Dodge Nitro. Manual — part 133

6. Remove the oil pump fasteners. Remove the oil pump and gasket from engine. See Fig. 260.

DISASSEMBLY

PUMP-OIL

Fig. 261: Oil Pump Body, Oil Pump Outer Rotor, Screws, Oil Pump Cover & Oil Pump Inner Rotor
Courtesy of CHRYSLER LLC

1 - OIL PUMP BODY
2 - OIL PUMP OUTER ROTOR
3 - SCREWS
4 - OIL PUMP COVER
5 - OIL PUMP INNER ROTOR

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

1. Remove oil pump cover screws (3) and lift off cover (4). See Fig. 261.

2. Remove pump rotors (2, 5).

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

CLEANING

PUMP-OIL

1. Clean all parts thoroughly in a suitable solvent.

INSPECTION

PUMP-OIL

Fig. 262: Checking Oil Pump Cover Flatness
Courtesy of CHRYSLER LLC

NOTE:

DO NOT inspect the oil relief valve assembly. If the oil relief valve is suspect,
replace the oil pump.

1 - STRAIGHT EDGE

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

1. Disassemble oil pump. See DISASSEMBLY.

2. Clean all parts thoroughly. Mating surface of the oil pump housing should be smooth. Replace pump

cover if scratched or grooved.

3. Lay a straightedge (1) across the pump cover (3) surface. If a 0.025 mm (0.001 in.) feeler gauge can be

inserted between cover and straight edge, cover should be replaced. See Fig. 262.

Fig. 263: Measuring Thickness And Diameter Of Outer Rotor
Courtesy of CHRYSLER LLC

4. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 14.299 mm (0.563 in.) or

less , or if the diameter is 79.78 mm (3.141 inches.) or less, replace outer rotor. See Fig. 263.

2 - FEELER GAUGE
3 - OIL PUMP COVER

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro

Fig. 264: Measuring Inner Rotor Thickness
Courtesy of CHRYSLER LLC

5. If inner rotor measures 14.299 mm (0.563 in.) or less replace inner rotor. See Fig. 264.

2007 Dodge Nitro R/T

2007 ENGINE 4.0L - Service Information - Nitro