Inspection; Cleaning And Regap; Trouble Shooting Ignition - Datsun 510 Workshop Manual

IlectricalSptem
Inspection
Remove
spark plug
wire
by pulling
on
boot
not
on
wire itself
Remove
spark plugs
Check
electrodes
and inner and
outer
por
celains of
plugs noting
the
type
of
deposits
and the
degree
of electrode erosion
Normal Brown
to grayish
tan deposits
and
slight electrode
wear
indicate correct
spark
plug
heat range
Carbon fouled Dry
fluffy
carbon
deposits
on
the insulator and
electrode
were
mostly
caused
by
slow
speed driving in city weak ig
nition
too
rich fuel mixture
dirty
air cleaner
etc
It is advisable
to replace
with
plugs having
hotter heat range
Oil fouled Wet black
deposits
show excessive
oil
entrance
into combustion 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
insulator
with black
or
gray brown
spots
and bluish
burnt electrodes indicate
engine overheating
Moreover
the appearance results from in
correct
ignition timing
loose
spark plugs
low
fuel
pump pressure
wrong selection of
fuel
a
hotter plug
etc
It is advisable
to
replace
with
plugs having
colder heat range
After
cleaning
dress electrodes with
a
small
fine file
to
flatten the surfaces of both
center
and side
electrodes
in
parallel
Set
spark plug
gap to
specification
Install
spark plugs
and
torque
each
plug
to 11
to
15 ft lb
Connect
spark pi
ug
wires
Cleaning
and
Regap
Clean spark plugs
in
a
sand blast type
cleaner
A void excessive
blasting
Clean and
remove
carbon
or
oxide
deposits
but do
not
wear away
porcelain
If
deposits
are
too
stub
born discard
plugs
Fig 104
Selling Spark Plug Gap
TROUBLE SHOOTING IGNITION
Spark length Trouble location Causes Remedies
No
sparks
at all Distributor Defective insulation of condenser
Replace
Breakage
of lead wire low tension ide
Repair
Defective insulation of cap and
rotor
head
Replace
Point does
at open
close
Repair
19nition coil Wire
breakage
short cuit of coil
Replace
with
new ne
High
tension cable Wire
coming off Repair
Defective
insulation
Replace
I
to
2
mm
0 0394 Distributor Point gap
too
wide Correcl
to
0 0787 in
or
Oil sticking
on
point
Clean
irregular
Point burnt
too
much
Replace
18