Dodge Caliber. Manual — part 1099
5. Install fresh air inlet (2) on air cleaner housing (1)
and lock retainers (5).
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ENGINE 2.4L WORLD
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HOUSING-AIR CLEANER
REMOVAL
1. Remove fresh air inlet (2) from air cleaner housing
(1).
2. Remove intake air temperature sensor electrical
connector (4).
3. Remove air inlet tube (5) from housing (1).
4. Pull housing (1) upward to remove.
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INSTALLATION
1. Make sure the rubber grommets, for the air cleaner
housing lower pins, are in place when reinstalling
the air cleaner housing. The rubber grommets
mount to the PDC bracket.
2. Push air cleaner housing (1) down while aligning
pins into the grommets.
3. Connect the throttle body air inlet hose (5) to the
air cleaner housing (1).
4. Connect intake air temperature sensor connector
(4).
5. Install fresh air inlet (2) and lock retainers (5).
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CYLINDER HEAD
DESCRIPTION
The cross flow designed, aluminum cylinder head contains dual over-head camshafts with four valves per cylinder.
The valves are arranged in two in-line banks. The intake valves face toward the front of the vehicle. The exhaust
valves face the dash panel. The cylinder head incorporates powdered metal valve guides and seats. The cylinder
head is sealed to the block using a multi-layer steel head gasket and retaining bolts.
Integral oil galleries provide lubrication passages to the variable camshaft timing phasers, camshafts, and valve
mechanisms.
NOTE: Replacement cylinder heads will come complete with valves, seals, springs, retainers, keepers, lash
buckets, and camshafts.
DIAGNOSIS AND TESTING
CYLINDER HEAD GASKET
A cylinder head gasket leak can be located between adjacent cylinders, between a cylinder and the adjacent water
jacket or from an oil passage to the exterior of the engine.
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 procedures in Cyl-
inder Compression Pressure Test (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). An engine cylinder head
gasket leaking between adjacent 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 PRESSURE 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. EXCESSIVE
PRESSURE BUILT UP, BY CONTINUOUS ENGINE OPERATION, MUST BE RELEASED TO A SAFE PRESSURE
POINT. NEVER PERMIT PRESSURE 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.
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