ghttbnz

99 Jeep grand cherokee (WJ) 4.0l camshaft position sensor the one that drives the oil pump

replaced with rebuilt motor, and now i am installing the old cmp, canty find instructions on how to install from scratch,. when you dont have anything marked, what is the procedure?

dave1123

Page 6-19 of the Haynes repair manual, it spells it out step by step.

ghttbnz

"When installing the CamshaftPS, the engine needs to be at TDC. To time it properly, set the engine at TDC using the mark on the harmonic balancer and timing cover. With the CPS removed, you will see a hole in the casing of the CPS and a hole on the inside ring. Line the two up and tape in a drill bit or nail to hold it perfectly in place. Slip the CPS back into the hole and clamp it back down before removing the drill bit."

found these instructions elsewhere, seem to be right on, ofcourse a scanning tool (DRBIII) wills till be needed afterwards.

ol"blue

You need to make sure it's at TDC on the compression stroke for #1, not just at TDC.
This comes from the WJ FSM:

(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. 9). 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
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.