Mercury 200 OptiMax Jet Drive Service Manual page 108

4. The sensor can be tested with an ohmmeter by heating or cooling the end of the sensor at a controlled temperature. If the
readings do not match those in the table, replace the sensor and retest.
Centigrade
Fahrenheit
Ohms
5. If the ohm check of the cylinder head coolant temperature sensor indicates that the sensor is serviceable, perform an ohm
check of the sensor wiring between the sensor connector and the PCM.
6. If the wiring is serviceable, replace the PCM and recheck the sensor function using the CDS.
Cylinder Head Coolant Temperature Sensor Removal
1. Disconnect the engine harness connector from the sensor harness connector.
2. Remove the two screws securing the thermostat covers to the cylinder head.
3. Remove the cover and O‑ring.
4. Remove the sensor from the cylinder block.
Cylinder Head Coolant Temperature Sensor Installation
1. Inspect the sensor O‑ring for cuts or abrasions. Replace the O‑ring as required.
2. Apply Loctite 567 PST Pipe Sealant to the threads of the sensor.
Tube Ref No.
Loctite 567 PST Pipe
9
Sealant
3. Install the sensor with the O‑ring into the cylinder block. Tighten the sensor to the specified torque.
4. Connect the engine harness connector to the sensor.
5. Install the cover and O‑ring onto the cylinder head. Tighten the screws to the specified torque.
a
c
a - Port temperature sensor
b - Starboard temperature sensor
c - Cover
d - Screw (M6 x 25) (2)
e - Cylinder head
Description
Temperature sensor
Cover screws
90-8M0050731 MAY 2011
Cylinder Head Coolant Temperature Sensor Ohm Test
‑10 °C 20 °C
14 °F
55.3 kΩ ± 10% 12.5 kΩ ± 10%
Description
b
40 °C
68 °F 104 °F
5.3 kΩ ± 10%
Where Used
Cylinder head coolant temperature sensor threads
c
a
b
65 °C 95 °C
150 °F 203 °F
2.08 kΩ ± 10% 787 Ω ± 10%
Part No.
92-809822
e
c
d
45745
Nm lb‑in.
15 133
13.5 120
Page 2A-27
Ignition
lb‑ft