Dodge ram truck 3500 1996 Service Manual page 408

IGNITION S \ „,..... _ _ _ _ _ _ B R
8D - 28
R E M O V A L AND BNSYALLATION ( C o n t i n u e d )
DISTRIBUTORS
REMOVAL
CAUTION: Base ignition timing is not adjustable
on any engine. Distributors do not have built in
centrifugal or vacuum assisted advance. Base igni­
tion t i m i n g and timing advance are controlled by
the Powertrain Control Module (PCM). Because a
conventional timing light can not be used t o adjust
distributor 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
t o t h e Top D e a d
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. 82).
Fig. 62 Damper-To-Cover Alignment Marks—Typical
• (8) The distributor rotor should now be aligned to
the CYL. NO. 1 alignment mark (stamped) into the
camshaft position sensor (Fig. 63). i f 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.
DISTRIBUTOR J9314-81
Fig. 83 Rotor Alignment Mark
(10) Remove distributor rotor from distributor
shaft.
(11) Remove distributor holddown clamp bolt and
clamp (Fig. 64). Remove distributor from vehicle.
Fig. 64 Distributor Holddown Clamp
CAUTION: Do not crank engine with distributor
removed. Distributor/crankshaft relationship will be
lost.
INSTALLATION
I f engine lias been cranked while distributor is
removed, establish the relationship between distribu­
tor shaft and number one piston position as follows:
Rotate crankshaft in a clockwise direction, as
viewed from front, until,number one cylinder piston
is at t o p o f compression stroke (compression should
be felt on finger with number one spark plug
removed). Then * continue to slowly rotate engine
clockwise until Indicating mark (Fig. 62) is aligned to
0 degree (TDC) mark on timing chain cover.