Chevrolet 10 1971 Series, Chassis Service Manual

Page: 263 / 466

ENGINE-ELECTRICAL 6Y-13
NOTE:
This gives us a variable resistance in
series from a hot lead to the relay coil.
2. Turn resistor to “ open” position.
3. Turn ignition switch off.
4. Slowly decrease resistance and note closing voltage
of the relay. Adjust by bending heel iron in the man­
ner illustrated in Figure 10c.
Other Harness Checks
Other wires in the charging system harness need be
checked for continuity by use of an ohmmeter or a test
light (12 Volt). Connect the test lamp so the wire in
question is in series in the test circuit.
Fig. 10c-Adjusting Field Relay Closing Voltage
CO M PONENT PART REPLACEMENT
GENERATOR PULLEY REPLACEMENT
Single Groove Pulley
1. Place 15/16” box wrench on retaining nut and insert
5/16” alien wrench into shaft to hold shaft while
removing nut (fig. 11c).
2. Remove washer and slide pulley fan and spacer from
shaft.
3. Reverse Steps 1 and 2 to install, use a torque wrench
with a craw-foot adapter (instead of box wrench)
and torque the nut to 50 ft. lbs. (fig. 12c).
Double Groove Pulley
1. Place a 15/16” socket (with wrench flats on the drive
end or use Adapter J-21501 and a box wrench) on
retaining nut, insert a 5/16” alien wrench through
socket and adapter into hex on shaft to hold the shaft
while removing the nut.
2. Remove washer and slide pulley fan and spacer from
shaft.
3. To install, slide fan, spacer, pulley and washer on
shaft and start the nut.
4. Use the socket and adapter with a torque wrench and
tighten nut to 50 ft. lbs. torque.
15/16
SOCKET
ADAPTER
5 /1 6 ALLEN
Fig. l i e — Pulley Removal
Fia. 12c-Torquing Pulley N u t
10-30 CHEVROLET TRUCK SERVICE MANUAL