Dodge Durango (DN). Manual — part 430
CAUTION: Care should be taken not to damage
camshaft target wheel. Do not hold target wheel
while loosening or tightening camshaft sprocket.
Do not place the target wheel near a magnetic
source of any kind. A damaged or magnetized tar-
get wheel could cause a vehicle no start condition.
CAUTION: Do not forcefully rotate the camshafts or
crankshaft independently of each other. Damaging
intake valve to piston contact will occur. Ensure
negative battery cable is disconnected to guard
against accidental starter engagement.
(13) Remove left and right camshaft sprocket bolts.
(14) While holding the left camshaft steel tube
with adjustable pliers, (Fig. 80) remove the left cam-
shaft sprocket. Slowly rotate the camshaft approxi-
mately 15 degrees clockwise to a neutral position.
(15) While holding the right camshaft steel tube
with adjustable pliers, (Fig. 81) remove the right
camshaft
sprocket.
Slowly
rotate
the
camshaft
approximately 45 degrees counterclockwise to a neu-
tral position.
(16) Remove idler sprocket assembly bolt.
(17) Slide the idler sprocket assembly and crank
sprocket forward simultaneously to remove the pri-
mary and secondary chains.
(18) Remove both pivoting tensioner arms and
chain guides.
(19) Remove chain tensioner.
Fig. 79 Camshaft Position Sensor—Removal
1 – CRANKSHAFT POSITION SENSOR
2 – CYLINDER HEAD COVER
3 – CAMSHAFT POSITION SENSOR
4 – RIGHT SIDE CYLINDER BLOCK
Fig. 80 Camshaft Rotation—Left Side
1 – CAMSHAFT SPROCKET AND CHAIN
2 – ADJUSTABLE PLIERS
3 – CAMSHAFT
Fig. 81 Camshaft Rotation—Right Side
1 – ADJUSTABLE PLIERS
2 – CAMSHAFT DOWEL
DN
4.7L ENGINE
9 - 51
REMOVAL AND INSTALLATION (Continued)
INSPECTION OF COMPONENTS
Inspect the following components:
• Sprockets for excessive tooth wear. Some tooth
markings are normal and not a cause for sprocket
replacement.
• Idler sprocket assembly bushing and shaft for
excessive wear.
• Idler sprocket assembly spline joint. The joint
should be tight with no backlash or axial movement.
• Chain guides and tensioner arms. Replace these
parts if grooving in plastic face is more than 1 mm
(0.039 in.) deep. If plastic face is severely grooved or
melted, the tensioner lube jet may be clogged. The
tensioner should be replaced.
• secondary chain tensioner piston and ratcheting
device. Inspect for evidence of heavy contact between
tensioner piston and tensioner arm. If this condition
exist the tensioner tensioner arm and chain should
be replaced.
• Primary chain tensioner plastic faces. Replace as
required.
INSTALLATION
(1) Using a vise, lightly compress the secondary
chain tensioner piston until the piston step is flush
with the tensioner body. Using a pin or suitable tool,
release ratchet pawl by pulling pawl back against
spring force through access hole on side of tensioner.
While continuing to hold pawl back, Push ratchet
device to approximately 2 mm from the tensioner
body. Install Special Tool 8514 lock pin into hole on
front of tensioner. Slowly open vise to transfer piston
spring force to lock pin (Fig. 83).
(2) Position primary chain tensioner over oil pump
and insert bolts into lower two holes on tensioner
bracket. Tighten bolts to 28 N·m (250 in. lbs.).
Fig. 82 Timing Chain System
1 – RIGHT CAMSHAFT SPROCKET AND SECONDARY CHAIN
2 – SECONDARY TIMING CHAIN TENSIONER
3 – SECONDARY TENSIONER ARM
4 – LEFT CAMSHAFT SPROCKET AND SECONDARY CHAIN
5 – CHAIN GUIDE
6 – TWO PLATED LINKS ON RIGHT CAMSHAFT CHAIN
7 – PRIMARY CHAIN
8 – IDLER SPROCKET
9 – CRANKSHAFT SPROCKET
10 – PRIMARY CHAIN TENSIONER
11 – TWO PLATED LINKS ON LEFT CAMSHAFT CHAIN
12 – SECONDARY TENSIONER ARM
9 - 52
4.7L ENGINE
DN
REMOVAL AND INSTALLATION (Continued)
CAUTION: Overtightening the tensioner arm torx
T
bolt can cause severe damage to the cylinder head.
Tighten torx
T
bolt to specified torque only.
(3) Install right side chain tensioner arm. Apply
Mopar
t Lock N, Seal to torxt bolt, tighten bolt to 17
N·m (150 in. lbs.).
NOTE: The silver bolts retain the guides to the cyl-
inder heads and the black bolts retain the guides to
the engine block.
(4) Install the left side chain guide. Tighten the
bolts to 28 N·m (250 in. lbs.).
CAUTION: Overtightening the tensioner arm torx
T
bolt can cause severe damage to the cylinder head.
Tighten torx
T
bolt to specified torque only.
(5) Install left side chain tensioner arm. Apply
Mopar
t Lock N, Seal to torxt bolt, tighten bolt to 17
N·m (150 in. lbs.).
(6) Install the right side chain guide. Tighten the
bolts to 28 N·m (250 in. lbs.).
(7) Install both secondary chains onto the idler
sprocket. Align two plated links on the secondary
chains to be visible through the two lower openings
on the idler sprocket (4 o’clock and 8 o’clock). Once
the secondary timing chains are installed, position
special tool 8515 to hold chains in place for installa-
tion (Fig. 84).
(8) Align primary chain double plated links with
the timing mark at 12 o’clock on the idler sprocket.
Align the primary chain single plated link with the
timing mark at 6 o’clock on the crankshaft sprocket
(Fig. 82).
(9) Lubricate idler shaft and bushings with clean
engine oil.
(10) Install all chains, crankshaft sprocket, and
idler sprocket as an assembly (Fig. 85). After guiding
both secondary chains through the block and cylinder
head openings, affix chains with a elastic strap or the
equivalent, This will maintain tension on chains to
aid in installation.
NOTE: It will be necessary to slightly rotate cam-
shafts for sprocket installation.
(11) Align left camshaft sprocket “L” dot to plated
link on chain.
(12) Align right camshaft sprocket “R” dot to
plated link on chain.
CAUTION: Remove excess oil from the camshaft
sprocket bolt. Failure to do so can result in over-
torque of bolt resulting in bolt failure.
Fig. 83 Resetting Secondary Chain Tensioners
1 – VISE
2 – INSERT LOCK PIN
3 – RATCHET PAWL
4 – RATCHET
5 – PISTON
Fig. 84 Installing Secondary Timing Chains on Idler
Sprocket
1 – LOCK ARM
2 – RIGHT CAMSHAFT CHAIN
3 – SECONDARY CHAINS RETAINING PINS (4)
4 – IDLER SPROCKET
5 – LEFT CAMSHAFT CHAIN
6 – SPECIAL TOOL 8515
DN
4.7L ENGINE
9 - 53
REMOVAL AND INSTALLATION (Continued)
(13) Remove Special Tool 8515, then attach both
sprockets to camshafts. Remove excess oil from bolts,
then Install sprocket bolts, but do not tighten at this
time.
(14) Verify that all plated links are aligned with
the marks on all sprockets and the “V8” marks on
camshaft sprockets are at the 12 o’clock position (Fig.
82).
CAUTION: Ensure the plate between the left sec-
ondary chain tensioner and block is correctly
installed.
(15) Install
both
secondary
chain
tensioners.
Tighten bolts to 28 N·m (250 in. lbs.).
NOTE: Left and right secondary chain tensioners
are not common.
(16) Before installing idler sprocket bolt, lubricate
washer with oil, and tighten idler sprocket assembly
retaining bolt to 34 N·m (25 ft. lbs.).
(17) Remove all locking pins (3) from tensioners.
CAUTION: After pulling locking pins out of each
tensioner, DO NOT manually extend the tensioner(s)
ratchet. Doing so will over tension the chains,
resulting in noise and/or high timing chain loads.
(18) Using Special Tool 6958, Spanner with Adap-
tor Pins 8346, tighten left (Fig. 86) and right (Fig.
87). camshaft sprocket bolts to 122 N·m (90 ft. lbs.).
(19) Rotate engine two full revolutions. Verify tim-
ing marks are at the follow locations:
• primary chain idler sprocket dot is at 12 o’clock
(Fig. 82)
• primary chain crankshaft sprocket dot is at 6
o’clock (Fig. 82)
• secondary chain camshaft sprockets “V8” marks
are at 12 o’clock (Fig. 82)
(20) Lubricate all three chains with engine oil.
(21) After installing all chains, it is recommended
that the idler gear end play be checked (Fig. 88). The
end play must be within 0.10–0.25 mm (0.004–0.010
in.). If not within specification, the idler gear must be
replaced.
(22) Install timing chain cover and crankshaft
damper. Refer to procedures in this section.
(23) Install cylinder head covers. Refer to proce-
dures in this section.
NOTE: Before installing threaded plug in right cyl-
inder head, the plug must be coated with sealant to
prevent leaks.
Fig. 85 Installing Idler Gear, Primary and Secondary
Timing Chains
1 – SPECIAL TOOL 8515
2 – PRIMARY CHAIN IDLER SPROCKET
3 – CRANKSHAFT SPROCKET
Fig. 86 Tightening Left Side Camshaft Sprocket Bolt
1 – TORQUE WRENCH
2 – CAMSHAFT SPROCKET
3 – LEFT CYLINDER HEAD
4 – SPECIAL TOOL 6958 SPANNER WITH ADAPTER PINS 8346
9 - 54
4.7L ENGINE
DN
REMOVAL AND INSTALLATION (Continued)
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