Dodge Journey: Description, Diagnosis and Testing
DESCRIPTION
Fig. 91: Cylinder Head, Valves & Springs
- - VALVE KEEPER
- - SPRING RETAINER
- - VALVE KEEPER
- - VALVE SPRING-EXHAUST
- - SPRING RETAINER
- - VALVE STEM SEAL
- - VALVE-EXHAUST
- - VALVE-INTAKE
- - CYLINDER HEAD
- - VALVE STEM SEAL
- - VALVE SPRING-INTAKE
The cylinder heads are made of an aluminum alloy. The cylinder head features four valves (8) per cylinder with pressed in powdered metal valve guides. The cylinder heads provide enclosures for the timing chain drive, necessitating a unique right and left cylinder head.
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 procedures in Cylinder Compression Pressure Test. 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.
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.
Cylinder head
...Standard procedure
CYLINDER HEAD OIL GALLERY CUP PLUG SERVICE Fig. 92: Oil Gallery Cup Plug - CUP PLUG BORE CHAMFER - ORIGINAL CUP PLUG - NEW CUP PLUG - 1-2 mm NOTE: DETERMINE WHICH CUP PLUG IS LEAKIN ...See also:
Description, Operation
DESCRIPTION
OPERATION
The following procedure has been established to assist technicians in the
field with enabling and running OBD
II Monitors. The order listed in the following procedur ...
Plug, glow
DESCRIPTION
Fig. 26: Glow Plug
Glow plugs are used to help start a cold or cool engine. The glow plugs will
heat up and glow to heat the
combustion chamber of each cylinder. An individual glow ...
Removal
BATTERY HARNESS
WARNING: To protect the hands from battery acid, a suitable pair
of heavy duty
rubber gloves should be worn when removing or servicing a battery.
Safety glasses als ...