Dodge Nitro. Manual — part 84

Fig. 73: Air Cleaner Cover, Element & CCV Hose
Courtesy of CHRYSLER LLC

1. Install the air filter element (2) into air box. See Fig. 73.

2. Position the cover (1) so that the rear locking tabs insert into the lower housing.

3. Seat cover (1) onto element housing and assure that the front locking tabs engage.

4. Reconnect the CCV hose (3).

HOUSING-AIR CLEANER

REMOVAL

1 - AIR CLEANER COVER
2 - ELEMENT
3 - CCV HOSE

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

REMOVAL

Fig. 74: Air Cleaner Housing Assembly
Courtesy of CHRYSLER LLC

1. Separate the air inlet duct (5) at the element housing (6).

2. Disconnect the CCV hose (2) at the element housing (6).

1 - BOLT
2 - CCV HOSE
3 - THROTTLE
4 - IAT SENSOR
5 - INLET AIR DUCT
6 - AIR CLEANER ELEMENT HOUSING

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

3. Remove the housing retaining bolt (1).

4. Pull housing up and off of the locating pin.

5. Remove element housing (6) from vehicle. See Fig. 74

INSTALLATION

INSTALLATION

Fig. 75: Air Cleaner Housing Assembly
Courtesy of CHRYSLER LLC

1 - BOLT
2 - CCV HOSE
3 - THROTTLE

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

1. Align the housing (6) with the lower air inlet duct and alignment grommet in the wheel housing.

2. Properly fit the housing (6) and install housing retaining bolt (1). See Fig. 75.

3. Connect the inlet air duct (5) to the housing (6) and tighten clamp.

4. Connect the CCV hose (2) to housing.

CYLINDER HEAD(S)

DESCRIPTION

CYLINDER HEAD

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 spherical 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 procedures in

4 - IAT SENSOR
5 - INLET AIR DUCT
6 - AIR CLEANER ELEMENT HOUSING

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro