Chevrolet 70 1969 Series, Shop Manual

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E N G IN E ELECTRICAL 6Y-9
Figure 15 — Circuit For C h e c k in g M o to r Free S p e e d
4. Position field frame on lever housing with match
m arks m ade prior to disassembly aligned. Install lever
housing to field frame attaching bolts and tighten to
13 to 17 foot-pounds torque.
5. Connect field leads to brush holders and place leather
brake washer on co m m u tato r end of arm ature shaft.
With match m arks aligned, position co m m utator end
frame on field frame and attach with bolts. Tighten
bolts evenly and firmly.
6. Install brush inspection plates and gaskets, or cover
band on field frame.
7. Connect field coil connector to solenoid “ m oto r” ter­
minal and connect lead to solenoid ground terminal.
8. Perform “ Pinion Clearance C heck” and “ Free Speed
C h eck ” described later in this manual.
P IN IO N C LE A R A N C E C H EC K
LIGHT-AND INTERMEDIATE-DUTY TYPE
The drive pinion clearance should be checked whenever
starter has been overhauled. There is no provision for ad ­
justing pinion clearance on light- and intermediate-duty
type starting motors. Clearance between end of pinion
and pinion stop (retainer) should be 0.010 inch to 0.140
inch with pinion in cranking position. Check clearance as
follows:
1. Connect a battery, of same voltage as the solenoid,
from the solenoid switch terminal to the solenoid
frame or ground terminal (fig. 12).
IMPORTANT: Make sure the motor field coil
connector is disconnected during this test.
2. Momentarily flash a ju m p er lead from the solenoid
“ m oto r” terminal to the solenoid frame or ground
terminal. The pinion will now shift into cranking posi­
tion and will remain there until the battery is discon­
nected.
3. Push the pinion back toward the co m m uta tor to elim­
inate slack movement.
4. Use a feeler gauge as shown in figure 13 to measure
clearance between pinion and pinion stop. If clearancc
is not within 0.010 inch to 0.140 inch, solenoid lin­
kage or shift lever yoke lugs may be worn excessively.
Disassemble and replace worn parts.
HEAVY-DUTY TYPE
1. Connect a battery, of same voltage as the solenoid,
from the solenoid switch terminal to the solenoid
frame or ground terminal (fig. 12).
2. Momentarily flash a ju m p er lead from solenoid
“ m o to r” terminal to solenoid frame or ground term i­
nal. The pinion will shift into cranking position and
remain there until battery is disconnected.
3. Press on clutch to eliminate slack movement, then use
a feeler gauge to measure distance between outer edge
of pinion and inner edge of nose housing (fig. 14).
4. If clearance is not within 23/64 - inch -1/32 - inch,
remove plug from lever housing and adjust clearance
by rotating nut clockwise to decrease clearance or
counterclockwise to increase clearance.
FREE SPEED C H ECK
(Refer to Figure 15)
The free-speed check is recom m ended after a starting
motor has been overhauled.
1. Connect a 12-volt battery in series with an am m eter
to “ battery” terminal of solenoid.
2. Connect a lead from frame of starting m otor to nega­
tive (-) post on battery.
3. Connect a vcltmeter to solenoid “ B A T ” terminal and
to ground on starting motor.
4 Connect a tachometer or an rpm indicator to the
starting motor.
5. Connect a jum per lead from “ battery” terminal to
solenoid switch terminal.
6. Observe am m eter, voltmeter and tachometer, and
compare readings with specifications.
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SH O P M A N U A L