4-138. ENGINE SENDING UNITS
THIS TASK COVERS: a.
Oil Pressure Sending Unit
Hour Meter Sending Unit
Water Temperature Sending Unit
Too[ Kit, General Mechanics, Automotive
Main Engine Shutdown (see para 2-12.)
(Appendix B, Section iii, Item 1)
APU Shutdown (see para 2-16.)
Batteries Disconnected (see para 4-114.)
Engine Compartment Covers Open
a. Oil Pressure Sending Unit.
(a) Run main engine and monitor oil pressure
gauge on pump panel and in cab. Each
gauge is supplied from a different sender.
(b) If no pressure is recorded on pump panel
gauge, replace gauge assembly on pump
panel (see para 4-18).
(c) If no pressure is recorded on gauge in cab,
ground the S terminal on gauge. If gauge
does not register, replace gauge.
(d) If gauge registers, either sending unit or
wire is at fault.
(e) To check wires for continuity (see Wiring
Diagrams, Appendix H). To replace
sending unit, see para (2) and (3) below.
(a) Tag and disconnect wires (1) from
sending unit (2).
(b) Remove sending unit (2) from fitting (3).
(a) Install new sending unit (2) in fitting (3).
(b) Connect wires (1) to sending unit (2).