Datsun 1600 - COOLING SYSTEM FAULT DIAGNOSIS; COOLANT LEAKAGE ISSUES; ENGINE OVERHEATING DIAGNOSIS; COOLANT CIRCULATION PROBLEMS

Cooling System 6
7 COfn
INf S ST M
FAUI
T BIAf NOSIS
Coolant
leakage
external
Possible
cause
a
Loose hose
chps
or
faulty
hoses
b
Lealang
radJator
core
or tanks
c
Worn or
damaged
water
pump
seal
assembly
d
Worn or
damaged
water
pump beanng assembly
e
Loose or rusted
expansIOn plugs
I
External crack m
cyhnder
block or head
g
Faulty
cyhnder
head
gasket
or
loose
holdmg
down
bolts
h
Leaks
at thermostat
cover and
or water
pump
lOIn
t
gaskets
2
Coolant
leakage
mternal
Possible cause
a Crack m
cyhnder
bore wall
b Crack
m
cyhnder
head combustion chambers or
valve
ports
c
Cyhnder
head cracked
and
lealang
mto valve
rocker
compartment
d Cracked
cyhnder
block
water
pcket
leakmg
mto
engme tappet compartment
e
Cyhnder
head
gasket
leak due
to
warped
head
3
Coolant
loss
by
overflow
Possible wuse
a
Over full
system
b
Faulty
pressunsed
radiator
cap
c Blo
ked
radiator
core
tubes
d
Coolant
foannng
due to
poor
quahty
antI freeze
or
corrosIOn
InhIbItor
4
EngIne
overheatmg
Possible
cause
a Obstructed alT passage
through
radIator core from
front to rear
b Incorrect
IgmtIon
tmllng
c
Incorrect valve
tmung
d Low
engIne
all
level
e
EngIne tIght
after overhaul
I
Poor
clTculatJOn
g
Loss of coolant due to
overflow
h
Faulty
thermostat
I
Restncted muffler
or tall
pIpe accomparned
by
loss
of
power
1 Inwrrectly adjusted
or
draggmg
brakes
5
Coolant
clfculatlOn
faulty
PosSible
cause
a
PartJaI
blockage
of
radIator core tubes
b Water sludge
depOSits
In
engme
water
Jacket
c Fan belt broken or
shppmg
d
Faulty
water
pump
or thermostat
e
Collapsmg
lower radIator
hose
I
InsufficIent
coolant
m
system
I
Remedy
TIghten
hose
chps
or
renew
faulty
components
RepalT
or renew radiator
Renew seal
assembly
Renew water
pump
beanng
and
shaft
Jssembly
Renew
faulty
components
Renew
faulty
components
Renew
gasket
and
correctly
tIghten
yhnder
head
bolts
RectIfy
leaks
Remedy
Renew
cylmder
block
Renew
cyhnder
head
Renew
cyhnder
head
lt
l
l
Renew
cyhnder
blo
k
to
1
Reface
cylmder
head and renew
gasket
Remedy
Dram and refill
to W below
filler
neck
Renew
faulty cap
Clean
or
renew
radIator
core
Dram
system
and
renew
coolant and additive
Remedy
Blowout
obstructIOn
from rear to front of
radla tor
core
WIth
compressed
alT or
water
pressure
Check
and reset
Igmtlon
tInnng
Check and reset
yalve
tJnnng
Stop engIne ImmedJately
and
replemsh
Oil m
sump
Check and If
satIsfactory
stop
engme
and allow to cool
out
Check and
re
tIfy
as under Item
5
Check and
rectIfy
as under Item
3
Renew
thermostat
Remove restnctJOns
or renew
component
s
Check and
rectIfy
by adjustment
or
renewal
of
components
Remedy
Clean out
or renew radJJtor
core
Clean
and flush
engme
water
Jacket
and add
rust
mJubltor
to coolant
Renew
or
adjust
fan
belt
Overhaul
or renew
water
pump
renew thermostat
Check
and renew lower radJator
hose and check
radIator
core tubes
Replemsh
coolant
45
2
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