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2-03
Ignition System
2-03
RIMARY
WIRE
OM SWITCH
TO
" B" TERMINAL
JUMPE
c
FIG. 5
Battery-to-Coil
and Starting Ignition Circuit Test
Starting Ignition Circuit Voltmeter Test
1. Connect the voltmeter leads as shown in Figure 5.
:R
2.
Disconnect and ground the coil to distributor high tension lead
at the distributor.
3.
With the ignition switch off, crank the engine with an auxilia-
ry starter switch while observing the voltage drop.
4.
If the voltage drop is 0.4 volt or less, the starting ignition
circuit is satisfactory.
5.
If the voltage drop is greater than 0.4 volt, clean and tighten
the terminals in the circuit or replace the wiring as necessary.
Coil to Ground Voltmeter Test
1. Connect the voltmeter leads as shown in Figure 6.
FIG. 6
Coil to Ground Test
2.
Close the breaker point.
3.
Turn the ignition switch on.
4.
If the voltmeter reading is 0.25 volt or less, the primary circuit
from coil to ground is satisfactory.
5.
If the voltmeter
reading is greater than 0.25 volt, test the
voltage drop between each of the following:
* The coil and the breaker point connections
of the coil to
distributor primary wire.
* The movable breaker point and the breaker plate.
@ The breaker plate and the distributor housing.
0 The distributor housing and engine ground.
6.
Turn the ignition switch off. Disconnect the voltmeter leads.
Coil Test
Check the coil on a coil tester following
the manufacturer' s
instructions.
Check for ohms resistance, both primary and second-
ary . Also check the amperage draw both with the engine idling and
stopped, These checks should all fall within specifications.
Secondary (High Tension) Wires Resistance Test
The secondary wires include the wires connecting the distribu-
tor cap to the spark plugs and the wire connecting
the center
terminal of the distributor cap to the center terminal of the ignition
coil.
These wires are the radio resistance-type
which filter out the
high frequency electrical impulses that are the source of ignition
noise interference.
The resistance of each wire should not exceed
23,000 ohms. When checking the resistance of the wires or
setting ignition timing, do not puncture the wires with a probe.
The probe may cause a separation in the conductor.
When removing the wires from the spark plugs, grasp and twist
the moulded cap, then pull the cap off the spark plug by hand only.
Do not pull on the wire because the wire connection inside the cap
may become separated or the insulator may be damaged.
To check the spark intensity at the spark plugs, proceed as
follows:
1. Disconnect a spark plug wire. Check the spark intensity of
one wire at a time.
2.
Install a terminal adapter in the terminal of the wire to be
checked. Hold the adapter approximately
3/l 6 inch from the
exhaust manifold and crank the engine, using an auxiliary
starter switch. The spark should jump the gap regularly.
3.
If the spark intensity of all the wires is satisfactory,
the coil,
condenser,
rotor, distributor cap and the secondary wires are
probably satisfactory.
If the spark is good at only some wires, check the resistance of
those particular leads.
If the spark is equal at all wires, but weak or intermittent, check
the coil, distributor cap and the coil to distributor secondary (high
tension) wires.
Spark Plug Test
Inspect, clean, file the electrodes and gap the plugs. After the
proper gap is obtained,
check the plugs on a testing machine.
Compare the sparking efficiency of the cleaned and gapped plug
with a new plug. Replace the plug if it fails to meet 70 percent of
the new plug performance.
DISTRIBUTOR
TESTS -
ON ENGINE
Test Connections
1. Disconnect the distributor primary wire at the coil. Connect a
short jumper wire to the DIST terminal of the coil and the
distributor primary wire. Connect the red lead to the jumper
wire.
2.
Connect the black lead to a good ground on the engine.
- Quick Links:
- Basic Engine
- Specifications
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