4-24. ELECTRICAL SYSTEM - Continued
4-24.10 Sending Units and Warning Switches - Continued
Engine Water Temperature, Gage and Alarm Sensor,
Engine Transmission Oil Pressure, Gage and Alarm
Sensor, Engine Oil Pressure (including fuel pump
shutdown) sensors. All these sensors are similar. The
general procedure outlined below should be used to
replace any of these sensors.
Check APU is shutdown (see Chapter 2) and
disconnect batteries as detailed in para. 4-24.12
prior to replacing any sender unit.
Tag and remove wires connected to the sensor
Using wrench, carefully remove sensor from
engine or transmission block. If sensors are
extremely tight, soak visible threads with
penetrating oil (item 20, Appendix E) prior to
Replace sensor and tighten securely. Do not
overtighten. Do not seal with pipe sealant or
Connect wires as noted in step 1. Test sensor as
detailed in TEST preceding.
Ammeter Shunt Replacement.
Disconnect batteries, see para. 4-24.12.
Tag and remove wires from both terminals of the
Removing mounting capscrews (1) and nuts (3)
and discard shunt (2).
Attach new shunt using capscrews (1) and nuts
Reconnect wires to both terminals of shunt as
noted in step 2 preceding.
Test shunt as detailed in TEST preceding.