Ford Oil Pressure Indicator Lamp Sending Unit Replace With Diagrams

Ford F-350 Oil Pressure Indicator Lamp Sending Unit

REMOVAL & INSTALLATION

See Figures 1, 2 and 3

Fig. Fig. 1: Oil pressure switch location-4.9L engine

Fig. Fig. 2: Oil pressure switch location-5.0L/5.8L engines

Fig. Fig. 3: Oil pressure switch-7.3L diesel and 7.5L gasoline engines (adapter is for 7.3L only)

1. Unscrew the unit.
2. Coat the threads with electrically conductive sealer and screw the unit into place. The torque should be 10-18 ft. lbs. (14-24 Nm).

For the location of your unit, see the accompanying illustrations.

3. Disconnect the wiring at the unit.

OPERATION

A single terminal oil pressure switch is used on vehicles equipped with an oil pressure lamp.

If the pressure is detected to be at an unsafe level, a red indicator lamp will glow on the dashboard. The light should come on when the engine is off but the ignition is in the RUN position. Once the engine is started, the light should go out.

The lamp is connected between the oil pressure switch unit (mounted on the engine and the coil terminal of the ignition switch.

TESTING

1. Turn the ignition to the RUN position with the engine not running. The indicator lamp should come on.
2. If the indicator lamp does not come on, disconnect the wire from the oil pressure switch terminal and ground the wire.
3. If the indicator light comes on, the pressure switch is inoperative. Replace the switch.
4. If the indicator light fails to come on, either the bulb is burned out, there is no power to the bulb, or the circuit is open somewhere between the bulb and the oil pressure switch.
5. If the lamp stays on with the engine running and the engine has adequate oil pressure, disconnect the wire to the switch. If the lamp goes out, replace the oil pressure switch. If the lamp does not go out, correct the short in the wiring between the switch and lamp.

REMOVAL & INSTALLATION

See Figures 4 and 5

Fig. Fig. 4: Common oil pressure switch locations

Fig. Fig. 5: Common oil pressure switch location

WARNING

The pressure switch used with the oil pressure warning light is not interchangeable with the sending unit used with the oil pressure gauge. If the incorrect part is installed the oil pressure indicating system will be inoperative and the sending unit or gauge will be damaged.

1. Unplug the connector at the unit and unscrew it from its mounting.
2. To install the unit, apply pipe sealant or Teflon® tape to the threads of the new switch and screw it in to its mount. Tighten it to 8-18 ft. lbs. (11-24 Nm).
3. Connect the wiring to the unit.
4. Run the engine and check for leaks and proper operation.

Ford Oil Pressure Gauge Sending Unit Replace

Oil Pressure Gauge Sending Unit 

OPERATION

The oil pressure sending unit is a variable resistance type magnetic unit that works in conjunction with the magnetic operation of the gauge system.

The sensing unit may only be tested for operation. There is no calibration, adjustment or maintenance required.

TESTING

1. With the key in the RUN position and the engine off, unplug the wiring at the switch. The gauge should read on the LOW graduation or below.
2. Attach the wiring connector to the engine block (ground). The gauge should read just slightly above mid-scale.
3. If the oil pressure gauge tests within specification, replace the oil pressure switch.
4. If the gauge still tests out of calibration, replace the oil pressure gauge.

REMOVAL & INSTALLATION

WARNING

The pressure switch used with the oil pressure warning light is not interchangeable with the sending unit used with the oil pressure gauge. If the incorrect part is installed the oil pressure indicating system will be inoperative and the sending unit or gauge will be damaged.

1. Unplug the connector at the unit and unscrew it from its mounting.
2. To install the unit, apply pipe sealant or Teflon® tape to the threads of the new switch and screw it in to its mount. Tighten it to 8-18 ft. lbs. (11-24 Nm).
3. Connect the wiring to the unit.
4. Run the engine and check for leaks and proper operation.

Ford Coolant Temperature Sensor Replace With Diagrams

Ford F-350 Coolant Temperature Sensor

OPERATION

When coolant temperature is low, the resistance of the sending unit is high, restricting the flow of current through the gauge and moving the pointer only a short distance. As coolant temperature rises, the resistance of the sending unit decreases, causing a proportional increase in current flow through the sending unit and corresponding movement of the gauge pointer.

The sending unit may only be tested for operation. There is no calibration, adjustment or maintenance required.

TESTING

See Figures 1, 2, 3 and 4

Fig. Fig. 1: Coolant temperature sender location-4.9L engine

Fig. Fig. 2: Coolant temperature sending unit-5.0L/5.8L engine shown, 7.5L engine similar

Fig. Fig. 3: Submerge the end of the coolant temperature sensor in cold or hot water and check the resistance

Fig. Fig. 4: Coolant temperature sensor temperature vs. resistance values

1. Remove the sensor from the vehicle.
2. Immerse the tip of the sensor in container of water.
3. Connect a digital ohmmeter to the two terminals of the sensor.
4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
6. If the sensor does not meet specification, it must be replaced.

REMOVAL & INSTALLATION

For the location of your unit, see the accompanying illustrations.

1. Disconnect the negative battery cable.
2. Drain the cooling system into a suitable container.

CAUTION

When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

3. Disengage the electrical connector at the temperature sender/switch.
4. Remove the temperature sender/switch.

To install:

5. Apply pipe sealant or Teflon® tape to the threads of the new sender/switch.
6. Install the temperature sender/switch and connect the electrical connector.
7. Connect the negative battery cable. Fill the cooling system.
8. Run the engine and check for leaks.