Chrysler Pacifica. Manual — part 668
Gear Puller L-4407A
Front Crankshaft Seal Remover 6341A
Driver 6342
Crankshaft Seal Protector 6780-2
DIAL INDICATOR C-3339
Valve Spring Compressor C-3422-D
Spring Compressor Adapter 6526
Valve Spring Tester C-647
Valve Spring Compressor MD998772A
Valve Spring Adapter 6527
CS
ENGINE 3.5L
9 - 27
ENGINE 3.5L (Continued)
Indicator, Cylinder Bore C-119
Crankshaft Main Bearing Remover C-3059
Rear Crankshaft Oil Seal Installer 6926
Crankshaft Real Seal Retainer Alignment Fixture
8225
Release Probe 8351
Cylinder Compression Pressure Adaptor 8116
Driveline Support Table 8874
Driveline Support Fixture 8534B
9 - 28
ENGINE 3.5L
CS
ENGINE 3.5L (Continued)
ELEMENT-AIR CLEANER
REMOVAL
(1) Disconnect the intake air temperature sensor
(IAT) wiring harness connector.
(2) Disconnect the air inlet tube at the throttle
body.
(3) Remove the cover screws
(4) Lift cover and pull toward the engine and
remove cover tabs from air box.
(5) Lift cover and remove the element (Fig. 16).
INSTALLATION
(1) Install the air filter element into air box (Fig.
16).
(2) Move cover so that the tabs insert into the air
box.
(3) Seat cover onto element housing and tighten
the screws.
(4) Reconnect the air inlet tube and tighten clamp.
(5) Connect the intake air temperature sensor wire
harness connector
HOUSING-AIR CLEANER
REMOVAL
(1) Disconnect the intake air temperature (IAT)
sensor wiring harness connector.
(2) Remove the air inlet hose at the throttle body.
(3) Disconnect the air circulation hose at the ele-
ment housing.
(4) Remove the housing retaining bolt.
(5) Pull housing up and off of the locating pin.
(6) Remove element housing from vehicle.
INSTALLATION
(1) Install housing into vehicle and the locating
pin.
(2) Install housing retaining bolt.
(3) Connect the air inlet hose to the throttle body
and tighten clamp.
(4) Connect the air circulation hose to housing.
(5) Connect the intake air temperature (IAT) sen-
sor wiring harness connector.
CYLINDER HEAD(S)
DESCRIPTION
The aluminum alloy cylinder heads feature cross-
flow type intake and exhaust ports. Valve guides and
seat inserts are powdered metal. Valves are arranged
in a “V”, with each camshaft on center. To improve
combustion speed the chambers are a compact spher-
ical design with a squish area of approximately 30
percent of the piston top area. The cylinder heads are
common to either cylinder bank by reversing the
direction of installation.
DIAGNOSIS AND TESTING—CYLINDER HEAD
GASKET
A cylinder head gasket leak can be located between
adjacent cylinders or between a cylinder and the
adjacent water jacket.
Possible indications of the cylinder head gasket
leaking between adjacent cylinders are:
• Loss of engine power
• Engine misfiring
• Poor fuel economy
Possible indications of the cylinder head gasket
leaking between a cylinder and an adjacent water
jacket are:
• Engine overheating
• Loss of coolant
• Excessive steam (white smoke) emitting from
exhaust
• Coolant foaming
CYLINDER-TO-CYLINDER LEAKAGE TEST
To determine if an engine cylinder head gasket is
leaking between adjacent cylinders, follow the proce-
dures in Cylinder Compression Pressure Test (Refer
to 9 - ENGINE - DIAGNOSIS AND TESTING). An
engine cylinder head gasket leaking between adja-
Fig. 16 AIR CLEANER ELEMENT
1 - HOUSING COVER
2 - SCREWS
3 - ELEMENT HOUSING
CS
ENGINE 3.5L
9 - 29
cent cylinders will result in approximately a 50–70%
reduction in compression pressure.
CYLINDER-TO-WATER JACKET LEAKAGE TEST
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING WITH COOLANT PRES-
SURE CAP REMOVED.
VISUAL TEST METHOD
With the engine cool, remove the coolant pressure
cap. Start the engine and allow it to warm up until
thermostat opens.
If a large combustion/compression pressure leak
exists, bubbles will be visible in the coolant.
COOLING SYSTEM TESTER METHOD
WARNING: WITH COOLING SYSTEM TESTER IN
PLACE, PRESSURE WILL BUILD UP FAST. EXCES-
SIVE
PRESSURE
BUILT
UP,
BY
CONTINUOUS
ENGINE OPERATION, MUST BE RELEASED TO A
SAFE PRESSURE POINT. NEVER PERMIT PRES-
SURE TO EXCEED 138 kPa (20 psi).
Install Cooling System Tester 7700 or equivalent to
pressure cap neck. Start the engine and observe the
tester’s pressure gauge. If gauge pulsates with every
power stroke of a cylinder a combustion pressure
leak is evident.
CHEMICAL TEST METHOD
Combustion leaks into the cooling system can also
be checked by using Bloc-Chek Kit C-3685-A or
equivalent. Perform test following the procedures
supplied with the tool kit.
REMOVAL - CYLINDER HEAD(S)
RIGHT CYLINDER HEAD
(1) Perform the fuel relief procedure.
(2) Disconnect the negative battery cable.
(3) Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(4) Remove the engine cover.
(5) Remove air cleaner element housing (Refer to 9
- ENGINE/AIR INTAKE SYSTEM/AIR CLEANER
HOUSING - REMOVAL).
(6) Disconnect the fuel line at the fuel rail.
(7) Remove the upper intake manifold (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
MANIFOLD
-
REMOVAL).
(8) Remove the lower intake manifold (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
MANIFOLD
-
REMOVAL).
(9) Raise the vehicle.
(10) Remove right front tire.
(11) Remove right inner splash shield.
(12) Remove accessory drive belt (Fig. 18).
(13) Remove
vibration
damper
(Refer
to
9
-
ENGINE/ENGINE BLOCK/VIBRATION DAMPER -
REMOVAL) (Fig. 17).
(14) Remove lower accessory drive belt idler pulley
(Fig. 18).
(15) Remove the power steering mounting bolts
and set the pump aside (Refer to 19 - STEERING/
PUMP - REMOVAL).
(16) Remove lower outer timing belt cover bolts
(Fig. 17).
(17) Raise the vehicle.
(18) Remove catalytic converter mounting nuts
(Refer to 11 - EXHAUST SYSTEM/CATALYTIC
CONVERTER - REMOVAL).
(19) Disconnect both oxygen sensor harness con-
nectors.
(20) Separate the muffler to tail pipe union (Refer
to
11
-
EXHAUST
SYSTEM/MUFFLER
-
REMOVAL).
(21) Remove catalytic converter (Refer to 11 -
EXHAUST SYSTEM/CATALYTIC CONVERTER -
REMOVAL).
(22) Remove the exhaust cross over pipe lower
bolts (Refer to 11 - EXHAUST SYSTEM/CROSS-
OVER PIPE - REMOVAL).
Fig. 17 FRONT TIMING BELT COVER
1 - FRONT TIMING BELT COVER
2 - ENGINE OIL FILTER
3 - VIBRATION DAMPER
4 - TIMING BELT TENSIONER
9 - 30
ENGINE 3.5L
CS
CYLINDER HEAD(S) (Continued)
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