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-   -   Distributor removal / installation 4.0L & 2.5L (http://www.jeepforum.com/forum/f12/distributor-removal-installation-4-0l-2-5l-1173859/)

Straycur 02-26-2011 11:03 AM

Distributor removal / installation 4.0L & 2.5L
 
I see a lot of questions about distributors and timing. The below directions are from allexperts.com and mirror the FSM.
As noted below, the position of the distributor determines fuel synchronization only. It does not determine ignition timing, all ignition timing requirements are handled by the powertrain control module (PCM)





DISTRIBUTOR
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.

REMOVAL - 2.5L OR 4.0L ENGINE
1.Disconnect negative battery cable at battery.
2.Disconnect coil secondary cable at coil.
3.Remove distributor cap from distributor (2 screws) Do not remove cables from cap. Do not remove rotor.
4.Disconnect distributor wiring harness from main engine harness.
5.Remove cylinder number 1 spark plug.
6.Hold a finger over open spark plug hole. Rotate engine at vibration dampener bolt until compression (pressure) is felt.
7.Slowly continue to rotate engine. Do this until timing index mark on vibration damper pulley aligns with top dead center (TDC) mark (0 degree) on timing degree scale Align Timing Marks Always rotate engine in direction of normal rotation. Do not rotate engine backward to align timing marks.
8.On models equipped with A/C, remove electrical cooling fan and shroud assembly from radiator. Refer toCooling System for procedures.
9.This will provide room to turn engine crankshaft with a socket and ratchet using vibration damper bolt
10.Remove distributor holddown bolt and clamp.
11.Remove distributor from engine by slowly lifting straight up.
12.Note that rotor will rotate slightly in a counterclockwise direction while lifting up distributor. The oil pump gear will also rotate slightly in a counterclockwise direction while lifting up distributor. This is due to the helical cut gears on distributor and camshaft.
13.Note removed position of rotor during distributor removal. During installation, this will be referred to as the Pre-position.
14.2.5L 4-Cylinder Engine: Observe slot in oil pump gear through hole on side of engine. It should be slightly before (counterclockwise of) 10 o'clock position Slot At 10 Oclock Position - 2.5L Engine
15.4.0L 6-Cylinder Engine: Observe slot in oil pump gear through hole on side of engine. It should be slightly before (counterclockwise of) 11 o'clock position Slot At 11 Oclock Position - 4.0L Engine
16.Remove and discard the old distributor-to-engine block gasket.
INSTALLATION
1.If engine crankshaft has been rotated after distributor removal, cylinder number 1 must be returned to its proper firing stroke. Refer to previous REMOVAL Step 5 and Step 6. These steps must be done before installing distributor.
2.Check position of slot on oil pump gear. On the 2.5L engine, it should be just slightly before (counterclockwise of) 10 o'clock position Slot At 10 Oclock Position - 2.5L Engine On the 4.0L engine, it should be just slightly before (counterclockwise of) 11 o'clock position Slot At 11 Oclock Position - 4.0L Engine If not, place a flat blade screwdriver into oil pump gear and rotate it into proper position.
3.Factory replacement distributors are equipped with a plastic alignment pin already installed Plastic Alignment Pin This pin is used to temporarily hold rotor to cylinder number 1 firing position during distributor installation. If pin is in place, proceed to Step 8. If not, proceed to next step.
4.If original distributor is to be reinstalled, such as during engine overhaul, the plastic pin will not be available. A 3/16 inch drift pin punch tool may be substituted for plastic pin.
5.Remove camshaft position sensor from distributor housing. Lift straight up.
6.Four different alignment holes are provided on plastic ring Pin Alignment Holes Note that 2.5L and 4.0L engines have different alignment holes Pin Alignment Holes
7.Rotate distributor shaft and install pin punch tool through proper alignment hole in plastic ring Pin Alignment Holes and into mating access hole in distributor housing. This will prevent distributor shaft and rotor from rotating
8.Clean distributor mounting hole area of engine block.
9.Install new distributor-to-engine block gasket Distributor - 2.5L Or 4.0L Engines - Typical
10.Install rotor to distributor shaft.
11.2.5L 4-Cylinder Engine: Pre-position distributor into engine while holding centerline of base slot in 1 o'clock position Distributor Pre-position - All Engines Continue to engage distributor into engine. The rotor and distributor will rotate clockwise during installation. This is due to the helical cut gears on distributor and camshaft. When distributor is fully seated to engine block, the centerline of base slot should be aligned to clamp bolt mounting hole on engine Distributor Engaged Position - 2.5L 4-Cylinder Engine The rotor should also be pointed slightly past (clockwise of) 3 o'clock position.
4.0L 6-Cylinder Engine: Pre-position distributor into engine while holding centerline of base slot in 1 o'clock position Distributor Pre-position - All Engines Continue to engage distributor into engine. The rotor and distributor will rotate clockwise during installation. This is due to the helical cut gears on distributor and camshaft. When distributor is fully seated to engine block, the centerline of base slot should be aligned to clamp bolt mounting hole on engine Distributor Engaged Position - 4.0L 6-Cylinder Engine The rotor should also be pointed at 5 o'clock position.

It may be necessary to rotate rotor and distributor shaft (very slightly) to engage distributor shaft with slot in oil pump gear. The same may have to be done to engage distributor gear with camshaft gear

The distributor is correctly installed when:

•rotor is pointed at 3 o'clock position (2.5L engine), or at 5 o'clock position (4.0L engine)
•plastic alignment pin (or pin punch tool) is still installed to distributor.
•number 1 cylinder piston is set at top dead center (TDC) (compression stroke)
•centerline of slot at base of distributor is aligned to centerline of distributor holddown bolt hole on engine. In this position, the holddown bolt should easily pass through slot and into engine.
No adjustments are necessary. Proceed to next step.

1.Install distributor holddown clamp and bolt. Tighten bolt to 23 N·m (17 ft. lbs.) torque.
2.Remove pin punch tool from distributor. Or, if plastic alignment pin was used, remove it straight down from bottom of distributor. Discard plastic pin.
3.If removed, install camshaft position sensor to distributor. Align wiring harness grommet to notch in distributor housing.
4.Install rotor
CAUTION: If the distributor cap is incorrectly positioned on distributor housing, cap or rotor may be damaged when engine is started.

5.Install distributor cap. Tighten distributor cap holddown screws to 3 N·m (26 in. lbs.) torque.
6.If removed, install spark plug cables to distributor cap. For proper firing order, refer to Specifications section at the end of this group. See Engine Firing Order.
7.Connect distributor wiring harness to main engine harness.
8.Connect battery cable to battery.

matt_bennett33 05-12-2013 09:41 PM

My 98 2.5L tj started cutting out today then finally would not run. Came to find that my distributor had been rotating. Can twist it with my hand easily and when attempting to start it the distributor rotates to the left and right which would then adjust timing obviously, therefore causing the motor to cut out or chug slowly. Can not figure out how to tighten this or stop my distributing from dancing around. Anyone know how to solve this ?

Que89YJ 05-13-2013 08:27 AM

http://www.jeepforum.com/forum/f12/3...roblem-507513/


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