shaft
end

play

Broken

impeller

Improper
valve
clearance

Insufficient
clearance
between
valve
stem
and

guide

Weakened
or
broken
valve

pring

Biting
or

damage
of
valve
stem

Poor
fuel

quality

Il1
prop
r
valve
clearance

Weakened
valve

pring

Thin
valve
head

edge

Narrow
valve

seat

Overheating

Over

speeding

Sticked
valve

guide

Shortage

ofengine
oil

Dirty
engine
oil

Poor
oil

quality

Overheat

Wrong
assembly
of

piston
with

connecting
rod

Improper
piston
ring
clearance

Dirty
air
cleaner

Too
rich
mixture

Engine
over
run

Stuck
choke
valve

Over

choking

EM
32
Corrective

action

Replace

Replace

Adjust

Clean
stem
or
ream
the

guide

Replace

Repil
ce
or
clean

Use

good
fuel

Adjust

Replace

Replace
valve

Reface

Repair
or

replace

Drive
at

proper
speed

Repair

Add
or

replace
oil

Check
oil
level
on

daily
basis

Clean
crankcase

replace
oil
and
re

place
oil
ftIter
element

Use

proper
oil

Repair
or

replace

Repair
or

replace

Adjust

Clean

periodically

Adju
t

Drive

correctly

Clean
and

adjust

Start
in
correct

way

Condition

Loss
of

water

Poor
circulation

Corrosion

Overheating

Over

cooling
Cooling
System

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Probable
cause

Damaged
radiator
seams

Leaks

at
heater
connections

or
plugs

Leak
at

water

temperature
gauge

Loose

joints

Damaged
cylinder
head

gasket

Cracked

cylinder
block

Cracked

cylinder
head

Loose

cylinder
head
bolts

Restriction
in

system

Insufficient
coolant

Inoperative
water

pump

Loose
fan
belt

Inoperative
thermostat

Excessive

impurity
in
water

Infrequent
flushing
and

draining
of

system

Inoperative
thermostat

Radiator
fin
choked
with
mud
chaff
etc

Incorrect

ignition
and
valve

timing

Dirty
oil
and

sludge
in

engine

Inoperative
water

pump

Inoperative
torque
coupling
or

tem

coupling

Loose
fan
belt

Restricted
radiator

Inaccurate

temperature
gauge

Impurity
in
water

Inoperative
thermostat

Inaccurate

temperature
gauge

CO
7
Corrective
action

Repair

Repair

Tighten

Tighten

Replace

Check

engine
oil
for

contamination
and
reml

as

necessary

Replace

Check

engine
oil
in

crankcase
for

mixing

with
water

by
pulling
oil

level

gauge

Replace

Tighten

Check
hoses
for

crimps
and
clear
the

system

of
rust
and

sludge
by
flushing
radiator

Replenish

Replace

Adjust

Replace

Use
soft
clean
water
rain

water
is
satis

factory

Cooling
system
should
be
drained
and
flush

ed

thoroughly
at
least
twice
a

year

Permanent
antifreeze

Ethylene
glycol
base

can
be

used

throughout
the

seasons
of
the

year
and

change

periodically
at

intervals

recommended

Replace

Clean
out
air

passage
thoroughly
by
using
air

pressure
from

engine
side
of
radiator

Adjust

Refill

Replace

Replace

Adjust

Flush

radiator

Replace

Use
soft
dean
water

Replace

Replace

following
functions
without

affecting

the

effectiveness
of
the

exhaust
emis

sion
control

system

Minimizes
exhaust

gas
tempera

ture
rise

2
Minimizes

horsepower
losses
reo

sulting
from
air

injection
into
the

exhaust

system

3

Protects

pump
from
excessive

back

pressure

To
carburetor

air
cleaner

Secondary

ir

Not
actuated

To
carburetor

air
cleaner
J

l
Secondary

sir

Actuated

EC294

Fig
EC
18
Air

Pump
Relief
Valve

c
A
C
valve

Californiamodels

The
C
A
C
valve

controls
the

quantity
of

secondary
air
fed
from
the

air

pump
according
to
the
load
condi

tion
and
it

discharges
the

secondary

air
into
the

atmosphere
to

prevent

overheating
of

the

catalytic
converter

This
valve
is

operated
by
intake

manifold
vacuum

and
air

pump
dis

charge

pressure
When
intake
manifold

vacuum
is

small
or
in

the

high
load

range
the
No
2
valve

opens
when
it
is

great
or
in

the
low
load

range
the
No

I

valve

opens
If
air

pump
discharge

pressure
is

large
or
the

engine
is

running
at
a

high
speed
the
No
3

valve

opens
admitting
the
air

pump

discharge

pressure
to
the
No
2
dia

phragm
chamber
of
the
C

A
C
valve
mission
Control

System

and

opening
ihe
No
i
valve
At
this

point
the
No
2
valve

serves
as
a

relief

valve

F
111

air
pump
No
3

valve

EC787

Fig
EC
19

C
A
C
Valve

I
Engine
in
low

speed
and

light
load

When
the

engine
is

operating
under

these
conditions
intake
vacuum
is

high
The
No
2
valve
unitized

with

the
No
I

diaphragm
is

lifted

by
the

intake

manifold
vacuum

pushing
up

the
No
I

valve
These
valves
will
then

stop
at
a

position
where
a

balanced

condition
exists
between
air

pump

discharge
pressure
an
d

spring
tension

acting
on
the

No
I

and
No

2
valves

The

No
2

jiaphragm
however
does

not
move
due

to
low

engine
speed
low

air

pump
discharge
pressure
and

spring

tension

acting
on
the
No

3
valve
For

this
reason
these
valves
are

brought
to

a
balanced
condition

To
intake
manifold

t

i

l

3

Spring

4

ValveNo
3

5
Di

phragm
No
I
I

@

6

Spring

7

Valve
No
1

8
Valve
No

2

EC683

Fig
EC

20

Operation
of
C
A
C

Valve

1

2

Engine
in

low

speed
and

heavy
load

EC12
Wheo
the

engine
is

operating
under

these
cooditions

intake
manifold

vacuum
is
low
and

all
valves

are

balanced

t
To

intake

manUol

U

E

ii

ji
j

Ii
5

LL

jj

Ii
JI

l
Jij

ulJC

1t

To

atmosphere
EC685

Fig
EC
21

Operation
of
C
A
C

Valve
2

3

Engine
in

high
speed
and

middle

load

When
the

engine
is

operating
under

these
conditions
intake

manifold

vacuum
lies

midway
between
1

and

2

above
The
No
3
valve

moves
to

the
left

because
of

high
air

pump

discharge
pressure

To

intake
manifold

t

L

J

f
E

bt

I
5

tfi
11

I

LJr

To

tmg
J
j
1

EC
4

Fig
EC
22

Operation

of
C
A
C

Volve
3

REMOVAL
AND

INSTALLATION

Air
pump
air
cleaner

Loosen

nuts

securing
air

pump
air

cleaner
to

bracket
then
detach
air

cleaner
from
bracket

Air
cleaner
filter

and
air
cleaner
lower

body
are
built

into

a
unit
construction

Replace
air

cleaner
filter
and
lower

body
as
an

assembly

INSPECTION

I

Disconnect

high
tension

cables

from

spark
plugs
by
pulling
on

boot

not
on
cable
itself

2

Remove

spark

plugs

3

Check
electrodes
and
inner

and

outer

porcelains
of

plugs
noting
the

type
of

deposits
and
the

degree
of

electrode
erosion

Refer
to

Fig
EE

76

Normal
Brown

to

grayish
Ian
de

posits
and

slighl
electrode
wear

indicate
correct

spark

plug
heat

range

Carbon
fouled

Dry
fluffy
carbon
de

posits
on
the
insulator
and
elec

trode
are

mostly
caused

by
slow

speed
driving
in

city
weak

ignition

too
rich
fuel
mixture

dirty
air

cleaner
etc

H
is
advisable
to

replace
with

plugs

having
hotter
heat

range

Oil
fouled

Wet
black

deposits
show

excessive

oil
entrance
into

comb
us

tion
chamber

through
worn

rings

and

pistons
or
excessive

clearance

between
valve

guides
and
stems
If

the
same
condition
remains
after

repair
use
a
hotter

plug

Overheating
White
or

light
gray
insu

lator
with
black
or

gray
brown

spots
and
bluish
burnt
electrodes

indicate

engine
overheating
More

over
the

appearance
results
from

incorrect

ignition
timing
loose

spark
plugs
low
fuel

pump
pres

sure

wrong
selection
of
fuel

a

hotter

range
plug
etc

H
is
advisable
to

replace
with

plugs

having
colder
heat

range

4
After

cleaning
dress
electrodes

with
a
smaU
fme
file
to
flatten
the

surfaces
of
both

center
and
side
elec

trodes
in

parallel
Set

spark
plug

gap
to

specification

5

Install

spark

plugs
and

torque

each

plug

6
Connect

spark
plug
wires

CLEANING

AND

REGAP

Clean

spark
plugs
in
a
sand
blast
Engine
Electrical

System

SPARK

PLUG

Conventional

type

Normal

Overheating

Multi

gap
type

Nonnal

Overheating

type
cleaner
Avoid
excessive

blasting

Clean
and
remove
carbon
or
oxide

deposits
but
do
not
wear

away
porce

lain
If

deposits
are
too
stubborn

discard

plugs

After

cleaning
spark

plugs
renew

firing
surface
of
electrodes
with
file

mentioned

above
Then
check

spark

plug
gap
with
wire

feeler

gauge
All

spark
plugs
new
or
used

should
have

the

gap
checked
and
reset

by
bending

ground
electrode

EEOSO

Fig
EE
77
Setting
Spark
Plug
Gap

Except
FU
model

EE
29
Carbon

fouled

EE079

Worn

Carbon

fouled

Worn

EE601

Fig
EE

76

Spark

Plug

EE586

Fig
EE
78

Setting
Spark
Plug

Gap
FU
models

Condition

Clutch

slips

Clutch

drags
Clutch

TROUBLE

DIAGNOSES
AND

CORRECTIONS

Probable

cause
and

testing
Corrective
action

Slipping
of
clutch

may
be
noticeable

when

any
of
the

following
symptoms
is

encountered

during
operation

I
Car
will
not

respond
to

erigine
speed
during
acceleration

2
Insufficient

car

speed

3
Lack
of

power

during
uphill

driving

Some
of
the

above
conditions

may
also
be
attributable
to

engine
problem
First
determine

whether

engine
or
clutch
is

causing
the

problem

If

slipping
clutch
is

left
unheeded
wear

and
or

overheating
will
occur
on
clutch

facing
to
such

an
extent
that
it
is

no

longer
serviceable

TO

TEST
FOR
SLIPPING
CLurCH

proceed
as
follows

During
upgrade
havelling
run

engine
at

about
40
to
50

km
h
25
to
31
MPH

with

gear
shift

lever
in

3rd
speed
position
shift
into

highest

gear
and
t
the
same
time

rev

up
engine
If
clutch

is

slipping
car
willnot

readily
respond
to

depression
of
accelerator

pedal

Clutch

facing
warn

excessively

Oil
or

grease
on
clutch

facing

Warped
clutch

cover
or

pressure
plate
Replace

Replace

Repair
or

replace

Dragging
clu

tch
is

particularly
noticeable

when

shifting

gears
especially
into

low

gear

TO
TEST
FOR

DRAGGING
CLurCH

proceed
as
follows

I
Start

engine

Disengage
clutch
Shift
into

reverse

gear
and
then
into
Neutral

Gradually

increase

engine

speed
and

again
shift
into
reverse

gear
If
clutch
is

dragging
gear
grating

is
heard
when

shifting

gears
from
Neutral
into

Reverse

2

Stop
engine
and
shift

gears
Conduct
this
test
at
each

gear
position

3
In

step
2

gears
are
shifted

smoothly

except
1st

speed
position
at

idling

a
If

dragging
is

encountered

at
the
end
of

shifting
check
condition
of

synchro

mechanism
in

transmission

b
If

dragging
is
encountered
at
the

beginning
of

shifting
proceed
to

step
4

below

4

Push

change
lever
toward
Reverse
ide

depress
pedal
to
check
for
free

travel
of

pedal

a
If

pedal
can
be

depressed
further
check
clutch
for

condition

b
If

pedal
cannot
be

depressed
further

proceed
to

step
5

below

5
Check

clutch
control

pedal
height
pedal
free

play
free

travel
withdrawal
lever

play
etc

If

any
abnormal

condition
does
not
exist
and
if

pedal
cannot
be

depressed
further
check

clutch
for

condition

Clutch
disc

runout
or

warped

Wear
or
rust

on
hub

splines
in

clutch

disc

Diaphragm
spring
toe

height
out
of

adjustment
or
toe

tip
worn

Worn

or

improperly
installed

parts
Replace

Clean
and
lubricate

with

grease
or

replace

Adjust
or
replace

Repair
or

replace

CL12