Oil Pressure Relief Valve Removal; Inspection; Installation; Oil Pressure Switch - Chrysler 2004 Concorde Service Manual

9 - 66 ENGINE
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. 107).
Fig. 107 Oil Pressure Relief Valve
1 - RELIEF VALVE
2 - SPRING
3 - RETAINER CAP
4 - COTTER PIN

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. 107), or engine damage
may occur.
(2) Install valve, spring and retainer cap (Fig.
107).
(3) Install new cotter pin.
(4) Install the oil pan. (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - INSTALLATION)

OIL PRESSURE SWITCH

DESCRIPTION

The engine oil pressure switch is located on the
lower left front side of the engine (Fig. 108). It
screws into the engine oil cooler adapter fitting that
is installed into the engine main oil gallery. The nor-
mally closed switch provides an input through a sin-
gle wire to the low pressure indicator light on the
instrument cluster.

OPERATION

The oil pressure switch provides a ground for the
instrument cluster low oil pressure indicator light.
The switch receives oil pressure input from the
engine main oil gallery. When engine oil pressure is
greater than 27.5 Kpa (4 psi), the switch contacts
open, providing a open circuit to the low pressure
indicator light. For wiring circuits and diagnostic
information, (Refer to Appropriate Wiring/Diagnostic
Information).
REMOVAL
(1) Raise vehicle on hoist.
(2) Position an oil collecting container under
switch location.
(3) Disconnect electrical connector (Fig. 108).
(4) Hold oil cooler fitting with a wrench.
(5) Unscrew oil pressure switch from fitting (Fig.
108).
INSTALLATION
(1) Apply Mopar Thread Sealant to the switch
threads.
(2) Install oil pressure switch to fitting (Fig. 108).
(3) Hold oil cooler fitting with a wrench and
tighten oil pressure switch.
(4) Connect electrical connector (Fig. 108).
(5) Lower vehicle.
(6) Start engine and check for leaks.
(7) Check engine oil level and adjust as neccessary.
LH