All distributors contain an internal oil seal that prevents oil from entering the distributor housing. The seal is not serviceable.
Factory replacement distributors are equipped with a plastic alignment pin already installed. The pin is located in an access hole on the bottom of the distributor housing Plastic Alignment Pin It is used to temporarily lock the rotor to the cylinder number 1 position during installation. The pin must be removed after installing the distributor.
The camshaft position sensor is located in the distributor on all engines Distributor - 2.5L Or 4.0L Engines - Typical For removal/installation procedures, refer to Camshaft Position Sensor. Distributor removal is not necessary for sensor removal.
Refer to Distributor - 2.5L Or 4.0L Engines - Typical for an exploded view of the distributor.
A fork with a slot is supplied on the bottom of the distributor housing where the housing base seats against the engine block Distributor - 2.5L Or 4.0L Engines - Typical The centerline of the slot aligns with the distributor holddown bolt hole in the engine block. Because of the fork, the distributor cannot be rotated. Distributor rotation is not necessary as all ignition timing requirements are handled by the powertrain control module (PCM)
The position of the distributor determines fuel synchronization only. It does not determine ignition timing.
NOTE: Do not attempt to modify this fork to attain ignition timing.
4.0L 6-Cylinder Engine: Pre-position the distributor into the engine while holding the centerline of the base slot in the 1 o'clock position Distributor Pre-position - All Engines Continue to engage the distributor into the engine. The rotor and distributor will rotate clockwise during installation. This is due to the helical cut gears on the distributor and camshaft. When the distributor is fully seated to the engine block, the centerline of the base slot should be aligned to the clamp bolt mounting hole on the engine Distributor Engaged Position - 4.0L 6-Cylinder Engine The rotor should also be pointed at the 5 o'clock position.
It may be necessary to rotate the rotor and distributor shaft (very slightly) to engage the distributor shaft with the slot in the oil pump gear. The same may have to be done to engage the distributor gear with the camshaft gear.
The distributor is correctly installed when:
No adjustments are necessary. Proceed to next step.
CAUTION: If the distributor cap is incorrectly positioned on distributor housing, the cap or rotor may be damaged when engine is started.