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Unread 03-13-2010, 06:22 PM   #1
jwilly2
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2000 XJ Cherokee 
 
Join Date: Feb 2009
Location: Tennessee
Posts: 153
Help!! Ignition timing

Hey Guys....
I'm trying to finish up a 99 GC 4.0 engine rebuild and need help with the distributor...... I know it's not actually a dis, but for lack of the correct term, that's how I will refer to it. Anyway, the engine is still on the stand and is sitting at TDC. I marked the flange where it sits down to the block when it was removed, so I know the wiring connector faces basically straight toward the rear of the engine.... I just don't know how to time the thing with the camshaft. HELP Please!!!

Thanks in advance, James

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Unread 03-14-2010, 08:16 PM   #2
jwilly2
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Join Date: Feb 2009
Location: Tennessee
Posts: 153
Anybody???
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Unread 03-14-2010, 08:36 PM   #3
indept
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Location: New Jersey
Posts: 1,306
From my 2000 WJ FSM (which is identical to your '99), sorry, the illustrations didn't copy

CAMSHAFT POSITION SENSOR—4.0L ENGINE
The Camshaft Position Sensor (CMP) on the 4.0L
6–cylinder engine is bolted to the top of the oil pump
drive shaft assembly (Fig. 31). The sensor and drive
shaft assembly is located on the right side of the
engine near the oil filter (Fig. 32).
The rotational position of oil pump drive determines
fuel synchronization only. It does not determine
ignition timing.
NOTE: Do not attempt to rotate the oil pump drive
to modify ignition timing.
Two different procedures are needed for
removal and installation. The first procedure will
detail removal and installation of the sensor only.
The second procedure will detail removal and installation
of the sensor and oil pump drive shaft assembly.
The second procedure is to be used if the engine
has been disassembled.
An internal oil seal is used in the drive shaft housing
that prevents engine oil at the bottom of the sensor.
The seal is not serviceable.

REMOVAL AND INSTALLATION (Continued)
REMOVAL—SENSOR ONLY
(1) Disconnect electrical connector at CMP sensor
(Fig. 32).
(2) Remove 2 sensor mounting bolts (Fig. 31) or
(Fig. 32).
(3) Remove sensor from oil pump drive.
INSTALLATION—SENSOR ONLY
(1) Install sensor to oil pump drive.
(2) Install 2 sensor mounting bolts and tighten to
2 N·m (15 in. lbs.) torque.
(3) Connect electrical connector to CMP sensor.
REMOVAL—OIL PUMP DRIVE AND SENSOR
If the CMP and oil pump drive are to be
removed and installed, do not allow engine
crankshaft or camshaft to rotate. CMP sensor
relationship will be lost.
(1) Disconnect electrical connector at CMP sensor
(Fig. 32).
(2) Remove 2 sensor mounting bolts (Fig. 31) or
(Fig. 32).
(3) Remove sensor from oil pump drive.

REMOVAL AND INSTALLATION (Continued)
(4) Before proceeding to next step, mark and note
rotational position of oil pump drive in relationship
to engine block. After installation, the CMP sensor
should face rear of engine 0°.
(5) Remove hold-down bolt and clamp (Fig. 32).
(6) While pulling assembly from engine, note direction
and position of pulse ring (Fig. 31). After
removal, look down into top of oil pump and note
direction and position of slot at top of oil pump gear.
(7) Remove and discard old oil pump drive-to-engine
block gasket.
INSTALLATION—OIL PUMP DRIVE AND SENSOR
(1) Clean oil pump drive mounting hole area of
engine block.
(2) Install new oil pump drive-to-engine block gasket.
(3) Temporarily install a toothpick or similar tool
through access hole at side of oil pump drive housing.
Align toothpick into mating hole on pulse ring (Fig.
33).
(4) Install oil pump drive into engine while aligning
into slot on oil pump. Rotate oil pump drive back
to its original position and install hold-down clamp
and bolt. Finger tighten bolt. Do not do a final tightening
of bolt at this time.
(5) If engine crankshaft or camshaft has been
rotated, such as during engine tear-down, CMP sensor
relationship must be reestablished.
(a) Remove ignition coil rail assembly. Refer to
Ignition Coil Removal/Installation.
(b) Remove cylinder number 1 spark plug.
(c) Hold a finger over the open spark plug hole.
Rotate engine at vibration dampener bolt until
compression (pressure) is felt.
(d) 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 (Fig. 34). Always
rotate engine in direction of normal rotation. Do
not rotate engine backward to align timing marks.
(e) Install oil pump drive into engine while
aligning into slot on oil pump. If pump drive will
not drop down flush to engine block, the oil pump
slot is not aligned. Remove oil pump drive and
align slot in oil pump to shaft at bottom of drive.
Install into engine. Rotate oil pump drive back to
its original position and install hold-down clamp
and bolt. Finger tighten bolt. Do not do a final
tightening of bolt at this time.
(f) Remove toothpick from housing.
(6) Install sensor to oil pump drive. After installation,
the CMP sensor should face rear of engine 0°.
(7) Install 2 sensor mounting bolts and tighten to
2 N·m (15 in. lbs.) torque.
(8) Connect electrical connector to CMP sensor.
(9) If removed, install spark plug and ignition coil
rail.
To verify correct rotational position of oil pump
drive, the DRB scan tool must be used.
WARNING: WHEN PERFORMING THE FOLLOWING
TEST, THE ENGINE WILL BE RUNNING. BE CAREFUL
NOT TO STAND IN LINE WITH THE FAN
BLADES OR FAN BELT. DO NOT WEAR LOOSE
CLOTHING.
(10) Connect DRB scan tool to data link connector.
The data link connector is located in passenger compartment,
below and to left of steering column.
(11) Gain access to SET SYNC screen on DRB.
(12) Follow directions on DRB screen and start
engine. Bring to operating temperature (engine must
be in “closed loop” mode).
(13) With engine running at idle speed, the words
IN RANGE should appear on screen along with 0°.
This indicates correct position of oil pump drive.
(14) If a plus (+) or a minus (-) is displayed next to
degree number, and/or the degree displayed is not
zero, loosen but do not remove hold-down clamp bolt.
Rotate oil pump drive until IN RANGE appears on
screen. Continue to rotate oil pump drive until
achieving as close to 0° as possible.
The degree scale on SET SYNC screen of DRB is
referring to fuel synchronization only. It is not
referring to ignition timing. Because of this, do
not attempt to adjust ignition timing using this
method. Rotating oil pump drive will have no effect

REMOVAL AND INSTALLATION (Continued)
on ignition timing. All ignition timing values are controlled
by powertrain control module (PCM).
(15) Tighten hold-down clamp bolt to 23 N·m (17
ft. lbs.) torque.
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Unread 03-14-2010, 09:38 PM   #4
jwilly2
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Join Date: Feb 2009
Location: Tennessee
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Indept... thanks so much for that detailed info... I believe we can now get it back in time. Now if I can figure out the correct placement of my oil pan bolts, we will be in business again. Thanks again for all the trouble you went to in posting that info.
James
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Unread 03-22-2010, 08:16 PM   #5
indept
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Location: New Jersey
Posts: 1,306
Sorry to take so long, I've been busy. If you're talking about where the four 5/16 bolts go, the second bolt back from the front of the engine on both sides and the last towards the rear on each side are the 5/16.

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