Dodge Durango (HB). Manual - part 1029

REMOVAL

REMOVAL - LEFT

CAUTION: When the timing chain is removed and
the cylinder heads are still installed, DO NOT
forcefully rotate the camshafts or crankshaft inde-
pendently of each other. Severe valve and/or pis-
ton damage can occur.

CAUTION: When removing the cam sprocket, tim-
ing chains or camshaft, Failure to use Special Tool
8379 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 9 - ENGINE/

CYLINDER HEAD/CYLINDER HEAD COVER(S) -
REMOVAL).

2. Set engine to TDC cylinder No. 1, camshaft

sprocket V6 marks (1) at the 12 o’clock position.

3. Mark one link on the secondary timing chain on

both sides of the V6 mark on the camshaft sprocket to aid in installation.

CAUTION: Do not hold or pry on the camshaft target 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 be secured prior to removing the camshaft sprockets. Failure to
secure tensioners will allow the tensioners 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 tension-
ers may occur.

5. Position Special Tool 8379 timing chain wedge (1)

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

ENGINE - 3.7L SERVICE INFORMATION

9 - 1115

6. Hold the camshaft with Special Tool 8428 Camshaft

Wrench (2), while removing the camshaft sprocket
bolt and sprocket.

7. Using Special Tool 8428 Camshaft Wrench (2),

gently allow the camshaft to rotate 5° clockwise
until the camshaft is in the neutral 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.

9. Remove the camshaft bearing caps and the

camshaft.

CAMSHAFT-RIGHT

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

CAUTION: When removing the cam sprocket, timing chains or camshaft, Failure to use special tool 8379 will
result in hydraulic tensioner ratchet over extension, Requiring timing chain cover removal to re-set the ten-
sioner ratchet.

1. Remove the cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) -

REMOVAL).

2. Set engine to TDC cylinder No. 1, camshaft sprocket V6 marks at the 12 o’clock position.

3. Mark one link on the secondary timing chain on both sides of the V6 mark on the camshaft sprocket to aid in

installation.

CAUTION: Do not hold or pry on the camshaft target wheel for any reason, Severe damage will occur to the
target wheel. A damaged target wheel could cause a vehicle no start condition.

4. Loosen but DO NOT remove the camshaft sprocket retaining bolt. Leave bolt snug against sprocket.

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

5. Position Tool 8379 timing chain wedge between the timing chain strands. Tap the tool to securely wedge the

timing chain against the tensioner arm and guide.

6. Remove the camshaft position sensor.

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ENGINE - 3.7L SERVICE INFORMATION

7. Hold the camshaft with Tool 8428 Camshaft Wrench, while removing the camshaft sprocket bolt and sprocket.

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 CAMSHAFT 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.

9. Remove the camshaft bearing caps and the camshaft.

INSTALLATION

INSTALLATION - LEFT

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
position, This will place the camshaft at the neu-
tral 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.

NOTE: Caps should be installed so that the
stamped numbers on the caps are in numerical
order, ( 1 thru 4 ) from the front to the rear of the
engine. All caps should be installed so that the
stamped arrows on the caps point toward the front
of the engine.

4. Working in 1/2 turn increments, tighten the bearing

cap retaining bolts starting with the middle cap
working outward.

5. Torque the camshaft bearing cap retaining bolts to

11 N·m (100 in. lbs.).

6. Position the camshaft drive gear into the timing chain aligning the V6 mark between the two marked chain links

(Two links marked during removal).

7. Using Tool 8428 Camshaft Wrench, rotate the camshaft until the camshaft sprocket dowel is aligned with the slot

in the camshaft sprocket. Install the sprocket onto the camshaft.

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 8379 timing chain wedge.

10. Using Special Tool 6958 spanner wrench with adapter pins 8346, torque the camshaft sprocket retaining bolt to

122 N·m (90 ft. lbs.).

11. Install the cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) -

INSTALLATION).

ENGINE - 3.7L SERVICE INFORMATION

9 - 1117

CAMSHAFT-RIGHT

1. Lubricate camshaft journals with clean engine oil.

NOTE: Position the right side camshaft so that the
camshaft sprocket dowel is near the 10 o’clock
position, This will place the camshaft at the neu-
tral 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 1/2 turn increments, tighten the bearing

cap retaining bolts starting with the middle cap
working outward as shown.

5. Torque the camshaft bearing cap retaining bolts to

11 N·m (100 in. lbs.).

6. Position the camshaft drive gear into the timing chain aligning the V6 mark between the two marked chain links

(Two links marked during removal).

7. Using Special Tool 8428 Camshaft Wrench, rotate the camshaft until the camshaft sprocket dowel is aligned with

the slot in the camshaft sprocket. Install the sprocket onto the camshaft.

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 camshaft sprocket bolt, then install the camshaft sprocket retaining bolt and hand

tighten.

9. Remove timing chain wedge Ttool 8379.

10. Using Tool 6958 spanner wrench with adapter pins 8346, torque the camshaft sprocket retaining bolt to 122

N·m (90 ft. lbs.).

11. Install the camshaft position sensor.

12. Install the cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) -

INSTALLATION).

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ENGINE - 3.7L SERVICE INFORMATION

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