GMC 1982 Light Duty Truck, Руководство по обслуживанию

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ENGINE ELECTRICAL 6 D -3 9
distributor must be INSTALLED with the rotor
correctly positioned as noted in Step 5.
If the engine was accidentally cranked after the
distributor was removed, the following procedure can be
used for installing:
a. Remove No. 1 spark plug.
b. Place finger over No. i spark plug hole and crank
engine slowly until compression is felt.
c. Align timing mark on pulley to "O " on engine
timing indicator.
d.Turn rotor to point between No. 1 and No. 8 spark
plug towers on distributor cap.
e. Install distributor and connect ignition feed wire.
f. Install distributor cap and spark plug wires.
Rotor
1. Remove distributor cap.
2. The rotor is retained by two screws and is provided with
a slot which fits over a square lug on the advance weight
base, so that the rotor can be installed in only on
position.
integral Ignition Coil (Refer to Fig. 6D-21D)
Removal
1. Remove distributor cap.
2. Remove three coil cover attaching screws, and lift off
cover.
3. Remove coil attaching screws and lift ignition coil and
lead from cap.
g. Check engine timing (see Set Ignition Timing
below).
Vacuum Advance Unit (Refer to Fig. 6D-21D)
Removal
1. Remove distributor cap and rotor.
2. Remove module.
3. Remove two vacuum advance attaching screws.
4. Turn the pick-up coil clockwise and push the rod end of
the vacuum advance down so that it will disengage and
clear the pick-up coil plate.
Installation
To install, reverse removal procedure.
Installation
To install, reverse removal procedure.
Capacitor
The capacitor is part of the coil wire harness assembly.
Since the capacitor is used only for radio noise suppression,
it will seldom need replacement.
Removal
1. Remove distributor cap and rotor.
2. Remove capacitor attaching screw, and unplug
connector from module, lt may help to loosen the
module.
Installation
1. To install, reverse above procedure.
2. Install hold down screw making sure ground lead is
under screw.
SET IG N IT IO N T IM IN G
1. Refer to the Vehicle Emissions Control Information
label located on the radiator support panel. Follow all
instructions on the label.
2. With ignition off, connect the pick-up lead of timing
light to the number one spark plug. Use a jumper lead
between the wire and plug or an inductive type pick-up.
DO NOT pierce the wire or attempt to insert a wire
between the boot and the wire. Connect the timing light
power leads according to manufacturer’s instructions.
3. Start the engine, and aim the timing light at the timing
mark (see Fig. 6D-25D). The line on the balancer or
pulley will line up at the timing mark. If a change is
necessary, loosen the distributor hold-down clamp bolt
at the base of the distributor. While observing the mark
with the timing light, slightly rotate the distributor
until the line indicates the correct timing. Tighten the
hold-down bolt, and re-check the timing.
4. Turn off the engine and remove the timing light.
Reconnect the number one spark plug wire, if removed.
SPARK PLUG WIRES
Use care when removing spark plug wire boots from
spark plugs. Twist the boot 1/2 turn before removing, and
pull on the boot only to remove the wire.
It is extremely important when replacing plug wires to
route the wires correctly and through the proper retainers.
Failure to route the wires properly can lead to radio ignition
noise and crossfiring of the plugs, or shorting of the leads to
ground.
Refer to Figure 6D-26D for proper spark plug wire
routing.