Chrysler Pacifica. Manual — part 671
(9) Install the camshaft gear and align the timing
marks.
(10) Install the timing belt (Refer to 9 - ENGINE/
VALVE
TIMING/TIMING
BELT/CHAIN
AND
SPROCKETS - INSTALLATION).
(11) Install the rocker arm assembly.
(12) Install the cylinder head cover.
(13) Install the front timing belt cover (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT / CHAIN
COVER(S) - INSTALLATION).
(14) Install the vibration damper (Refer to 9 -
ENGINE/ENGINE BLOCK/VIBRATION DAMPER -
INSTALLATION).
(15) Fill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(16) Connect the negative battery cable.
CAMSHAFT(S)
DESCRIPTION
A single overhead camshaft per cylinder head pro-
vides valve actuation. The left camshaft accommo-
dates a cam sensor pick-up wheel and is therefore
longer. Each camshaft is supported by four bearing
journals. A thrust plate attached to the rear of each
cylinder head controls camshaft end play. Right and
left camshaft driving sprockets support a timing
mark, are keyed, and not interchangeable because of
the cam sensor pick-up wheel on the left sprocket.
Camshaft bearing lubrication is provided via a oil
supply passage through each rocker shaft pedestal
dowel.
OPERATION
The camshaft is driven by the crankshaft via drive
sprockets and belt. The camshaft has precisely
machined lobes to provide accurate valve timing and
duration.
REMOVAL
NOTE: Camshafts are removed from the rear of
each cylinder head.
(1) Remove
the
cylinder
head
(Refer
to
9
-
ENGINE/CYLINDER HEAD - REMOVAL).
CAUTION: Care must be taken not to nick or
scratch the journals when removing the camshaft.
(2) Carefully remove the camshaft from the rear of
the cylinder head (Fig. 34).
INSPECTION
(1) Inspect camshaft bearing journals for damage
and binding. If journals are binding, check the cylin-
der head for damage. Also check cylinder head oil
holes for clogging.
(2) Check the cam lobe and bearing surfaces for
abnormal wear and damage. Replace camshaft if
defective.
NOTE: If camshaft is replaced due to lobe wear or
damage, always replace the rocker arms.
Fig. 34 CYLINDER HEAD, CAMSHAFT AND ROCKER
ARM
1 - SPARK PLUG TUBE
2 - ROCKER ARM ASSEMBLY
3 - CAMSHAFT
4 - SEAL
CS
ENGINE 3.5L
9 - 39
SEAL -CAMSHAFT OIL (Continued)
(3) Measure the lobe actual wear (Fig. 35) and replace
camshaft if out of limit. Standard value is 0.0254 mm
(0.001 in.), wear limit is 0.254 mm (0.010 in.).
INSTALLATION
NOTE: Care must be taken not to scrape or nick the
camshaft journals when installing the camshaft into
position.
(1) Lubricate camshaft bearing journals, camshaft
lobes and camshaft seal with clean engine oil and
install camshaft into cylinder head (Fig. 34).
(2) Install the cylinder head (Refer to 9 - ENGINE/
CYLINDER HEAD - INSTALLATION).
CYLINDER HEAD COVER -
LEFT
REMOVAL
WARNING: DO NOT START OR RUN ENGINE WITH CYL-
INDER HEAD COVER REMOVED FROM THE ENGINE.
DAMAGE OR PERSONAL INJURY MAY OCCUR.
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the upper intake manifold from the
engine (Refer to 9 - ENGINE/MANIFOLDS/INTAKE
MANIFOLD - REMOVAL).
(3) Cover lower intake manifold with a suitable
cover during service.
(4) Disconnect and remove the three ignition coils
(Fig. 36).
Fig. 35 Camshaft Inspection
1 - ACTUAL WEAR
2 - LEFT CAMSHAFT
3 - RIGHT CAMSHAFT
4 - BEARING JOURNAL
5 - LOBE
Fig. 36 IGNITION COILS
1 - ELECTRICAL CONNECTORS
3 - CYLINDER HEAD COVER
2 - IGNITION COILS
4 - BRACKET
9 - 40
ENGINE 3.5L
CS
CAMSHAFT(S) (Continued)
(5) Remove the upper intake manifold support
brackets from the front and rear of the engine.
(6) Lift up on the wire harness track retaining
tabs (Fig. 37).
(7) Remove the ground strap/resistor retaining bolt
from the cylinder head cover.
(8) Completely loosen the cylinder head cover
retaining bolts and remove the cylinder head cover
(Fig. 38).
(9) Remove the PCV valve from the valve cover
assembly (if required).
INSTALLATION
(1) Clean cylinder head and cover mating surfaces.
Inspect and replace gasket and seals as necessary
(Fig. 39).
(2) To replace spark plug tube seals:
(a) Using a suitable pry tool, carefully remove
tube seals.
(b) Position new seal with the part number on
seal facing cylinder head cover.
(c) Install seals using Special Tool MD-998306
(Fig. 40).
(3) Install PCV valve (if required)
(4) Install cylinder head cover and bolts. Tighten
to 12 N·m (105 in. lbs.).
(5) Position the wiring harness on the cylinder
head cover.
(6) Reclip the wire harness track retaining tabs
into the cover (Fig. 37).
(7) Install the ground strap/resistor retaining bolt
onto the cylinder head cover.
Fig. 37 WIRING HARNESS RETAINING TABS
1 - PUSH TABS
2 - WIRING HARNESS
Fig. 38 Cylinder Head Covers
1 - CYLINDER HEAD COVER-LEFT SIDE
2 - BOLTS (8)
Fig. 39 Cylinder Head Cover Gasket and Spark Plug
Tube Seals
1 - CYLINDER HEAD COVER GASKET
2 - SPARK PLUG TUBE SEALS
Fig. 40 Spark Plug Tube Seal Installation
1 - SPECIAL TOOL MD-998306
2 - SPARK PLUG TUBE SEAL
CS
ENGINE 3.5L
9 - 41
CYLINDER HEAD COVER - LEFT (Continued)
(8) Install the upper intake manifold support
brackets onto the front and rear of the engine.
(9) Install the ignition coils. Tighten mounting
screws to 6.7 N.m (60 in. lbs.) (Fig. 36).
(10) Connect the ignition coil electrical connectors.
(11) Install upper intake manifold (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
MANIFOLD
-
INSTALLATION).
(12) Connect negative battery cable.
COVER CYLINDER HEAD -
RIGHT
REMOVAL
WARNING: DO NOT START OR RUN ENGINE WITH CYL-
INDER HEAD COVER REMOVED FROM THE ENGINE.
DAMAGE OR PERSONAL INJURY MAY OCCUR.
(1) Disconnect the negative battery cable.
(2) Remove the upper intake manifold from the
engine (Refer to 9 - ENGINE/MANIFOLDS/INTAKE
MANIFOLD - REMOVAL).
(3) Cover lower intake manifold with a suitable
cover during service.
(4) Disconnect and remove the three ignition coils
(Fig. 41).
(5) Lift up on the wire harness track retaining
tabs.
(6) Remove the ground strap retaining bolt from
the cylinder head cover.
(7) Completely loosen the cylinder head cover
retaining bolts and remove the cylinder head cover.
INSTALLATION
(1) Clean cylinder head and cover mating surfaces.
Inspect and replace gasket and seals as necessary
(Fig. 42).
Fig. 41 IGNITION COIL-RH
1 - ELECTRICAL CONNECTORS
2 - IGNITION COILS
Fig. 42 Cylinder Head Cover Gasket and Spark Plug
Tube Seals
1 - CYLINDER HEAD COVER GASKET
2 - SPARK PLUG TUBE SEALS
9 - 42
ENGINE 3.5L
CS
CYLINDER HEAD COVER - LEFT (Continued)
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