Chrysler Pacifica. Manual — part 681

LUBRICATION

DESCRIPTION

The oil lubrication system (Fig. 123) is a full-flow

filtration, pressure feed type. The oil pump body is
mounted to the engine block. The pump inner rotor is
driven by the crankshaft. A windage tray, increases
power by minimizing oil windage at high engine
RPM. For increased oil cooling, an oil-to-coolant oil
cooler is used.

Fig. 123 Oil Lubrication System

1 - CRANKSHAFT

9 - PEDESTAL DRILLED PASSAGE

2 - OUTER ROTOR

10 - EXHAUST ROCKER SHAFT

3 - INNER ROTOR

11 - SHAFT/PEDESTAL DOWEL PASSAGE

4 - RELIEF VALVE

12 - CAMSHAFT BEARING BORE

5 - OIL PAN

13 - CYLINDER BLOCK OIL GALLERY

6 - OIL SCREEN

14 - CYLINDER HEAD GASKET

7 - OIL PUMP CASE

15 - HEAD BOLT HOLE

8 - OIL FLOWS TO ONLY ONE PEDESTAL ON EACH HEAD -
SECOND FROM REAR ON RIGHT HEAD - SECOND FROM FRONT
ON LEFT HEAD

16 - INTAKE ROCKER SHAFT

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ENGINE 3.5L

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OPERATION

Engine oil stored in the oil pan is drawn in and

discharged by a gerotor type oil pump. The oil pump
is directly coupled to the crankshaft. Oil pressure is
regulated by a relief valve. The oil is fed through an
oil filter and to the crankshaft journals from the oil
gallery in the cylinder block. This gallery also feeds
oil under pressure to the cylinder heads. Oil flows
through each cylinder heads oil passage to the rocker
shafts. Oil then feeds the camshaft journals, rocker
arms, and hydraulic lash adjusters (Fig. 124).

Fig. 124 Oil Lubrication System

1 - CRANKSHAFT

9 - PEDESTAL DRILLED PASSAGE

2 - OUTER ROTOR

10 - EXHAUST ROCKER SHAFT

3 - INNER ROTOR

11 - SHAFT/PEDESTAL DOWEL PASSAGE

4 - RELIEF VALVE

12 - CAMSHAFT BEARING BORE

5 - OIL PAN

13 - CYLINDER BLOCK OIL GALLERY

6 - OIL SCREEN

14 - CYLINDER HEAD GASKET

7 - OIL PUMP CASE

15 - HEAD BOLT HOLE

8 - OIL FLOWS TO ONLY ONE PEDESTAL ON EACH HEAD -
SECOND FROM REAR ON RIGHT HEAD - SECOND FROM FRONT
ON LEFT HEAD

16 - INTAKE ROCKER SHAFT

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ENGINE 3.5L

CS

LUBRICATION (Continued)

DIAGNOSIS AND TESTING - CHECKING
ENGINE OIL PRESSURE

Check oil pressure using a gauge at oil pressure

switch (Fig. 125) location.

(1) Remove the oil pressure switch (Refer to 9 -

ENGINE/LUBRICATION/OIL PRESSURE SENSOR/
SWITCH - REMOVAL).

(2) Install oil pressure test gauge, Special Tool

C-3292 with Adapter 8406. For Special Tool identifi-
cation, (Refer to 9 - ENGINE - SPECIAL TOOLS).

CAUTION: If oil pressure is 0 at idle, Do Not Run
engine at 3000 RPM.

(3) Warm engine to normal operating temperature.
(4) Monitor gauge readings at idle and 3000 rpm.

For specifications (Refer to 9 - ENGINE - SPECIFI-
CATIONS).

OIL

DESCRIPTION

For engine oil type and capacity (Refer to LUBRI-

CATION

&

MAINTENANCE/FLUID

TYPES

-

DESCRIPTION - ENGINE OIL)

STANDARD PROCEDURE

STANDARD PROCEDURE - ENGINE OIL LEVEL
CHECK

The best time to check engine oil level is after it

has sat overnight, or if the engine has been running,
allow the engine to be shut off for at least 5 minutes
before checking oil level.

Checking the oil while the vehicle is on level

ground will improve the accuracy of the oil level
reading. Add only when the level is at or below the
ADD mark.

STANDARD PROCEDURE - ENGINE OIL AND
FILTER CHANGE

Change engine oil at mileage and time intervals

described in the Maintenance Schedule. (Refer to
LUBRICATION

&

MAINTENANCE/MAINTE-

NANCE SCHEDULES - DESCRIPTION)

WARNING: NEW OR USED ENGINE OIL CAN BE
IRRITATING TO THE SKIN. AVOID PROLONGED OR
REPEATED SKIN CONTACT WITH ENGINE OIL.
CONTAMINANTS IN USED ENGINE OIL, CAUSED BY
INTERNAL COMBUSTION, CAN BE HAZARDOUS TO
YOUR HEALTH. THOROUGHLY WASH EXPOSED
SKIN WITH SOAP AND WATER. DO NOT WASH
SKIN WITH GASOLINE, DIESEL FUEL, THINNER, OR
SOLVENTS, HEALTH PROBLEMS CAN RESULT. DO
NOT POLLUTE, DISPOSE OF USED ENGINE OIL
PROPERLY. CONTACT YOUR DEALER OR GOVERN-
MENT AGENCY FOR LOCATION OF COLLECTION
CENTER IN YOUR AREA.

Fig. 125 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

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ENGINE 3.5L

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LUBRICATION (Continued)

TO CHANGE ENGINE OIL

(1) Run engine until achieving normal operating

temperature.

(2) Position the vehicle on a level surface and turn

engine off.

(3) Open hood, remove engine oil fill cap (Fig. 126).

(4) Raise vehicle on hoist.
(5) Place a suitable drain pan under crankcase

drain.

(6) Remove oil pan drain plug from crankcase and

allow oil to drain into pan. Inspect drain plug
threads for stretching or other damage. Replace
drain plug and gasket if damaged.

(7) Remove oil filter (Fig. 127).
(8) Install drain plug in crankcase. Torque oil pan

drain plug to 27 N·m (20 ft. lbs.).

(9) Install new oil filter (Fig. 127).
(10) Lower vehicle.
(11) Fill crankcase with specified type and amount

of engine oil (Fig. 126). (Refer to LUBRICATION &

MAINTENANCE/FLUID TYPES - DESCRIPTION -
ENGINE OIL) (Refer to LUBRICATION & MAINTE-
NANCE - SPECIFICATIONS)

(12) Install oil fill cap (Fig. 126).
(13) Start engine and inspect for leaks.
(14) Stop engine and inspect oil level.

OIL FILTER SPECIFICATION

All engines are equipped with a high quality full-

flow, disposable type oil filter. When replacing oil fil-
ter, use a Mopar

t filter or equivalent.

USED ENGINE OIL DISPOSAL

Care should be exercised when disposing used

engine oil after it has been drained from a vehicle
engine. Refer to the WARNING above.

Fig. 126 ENGINE OIL FILL AND LEVEL CHECK

1 - ENGINE OIL FILL CAP
2 - TRANSMISSION FLUID LEVEL INDICATOR
3 - ENGINE OIL LEVEL INDICATOR

Fig. 127 ENGINE OIL FILTER AND COOLER

1 - EXHAUST MANIFOLD
2 - ENGINE OIL COOLER
3 - ENGINE OIL FILTER
4 - AIR CONDITIONING COMPRESSOR
5 - OIL PRESSURE SENDING UNIT

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ENGINE 3.5L

CS

OIL (Continued)