Chrysler Pacifica. Manual — part 683
(11) Lower vehicle.
(12) Install the upper A/C compressor mounting
bolts. Tighten bolts to 28 N.m (250 in. lbs.).
(13) Install the oil indicator.
(14) Install radiator fans, core support and close
out panel.
(15) Fill engine crankcase with proper oil to cor-
rect level.
(16) Connect negative battery cable.
OIL PRESSURE RELIEF VALVE
REMOVAL
(1) Remove the oil pan. (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - REMOVAL)
(2) To remove the relief valve, proceed as follows:
(a) Remove the cotter pin that retains the
retainer cap.
(b) Drill a 3.175 mm (1/8 inch.) hole into the
relief valve retainer cap
(c) Insert a self-threading sheet metal screw into
cap.
(d) Using a suitable slide hammer tool, remove
retainer cap. Discard retainer cap
(e) Remove spring and relief valve (Fig. 138).
INSPECTION
(1) Inspect oil pressure relief valve plunger for
scoring and free operation in its bore. Small marks
may be removed with 400-grit wet or dry sandpaper.
(2) The relief valve spring has a free length of
approximately 49.5 mm (1.95 in.) it should test
between 101-110 N (23-25 lbs.) when compressed to
34 mm (1.34 in.). Replace spring that fails to meet
specifications.
INSTALLATION
(1) Lubricate relief valve with oil.
CAUTION:
The
pressure
relief
valve
must
be
installed as shown in (Fig. 139), or engine damage
may occur.
(2) Install valve, spring and retainer cap.
(3) Install new cotter pin.
(4) Install the oil pan. (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - INSTALLATION)
Fig. 138 Oil Pressure Relief Valve
1 - RELIEF VALVE
2 - SPRING
3 - RETAINER CAP
4 - COTTER PIN
Fig. 139 Oil Pressure Relief Valve
1 - RELIEF VALVE
2 - SPRING
3 - RETAINER CAP
4 - COTTER PIN
CS
ENGINE 3.5L
9 - 87
OIL PAN (Continued)
SWITCH-OIL PRESSURE
SENSOR
REMOVAL
(1) Raise vehicle on hoist.
(2) Position
an
oil
collecting
container
under
switch location.
(3) Disconnect electrical connector.
(4) Unscrew oil pressure switch from oil filter
adapter (Fig. 140).
INSTALLATION
(1) Apply Mopar
t Thread Sealant to the switch
threads.
(2) Install oil pressure switch to fitting (Fig. 141).
(3) Connect electrical connector.
(4) Lower vehicle.
(5) Start engine and check for leaks.
(6) Check engine oil level and adjust as neccessary.
OIL PUMP
REMOVAL
It is necessary to remove the oil pump body to ser-
vice the oil pump rotors.
The oil pump pressure relief valve can be serviced
by removing the oil pan. (Refer to 9 - ENGINE/LU-
BRICATION/OIL
PRESSURE
RELIEF
VALVE
-
REMOVAL)
(1) Drain the cooling system. (Refer to 7 - COOL-
ING - STANDARD PROCEDURE)
(2) Remove the timing belt. (Refer to 9 - ENGINE/
VALVE
TIMING/TIMING
BELT/CHAIN
AND
SPROCKETS - REMOVAL)
(3) Remove the crankshaft sprocket. (Refer to 9 -
ENGINE/VALVE
TIMING/TIMING
BELT/CHAIN
AND SPROCKETS - REMOVAL)
Fig. 140 Engine Oil Cooler and Filter Ad
1 - OIL FILTER ADAPTER
2 - OIL COOLER
3 - FASTENER - OIL FILTER ADAPTER
4 - OIL FILTER
5 - WATER INLET TUBE
6 - GASKET
7 - OIL PRESSURE SENSOR
Fig. 141 Engine Oil Cooler and Filter Ad
1 - OIL FILTER ADAPTER
2 - OIL COOLER
3 - FASTENER - OIL FILTER ADAPTER
4 - OIL FILTER
5 - WATER INLET TUBE
6 - GASKET
7 - OIL PRESSURE SENSOR
9 - 88
ENGINE 3.5L
CS
(4) Remove the oil pan. (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - REMOVAL)
(5) Remove the oil pickup tube.
(6) Remove the oil pump fasteners. Remove pump
and gasket from engine (Fig. 142).
DISASSEMBLY
(1) To remove the relief valve, proceed as follows:
(2) Remove cotter pin. Drill a 3.175 mm (1/8 inch.)
hole into the relief valve retainer cap and insert a
self-threading sheet metal screw into cap.
(3) Clamp screw into a vise and while supporting
oil pump body, remove cap by tapping oil pump body
using a soft hammer. Discard retainer cap and
remove spring and relief valve (Fig. 143).
(4) Remove oil pump cover screws, and lift off
cover.
(5) Remove pump rotors.
(6) Wash all parts in a suitable solvent and inspect
carefully for damage or wear (Fig. 144).
CLEANING
(1) Clean all parts thoroughly in a suitable sol-
vent.
INSPECTION
(1) Disassemble oil pump. (Refer to 9 - ENGINE/
LUBRICATION/OIL PUMP - DISASSEMBLY)
(2) Clean all parts thoroughly. Mating surface of
the oil pump housing should be smooth. Replace
pump cover if scratched or grooved.
(3) Lay a straightedge across the pump cover sur-
face (Fig. 145). If a 0.025 mm (0.001 in.) feeler gauge
can be inserted between cover and straight edge,
cover should be replaced.
Fig. 142 OIL PUMP
1 - OIL PUMP
2 - GASKET
Fig. 143 Oil Pressure Relief Valve
1 - RELIEF VALVE
2 - SPRING
3 - RETAINER CAP
4 - COTTER PIN
Fig. 144 Oil Pump
1 - OIL PUMP BODY
2 - OIL PUMP OUTER ROTOR
3 - SCREWS
4 - OIL PUMP COVER
5 - OIL PUMP INNER ROTOR
Fig. 145 Checking Oil Pump Cover Flatness
1 - STRAIGHT EDGE
2 - FEELER GAUGE
3 - OIL PUMP COVER
CS
ENGINE 3.5L
9 - 89
OIL PUMP (Continued)
(4) Measure thickness and diameter of outer rotor.
If outer rotor thickness measures 14.299 mm (0.563
in.) or less (Fig. 146), or if the diameter is 79.78 mm
(3.141 inches.) or less, replace outer rotor.
(5) If inner rotor measures 14.299 mm (0.563 in.)
or less replace inner rotor (Fig. 147).
(6) Slide outer rotor into body, press to one side
with fingers and measure clearance between rotor
and body (Fig. 148). If measurement is 0.39 mm
(0.015 inch.) or more, replace body only if outer rotor
is in specifications.
(7) Install inner rotor into body. If clearance
between inner and outer rotors (Fig. 149) is 0.20 mm
(0.008 inch.) or more, replace both rotors.
Fig. 146 Measuring Outer
Fig. 147 Measuring Inner Rotor Thickness
Fig. 148 Measuring Outer Rotor Clearance in
Housing
1 - FEELER GAUGE
2 - OUTER ROTOR
Fig. 149 Measuring Clearance Between Rotors
1 - FEELER GAUGE
2 - OUTER ROTOR
3 - INNER ROTOR
9 - 90
ENGINE 3.5L
CS
OIL PUMP (Continued)
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