Dodge Nitro. Manual — part 52

OIL PUMP

Fig. 147: Checking Oil Pump Cover Flatness
Courtesy of CHRYSLER LLC

1. Clean all parts thoroughly. Mating surface of the oil pump housing should be smooth. If the pump cover

is scratched or grooved the oil pump assembly should be replaced.

2. Lay a straight edge across the pump cover surface (3). If a 0.025 mm (0.001 in.) feeler gauge (2) can be

inserted between the cover and the straight edge the oil pump assembly should be replaced.

1 - STRAIGHT EDGE
2 - FEELER GAUGE
3 - OIL PUMP COVER

CAUTION: Oil pump pressure relief valve and spring should not be removed from the

oil pump. If these components are disassembled and or removed from the
pump the entire oil pump assembly must be replaced.

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

Fig. 148: Measuring Outer Rotor Thickness
Courtesy of CHRYSLER LLC

3. Measure the thickness of the outer rotor. If the outer rotor thickness measures at 12.005 mm (0.472 in.) or

less the oil pump assembly must be replaced.

4. Measure the diameter of the outer rotor. If the outer rotor diameter measures at 85.925 mm (3.382 in.) or

less the oil pump assembly must be replaced.

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

Fig. 149: Measuring Inner Rotor Thickness
Courtesy of CHRYSLER LLC

5. Measure the thickness of the inner rotor. If the inner rotor thickness measures at 12.005 mm (0.472 in.) or

less then the oil pump assembly must be replaced.

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

Fig. 150: Measuring Outer Rotor Clearance
Courtesy of CHRYSLER LLC

6. Slide outer rotor (2) into the body of the oil pump. Press the outer rotor to one side of the oil pump body

and measure clearance between the outer rotor and the body. If the measurement is 0.235mm (0.009 in.)
or more the oil pump assembly must be replaced.

1 -
FEELER
GAUGE
2 -
OUTER
ROTOR

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro