Comanche 4WD L4-150 2.5L VIN H TBI (1986)
Flex Plate: Technical Service Bulletins
Flex Plate - Trigger Wheel Service
JULY 1986 001 060
1986 JEEP MODELS WITH 2.46L ENGINE AND AUTOMATIC TRANSMISSION
47E
ENGINES Attention:
Workshop, Parts Department
FLEX PLATE TRIGGER WHEEL SERVICE
On Jeep models with a 2.46L engine and automatic transmission the trigger wheel portion of the flex plate assembly provides the timing signal for the
fuel and ignition systems.
If the trigger wheel becomes damaged when removing/installing the engine, transmission, or torque convertor, ignition performance will be affected. The
general result is either rough engine operation and backfire, or a no-start condition.
Trigger Wheel and Timing Slot Separator Location
Check for suspected trigger wheel damage as follows:
^
Check trigger wheel radial runout on inner surface (A) with a dial indicator. Maximum allowable runout is 0.40 mm (0.016 in). Replace the flex
plate assembly if runout exceeds this figure.
^
Inspect condition of the timing slot separators
(B)
in the trigger wheel. Replace the flex plate assembly if the separators are dented, distorted, broken, or bent. Do not attempt to repair the wheel
as the results are usually not satisfactory.
^
Inspect the starter ring gear for damage. Replace the flex plate assembly if the ring gear is loose or the teeth are damaged.
FILING INSTRUCTIONS
File this I.S. NOTE in the M.R. 171 binder.
