Chevrolet 30 Series 1967 Service Manual page 366

ENGINE—ELECTRICAL 6Y-18
General D e s c r ip tio n ............
Maintenance and Adjustments
Periodic Maintenance. . . .
Breaker Point System . .
Breakerless System . . .
Ignition Coil Check . . . .
Spark Plugs .....................
C a b le s ..............................
Governor ........................
Service O perations...............
Distributor Contact Points .
Cleaning.................. . . .
Replacement.....................
Setting Dwell Angle . . . .
Distributor Condenser . . .
Performance Diagnosis . .
R e p la c e m e n t..................
Distributor
Breaker Point Type . . . .
F ig . l i —M agnetic Pulse Distributor
IGNITION
INDEX
Page
............... 6Y-18 R em oval........................................................................ 6Y-23
............... 6Y-19 Disassem bly.................................................................. 6Y-24
............... 6Y-19 Cleaning and In sp ectio n .......................................... ... 6Y-25
............... 6Y-19 A s s e m b ly ..................................................................... 6Y-26
............... 6Y-19 Governor S e ttin g ......................................................... 6Y-28
. . .................6Y-19 Installation..................................................................... 6Y-28
. . .................6Y-19 Breakerless Type............................................................ 6Y-29
. . .................6Y-20 Rem oval........................................................................ 6Y-29
. . .................6Y-20 Disassem bly.................................................................. 6Y-29
. . .................6Y-20 In sta llatio n .................................................................. 6Y-30
. . .................6Y-20 Ignition Pulse A m p lifie r ................................................... 6Y-31
. . .................6Y-20 Disassembly..................................................................... 6Y-31
. . .................6Y-20 Component C h e c k s ......................................................... 6Y-31
. . .................6Y-22 Reassemble
. . .................6Y-23 Ignition Switch Replacem ent............................................. 6Y-32
. . .................6Y-23 Spark P lu g s ........................................................................ 6Y-32
.................. 6Y-23 Cleaning and R e g a p p in g ................................................ 6Y-32
In sta lla tio n ..................................................................... 6Y-33
.................. 6Y-23 Truck Engine Overspeed W arn in g.................................... 6Y-33
GENERAL DESCRIPTION
There are two ignition systems available on 1967
vehicles. The breaker point type which is continued as
the regular production system and the optional transis­
tor controlled breakless ignition system (magnetic pulse
type). The transistor ignition system features a specially
designed distributor, control unit (ignition pulse ampli­
fier), and a special coil. Two resistance wires are also
used in the circuit; one as a ballast between the coil
negative terminal and ground, while the other resistance
wire provides a voltage drop for the engine run circuit
and is by-passed at cranking. The other units in the
system (the ignition switch, spark plugs, and battery)
are of standard design. The distributor and control unit
(ignition pulse amplifier) are shown in Figures li and
i.
2
Although the external appearance of the distributor
resembles a standard distributor, the internal construc­
tion is quite different. As shown in the exploded view
(fig. 23i) an iron timer core replaces the conventional
breaker cam. The tim er core has the same number of
equally-spaced projections, or vanes as engine cylinders.
.................................................................. 6Y-32
F ig . 2i —Ignition Pulse A m p lifie r U nit
CHEVROLET TRUCK SERVICE M ANUAL
SYSTEMS
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