Chevrolet 10 Series 1970 Service Manual page 426

ENGINE-ELECTRICAL 6Y-34
P o w e rm a tic tran sm issions maximum under full load con­
ditions) the cen trifu gally
clo se, thus applying a vacuum on the carb u retor actuator
diaphragm which in turn acts to close the throttle valves.
The overspeed warning system vacuum switch, being in
the spinner go vern or vacuum line, also senses the v a c ­
uum applied when governed speed is reached and acts to
close the circ u it to the battery thus lighting the am ber
warning lamp. The lamp burnout checking circu it con­
sists o f a "n o r m a lly c lo s e d " engine o il p ressu re switch
DISTRIBUTOR
SPINNER VALVE
General D es crip tio n ..............................................................................
Maintenance and A d ju stm e n ts............................................................
Lubrication .......................................................................................
Resistance Checks ............................................................................
The function o f the starting system , composed o f the
starting m otor, solenoid and battery, is to crank the
engine. The battery supplies the e le c tric a l energy, the
solenoid com pletes the circu it to the starting m otor, and
the m otor then does the actual work of cranking the
engine.
operated spinner valve w ill
LAMP BURN-OUT CHECKING CIRCUIT
IG N IT IO N
SWITCH
ENGINE OVER-SPEED WARNING SYSTEM
F ig . 2 2 i—Engine O verspeed W a rn in g System
STARTING SYSTEM
Page
6Y-34
6Y-35
6Y-35
6Y-35
GENERAL DESCRIPTION
which com pletes the circu it from the battery, through the
warning light, ignition switch and the o il p ressu re switch
its e lf, and back to ground. The warning ligh t should light
up when the ignition switch is turned " O N " but the engine
is " O F F " . When the engine is started the o il pressu re
opens the switch, breaking the checking circu it.
warning light w ill then go out and rem ain out until such
tim e as the engine reaches its predeterm ined governed
speed. Thus the d riv e r has a quick check o f the condition
o f the warning light bulb.
CARBURETOR ACTUATOR
S ~
OIL PRESSURE
SWITCH
INDEX
Starting M otor and Solenoid Checks
Service O p e ra tio n s................................................................................
Rem oval and In s ta lla tio n ................................................................
The starting m otor (fig. Is ) consists p rim a r ily of the
d riv e mechanism, fram e, arm ature, brushes, and field
windings. The starting
fra m e type, having four pole shoes and four field s, con­
nected with the arm ature. The aluminum d riv e end hous­
ing is extended to enclose the entire
CARBURETOR
BUTTERFLY VALVE
BATTERY
............................................
m otor is a 12-volt extruded
shift le v e r and
CHEVROLET TRUCK SERVICE MANUAL
The
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6Y-37
6Y-37