Ignition Control Module Used On V6 Models; Trigger Wheel And/Or Pickup Coil Assembly-Removal And Installation; Vacuum Advance Mechanism-Check And Replacement; Exploded View Of The Distributor Assembly-Cylinder Engines - Jeep cherokee 1989 Owner's Manual

5-4
8.4 lgnition control module used on V6 models
1 Pickup coil assembly
2 Module attaching screws
4
Remove the t w o module attaching screws (see illustration) and
lift the module up.
5 Detach the pickup coil wire connector from the module (see illustra-
tion 8.41. Note the wire colors
changed.
6
Disconnect the wire harness connector.
7 If you will be reinstalling the old module, don't wipe the grease
from the module or the distributor base. If you install a new module,
a package of silicone dielectric compound will be included with
Spread the compound on the metal face of the module and on the
distributor base where the module seats. This compound is necessary
for module insulation and cooling.
8 lnstallation is the reverse of removal.
9 Remove the ignition coil (see Section 7).
10 Remove the t w o screws that attach the module to the coil frame.
Pull off the module.
11 lnstallation is the reverse of removal.
9 Trigger wheel and/or pickup coil assembly
installation (1984 and 1985 four-cylinder models only)
Refer to illustration 9.5
Removal
1
Detach the cable from the negative battery terminal.
2
The following procedure may be easier if you remove the distribu-
tor (see Section 13) but it's not absolutely necessary that you do so.
3 If you do decide to remove the distributor, place it in a bench vise.
4
Remove the distributor cap and rotor (see Chapter 1).
5
Using the trigger wheel puller tool (J-28509 or equivalent), remove
the trigger wheel (see illustration). Use a flat washer to prevent the
puller from contacting the inner shaft. Remove the pin.
6 Remove the pickup coil assembly retainer and washers from the
pivot pin on the base plate.
7 Remove the two pickup coil plate screws.
8
Lift the pickup coil assembly from the distributor housing.
Installation
9 Position the pickup coil assembly into the distributor housing.
1 0 Make sure the pin on the pickup coil assembly fits into the hole
in the vacuum advance mechanism link.
1 1 Install the washers and retainer on the pivot pin to secure the pickup
coil assembly to the base plate.
12 Position the wiring harness in the slot in the distributor housing.
lnstall the t w o pickup coil plate screws and tighten them securely.
13 Install the trigger wheel on the shaft with hand pressure. The long
portion of the teeth must face up. When the trigger wheel and slot
in the shaft are properly aligned, use a pin punch and a small hammer
to tap the pin into the locating groove in the trigger wheel and shaft.
The Motor Manual Guy
Chapter 5 Engine electrical systems
3 Ignition control module
4 Pickup coil connector
-
the connectors must not be inter-
- -
-
removal and
If the distributor is not installed in the engine, support the shaft while
installing the trigger wheel pin.
1 4 lnstall the rotor and the distributor cap.
15 Attach the cable to the negative battery terminal.
1 0 Vacuum advance mechanism
replacement (1984 and 1 9 8 5 four-cylinder models only)
Check
1
Hook up a timing light in accordance with the manufacturer's
instructions.
2 Make sure the vacuum hose is attached to the vacuum advance
mechanism (see illustration
Run the engine until it reaches normal operating temperature.
3
4 With the engine idling, watch the timing marks at the front of the
engine with the timing light (see Chapter 1 for more information). Note:
The white paint mark on the timing degree scale identifies the specified
timing degrees Before Top Dead Center (BTDCI at 1600 rprn; it does
not identify TDC.
5 Slowly increase the engine speed to 2000 rpm, noticing how
quickly the ignition timing advances. Disconnect and plug the vacuum
hose from the vacuum advance mechanism. Again, increase the engine
speed to 2000 RPM and notice how quickly the ignition timing advances.
With the hose connected, the ignition timing should advance more
quickly than it does with the hose disconnected. If it doesn't, replace
the vacuum advance mechanism. Note: A defective Micro Computer
Unit (MCU) can also alter ignition timing.
6
Unplug and reconnect the hose to the vacuum advance mechanism.
it.
9.5 Exploded view of the distributor assembly used on
1 9 8 4 and 1985 four-cylinder engines
2
Gear
3 Washer
4 Distributor body
5
Vacuum advance
mechanism
6
Wick
check and
9.5).
7
Washers
8 Pickup coil
9 Pickup coil retainer
10 Trigger wheel
13 Cap