Chevrolet CHEVY VAN G10 SERIES Service Manual page 237

ENGINE ELECTRICAL 6Y-26
points in the cranking circuit as outlined below and observe
the reading w ith the starting sw itch closed and th e m o to r
cranking (d istrib u to r prim ary lead grounded to prevent engine
firing).
1. From b attery positive post to solenoid battery term inal.
2. From b a tte ry negative post to starting m oto r housing.
3. F rom solenoid b attery term inal to
term inal.
If voltage dro p is any o f above, check exceeds 0.2 volts,
excessive resistance is indicated in that portion o f starting
circuit and th e cause o f the excessive resistance could be
located and corrected in order to obtain m axim um efficiency
in the circuit.
C A U T IO N : Do not operate the starting m otor
continuously fo r more than 30 seconds to avoid
overheating.
When the solenoid fails to pull in, the tro uble m ay be due
to excessive voltage drop in the solenoid control circuit. To
check for this con ditio n , close th e starting sw itch and measure
th e voltage drop betw een th e BATTERY term inal o f the
solenoid an d the SWITCH (S) term inal o f the solenoid.
1. I f this voltage drop exceeds 3.5 volts, excessive resistance
in th e solenoid control circuit is indicated and should be
corrected.
2. I f th e voltage drop does n o t exceed 3.5 volts and the
solenoid does n o t pull in, measure th e voltage available at
th e SWITCH term inal o f the solenoid.
STARTER MOTOR
Removal and Installation
The follow ing procedure is a general guide for all vehicles
and will vary slightly depending o n the tru ck series and model.
1. D isconnect b attery ground cable at th e b attery .
2. D isconnect engine wiring harness and b attery leads at
solenoid term inals.
solenoid m otor
COMPONENT PART REPLACEMENT
3. If the solenoid does n o t feel w arm , it should pull in
whenever th e voltage available at the SWITCH term inal is
7.7 volts or m ore. When the solenoid feels w arm , it will
require a som ew hat higher voltage to pull in.
STARTING MOTOR AND SOLENOID CHECK
The following checks m ay be made if th e specific gravity o f
the b attery is 1.215 or higher.
1. If th e solenoid does n o t pull in, m easure the voltage
betw een the sw itch (S) term inal o f th e solenoid and
ground w ith the starting sw itch closed.
C A U T IO N : If the solenoid feels w arm , allow to
cool before checking.
If the voltage is less th an 7.7 volts, check for
excessive resistance in th e solenoid con tro l circuit. If the
voltage exceeds 7.7 volts, remove th e starting m o tor and
1
check ( ) solenoid current draw, (
pinion clearance, and (3) freedom o f shift lever linkage.
2. If th e solenoid " chatters" b u t does n o t hold in, check the
solenoid for an open " hold - in " winding. Whenever it is
necessary to replace a starting m o tor solenoid, always
check starting m oto r pinion clearance.
3. If m o to r engages b u t does n o t crank or cranks slowly,
check for excessive resistance in th e external starting
circuit, trouble w ithin the starting m o to r, or excessive
engine resistance to cranking.
N O T E : On some V -8 engine models it may be
necessary to remove mounting bolts and then dis­
connect wiring.
3. Remove starter m ounting bolts and retaining nuts and
disengage starter assembly from the flywheel housing.
4. Position starter m o tor assembly to the flywheel housing
and install th e m ounting bolts and retaining n uts. T orque
th e m ounting b olts 25-35 ft. lbs.
5. C onnect all wiring leads at the solenoid term inals.
6
. C onnect th e b attery ground cable and check operation o f
th e unit.
2
) starting m otor
C H E V Y V A N SH O P M A N U A L
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