(12) Disconnect the five high–pressure fuel lines
from the fuel injection pump. Also disconnect fuel
lines at the fuel injectors. For procedures, refer to
High–Pressure Fuel Lines in this group. Place a rag
beneath the fittings to catch excess fuel.
(13) Remove the plug from timing gear cover.
(14) The “Top Dead Center” (T. D. C.) compression
firing position for the #1 cylinder can be determined
as follows:
(a) Using a socket attached to the front of the
crankshaft, rotate the engine clockwise until spe-
cial alignment tool VM# 8374 can be inserted
through the T. D. C. tool access hole in the right
side of the transmission adapter plate (Fig. 26),
stopping the flexplate rotation. This position is T.
D. C. or 360° (crankshaft deg.) away from T. D. C.
Engine must be positioned at T. D. C. on #1
cylinder compression firing stroke.
(b) To verify that you are at T. D. C. Remove the
oil fill cap from the cylinder head cover and the
alignment tool from the transmission adapter plate.
(c) Rotate
the
crankshaft
one-quarter
turn
counter-clockwise and clockwise while observing
the cylinder #2 intake rocker arm through the oil
fill cap hole. (The intake valve rocker arm should
stop moving). If the rocker arm does not move you
have identified T. D. C.
(d) If T. D. C. was found continue the procedure,
if not rotate the crankshaft one revolution (360°)
until the alignment tool can be re-installed in the
flexplate (Fig. 26). T. D. C. is now identified for the
#1 cylinder compression firing stroke. Mark the
damper and timing cover for quick reference to T.
Fig. 24 Fuel Injection Pump
1 – FUEL INJECTION PUMP ASSEMBLY
2 – FUEL RETURN LINE
3 – FUEL SUPPLY LINE
4 – FUEL INJECTION PUMP 10–WAY CONNECTOR
5 – FUEL TIMING SOLENOID
Fig. 25 Engine Coolant Temperature Sensors
1 – PCM ENGINE COOLANT TEMPERATURE (ECT) SENSOR
2 – ECM ENGINE COOLANT TEMPERATURE (ECT) SENSOR
3 – ECM ECT SENSOR HARNESS CONNECTOR
4 – PCM ECT SENSOR HARNESS CONNECTOR
Fig. 26 Top Dead Center Alignment Tool Access
Hole
1 – TORQUE CONVERTER BOLT ACCESS HOLE
2 – ENGINE OIL PAN
3 – TOP DEAD CENTER ALIGNMENT TOOL ACCESS HOLE
14 - 16
FUEL SYSTEM—3.1L DIESEL ENGINE
WJ
REMOVAL AND INSTALLATION (Continued)
2000 JEEP GRAND CHEROKEE