Fiat X 1/9 1978 - Ignition; IGNITION DISTRIBUTOR

Ill-1974
Page
115
Section
No.
551.01
Ignition
IGNITION
DISTRIBUTOR
Check
automatic
centrifugal
advance.
Mount
distributor
on
test
bench.
Rotate
distributor
at
300
to
400
rpm.
Read
on
grad-
uated
disc
angle
at
which
one
of
the
sparks
occurs.
Gradually
increase
speed
and
take
readings
of
the
number
of
degrees
of
spark
advance.
Compare
findings
with
diagram.
1.
Distributor.
2.
Graduated
disc.
3.
Plug
for
disc.
4.
Stroboscopic
switch.
5.
Plug
for
distributor
breaker.
The
distributor
is
driven
at
one-half
engine
speed.
To
plot
advance
curve
double
both
rpm
and
advance
degrees.
Match
curve
against
diagram
shown
in
figure.
Check
distributor
contacts
openings
and
closing
angle:
—open-contact
angle
—
35°
1-
3"
—-dwell
(closed-contact)
angle
—
55°
1-
3“
Check
that
contact
gap
is
0.0145
to
0.0169
in.
(0.37
to
0.43mm).
Check
that
contact
pressure
is
15.9
i
1.8
oz.
(450
i
50
gr.).
Refer
to
General
Information
for
Ignition
Timing.
1.
Point
gap.
2.
Contact.
ADVANCE
DEGREES
VERSUS
ENGINE
N
l
U
on a
o
I
e
N
G
.
_.
_u
n
D.
.1000
900
1500
2000
3000
i000
5000
l”’00