41646A10 Mercruiser BELL HOUSING ASSEMBLY, Use Without Trim Senders

Troubleshooting
Troubleshooting can be difficult. On the following pages 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 cannot give all possible problems and corrections. The serviceman must find the problem and its source, then make the necessary repairs.1. Sending Unit For Water Temperature Activates At Wrong Temperature.2. Contactor Switch For Oil Pressure Does Not Activate Shutoff Solenoid.3. Sending Unit For Torque Converter Temperature Activates At Wrong Temperature.4. Sending Unit For Oil Pressure Activates At Wrong Temperature.Troubleshooting Problems
Problem 1: Sending Unit For Water Temperature Activates At Wrong Temperature. Probable Cause:1. Wrong Setting Of Sending Unit Make a test of temperature setting and if necessary install new contactor switch with correct setting. See Specifications. Problem 2: 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 Problem 3: Sending Unit For Torque Converter Temperature At Wrong Temperature. Probable Cause:1. Wrong Setting Of Sending Unit Make a test of temperature setting and if necessary install new contactor switch with correct setting. See Specifications. Problem 4: Sending Unit For Oil Pressure Activates at wrong temperature. Probable Cause:1. Wrong Setting Of Sending Unit Make a test of temperature setting and if necessary install new contactor switch with correct setting. See Specifications.Instruments And Gauges
Oil Pressure Switch
Oil Pressure Switch
Terminal 1 is common. Terminal 2 is normally open. Terminal 3 is normally closed. For the pressure at which each circuit will be switched find the switch in specifications section of this manual.1. Connect the oil pressure switch to a pressure source that can be measured with accuracy.2. Connect a circuit tester between terminal (2) and terminal (1).3. With pressure increase, the circuit light will light.4. With pressure decrease, the circuit light will go out.5. Connect a circuit tester between terminal (3) and terminal (1).6. With pressure increase, the circuit light will go out.7. With pressure decrease, the circuit light will light.8. If the switch fails to operate at the correct pressures, replace the switch.Oil Pressure Sending Unit
Oil Pressure Sending Unit
(1) Connection. (2) Fitting.1. Connect the sending unit to a pressure source that can be measured with accuracy.2. Connect the 6V7070 Digital Multimeter between fitting (2) and terminal (1).3. Refer to Oil Pressure Sending Unit in Specifications. Take resistance readings at the pressure shown in the chart. 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
Heat Sink
[Dimensions in mm (inches)]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.
Water Temperature Sending Unit
(1) Connection. (2) Nut. (3) Bulb.2. Install the water temperature sending unit in the heat sink.
Switch Test (Typical Example)
(4) 2F7112 Thermometer. (5) Fabricated heat sink.3. Put heat sink (5) and water temperature sending unit in water as shown. Use blocks to support the heat sink at surface level.4. Connect the 6V7070 Digital Multimeter between terminal (1) and nut (2). Do not let the bulb (3) have contact with the pan.5. Put a 2F7112 Thermometer (4) in the water to measure the temperature.6. Stir the water while using a torch to heat the water. Refer to Water Temperature Sending Unit in Specifications. Take resistance readings at the temperatures shown in the chart.7. If a unit does not have the correct resistance readings, replace the unit.Torque Converter Temperature Sending Unit
Torque Converter Temperature Sending Unit
(1) Connection. (2) Nut. (3) Bulb.1. Connect the 6V7070 Digital Multimeter 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 Water Temperature Sending Unit for more detail).2. Put a 2F7112 Thermometer in the water to measure the temperature.3. Refer to Torque Converter Temperature Sending Unit in Specifications. Take resistance readings at the temperature shown in the chart.4. If a unit does not have the correct resistance readings, replace the unit.