Dodge Dakota (R1). Manual — part 315
The distributor does not have built in centrifugal
or vacuum assisted advance. Base ignition timing
and all timing advance is controlled by the Power-
train Control Module (PCM). Because ignition timing
is controlled by the PCM, base ignition timing is
not adjustable on any of these engines.
All 2.5L/3.9L/5.9L distributors contain an internal
oil seal that prevents oil from entering the distribu-
tor housing. The seal is not serviceable.
REMOVAL - 2.5 L
The distributor contains 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 distrib-
utor housing (Fig. 9). It is used to temporarily lock
the rotor to the cylinder number 1 position during
installation. The pin must be removed after install-
ing distributor.
The camshaft position sensor is located in the dis-
tributor on all engines (Fig. 10). For removal/instal-
lation procedures, refer to Camshaft Position Sensor.
Distributor removal is not necessary for sensor
removal.
Refer to (Fig. 10) for an exploded view of the dis-
tributor.
A fork with a slot is supplied on the bottom of the
distributor housing where the housing base seats
against the engine block (Fig. 10). The centerline of
the slot aligns with the distributor holddown bolt
hole in the engine block. Because of the fork, the dis-
tributor 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 syn-
chronization only. It does not determine ignition tim-
ing.
NOTE: Do not attempt to modify this fork to attain
ignition timing.
(1) Disconnect negative battery cable at battery.
(2) Remove air tube between throttle body and air
cleaner housing.
(3) Disconnect coil secondary cable at coil.
(4) Remove distributor cap from distributor (2
screws). Do not remove cables from cap. Do not
remove rotor.
Fig. 9 Plastic Alignment Pin
1 - PLASTIC ALIGNMENT PIN
Fig. 10 Distributor—2.5L Engine—Typical
1 - CAP
2 - CAMSHAFT POSITION SENSOR
3 - HOUSING
4 - FORK WITH SLOT
5 - DRIVE GEAR
6 - ROLL PIN
7 - WASHER
8 - GASKET
9 - HOLDDOWN CLAMP
10 - HOLDDOWN BOLT
11 - SHAFT
12 - PULSE RING
13 - ROTOR
8I - 8
IGNITION CONTROL
AN
DISTRIBUTOR (Continued)
(5) Disconnect distributor wiring harness from
main engine harness.
(6) Remove cylinder number 1 spark plug.
(7) Hold a finger over open spark plug hole. Rotate
engine at vibration dampener bolt until compression
(pressure) is felt.
(8) 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 tim-
ing degree scale (Fig. 11). Always rotate engine in
direction of normal rotation. Do not rotate engine
backward to align timing marks.
(9) Remove distributor holddown bolt and clamp.
(10) Remove distributor from engine by slowly lift-
ing straight up.
(11) Note that rotor will rotate slightly in a coun-
terclockwise direction while lifting up distributor.
The oil pump gear will also rotate slightly in a coun-
terclockwise direction while lifting up distributor.
This is due to the helical cut gears on distributor and
camshaft.
(12) Note removed position of rotor during distrib-
utor
removal.
During
installation,
this
will
be
referred to as the Pre-position.
(13) Observe slot in oil pump gear through hole on
side of engine. It should be slightly before (counter-
clockwise of) 10 o’clock position (Fig. 12).
(14) Remove and discard the old distributor-to-en-
gine block gasket.
REMOVAL - 3.9L/5.2L/5.9L
CAUTION: Base ignition timing is not adjustable on
any engine. Distributors do not have built in centrif-
ugal or vacuum assisted advance. Base ignition
timing and timing advance are controlled by the
Powertrain Control Module (PCM). Because a con-
ventional timing light can not be used to adjust dis-
tributor position after installation, note position of
distributor before removal.
(1) Remove air cleaner assembly.
(2) Disconnect negative cable from battery.
(3) Remove distributor cap from distributor (two
screws).
(4) Mark the position of distributor housing in
relationship to engine or dash panel. This is done to
aid in installation.
(5) Before distributor is removed, the number one
cylinder must be brought to the Top Dead Center
(TDC) firing position.
(6) Attach a socket to the Crankshaft Vibration
Damper mounting bolt.
(7) Slowly rotate engine clockwise, as viewed from
front, until indicating mark on crankshaft vibration
damper is aligned to 0 degree (TDC) mark on timing
chain cover (Fig. 13).
(8) The distributor rotor should now be aligned to
the CYL. NO. 1 alignment mark (stamped) into the
camshaft position sensor (Fig. 14). If not, rotate the
crankshaft through another complete 360 degree
turn. Note the position of the number one cylinder
spark plug cable (on the cap) in relation to rotor.
Rotor should now be aligned to this position.
(9) Disconnect camshaft position sensor wiring
harness from main engine wiring harness.
Fig. 11 Align Timing Marks
1 - CRANKSHAFT VIBRATION DAMPER TIMING MARK
Fig. 12 Slot At 10 O’clock Position—2.5L Engine
1 - 10 0’CLOCK POSITION
2 - OIL PUMP SLOT
AN
IGNITION CONTROL
8I - 9
DISTRIBUTOR (Continued)
(10) Remove
distributor
rotor
from
distributor
shaft.
(11) Remove distributor holddown clamp bolt and
clamp (Fig. 15). Remove distributor from vehicle.
CAUTION: Do not crank engine with distributor
removed. Distributor/crankshaft relationship will be
lost.
INSTALLATION - 2.5L
(1) If engine crankshaft has been rotated after dis-
tributor
removal,
cylinder
number
1
must
be
returned to its proper firing stroke. Refer to previous
REMOVAL Step 6 and Step 7. These steps must be
done before installing distributor.
(2) Check position of slot on oil pump gear. It
should be just slightly before (counterclockwise of) 10
o’clock position (Fig. 12). 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 (Fig.
9). This pin is used to temporarily hold rotor to cyl-
inder number 1 firing position during distributor
installation. If this 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 distrib-
utor housing. Lift straight up.
(6) Four different alignment holes are provided on
the plastic ring (Fig. 16). Note that 2.5L 4–cylinder
and 4.0L 6–cylinder engines have different
alignment holes (Fig. 16).
(7) Rotate distributor shaft and install pin punch
tool through proper alignment hole in plastic ring
(Fig. 16) 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
(Fig. 10).
(10) Install rotor to distributor shaft.
Fig. 13 Damper-To-Cover Alignment Marks—Typical
1 - ALIGNMENT MARK
2 - TIMING CHAIN COVER MARKS
3 - CRANKSHAFT VIBRATION DAMPER
Fig. 14 Rotor Alignment Mark—3.9/5.2/5.9L Engines
1 - CAMSHAFT POSITION SENSOR ALIGNMENT MARK
2 - ROTOR
3 - DISTRIBUTOR
Fig. 15 Distributor Holddown Clamp—3.9/5.2/5.9L
Engines
1 - CLAMP BOLT
2 - HOLDDOWN CLAMP
3 - DISTRIBUTOR HOUSING
8I - 10
IGNITION CONTROL
AN
DISTRIBUTOR (Continued)
(11) Pre-position
distributor
into
engine
while
holding centerline of base slot in 1 o’clock position
(Fig. 17). Continue to engage distributor into engine.
The rotor and distributor will rotate clockwise during
installation. This is due to helical cut gears on dis-
tributor 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 (Fig. 18). The rotor should also be pointed
slightly past (clockwise of) 3 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 the 3 o’clock position
• plastic alignment pin (or pin punch tool) is still
installed to distributor.
• number 1 cylinder piston is set at top dead cen-
ter (TDC) (compression stroke).
• centerline of slot at base of distributor is aligned
to centerline of distributor holddown bolt hole on
engine. In this position, holddown bolt should easily
pass through slot and into engine.
No adjustments are necessary. Proceed to next
step.
Fig. 16 Pin Alignment Holes
1 - DISTRIBUTOR HOUSING (TOP VIEW)
2 - PULSE RING
3 - 4.0L 6–CYLINDER ENGINE ALIGN. HOLE
4 - 2.5L 4–CYLINDER ENGINE ALIGN. HOLE
5 - MATING ACCESS HOLE IN DISTRIBUTOR HOUSING
6 - PLASTIC RING
Fig. 17 Distributor Pre-position
1 - 1 O’CLOCK POSITION
2 - BASE SLOT
3 - DISTRIBUTOR BASE
Fig. 18 Distributor Engaged Position—2.5L
4-Cylinder Engine
1 - DISTRIBUTOR BASE SLOT
2 - CLAMP BOLT MOUNTING HOLE (ON ENGINE)
3 - DISTRIBUTOR BASE
AN
IGNITION CONTROL
8I - 11
DISTRIBUTOR (Continued)
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