Dodge Nitro. Manual — part 53

Fig. 151: Measuring Clearance Between Rotors
Courtesy of CHRYSLER LLC

7. Install the inner rotor into the oil pump body. Measure the clearance between the inner (3) and outer (1)

rotors. If the clearance between the rotors is .150 mm (0.006 in.) or more the oil pump assembly must be
replaced.

1 -
OUTER
ROTOR
2 -
FEELER
GAUGE
3 -
INNER
ROTOR

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

Fig. 152: Measuring Flatness Of Rotors
Courtesy of CHRYSLER LLC

8. Place a straight edge (1) across the body of the oil pump (between the bolt holes), if a feeler gauge (2)

of.095 mm (0.0038 in.) or greater can be inserted between the straightedge and the rotors, the pump must
be replaced.

ASSEMBLY

OIL PUMP

1 -
STRAIGHT
EDGE
2 -
FEELER
GAUGE

NOTE:

The 3.7L/4.7L Oil pump is released as an assembly. There are no
DaimlerChrysler part numbers for Sub-Assembly components. In the event the
oil pump is not functioning or out of specification it must be replaced as an
assembly.

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

1. Wash all parts in a suitable solvent and inspect carefully for damage or wear.

2. Install inner and outer rotors

3. Install oil pump cover plate and install cover bolts and tighten them to 12 N.m (105 in. lbs.).

4. Prime oil pump before installation by filling rotor cavity with engine oil.

5. If oil pressure is low and pump is within specifications, inspect for worn engine bearings or other causes

for oil pressure loss.

INSTALLATION

OIL PUMP

Fig. 153: Primary Timing Chain Tensioner Bolt Tightening Sequence
Courtesy of CHRYSLER LLC

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

1. Position the oil pump onto the crankshaft and install two oil pump retaining bolts.

2. Position the primary timing chain tensioner and install the two retaining bolts.

3. Tighten the oil pump and primary timing chain tensioner retaining bolts to 28 N.m (250 in. lbs.) in the

sequence shown. See Fig. 153.

4. Install the secondary timing chain tensioners and timing chains. See INSTALLATION.

5. Install the timing chain cover. See INSTALLATION).

6. Install the pick-up tube and oil pan. See INSTALLATION.

MANIFOLDS

MANIFOLD-INTAKE

DESCRIPTION

INTAKE MANIFOLD

Fig. 154: 3.7L Intake Torque Sequence
Courtesy of CHRYSLER LLC

The intake manifold is made of a composite material and features 300 mm (11.811 in.) long runners which
maximizes low end torque. See Fig. 154.

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro