Jeep 1997 Grand Cherokee Service Manual page 358

ALIGNMENT MARK CRANKSHAFT VIBRATION DAMPER
8D - 16 IGNITION SYSTEM
REMOVAL AND INSTALLATION (Continued)
DISTRIBUTOR—5.2L/5.9L ENGINES
REMOVAL
CAUTION: Base ignition timing is not adjustable
on any 5.2L/5.9L V-8 engine. Distributors do not
have built in centrifugal or vacuum assisted
advance. Base ignition timing and timing advance
are controlled by the Powertrain Control Module
(PCM). Because a conventional timing light can not
be used to adjust distributor position after installa-
tion, note position of distributor before removal.
(1) Disconnect negative cable from battery.
(2) Remove air cleaner tube at throttle body.
(3) Disconnect coil secondary cable at distributor
cap.
(4) Disconnect all secondary spark plug cables at
distributor cap. Note and mark position before
removal.
(5) Remove distributor cap from distributor (two
screws).
(6) Mark the position of distributor housing in
relationship to engine or dash panel. This is done to
aid in installation.
(7) Before distributor is removed, the number one
cylinder must be brought to the Top Dead Center
(TDC) firing position.
(8) Attach a socket to the Crankshaft Vibration
Damper mounting bolt.
(9) 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. 33).
Fig. 33 Damper-To-Cover Alignment Marks—Typical
(10) The distributor rotor should now be aligned to
the CYL. NO. 1 alignment mark (stamped) into the
camshaft position sensor (Fig. 34). If not, rotate the
crankshaft through another complete 360 degree
turn. Note the position of the number one cylinder
COVER MARKS CHAIN TIMING CAMSHAFT POSITION SENSOR DISTRIBUTOR HOUSING DISTRIBUTOR ALIGNMENT MARK
spark plug cable (on the cap) in relation to rotor.
Rotor should now be aligned to this position.
Fig. 34 Rotor Alignment Mark—5.2L/5.9LEngines
(11) Disconnect camshaft position sensor wiring
harness 3–way connector from main engine wiring
harness.
(12) Remove distributor rotor from distributor
shaft.
(13) Remove distributor holddown clamp bolt and
clamp (Fig. 35).
(14) Remove distributor from vehicle.
Fig. 35 Distributor Holddown Clamp—5.2L/
CAUTION:
removed. Distributor/crankshaft relationship will be
lost.
INSTALLATION
If engine has been cranked while distributor is
removed, establish the relationship between distribu-
tor shaft and number one piston position as follows:
5.9LEngines
Do not crank engine with distributor
CLAMP BOLT HOLDDOWN ROTOR CLAMP
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