Dodge Dakota Sport 2001 Service Manual page 1111

9 - 82 ENGINE 3.9L
ENGINE 3.9L (Continued)
Pressure Tester Kit 7700
Bloc–Chek–Kit C-3685–A
AIR CLEANER ELEMENT
REMOVAL
Housing removal is not necessary for element (fil-
ter) replacement.
(1) Pry up spring clips from housing cover (spring
clips retain cover to housing).
(2) Release housing cover from locating tabs on
housing (Fig. 6) and remove cover.
(3) Remove air cleaner element (filter) from hous-
ing.
(4) Clean inside of housing before replacing ele-
ment.
Fig. 6 Air Cleaner Housing Assembly
1 - AIR CLEANER ELEMENT COVER
2 - TABS
3 - HOUSING
INSTALLATION
(1) Install element into housing.
(2) Position housing cover into housing locating
tabs.
(3) Pry up spring clips and lock cover to housing.
CYLINDER HEAD
DESCRIPTION
The cast iron cylinder heads (Fig. 7) are mounted
to the cylinder block using eight bolts. The spark
plugs are located in the peak of the wedge between
the valves.
Fig. 7 Cylinder Head Assembly—3.9L Engine
1 - SPARK PLUGS
2 - SPARK PLUG
3 - INTAKE VALVE
4 - EXHAUST VALVES
5 - INTAKE VALVES
6 - EXHAUST VALVE
OPERATION
The cylinder head closes the combustion chamber
allowing the pistons to compress the air fuel mixture
to the correct ratio for ignition. The valves located in
the cylinder head open and close to either allow clean
air into the combustion chamber or to allow the
exhaust gases out, depending on the stroke of the
engine.
DIAGNOSIS AND TESTING—CYLINDER HEAD
GASKET FAILURE
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
AN