Datsun 510 Workshop Manual page 20

IlainteDance
TUDe
up
Condition
Owrheating
Owen ooling
Othen
NOISY ENGINE
Car
knodting
Mechmicll kncdtinll
Crankshaft
bearing
knocking
Connecting rod
bearing knocking
Piston and
cylinder
noise
18
Probable
cause
Insufficient coolant
Loose fan belt
Worn
or
defective fanbelt
Defective thermostat
Defective
water pump
Oogged
or
leaky
radiator
Defective radiator mlct cap
Air in
cooling
system
Improper
e e
oil
grade
Incorrect ignition
timing
Defective carburetor
lean
mixture
Defective thermostat
Improper
octane fuel
Improper
tire pressure
Dragging
brake
Clutch
dipping
Overloaded
engine
Carbon
knocking
Timing knocking
Fuel
knocking
Preignition misusing
of spark plug
ThU
strong dull
noise increases
when
engine
is accelerated To locate the
place cause a
misflTe
on
each cylinder If the
noise
stop3
by
the misfut this
cylinder
generates
the
noise
This is
a
little
hisher pitched n9ise
than
the
crankshaft
knocking
and also
increases
when
engine
is accelerated
Cause
a
misfue
on
each
cylinder
and if the noise deminiwi
almost
completely
this
crankshaft
bearing
generates
the noise
When you hear
an
overlapping
metalic noise
which
increases its
magnitude
with the
revolution of enaine and which decreases
u
engiI e
is warmed up this noi3e is caused
by
piston
and
cylinder
To locate the
place
cause
a
misfue
on
each
cylinder
Corrective action
ReplenWt
Adjust
fan belt
Replace
Replace
Replace
Flush
repair or
replace
Replace
Retighten
each
part
of
cooling
system
Replace
with proper
grade
oil
Adjust
Overhaul carburetor
Replace
Repbce
with
specified octane
fuel
Inflate to
specifted
pressure
Adjust
Adjust
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
uneyen
y worn
crankshaft Renew
bearinp and adjust
or
change crankshaft
Check lubrication
system
Same
as
the
case
of crankshaft
bearinas
This
may
cause an
abnormal
wearing
of
cylinder
and lower
compression
which in
turn will
cause I
lower out
put
power
and
excessive
consumption
of oil
erhaul
engine