Chapter 2 Tune Up - Datsun 1973 510 Repair Manual

7AAJ
Tune
Up
and
Troubleshooting
The
followmg procedures
are
specific
ones
for
your
Datsun At the
back of the
chapter
there
IS a
general
Tune
Up
section
along
With
a
Troubleshootmg
sectIOn to
help
you
should the
car
need
more
than
a
regular
tune up
Tune
Up
Procedures
The
followmg procedures
Will show
you
exactly
how
to tune your
Datsun
Datsun
recommends
a
tune up
mclud
mg
pomts and
plugs at
12 000
mile
m
tervals If
you
re
expenencmg
some
spe
Cific
problem turn to
the Trouble
shootmg
section at
the end of the
chapter
and follow the
programmed
for
mat
until
you
pmpomt the trouble If
you
re
just
domg
a
tune up to restore
your
Datsun
s pep
and
economy
pro
ceed With the followmg
steps
It
might
be noted that the
tune up
IS a
good
time
to
take
a
look around the
engme
compartment for
begmnmg prob
lems and head them off before
they
get
expensive
Look for 011 and fuel leaks de
tenoratlng radiator
or
heater hoses loose
and
or
frayed
fan belt
etc
These httle
Items
have the
tendency to develop mto
major
headaches
so
don
t
overlook
any
thmg
w
At
i
t
1
i
I
A
or
r
AI
r
l
d
r
J
Pull
on
the
spark
plug boot
not
the
wne
SPARK PLUGS
A
typical spark plug consists
of
a
metal
shell
surroundmg
a ceramic
msulator
A
metal
electrode extends
downward
through
the
center
of the msulator and
protrudes
a
small
distance
Located
at
the
end of the plug
and attached
to
the Side of
the
outer
metal shell
IS
the Side elec
trode The Side electrode bends
m
at
a
90
degree angle
so
that
ItS
tip IS even
With
and parallel
to
the tip of the
center
elec
trode
The
distance between these
two
electrodes
measured
m
thousandths of
an
mch
IS
called the
spark plug
gap
The
spark plug
m
no
way
produces
a
spark
but
merely
proVides
a
gap
across
whICh
the
current
can
arc
The COlI
produces
anywhere
from
20 000
to
40 000
volts
whICh travels
to
the dlstnbutor where
It
IS
dlstnbuted
through
the
spark
plug
wires
to
the
spark plugs
The
current
passes
along
the
center
electrode and
17