GMC 1976 ZEO 6083 Maintenance Manual page 438

6Y- 5 8
ENGINE ELECTRICAL
3. Reinstall wiring harness assembly with from-
met in distributor housing notch. Engage plastic wir-
ing insulator to housing.
4. Attach lead wire from wiring harness to
capacitator, if disassembled . Install capacitator and
bracket securing ground wire from wiring harness
with capacitator attaching screw.
NOTE :
Lead wire attaching to capacitator is a
fusible link .
5. Install module with two attaching screws .
NOTE:
Apply a layer of special silicone lubricant
between module and housing to improve heat
transfer .
Lubricant is included with new
modules. If installing a new module, be sure part
number is correct for this particular distributor .
6. Install vacuum advance unit, pin side up, with
two attaching screws .
7. Position pole piece and plate assembly with
arm over pin of vacuum advance unit .
%
NOTE :
If arm of pole piece and plate assembly is
not properly installed on pin of vacuum advance
unit, the arm can float and cause timing to vary .
If installing a new pole piece and plate assembly,
be sure part number is correct for this particular
distributor .
8. Install retainer to secure position of pole piece
and plate assembly .
9. Install connector to "B" and "C" terminals on
module with tab on top. Connect green wire to "G"
terminal and white wire to"W" terminal .
10 . Install distributor shift and rotate to check for
even clearance all around between teeth on pick-up
coil of pole piece and plate assembly and teeth on
distributor shaft .
NOTE :
If necessary to adjust for proper clear-
ance, loosen three screws on pole piece and plate
assembly . Move pole piece teeth to provide even
clearance. Tighten three screws (figure 62).
11 . Install washers between gear and housing, if
distributor is so equipped . Slide gear onto shaft in
same position as marked when removed.
12 . Install roll pin into gear and shaft.
NOTE:
To prevent damage to the permanent
magnet in the pole piece and plate assembly,
support the driven gear when installing the roll
pin.
13 . If removed, carefully reassemble advance
weights and springs on advance weight plate.
14 . Position rotor to advance weight plate and
tighten retaining screws .
15 . Position cap on housing making sure cap is
properly seated (notch in housing matches tab in
cap) . Engage four locking latches.
IGNITION COIL REMOVAL
1 . Disconnect battery, ground cable from au-
tomotive battery and harness connector from dis-
tributor cap.
2. Remove three screws securing coil cover to
distributor cap.
3 . Remove four screws securing ignition coil to
distributor cap (figure 63).
4. Remove ground wire from coil, if coil is
equipped with ground wire .
5 . Push coil leads from underside of connectors
and remove ignition coil from distributor cap.
6. Check condition of seal and resistor brush
(spring and button) (figure 64).
NOTE :
Do not wipe silicone lubricant from seal .
IGNITION COIL INSTALLATION
1 . Position resistor brush (spring and button) and
seal in distributor cap.
NOTE :
Make sure seal is coated with silicone
lubricant and properly positioned in place.
2. Position coil into distributor cap with termi-
nals over connector at side of cap.
NOTE :
If replacing ignition coil, be sure part
number is correct.
3. Push coil lead wires into connector on side of
cap.
4. Secure ignition coil with four screws . Place
ground wire, if so equipped, under coil mounting
screw.
5 . Install coil cover onto distributor cap and se-
cure with three screws .