Dodge Nitro. Manual — part 51

16. Install the skid plate (if equipped).

17. Install the front wheel and tire assemblies.

18. Lower the vehicle.

19. Refill engine oil.

20. Reconnect battery.

21. Start engine, and check for leaks.

INSTALLATION OIL PAN - 4X2

Fig. 145: Oil Pan Bolt Torque Sequence - 3.7L
Courtesy of CHRYSLER LLC

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

1. Clean the oil pan gasket mating surface of the bedplate and oil pan.

2. Clean the oil pan and block gasket mating surfaces.

3. Inspect integrated oil pan gasket, and replace as necessary.

4. Drop the oil pump pick-up tube into the oil pan, and install the oil pan, pick-up tube, and the windage

tray, as an assembly, from the front of the vehicle.

5. Install the windage tray, then the oil pump pick-up tube, and the (2) nuts and (1) bolt holding the oil pump

pick-up tube, in place.

6. Tighten the pick-up tube fasteners.

7. Install the oil pan.

8. Install and tighten the oil pan bolts. See Fig. 145.

9. Install the engine to transmission structural cover, (if equipped).

10. Lower engine, and remove Engine Support 8534.

11. Lower the vehicle.

12. Lower the engine using Engine Support Fixture 8534.

13. Remove the Engine Support Fixture 8534.

14. Raise the vehicle.

15. Tighten both engine mount through bolts.

16. Install the transmission oil cooler line bracket.

17. Lower the vehicle.

18. Refill engine oil.

19. Reconnect battery.

20. Start engine and check for leaks.

SWITCH-OIL PRESSURE

DESCRIPTION

OIL PRESSURE SENSOR

The oil pressure switch is a pressure sensitive switch that is activated by the engine's oil pressure (in the main
oil gallery). The switch is a two terminal device (one terminal is provided to the wiring harness and the other
terminal is the switch's metal housing that screws into the engine block).

OPERATION

OIL PRESSURE SWITCH

The oil pressure switch is normally "Closed." The switch changes from a "Closed" circuit to an "Open" circuit,

NOTE:

It will be necessary to move the oil pan from side to side to gain access to
these fasteners.

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

on increasing pressure of 7 psi. The oil pressure switch changes from an "Open" circuit to a "Closed" circuit, on
decreasing pressure, between 2 psi and 4 psi.

REMOVAL

OIL PRESSURE SWITCH

Fig. 146: Locating Oil Pressure Sending Unit, Connector & Oil Filter
Courtesy of CHRYSLER LLC

1 - BELT
2 - OIL PRESSURE SENSOR
3 - OIL FILTER

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro

1. Disconnect the negative cable from the battery.

2. Raise vehicle on hoist.

3. Remove front splash shield.

4. Disconnect oil pressure sender wire (4).

5. Remove the pressure sender. See Fig. 146 (2).

INSTALLATION

OIL PRESSURE SWITCH

1. Install oil pressure sender.

2. Connect oil pressure sender wire.

3. Install front splash shield.

4. Lower vehicle.

5. Connect the negative battery cable.

PUMP-ENGINE OIL

REMOVAL

OIL PUMP

1. Remove the oil pan and pick-up tube. See REMOVAL.

2. Remove the timing chain cover. See REMOVAL).

3. Remove the timing chains and tensioners. See REMOVAL.

4. Remove the four bolts, primary timing chain tensioner and the oil pump.

DISASSEMBLY

OIL PUMP

1. Remove oil pump cover screws and lift off cover plate.

2. Remove pump inner and outer rotors.

3. If it is necessary to remove the pressure relief valve, drive the roll pin from pump housing and remove

cup plug, spring and valve.

INSPECTION

4 - ELEC. CONNECTOR

NOTE:

Once the oil pressure relief valve, cup plug, and pin are removed, the
pump assembly must be replaced.

2007 Dodge Nitro R/T

2007 ENGINE 3.7L - Service Information - Nitro