Datsun 1000 - Page 33

7 t OOLlNt
S STIl
1
AULT
IUAt NOSIS
Cooling
Y3tem
L Coolant
leakage
external
Possible calise
a
Lpose
hose
clips
or
faulty
hoses
b
Leaking
radiator core
or tanks
e
Worn or
damaged
water
pump
seal
assembly
d
Worn
or damaged
water
pump
bearing
assembly
e
Loos or rusted
expansion plugs
I
External crack in
cylinder
block or head
g
Faulty cylinder
head
gasket
or
loose
holding
down
bolts
h
Leaks
at
thermostat
cover
and
or
water
pump
joint gaskets
2
f
oolant
leakage
internal
Possible
cause
a Crack in
cylinder
bore
wall
b Crack in
cylinder
head
combustion chambers
or
valve
ports
c
Cylinder
head cracked and
leaking
into valve
rocker
compartment
d
Crackeq
cylinder
block water
jacket
leaking
into
engine
tappet
compartment
e
Cylinder
head
gasket
leak
due
to
warped
head
3
Coolani
loss
by
overflow
Possible cause
a Over
full
system
b
Faulty pressurised
radiator
cap
c Blocked radiator
core
tubes
Coolani
foaming
due
to
poor quality
anti
freeze
or
corrosion inhi itor
4
Engine overheating
Possible
cause
a Obstructed
air
passage through
radiator
core from
frout
to rear
b Incorrect
ignition timing
c Incorrect valve
timing
d
Low
engine
oil
level
e
Engine tight
after overhaul
I
Poor
circulation
g
Loss
of
coolani due to overflow
h
Faulty
thermostat
i
Restricted muffler
or
tail
pipe accompanied
by
loss of
power
j
Incorrectly
djusted
or
dragging
brakes
5
Coolant circnlation
faulty
Possible cause
a Partial
blockage
of radiator
core
tubes
b
Water
sludge
deposits
in
engine
water
jacket
c
Fan belt broken
or
slipping
d
Faulty
water
pump
or
tltermostat
e
Coll
psing
lower
radiator hose
I Insufficient coobnt
in
systelT
Remedy
Tighten
hose
clips
or renew
faulty components
Repair
or
renew r diator
Renew seal
assembly
Renew water
pump bearing
and shaft
assembly
Renew
faulty
components
Renew
faulty components
Renew
gasket
and
correctly tighten cylinder
head
bolts
Rectify
leaks
Remedy
Renew
cylinder
block
Renew
ylinder
head
l
enew
cylinder
head
Renew
cylinder
bloc
Reface
cylinder
head
and
reney gasket
Remedy
Drain and refill
to
l below filler
neck
Renew
faulty cap
Clean Of renew
radiator
cre
Drai
systemartd reneW
coolant
and additive
Remedy
Blow
o
t obstruction
from rear to front of radiator
core
with
compressed
airor
water
pressure
Check and reset
ignition timing
Check
and
res t valve
timing
Stop engine immediately
and
replenish
oil
in
sump
Check and if
satisfactory
stop erigineandallow
to
cool
out
Check and
rectify
as
under
item 5
Check and
rectify
as under ite 3
Renew
thermostat
Remove restrictions
or
renew
compone
t s
Check
and
rectify by
adjustIl
e
nt or renewal of
components
Remedy
Clean out
or
renew
radtator
core
Clean and
flusl engine
water
jacket
and
add
rust
inhibitor to cool nt
Renew or
adjust
fan bell
Overhaul Qr
ren w
water
pump
renew
tp
e mostat
Check and renew lower nidiator
hose
and
check
radiator
core
tllbes
Repleni r
coola ll
33
ProCarManuals.com