Chrysler 300M, Dodge Interpid. Manual — part 253

REAR MOUNT

REMOVAL

(1) Raise vehicle on hoist.
(2) Support transaxle with a jack.
(3) Remove isolator nuts from the mount to trans-

axle mount bracket (Fig. 99).

(4) Remove rear mount isolator bolts to crossmem-

ber and remove mount (Fig. 99).

INSTALLATION

(1) Position isolator onto crossmember.
(2) Install bolts attaching isolator to crossmember

and tighten to 33 N·m (250 in. lbs.) (Fig. 99).

(3) Lower transaxle onto isolator.
(4) Install isolator nuts and tighten to 61 N·m (45

ft. lbs.) (Fig. 99).

(5) Lower vehicle.

RIGHT MOUNT

REMOVAL

(1) Raise vehicle on hoist.
(2) Remove the isolator attaching nuts from top of

the mounting bracket (Fig. 99).

(3) Support the engine with a jack and a block of

wood across the full width of the oil pan.

(4) Remove the lower attaching nuts from the bot-

tom of the isolator to the frame (Fig. 99).

(5) Raise engine carefully with jack enough to

remove the isolator with heat shield from its mount.

INSTALLATION

(1) Install isolator mount with heat shield onto the

frame.

(2) Lower the engine onto the isolator mount.
(3) Remove jack from vehicle.
(4) Tighten the isolator to frame nuts to 61 N·m

(45 ft. lbs.) (Fig. 99).

(5) Install the upper attaching nuts to mount and

tighten to 61 N·m (45 ft. lbs.) (Fig. 99).

(6) Lower vehicle.

Fig. 99 ENGINE MOUNTING

1 - NUT

6 - HEAT SHIELD

2 - REAR ISOLATOR

7 - BOLT

3 - BOLT

8 - ENGINE MOUNT BRACKET

4 - NUT

9 - NUT

5 - ISOLATOR

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ENGINE

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LUBRICATION

DESCRIPTION

System 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 cool-
ing, an oil-to-coolant oil cooler is used. This cooler is
mounted inside the radiator tank.

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. 100).

DIAGNOSIS AND TESTING

DIAGNOSIS AND TESTING - ENGINE OIL LEAK
INSPECTION

Begin with a thorough visual inspection of the

engine, particularly at the area of the suspected leak.
If an oil leak source is not readily identifiable, the
following steps should be followed:

(1) Do not clean or degrease the engine at this

time because some solvents may cause rubber to
swell, temporarily stopping the leak.

(2) Add an oil soluble dye (use as recommended by

manufacturer). Start the engine and let idle for
approximately 15 minutes. Check the oil dipstick to
make sure the dye is thoroughly mixed as indicated
with a bright yellow color under a black light.

(3) Using a black light, inspect the entire engine

for fluorescent dye, particularly at the suspected area
of oil leak. If the oil leak is found and identified,
repair as necessary.

Fig. 100 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

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(4) If dye is not observed, drive the vehicle at var-

ious speeds for approximately 24 km (15 miles), and
repeat inspection.

(5) If the oil leak source is not positively

identified at this time, proceed with the air leak
detection test method as follows:

• Disconnect the fresh air hose (make-up air) at

the cylinder head cover and plug or cap the nipple on
the cover.

• Remove the PCV valve hose from the cylinder

head cover. Cap or plug the PCV valve nipple on the
cover.

• Attach an air hose with pressure gauge and reg-

ulator to the dipstick tube.

CAUTION: Do not subject the engine assembly to
more than 20.6 kpa (3 PSI) of test pressure.

• Gradually apply air pressure from 1 psi to 2.5

psi maximum while applying soapy water at the sus-
pected source. Adjust the regulator to the suitable
test pressure that provides the best bubbles which
will pinpoint the leak source. If the oil leak is
detected and identified, repair per service manual
procedures.

• If the leakage occurs at the crankshaft rear oil

seal area, refer to the section, Inspection for Rear
Seal Area Leak.

(6) If no leaks are detected, turn off the air supply.

Remove the air hose, all plugs, and caps. Install the
PCV valve and fresh air hose (make-up air). Proceed
to next step.

(7) Clean the oil off the suspect oil leak area using

a suitable solvent. Drive the vehicle at various
speeds approximately 24 km (15 miles). Inspect the
engine for signs of an oil leak by using a black light.

NOTE: If oil leakage is observed at the dipstick tube
to block location; remove the tube, clean and reseal
using Mopar

T

Stud & Bearing Mount (press fit tube

applications only), and for O-ring style tubes,
remove tube and replace the O-ring seal.

INSPECTION FOR REAR SEAL AREA LEAKS

Since it is sometimes difficult to determine the

source of an oil leak in the rear seal area of the
engine, a more involved inspection is necessary. The
following steps should be followed to help pinpoint
the source of the leak.

If the leakage occurs at the crankshaft rear oil seal

area:

(1) Disconnect the battery.
(2) Raise the vehicle.
(3) Remove torque converter or clutch housing

cover and inspect rear of block for evidence of oil.
Use a black light to check for the oil leak. If a leak is

present in this area, remove transmission for further
inspection.

(a) Circular spray pattern generally indicates

seal leakage or crankshaft damage.

(b) Where leakage tends to run straight down,

possible causes are a porous block, oil gallery cup
plug, bedplate to cylinder block mating surfaces
and seal bore. See proper repair procedures for
these items.
(4) If no leaks are detected, pressurize the crank-

case as previously described.

CAUTION: Do not exceed 20.6 kPa (3 psi).

(5) If the leak is not detected, very slowly turn the

crankshaft and watch for leakage. If a leak is
detected between the crankshaft and seal while
slowly turning the crankshaft, it is possible the
crankshaft seal surface is damaged. The seal area on
the crankshaft could have minor nicks or scratches
that can be polished out with emery cloth.

CAUTION: Use extreme caution when crankshaft
polishing is necessary to remove minor nicks and
scratches. The crankshaft seal flange is especially
machined to complement the function of the rear oil
seal.

(6) For bubbles that remain steady with shaft

rotation, no further inspection can be done until dis-
assembled.

(7) After the oil leak root cause and appropriate

corrective action have been identified, replace compo-
nent(s) as necessary.

DIAGNOSIS AND TESTING - CHECKING
ENGINE OIL PRESSURE

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

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

(2) Install oil pressure test gauge assembly, Spe-

cial Tools C-3292 with 8406 adaptor.

(3) Start engine and monitor gauge readings.

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

(4) Oil Pressure (engine at operating temperature):

Curb Idle 34.5 kPa (5 psi) minimum 3000 RPM
300–724 kPa (45–105 psi).

(5) If oil pressure is 0 at idle. Shut off engine,

check for pressure relief valve stuck open or a
clogged oil pickup screen.

(6) Install oil pressure switch after testing is com-

pleted. (Refer to 9 - ENGINE/LUBRICATION/OIL
PRESSURE SENSOR/SWITCH - INSTALLATION)

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ENGINE

9 - 61

LUBRICATION (Continued)

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 (Fig. 101). 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.

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) Hoist and support vehicle on safety stands.

(Refer to LUBRICATION & MAINTENANCE/HOIST-
ING - STANDARD PROCEDURE)

(4) Remove oil fill cap.
(5) Place a suitable drain pan under crankcase

drain.

(6) Remove 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. (Refer to 9 - ENGINE/LUBRI-

CATION/OIL FILTER - REMOVAL)

(8) Install drain plug in crankcase.
(9) Install new oil filter. (Refer to 9 - ENGINE/LU-

BRICATION/OIL FILTER - INSTALLATION)

(10) Lower vehicle and fill crankcase with specified

type and amount of engine oil. (Refer to LUBRICA-
TION

&

MAINTENANCE/FLUID

TYPES

-

DESCRIPTION - ENGINE OIL) (Refer to LUBRICA-
TION & MAINTENANCE - SPECIFICATIONS)

(11) Install oil fill cap.
(12) Start engine and inspect for leaks.
(13) 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.

OIL COOLER & LINES

DESCRIPTION

Depending on vehicle options, some models use an

engine oil cooler that is mounted inside the right
radiator tank. An oil cooler pressure control valve is
used to control flow to the cooler (Fig. 102).

OPERATION

Engine oil travels from the control valve through

the supply line and into the cooler. The control valve
allows engine oil flow when pressure is above

Fig. 101 ENGINE OIL FILL AND DIPSTICK

LOCATIONS

1 - ENGINE OIL FILL
2 - ENGINE OIL DIPSTICK

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ENGINE

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