Jeep Cherokee 2000 Service Manual - page 1128
(2) Remove the timing gear cover. Refer to timing
gear cover removal in this section.
(3) Align all the timing marks before removing the
vacuum pump (Fig. 47).
(4) Remove the vacuum pump retaining bolts..
(5) Remove the internal vacuum pump.
INSTALLATION
(1) To install the vacuum pump, align with timing
marks on gear set and install (Fig. 47). Torque bolts
to 27.5 N·m (20 ft. lbs.).
(2) Install the timing gear cover. Refer to timing
gear cover removal in this section.
(3) Connect the negative battery cable.
OIL PUMP PRESSURE RELIEF VALVE
REMOVAL
(1) Disconnect the negative battery cable
(2) Remove the oil pan. Refer to oil pan removal
and installation procedure in this section.
(3) Remove the relief valve snap ring.
(4) Remove the relief valve cap, spring, and
plunger (Fig. 51).
(5) Check the relief valve spring length. Relief
valve spring free length is 57.5mm (2.263 in.). If
spring length is less or spring is distorted it must be
replaced.
Fig. 47 Timing Marks
1 – VACUUM PUMP
2 – CAMSHAFT
3 – INJECTION PUMP
4 – TIMING MARKS
5 – OIL PUMP
6 – CRANKSHAFT
Fig. 48 Vacuum Pump
1 – VACUUM PUMP
2 – CAMSHAFT
3 – OIL PUMP
4 – CRANKSHAFT
Fig. 49 Vacuum Pump Parts
1 – O-RING
2 – ROTOR BLADES
3 – VACUUM PUMP
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ENGINE
XJ
REMOVAL AND INSTALLATION (Continued)