Dodge Durango (DN). Manual — part 424

(9) Repeat the Plastigage measurement to verify

your bearing selection prior to final assembly.

(10) Once you have selected the proper insert,

install the insert and cap. Tighten the connecting rod
bolts to 27 N·m (20 ft. lbs.) plus a 90° turn.

Slide snug-fitting feeler gauge between the con-

necting rod and crankshaft journal flange (Fig. 30).
Refer to Engine Specifications for the proper clear-
ance. Replace the connecting rod if the side clearance
is not within specification.

CRANKSHAFT MAIN BEARINGS

INSPECTION

Wipe the inserts clean and inspect for abnormal

wear patterns and for metal or other foreign material
imbedded in the lining. Normal main bearing insert
wear patterns are illustrated (Fig. 31).

NOTE: If any of the crankshaft journals are scored,
remove the engine for crankshaft repair.

Inspect the back of the inserts for fractures, scrap-

ings or irregular wear patterns.

Inspect the upper insert locking tabs for damage.
Replace all damaged or worn bearing inserts.

MAIN BEARING JOURNAL DIAMETER
(CRANKSHAFT REMOVED)

Remove the crankshaft from the cylinder block.

Refer to Crankshaft in this section for procedure.

Clean the oil off the main bearing journal.
Determine the maximum diameter of the journal

with a micrometer. Measure at two locations 90°
apart at each end of the journal.

The maximum allowable taper is 0.008mm (0.0004

inch.) and maximum out of round is 0.005mm (0.002
inch). Compare the measured diameter with the jour-

Fig. 29 Measuring Bearing Clearance with

Plastigage

1 – PLASTIGAGE SCALE
2 – COMPRESSED PLASTIGAGE

Bearing

Mark

SIZE

USED WITH

JOURNAL SIZE

.025 US

.025 mm

50.983-50.967 mm

(.001 in.)

(2.0073-2.0066 in.)

Std.

STANDARD

50.992-51.008 mm

(2.0076-2.0082 in.)

.250 US

.250 mm

50.758-50.742 mm

(.010 in.)

(1.9984-1.9978 in.)

Fig. 30 Checking Connecting Rod Side Clearance—

Typical

Fig. 31 Main Bearing Wear Patterns

1 – UPPER INSERT
2 – NO WEAR IN THIS AREA
3 – LOW AREA IN BEARING LINING
4 – LOWER INSERT

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4.7L ENGINE

9 - 27

SERVICE PROCEDURES (Continued)

nal diameter specification (Main Bearing Fitting
Chart). Select inserts required to obtain the specified
bearing-to-journal clearance.

Install the crankshaft into the cylinder block. Refer

to Crankshaft in this section for procedure.

CRANKSHAFT MAIN BEARING SELECTION

(1) Service main bearings are available in three

grades. The chart below identifies the three service
grades available.

REMOVAL AND INSTALLATION

ENGINE MOUNTS—LEFT AND RIGHT

REMOVAL

(1) Disconnect the negative cable from the battery.

CAUTION: Remove the fan blade, fan clutch and
fan shroud before raising engine. Failure to do so
may cause damage to the fan blade, fan clutch and
fan shroud.

(2) Remove the fan blade, fan clutch and fan

shroud. Refer to Group 7. for procedure.

(3) Remove the engine oil filter.
(4) Support the engine with a suitable jack and a

block of wood across the full width of the engine oil
pan.

(5) Remove the four (4) cylinder block-to-insulator

mount bolts and the nut from the engine insulator
mount through bolt (4x2 Vehicles only) (Fig. 32) (Fig.
33).

(6) Remove the three (3) cylinder block-to-insulator

mount bolts and loosen the nut from the engine insu-
lator mount through bolt (4x4 Vehicles only) (Fig. 34)
(Fig. 35).

(7) Using the jack, raise the engine high enough to

remove the engine insulator mount through bolt and
the insulator mount.

INSTALLATION

(1) Position the insulator mount and install the

insulator mount through bolt.

(2) Lower the engine until the four cylinder block-

to-insulator mount bolts can be installed.

(3) Remove the jack and block of wood.
(4) Torque the cylinder block-to-insulator mount

bolts to 61N·m ( 45 ft. lbs.).

(5) Install and torque the through bolt retaining

nut to 61N·m (45 ft. lbs.).

(6) Install the fan blade, fan clutch and fan

shroud.

GRADE

SIZE mm

(in.)

FOR USE WITH

MARKING

JOURNAL SIZE

A

.008 mm U/S

63.488-63.496 mm

(.0004 in.)

U/S

(2.4996-2.4999 in.)

B

STANDARD

63.496-63.504 mm

(2.4996-2.4999 in.)

C

.008 mm O/S

63.504-63.512 mm

(.0004 in.)

O/S

(2.5002-2.5005 in.)

Fig. 32 Engine Insulator Mount 4x2 Vehicle—Left

Side

1 – ENGINE INSULATOR MOUNT-LEFT SIDE
2 – MOUNTING BOLT

Fig. 33 Engine Insulator Mount 4x2 Vehicle—Right

Side

1 – ENGINE INSULATOR MOUNT-RIGHT SIDE
2 – MOUNTING BOLT

9 - 28

4.7L ENGINE

DN

SERVICE PROCEDURES (Continued)

ENGINE MOUNT—REAR

REMOVAL

(1) Raise vehicle on hoist.
(2) Using a suitable jack, support transmission.
(3) Remove the nut from the insulator mount

through bolt (Manual transmission and 4x2 auto-
matic transmission only) (Fig. 36) (Fig. 37).

(4) Remove the four bolts and washers retaining

the mount to the transmission (4x4 automatic trans-
mission only) (Fig. 38).

(5) Raise the transmission enough to remove the

through bolt (Manual transmission and 4x2 auto-
matic transmission only) (Fig. 36) (Fig. 37).

(6) Raise the transmission and remove the bolts

retaining the mount to the crossmember (4x4 auto-
matic transmission only) (Fig. 38).

(7) Remove the two nuts retaining the isolator to

the crossmember (Manual transmission and 4x2
automatic transmission only) (Fig. 36) (Fig. 37).

(8) Remove the bolts (two bolts manual transmis-

sion)(three bolts 4x2 automatic transmission) retain-
ing the insulator bracket to the transmission.

INSTALLATION

(1) Follow the removal procedure in the reverse

order.

(2) Tighten the through bolt retaining nut to 102

N·m (75 ft. lbs.).

(3) Tighten the isolator bracket to transmission

retaining bolts (Manual transmission and 4x2 auto-
matic transmission only) to 41 N·m (30 ft. lbs.).

(4) Tighten the mount bracket to transmission

retaining bolts (4x4 automatic transmission only) to
68 N·m (50 ft. lbs.).

(5) Tighten the isolator mount to crossmember

retaining nuts (Manual transmission and 4x2 auto-
matic transmission only) to 28 N·m (250 in. lbs.).

Fig. 34 Engine Insulator Mount 4x4 Vehicle—Left

Side

1 – ENGINE INSULATOR MOUNT-LEFT SIDE
2 – MOUNTING BOLT

Fig. 35 Engine Insulator Mount 4x4 Vehicle—Right

Side

1 – ENGINE INSULATOR MOUNT-RIGHT SIDE
2 – MOUNTING BOLT

Fig. 36 Engine Rear Mount—4X2 Automatic

Transmission

1 – ENGINE REAR MOUNT
2 – BOLT
3 – NUT
4 – THROUGH BOLT NUT
5 – TRANSMISSION

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4.7L ENGINE

9 - 29

REMOVAL AND INSTALLATION (Continued)

(6) Tighten the mount bracket to crossmember

retaining bolts (4x4 automatic transmission only) to
28 N·m (250 in. lbs.).

STRUCTURAL COVER

REMOVAL

(1) Raise vehicle on hoist.
(2) Remove the left hand exhaust pipe from

exhaust manifold. Refer to Group 11, Exhaust Sys-
tem.

(3) Loosen the right hand exhaust manifold-to-ex-

haust pipe retaining bolts.

(4) Remove the eight bolts retaining structural

cover (Fig. 39).

(5) Pivot the exhaust pipe downward and remove

the structural cover.

INSTALLATION

CAUTION: The structural cover must be installed
as described in the following steps. Failure to do so
will cause severe damage to the cover.

(1) Position the structural cover in the vehicle.
(2) Install all four bolts retaining the cover-to-en-

gine. DO NOT tighten the bolts at this time.

(3) Install the four cover-to-transmission bolts. Do

NOT tighten at this time.

CAUTION: The structural cover must be held tightly
against both the engine and the transmission bell
housing during tightening sequence. Failure to do
so may cause damage to the cover.

(4) Starting with the two rear cover-to-engine

bolts, tighten bolts (1) (Fig. 39) to 54 N·m (40 ft. lbs.),
then tighten bolts (2) (Fig. 39) and (3) to 54 N·m ( 40
ft. lbs.) in the sequence shown.

(5) Install the exhaust pipe on left hand exhaust

manifold.

(6) Tighten

exhaust

manifold-to-exhaust

pipe

retaining bolts to 20–26 N·m (15–20 ft. lbs.).

Fig. 37 Engine Rear Mount—4X2 and 4X4 Manual

Transmission

1 – THROUGH BOLT
2 – BOLT
3 – INSULATOR SUPPORT
4 – NUT
5 – NUT AND WASHER
6 – INSULATOR BRACKET TO TRANSMISSION

Fig. 38 Engine Rear Mount—4X4 Automatic

Transmission

1 – TRANSMISSION
2 – ENGINE REAR MOUNT
3 – BOLT

Fig. 39 Structural Cover

9 - 30

4.7L ENGINE

DN

REMOVAL AND INSTALLATION (Continued)