Mercury MerCruiser MCM 454 Mag MPI Service Manual page 409

INSTRUMENTATION
4. Heat sand and observe thermometer.
5. As temperature rises, switch will close and ohmmeter will indicate continuity. Refer to
chart below for specifications.
Switch Condition
Opens
Closes
6. Turn heat source off. Allow sand to cool. Note thermometer reading to ensure switch
opens up at specified temperature.
7. Replace switch if switch fails to either open or close within the specified temperature.
INSTALLATION
1. Apply Loctite Pipe Sealant with Teflon to threads of transmission fluid temperature
switch.
2. Install switch with sealing washer in transmission and tighten securely.
3. Reconnect harness wires and coat with Liquid Neoprene.
Typical Location
4. Check transmission fluid level.
Index
Page 4D-20
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a - Suitable Container
b - Thermometer
c - Heat Source
d - Transmission Fluid Temperature Switch
e - Ohmmeter Leads
b
a - Transmission Fluid Temperature Switch With Sealing Washer
b - Harness Wires
e
b
a
d
c
Temperature
180-200 F (82-93 C)
220-240 F (104-116 C)
a
SERVICE MANUAL NUMBER 23
72772
72845
90-861326--1 MARCH 1999