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