TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 59 of 779
Figure 1-16. Late crankcase breather and fire extinguisher system.
1-23. Sending Units and Switches
a. Oil Pressure Sending Unit (fig. 1-1).
The
electrical oil pressure gage sending unit on early
engines was located at the right rear of the right
side of the crankcase in the main oil gallery line.
On late engines, for ease of maintenance, the
sending unit is relocated to the front of the
crankcase at the opening in the gallery line at
No. 1 right cylinder. This sealed sending unit
consists
of
a
threaded
plate
to
which
a
diaphragm, a radially notched spring, and an
overload guard plate are crimped. Electrical
resistance in the sending unit varies directly as
the oil pressure varies. The resulting variation in
the current is transmitted to the electrical oil
gage on the vehicle instrument panel.
b. Low Oil Pressure Warning Light Switch.
The low oil pressure warning light switch is
furnished with the engine and it is located at the
right rear of the right side of the engine crank-
case in the main oil gallery line near No. 5 right
cylinder. The electrical contact points in this
switch close when the oil pressure in the main oil
gallery falls to 1132 psi. The completion of the
electrical circuit lights the low pressure warning
lamp on the vehicle instrument panel.
c. Oil Temperature Sending Unit (figs. 1-1).
The oil temperature sending unit is located at the
1-21
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