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9-2
PART
9·1
GENERAL IGNITION SYSTEM SERVICE
Section
1 Diagnosis and Testing
General
Information
Page
9-2
9-2
Section
Spark Plugs
......
Ignition System Tests-Conventional
Resistance Wire Replacement
3
Cleaning and Inspection
Spark Plugs
Distributors
Pare
9-10
9-10
9-
10
9- 10
9- 10
9-12
9-12
9-12
9-12
9-12
Test Equipment
.
Distributor Checks
Di~tributor
Tests-Dwell Tester
Distributor
Tests-Distributor Tester
9-3
9-5
9-5
9-5
9-7
9-7
9-8
9-9
Secondary Wiring
Coil
2 Common Adjustments and Repairs
Breaker Points and Condenser
..
Ignition Timing
Spark Plug Wire Replacement
This part covers ignitioh system
description and operation, general
ignition
system
diagnosis, tests, ad-
justments and repair operations. In
addition, the cleaning and inspection
procedures are covered.
For distributor removal, disassem-
bly, assembly, installation, major
repair procedures and specifications,
refer to the pertinent part of this
group.
The distributor identification num-
Distributor Cap
Rotor
....
......
.
....
..
Distributor Vacuum Advance Control Valve
ber is stamped on the distributor
body. The basic part number for
Motorcraft 351 distributors is 12127
and for Bosch 351, 302, 250
&
200
distributors is 12100.
To procure replacement parts it is
necessary to know the
complete
part
number.
In addition, Bosch distributors
can be identified by their diaphragm
colour coding as follows:
200
C.I.D.
H.C. Blue, L.C. Black,
L.L.C. Yellow.
250 C.I.D. H.C. Red, L.C. White
.
250 C.I.D. 2V Green.
302 C.I.D. Manual
&
·
Auto Red.
351 C.I.D. 2V Auto Yellow.
A majority of the parts used in the
Bosch distributor are not inter-
changeable with earlier models.
Always refer to the Master Parts
Catalogue for parts usage and inter-
changeability before replacing a dis-
tribqtor or a component part for a
distributor.
D
DIAGNOSIS AND TESTING
GENERAL INFORMATION
The ignition system consists of a
primary (low
voltage)
and a second-
ary
(high voltage)
circuit (Fig. 1).
The primary circuit consists of the:
1. Battery.
2. Ignition
switch.
3. Primary circuit resistance wire.
4. Primary windings of the igni-
tion coil.
5. Breaker points.
6. Condenser.
The secondary citcuit consists of
the:
1. Secondary windings of the
ignition coil.
2. Distributor rotor.
3. Distributor cap.
4. High tension wires.
5. Spark plugs.
When
the
breaker
points
are
closed, the primary or low voltage
current
flows
from
the
battery
throug~
the ignition switch to the
primary windings in the coil. then to
BATTERY
-PRIMARY CIRCUIT
•••••• ~ECONOARY CIRCUIT
FIG. 1 -Typical Ignition System Circuit
SPARK PlUG
•
••••••
•
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