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PART
9-1- GENERAL IGNITION SY.STEM SERVICE
9-5
secondary wires are probably satis-
factory.
If
the spark is good at only some
wires, check the resistance of the
faulty leads.
If the spark is equal at all wires,
but weak or intermittent, check the
coil, distributor cap and the coil to
distributor high tension wire.
Spark Plugs
Inspect, clean and gap the plugs
following the instructions in sections
2 and 3. After the proper gap is ob-
tained, check the plugs on a testing
machine. Compare the sparking ef-
ficiency of the cleaned and gapped
plug with a new plug. Replace the
piug if it fails to meet
70%
of the
new plug performance.
Test the plugs for compression
leakage at the insulator seal. Apply a
coating of oil to the shoulder of the
plug where the insulator projects
through the shell, and to the top of
the plug, where the center electrode
and terminal project from the insula-
tor. Place the spark plug under pres-
sure with the tester's high tension
wire removed from the spark plug.
LeakJge is indicated by air bubbling
through the oil.
If
the test indicates
compression leakage, replace the
plug.
If
the plug is satisfactory, wipe
it clean.
Ignition Timing
Incorrect ignition timing can be
caused by:
1. Timing incorrectly adjusted.
2. Distributor
bushing
and/ or
shaft worn, or a bent distributor
shaft.
3. Defective vacuum advance sys-
tem.
4. Defective centrifugal advance
system.
DISTRIIUTOR CHICKS
Dual Advance Distributor
1. Remove the distributor from
the engine.
2. Place the distributor in the hold-
ing tool and clamp it in a vise with
the gear end
up.
3. Push the distributor shaft up-
ward as far as it will go, and check
the end play with a feeler aauae
placed between the collar and the dis-
tributor base. The end play should be
within the specified limits.
DISTRIBUTOR TISTI--
DWELL TESTER
TEST CONNECTIONS
1. Connect the red lead to the dis-
tributor terminal of the coil.
2. Connect the black lead to a
good around on the engine.
DWELL ANGLE CHECK
1. Connect the tester.
2. Turn the test control knob to
the set position.
3, Adjust the set control knob un-
til the needle on the dwell meter lines
up with the set line.
4. Start the engine and let it idle.
5. Turn the test control knob to
the 8 CYL position for eight cylinder
engines or to the 6 CYL position for
6 cylinder engines.
6. Read the dwell angle on the
dwell meter and compare the reading
to specifications.
7. Turn off the engine.
8.
If
the dwell angle was below the
specified amount, the breaker point
gap is too large. If the dwell angle
was above the specified amount, the
breaker point gap is too small.
If the dwell is to specifications,
turn the test selector knob to the
OFF position and disconnect the
tester leads.
DWELL ANGLE
ADJUSTMENT
If the dwell angle is not within
specifications, proceed as follows:
1.
Remove the coil high tension
lead from the distributor and ground
it.
2. Remove the distributor cap and
place it out of the way.
3. Disconnect the
·
brown wire (I
terminal) and the red and blue wire
(S terminal) from the starter relay.
4. Loosen the breaker point as-
sembly retaining screw near the
breaker point contacts.
5.
With the ignition on,
crank
the
engine with an auxiliary starter
switch connected between the battery
and S terminals of the starter relay
and adjust the gap to specifications.
6.
Release the auxiliary starter
switch and tighten the breaker point
assembly retaining screw.
7.
Since the adjustment may have
changed when the retaining screw
was tightened, crank the engine again
with the auxiliary starter switch and
check the dwell.
DISTRIBUTOR TESTS -
DISTRIBUTOR TESTERS
MOUNTING DISTRIBUTOR
Set up the distributor in accor-
dance with the manufacturer's in-
structions.
Bosch distributors fitted to Falcon
engines have only one bearing in the
distributor housing. When phasing
and
cam
angle testing these dis-
tributors a lower bearing must be
provided. As a variety of test benches
are available it is impossible to release
a common bearing and bracket as an
essential tool.
The sketch and dimensions (Fig.
6) will enable manufacture of a bear-
ing and support which can be adapted
to suit individual test
benches.
FIG. 6 -
Iosch Distributor Supports
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