Dodge Nitro. Manual — part 613

1. Position diesel particulate filter assembly in vehicle.

2. Install DPF to exhaust manifold bolts. Do not tighten at this time.

3. Install muffler/tailpipe to DPF flange nuts. Tighten nut to 32 N.m. (24 ft. lbs.).

4. Tighten DPF to exhaust manifold bolts to 32 N.m (24 ft. lbs.) Tighten muffler/tailpipe to DPF flange nuts

to 34 N.m (24 ft. lbs.).

5. Lower vehicle.

6. Using scan tool, under ENGINE MISC. FUNCTIONS, perform DIESEL PARTICULATE FILTER

REPLACEMENT function.

TURBOCHARGER

DIAGNOSIS AND TESTING

TURBOCHARGER-BOOST PRESSURE

Low turbocharger boost pressure can cause poor engine performance and driveability concerns. The following
procedure will test the turbocharger boost pressure.

Causes of low boost pressure include the following:

Restricted air inlet system

Leak in charge air cooler system

Restricted/high pressure drop across charge air cooler

Damaged turbocharger compressor wheel housing

Turbocharger wastegate stuck open

Excessive exhaust restriction

Causes of excessively high boost pressure include:

Turbocharger wastegate stuck closed

Turbocharger wastegate signal line leaking or damaged

Damaged wastegate command valve O-rings

Wastegate command valve mechanically stuck in actuated position

Several Diagnostic Trouble Codes (DTCs) can be set that will indicate high or low system boost levels. There is
a DTC for circuit faults relating to the electronically controlled wastegate command valve.

See DIAGNOSIS AND TESTING for diagnosing of low or high boost pressure due to leaks.

6 - ISOLATOR
7 - MUFFLER/TAIL PIPE ASSEMBLY
8 - DPF TO MUFFLER FLANGE

2007 Dodge Nitro R/T

2007 ENGINE Exhaust System And Turbocharger - Nitro

TURBOCHARGER

DESCRIPTION

TURBOCHARGER-DESCRIPTION

Fig. 15: Identifying Turbocharger Components
Courtesy of CHRYSLER LLC

1 - TURBINE SECTION
2 - EXHAUST GAS
3 - BEARING HOUSING
4 - COMPRESSOR SECTION
5 - INLET AIR
6 - COMPRESSED AIR TO ENGINE
7 - EXHAUST GAS
8 - EXHAUST GAS TO EXHAUST PIPE

2007 Dodge Nitro R/T

2007 ENGINE Exhaust System And Turbocharger - Nitro

The turbocharger is an exhaust-driven supercharger which increases the pressure and density of the air entering
the engine through the charge air cooler. With the increase of air entering the engine, more fuel can be injected
into the cylinders, which creates more power during combustion.

The turbocharger assembly consists of four (5) major component systems. See Fig. 15

Turbine section

Compressor section

Bearing housing

Variable veins

Actuator

OPERATION

OPERATION

CAUTION: The turbocharger is a performance part and must not be tampered with.

The wastegate bracket is an integral part of the turbocharger. Tampering
with the wastegate components can reduce durability by increasing
cylinder pressure and thermal loading due to incorrect inlet and exhaust
manifold pressure. Poor fuel economy and failure to meet regulatory
emissions laws may result. Increasing the turbocharger boost WILL NOT
increase engine power.

2007 Dodge Nitro R/T

2007 ENGINE Exhaust System And Turbocharger - Nitro

Fig. 16: Turbocharger Oil Supply & Drain
Courtesy of CHRYSLER LLC

Exhaust gas pressure and energy drive the turbine, which in turn drives a centrifugal compressor that
compresses the inlet air, and forces the air into the engine through the charge air cooler and plumbing. Since
heat is a by-product of this compression, the air must pass through a charge air cooler to cool the incoming air
and maintain power and efficiency.

Increasing air flow to the engine provides:

Improved engine performance

1 - BEARINGS
2 - OIL SUPPLY (FROM ENGINE BLOCK)
3 - OIL RETURN (TO OIL PAN)

2007 Dodge Nitro R/T

2007 ENGINE Exhaust System And Turbocharger - Nitro