Dodge Durango (DN). Manual — part 421

CHECKING ENGINE OIL PRESSURE

(1) Remove oil pressure sending unit (Fig. 3) and

install gauge assembly C-3292.

(2) Run engine until thermostat opens.
(3) Oil Pressure:
• Curb Idle—25 Kpa (4 psi) minimum

• 3000 rpm—170 - 550 KPa (25 - 80 psi)
(4) If oil pressure is 0 at idle, shut off engine.

Check for a clogged oil pick-up screen or a pressure
relief valve stuck open.

SERVICE PROCEDURES

FORM-IN-PLACE GASKETS

There are several places where form-in-place gas-

kets are used on the engine. DO NOT use form-in-
place gasket material unless specified. Care
must be taken when applying form-in-place gaskets.
Bead size, continuity and location are of great impor-
tance. Too thin a bead can result in leakage while too
much can result in spill-over. A continuous bead of
the proper width is essential to obtain a leak-free
joint.

Two types of form-in-place gasket materials are

used in the engine area (Mopar Silicone Rubber
Adhesive Sealant and Mopar Gasket Maker). Each

have different properties and cannot be used inter-
changeably.

MOPAR SILICONE RUBBER ADHESIVE SEALANT

Mopar Silicone Rubber Adhesive Sealant, normally

black in color, is available in 3 ounce tubes. Moisture
in the air causes the sealant material to cure. This
material is normally used on flexible metal flanges.
It has a shelf life of a year and will not properly cure
if over aged. Always inspect the package for the expi-
ration date before use.

MOPAR GASKET MAKER

Mopar Gasket Maker, normally red in color, is

available in 6 cc tubes. This anaerobic type gasket
material cures in the absence of air when squeezed
between smooth machined metallic surfaces. It will
not cure if left in the uncovered tube. DO NOT use
on flexible metal flanges.

SURFACE PREPARATION

Parts assembled with form-in-place gaskets may be

disassembled

without

unusual

effort.

In

some

instances, it may be necessary to lightly tap the part
with a mallet or other suitable tool to break the seal
between the mating surfaces. A flat gasket scraper
may also be lightly tapped into the joint but care
must be taken not to damage the mating surfaces.

Scrape or wire brush all gasket surfaces to remove

all loose material. Inspect stamped parts to ensure
gasket rails are flat. Flatten rails with a hammer on
a flat plate, if required. Gasket surfaces must be free
of oil and dirt. Make sure the old gasket material is
removed from blind attaching holes.

GASKET APPLICATION

Assembling parts using a form-in-place gasket

requires care.

Mopar Silicone Rubber Adhesive Sealant should be

applied in a continuous bead approximately 3 mm
(0.12 inch) in diameter. All mounting holes must be
circled. For corner sealing, a 3 or 6 mm (1/8 or 1/4
inch) drop is placed in the center of the gasket con-
tact area. Uncured sealant may be removed with a
shop towel. Components should be torqued in place
while the sealant is still wet to the touch (within 10
minutes). The use of a locating dowel is recom-
mended during assembly to prevent smearing the
material off location.

Mopar Gasket Maker should be applied sparingly

to one gasket surface. The sealant diameter should
be 1.00 mm (0.04 inch) or less. Be certain the mate-
rial surrounds each mounting hole. Excess material
can easily be wiped off. Components should be
torqued in place within 15 minutes. The use of a

Fig. 3 Oil Pressure Sending Unit

1 – BELT
2 – OIL PRESSURE SENSOR
3 – OIL FILTER
4 – ELEC. CONNECTOR

DN

4.7L ENGINE

9 - 15

DIAGNOSIS AND TESTING (Continued)

locating dowel is recommended during assembly to
prevent smearing the material off location.

ENGINE OIL

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.

ENGINE OIL SPECIFICATION

CAUTION: Do not use non-detergent or straight
mineral oil when adding or changing crankcase
lubricant. Engine failure can result.

API SERVICE GRADE CERTIFIED

Use an engine oil that is API Service Grade Certi-

fied. MOPAR

t provides engine oils that conform to

this service grade.

SAE VISCOSITY

An SAE viscosity grade is used to specify the vis-

cosity of engine oil. Use only engine oils with multi-
ple viscosities such as 5W-30 or 10W-30 in the 4.7L
engines. These are specified with a dual SAE viscos-
ity grade which indicates the cold-to-hot temperature
viscosity range. Select an engine oil that is best
suited to your particular temperature range and vari-
ation (Fig. 4).

ENERGY CONSERVING OIL

An Energy Conserving type oil is recommended for

gasoline engines. The designation of ENERGY CON-
SERVING is located on the label of an engine oil con-
tainer.

CONTAINER IDENTIFICATION

Standard engine oil identification notations have

been adopted to aid in the proper selection of engine
oil. The identifying notations are located on the label
of engine oil plastic bottles and the top of engine oil
cans (Fig. 5).

OIL LEVEL INDICATOR (DIPSTICK)

The engine oil level indicator is located at the right

rear of the engine on the 4.7L engines. (Fig. 6).

Fig. 4 Temperature/Engine Oil Viscosity—4.7L

Engine

Fig. 5 Engine Oil Container Standard Notations

Fig. 6 Engine Oil Dipstick 4.7L Engine

1 – TRANSMISSION DIPSTICK
2 – ENGINE OIL DIPSTICK
3 – ENGINE OIL FILL CAP

9 - 16

4.7L ENGINE

DN

SERVICE PROCEDURES (Continued)

CRANKCASE OIL LEVEL INSPECTION

CAUTION: Do not overfill crankcase with engine oil,
pressure loss or oil foaming can result.

Inspect engine oil level approximately every 800

kilometers (500 miles). Unless the engine has exhib-
ited loss of oil pressure, run the engine for about five
minutes before checking oil level. Checking engine oil
level on a cold engine is not accurate.

To ensure proper lubrication of an engine, the

engine oil must be maintained at an acceptable level.
The acceptable levels are indicated between the ADD
and SAFE marks on the engine oil dipstick.

(1) Position vehicle on level surface.
(2) With engine OFF, allow approximately ten min-

utes for oil to settle to bottom of crankcase, remove
engine oil dipstick.

(3) Wipe dipstick clean.
(4) Install dipstick and verify it is seated in the

tube.

(5) Remove dipstick, with handle held above the

tip, take oil level reading.

(6) Add oil only if level is below the ADD mark on

dipstick.

ENGINE OIL CHANGE

Change engine oil at mileage and time intervals

described in Maintenance Schedules.

Run engine until achieving normal operating tem-

perature.

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

engine off.

(2) Hoist and support vehicle on safety stands.
(3) Remove oil fill cap.
(4) Place a suitable drain pan under crankcase

drain.

(5) Remove drain plug from crankcase and allow

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

(6) Install drain plug in crankcase.
(7) Lower vehicle and fill crankcase with specified

type and amount of engine oil described in this sec-
tion.

(8) Install oil fill cap.
(9) Start engine and inspect for leaks.
(10) Stop engine and inspect oil level.

ENGINE OIL FILTER CHANGE

FILTER SPECIFICATION

All engines are equipped with a high quality full-

flow, disposable type oil filter. DaimlerChrysler Cor-
poration recommends a Mopar or equivalent oil filter
be used.

OIL FILTER REMOVAL

(1) Position a drain pan under the oil filter.
(2) Using a suitable oil filter wrench loosen filter.
(3) Rotate the oil filter counterclockwise (Fig. 7) to

remove it from the cylinder block oil filter boss.

(4) When filter separates from cylinder block oil

filter boss, tip gasket end upward to minimize oil
spill. Remove filter from vehicle.

(5) With a wiping cloth, clean the gasket sealing

surface of oil and grime.

OIL FILTER INSTALLATION

(1) Lightly lubricate oil filter gasket with engine

oil.

(2) Thread filter onto adapter nipple. When gasket

makes contact with sealing surface, (Fig. 8) hand
tighten filter one full turn, do not over tighten.

(3) Add oil, verify crankcase oil level and start

engine. Inspect for oil leaks.

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 at beginning of this
section.

REPAIR DAMAGED OR WORN THREADS

CAUTION: Be sure that the tapped holes maintain
the original center line.

Fig. 7 Oil Filter—4.7L Engine

1 – ENGINE OIL FILTER

DN

4.7L ENGINE

9 - 17

SERVICE PROCEDURES (Continued)

Damaged or worn threads can be repaired. Essen-

tially, this repair consists of:

• Drilling out worn or damaged threads.

• Tapping the hole with a special Heli-Coil Tap, or

equivalent.

• Installing an insert into the tapped hole to bring

the hole back to its original thread size.

CYLINDER BORE—HONING

Before honing, stuff plenty of clean shop towels

under the bores and over the crankshaft to keep
abrasive materials from entering the crankshaft
area.

(1) Used carefully, the Cylinder Bore Sizing Hone

C-823, equipped with 220 grit stones, is the best tool
for this job. In addition to deglazing, it will reduce
taper and out-of-round, as well as removing light
scuffing, scoring and scratches. Usually, a few strokes
will clean up a bore and maintain the required lim-
its.

CAUTION: DO NOT use rigid type hones to remove
cylinder wall glaze.

(2) Deglazing of the cylinder walls may be done if

the cylinder bore is straight and round. Use a cylin-
der surfacing hone, Honing Tool C-3501, equipped
with 280 grit stones (C-3501-3810). about 20-60
strokes, depending on the bore condition, will be suf-
ficient to provide a satisfactory surface. Using honing
oil C-3501-3880, or a light honing oil, available from
major oil distributors.

CAUTION: DO NOT use engine or transmission oil,
mineral spirits, or kerosene.

(3) Honing should be done by moving the hone up

and down fast enough to get a crosshatch pattern.

The hone marks should INTERSECT at 50° to 60°
for proper seating of rings (Fig. 9).

(4) A controlled hone motor speed between 200 and

300 RPM is necessary to obtain the proper cross-
hatch angle. The number of up and down strokes per
minute can be regulated to get the desired 50° to 60°
angle. Faster up and down strokes increase the cross-
hatch angle.

(5) After honing, it is necessary that the block be

cleaned to remove all traces of abrasive. Use a brush
to wash parts with a solution of hot water and deter-
gent. Dry parts thoroughly. Use a clean, white, lint-
free cloth to check that the bore is clean. Oil the
bores after cleaning to prevent rusting.

HYDROSTATIC LOCK

When an engine is suspected of hydrostatic lock

(regardless of what caused the problem), follow the
steps below.

(1) Perform the Fuel Pressure Release Procedure

(refer to Group 14, Fuel System).

(2) Disconnect the battery negative cable.
(3) Inspect

air

cleaner,

induction

system

and

intake manifold to ensure system is dry and clear of
foreign material.

(4) Place a shop towel around the spark plugs to

catch any fluid that may possibly be under pressure
in the cylinder head. Remove the plugs from the
engine.

CAUTION: DO NOT use the starter motor to rotate
the crankshaft. Severe damage could occur.

(5) With all spark plugs removed, rotate the crank-

shaft using a breaker bar and socket.

Fig. 8 Oil Filter Sealing Surface—Typical

1 – SEALING SURFACE
2 – RUBBER GASKET
3 – OIL FILTER

Fig. 9 Cylinder Bore Crosshatch Pattern

1 – CROSSHATCH PATTERN
2 – INTERSECT ANGLE

9 - 18

4.7L ENGINE

DN

SERVICE PROCEDURES (Continued)