Troubleshooting

Troubleshooting can be difficult. On the following pages there is a list of possible problems. To make a repair to a problem, make reference to the cause and correction.

This list of problems, causes and corrections, will only give an indication of where a possible problem can be, and what repairs are needed. Normally, more or other repair work is needed beyond the recommendation in the list.

Remember that a problem is not normally caused only by one part, but by the relation of one part with other parts. This list can not give all possible problems and corrections. The serviceman must find the problem and its source, then make the necessary repairs.

Troubleshooting Problem List

1. Contactor Switch For Water Temperature Does Not Activate Shutoff Solenoid.

2. Contactor Switch For Water Temperature Activates At Wrong Temperature.

3. Contactor Switch For Oil Pressure Does Not Activate Shutoff Solenoid.

4. Electrical Gauges Give Wrong Readings.

For information on the 2301 Electric Governor refer to 2301 Electric Governor Service Manual, Form No. SENR2928.

Troubleshooting Problems

Problem 1: Contactor Switch For Water Temperature Does Not Activate Shutoff Solenoid.

Probable Cause:

1. Wrong Connections

Check connections, wiring and correct where necessary.

2. Failure Of Shutoff Solenoid

Check the shutoff solenoid.

3. Low Water Level In Cooling System

Fill the cooling system.

4. Wrong Setting Of Switch

Make a test of temperature setting and if necessary install new contactor switch with correct setting. See specifications.

Problem 2: Contactor Switch For Water Temperature Activates At Wrong Temperature.

Probable Cause:

1. Wrong Setting Of Switch

Make a test of temperature setting and if necessary install new contactor switch with correct setting. See specifications.

Problem 3: Contactor Switch For Oil Pressure Does Not Activate Shutoff Solenoid.

Probable Cause:

1. Wrong Connections

Check connections, wiring and correct where necessary.

2. Wrong Setting Of Switch

Make a test of temperature setting and if necessary install new contactor switch with correct setting. See specifications.

Problem 4: Electrical Gauges Give Wrong Readings.

Probable Cause:

1. Wrong Connections

Check connections, wiring and correct where necessary.

2. Sending Units Have A Failure

Check the sending units and install new ones if necessary.

3. Wrong Sending Unit In System

Install correct sending unit.

4. Wrong Gauge

Install correct gauge.

Governor Control Group

Governor Control Group
(1) Bracket. (2) Cylinder head. (3) Inlet manifold. (4) Control assembly.

Mount bracket (1) at the fourth and fifth bolt location from the rear of inlet manifold (3) on 3116 Engines. Mount bracket (1) at the second and third bolt location from the rear of inlet manifold (3) on 3114 Engines.

Instruments And Gauges

Contactor Switch For Water Temperature

1. Make a heat sink as shown. Material can be brass, steel or cast iron. Drill a 23/32 in. hole through the plate and use a tap to make 1/2 in. NPT threads.

Heat Sink [Dimensions in mm (inches)]

2. Put marks on the two contactor wires that connect the contactor to the circuit. Disconnect the two wires.

3. Remove the contactor and install a 3J5389 Plug. Install the contactor switch in the heat sink.

4. Put the heat sink and contactor in water as shown. Use blocks to support the heat sink at surface level.

5. Connect 8T500 Circuit Tester between the wires that connected the contactor to the circuit.

Test Of Contactor Switch
(1) 2F7112 Thermometer. (2) Fabricated heat sink.

6. Put the 2F7112 Thermometer in the water.

7. Stir the water while using a torch to heat it to the temperature range at which the contactor must activate. If the circuit test light does not come on within the temperature range given in the specifications, make a replacement of the contactor.

8. Let the water temperature go down. If the circuit light does not go out within the temperature range given in the specifications, make a replacement of the contactor.

Oil Pressure Sending Unit

Sending Unit for Oil Pressure
(1) Connection. (2) Fitting.

1. Connect the sending unit to a pressure source that can be measured with accuracy.

2. Connect an ohmmeter between fitting (2) and terminal (1).

3. Refer to Oil Pressure Sending Unit in the Specifications section. Take resistance readings at the pressure shown in the chart.

NOTE: Tap sender when checking calibration. Take readings on decreasing pressure.

4. If a unit does not have the correct resistance readings, replace the unit.

Water Temperature Sending Unit

1. Connect an ohmmeter between terminal (1) and nut (2). Put bulb (3) in heat sink then into a pan of water. Do not let the bulb have contact with the pan(see contactor switch for more detail).

2. Put a 2F7112 Thermometer in the water to measure the temperature.

Sending unit for Water Temperature
(1) Connection. (2) Nut. (3) Bulb.

3. Refer to Water Temperature Sending Unit in the Specifications section. Take resistance readings at the temperature shown in the chart.

4. If a unit does not have the correct resistance readings, replace the unit.

Electric Gauges

1. Put the gauge in position with the letters horizontal and the face 30° back from vertical.

Wiring Diagram For Test
(1) Terminal (for test voltage). (2) Test Resistance.

2. Connect the gauge in series with the power source and the middle test resistance shown in the chart.

3. Let the gauge heat at the middle resistance for 5 minutes, then check the pointer position for all of the resistances given.

NOTE: Refer to the gauge area in the Specifications section for the Calibration Chart of each gauge.

Magnetic Pickup

Typical Illustration

(1) Clearance between magnetic pickup and flywheel ring gear ... 0.55 to 0.83 mm (.022 to .033 in)

NOTE: With the engine stopped, turn the pickup in until it comes in contact with the teeth on the flywheel ring gear. Turn the pickup out 1/2 turn. This will give 0.55 to 0.83 mm (.022 to .033 in) clearance at (1).

(2) Tighten the locknut to a torque of ... 45 ± 7 N·m (33 ± 5 lb ft)