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Dodge Durango (DN). Manual - part 431

(24) Coat the large threaded access plug with

Mopar

t Thread Sealant with Teflon, then install

into the right cylinder head and tighten to 81 N·m
(60 ft. lbs.) (Fig. 77).

(25) Install the oil fill housing.
(26) Install access plug in left cylinder head (Fig.

77).

(27) Install power steering pump. Refer to Group

19, Steering for procedure.

(28) Install radiator fan shroud. Refer to Group 7,

Cooling System for procedure.

(29) Fill cooling system. Refer to Group 7, Cooling

System for coolant fill procedure.

(30) Connect negative cable to battery.

IDLER SHAFT—TIMING DRIVE

REMOVAL

(1) Remove the timing chain and sprockets. Refer

to procedure in this section.

NOTE: To remove the idler shaft, it is necessary to
tap threads into the shaft to install the removal tool.

(2) Using a 12 mm X 1.75 tap, cut threads in the

idler shaft center bore (Fig. 89).

(3) Cover the radiator core with a suitable cover.

CAUTION: Use care when removing idler shaft, DO
NOT strike the radiator cooling fins with the slide
hammer.

(4) Using Special Tool 8517 Slide Hammer, remove

the idler shaft (Fig. 90).

Fig. 87 Tightening Right Side Camshaft Sprocket

Bolt

1 – TORQUE WRENCH
2 – SPECIAL TOOL 6958 WITH ADAPTER PINS 8346
3 – LEFT CAMSHAFT SPROCKET
4 – RIGHT CAMSHAFT SPROCKET

Fig. 88 Measuring Idler Gear End Play

1 – IDLER SPROCKET ASSEMBLY
2 – DIAL INDICATOR

Fig. 89 Tapping Idler Shaft For Special Tool 8517

1 – IDLER SHAFT
2 – TAP 12mm X 1.75

4.7L ENGINE

9 - 55

REMOVAL AND INSTALLATION (Continued)

INSTALLATION

(1) Thoroughly clean the idler shaft bore.
(2) Position the idler shaft in the bore.

NOTE: The two lubrication holes in the idler shaft
do not require any special alignment.

NOTE: Before using the retaining bolt to install the
idler shaft, coat the threads and the pilot on the
idler shaft with clean engine oil.

(3) Using the primary idler sprocket retaining bolt

and washer, carefully draw the idler shaft into the
bore until fully seated.

(4) Coat the idler shaft with clean engine oil and

install the timing chains and sprockets. Refer to pro-
cedure in this section.

CAMSHAFTS—IN VEHICLE

LEFT CAMSHAFT

REMOVAL

CAUTION: When the timing chain is removed and
the cylinder heads are still installed, DO NOT force-
fully rotate the camshafts or crankshaft indepen-
dently of each other. Severe valve and/or piston
damage can occur.

CAUTION: When removing the cam sprocket, tim-
ing chains or camshaft, Failure to use Special Tool
8350 will result in hydraulic tensioner ratchet over
extension, requiring timing chain cover removal to
reset the tensioner ratchet.

(1) Remove cylinder head cover. Refer to Cylinder

Head Cover in this section.

(2) Set engine to TDC cylinder #1, camshaft

sprocket V8 marks at the 12 o’clock position.

(3) Mark one link on the secondary timing chain

on both sides of the V8 mark on the camshaft
sprocket to aid in installation.

CAUTION: Do not hold or pry on the camshaft tar-
get wheel (Located on the right side camshaft
sprocket) for any reason, Severe damage will occur
to the target wheel resulting in a vehicle no start
condition.

(4) Loosen but DO NOT remove the camshaft

sprocket retaining bolt. Leave the bolt snug against
the sprocket.

NOTE: The

timing

chain

tensioners

must

secured prior to removing the camshaft sprockets.
Failure to secure tensioners will allow the tension-
ers to extend, requiring timing chain cover removal
in order to reset tensioners.

CAUTION: Do not force wedge past the narrowest
point between the chain strands. Damage to the
tensioners may occur.

(5) Position Special Tool 8350 timing chain wedge

between the timing chain strands, tap the tool to
securely wedge the timing chain against the ten-
sioner arm and guide (Fig. 91).

(6) Hold the camshaft with adjustable pliers while

removing the camshaft sprocket bolt and sprocket
(Fig. 92).

(7) Using the pliers, gently allow the camshaft to

rotate 15° clockwise until the camshaft is in the neu-
tral position (no valve load).

(8) Starting at the outside working inward, loosen

the camshaft bearing cap retaining bolts 1/2 turn at
a time. Repeat until all load is off the bearing caps.

CAUTION: DO NOT STAMP OR STRIKE THE CAM-
SHAFT BEARING CAPS. SEVERE DAMAGE WILL
OCCUR TO THE BEARING CAPS.

NOTE: When the camshaft is removed the rocker
arms may slide downward, mark the rocker arms
before removing camshaft.

Fig. 90 Removing Idler Shaft

1 – IDLER SHAFT
2 – SPECIAL TOOL 8517

9 - 56

4.7L ENGINE

REMOVAL AND INSTALLATION (Continued)

(9) Remove the camshaft bearing caps and the

camshaft.

INSTALLATION

(1) Lubricate camshaft journals with clean engine

oil.

NOTE: Position the left side camshaft so that the
camshaft sprocket dowel is near the 1 o’clock posi-
tion, This will place the camshaft at the neutral
position easing the installation of the camshaft
bearing caps.

(2) Position the camshaft into the cylinder head.
(3) Install the camshaft bearing caps, hand tighten

the retaining bolts.

(4) Working in

⁄

turn increments, tighten the

bearing cap retaining bolts starting with the middle
cap working outward (Fig. 93).

(5) Torque the camshaft bearing cap retaining

bolts to 11 N·m (100 in. lbs.).

(6) Position the camshaft drive gear into the tim-

ing chain aligning the V8 mark between the two
marked

chain

links

(Two

links

marked

during

removal) (Fig. 94).

(7) Using the adjustable pliers, rotate the cam-

shaft until the camshaft sprocket dowel is aligned
with the slot in the camshaft sprocket. Install the
sprocket onto the camshaft (Fig. 95).

Fig. 91 Securing Timing Chain Tensioners Using Timing Chain Wedge

1 – LEFT CYLINDER HEAD
2 – RIGHT CYLINDER HEAD

3 – SPECIAL TOOL 8350 WEDGE
4 – SPECIAL TOOL 8350 WEDGE

Fig. 92 Camshaft Sprocket and Chain

1 – CAMSHAFT SPROCKET AND CHAIN
2 – ADJUSTABLE PLIERS
3 – CAMSHAFT

4.7L ENGINE

9 - 57

REMOVAL AND INSTALLATION (Continued)

CAUTION: Remove

excess

oil

from

camshaft

sprocket bolt. Failure to do so can cause bolt over-
torque resulting in bolt failure.

(8) Remove excess oil from bolt, then install the

camshaft sprocket retaining bolt and hand tighten.

(9) Remove Special Tool 8350 timing chain wedge

(Fig. 91).

(10) Using Special Tool 6958 spanner wrench with

adapter pins 8346 (Fig. 96), torque the camshaft
sprocket retaining bolt to 122 N·m (90 ft. lbs.).

(11) Install the cylinder head cover.

RIGHT CAMSHAFT

REMOVAL

CAUTION: When removing the cam sprocket, tim-
ing chains or camshaft, Failure to use special tool
8350 will result in hydraulic tensioner ratchet over
extension, Requiring timing chain cover removal to
re-set the tensioner ratchet.

(1) Remove the cylinder head covers. Refer to Cyl-

inder Head Cover in this section.

Fig. 94 Timing Chain to Sprocket Alignment

1 – LEFT CYLINDER HEAD
2 – RIGHT CYLINDER HEAD

Fig. 93 Camshaft Bearing Caps Tightening

Sequence

9 - 58

4.7L ENGINE

REMOVAL AND INSTALLATION (Continued)

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