TM 5-3825-225-14&P
b.
Installation.
(1)
Install starter switch (4, Appendix F, Figure 1) to control panel with knurled nut.
(2)
Install ignition switch (1) to control panel with knurled nut.
(3)
Install fuse (3) in tattletale switch (2).
(4)
Install tattletale switch (2) to control panel with washer and retaining nut.
(5)
Connect wires to tattletale switch, ignition switch, and starter switch as tagged (see Figure 4-5).
4-15.
ELECTRICAL GAGES AND TACHOMETER MAINTENANCE.
a.
Removal (See Figures 4-5 and 4-6).
NOTE
All lead wires should be tagged to ensure proper installation.
(1)
Disconnect lead wires from back of temperature gage (4, Appendix F, Figure 2).
(2)
Remove mounting nuts and mounting bracket from the back of engine instrument control panel.
(3)
Remove temperature probe from engine head and temperature gage (4) from control panel.
(4)
Disconnect wire leads and hose from oil pressure gage (5).
(5)
Remove mounting nuts, mounting bracket, and oil pressure gate (5) from control panel.
(6)
Disconnect lead wires from back of ammeter (6).
(7)
Remove mounting nuts, mounting bracket, and ammeter (6) from control panel.
(8)
Remove socket and light bulb )2) from back of tachometer (1).
(9)
Disconnect lead wires from tachometer (1).
(10)
Remove mounting nuts, mounting bracket, and tachometer (1) from control panel.
NOTE
The tachometer sending unit is located on the camshaft side of the engine..
(11)
Remove tachometer sending unit from the engine block (see Figure 4-6).
Figure 4-6. Tachometer Sending Unit.
b.
Testing Temperature Gage. The temperature gage can be tested without removing the gage from the
engine instrument control panel. This switch is used in conjunction with the tattletale switch and is set to actuate at
200°F (93°C).
(1)
Remove the temperature probe from the engine block and place it in a container of water heated to a
known temperature above 200°F (93°C).
NOTE
Use a calibrated thermometer to measure the actual water temperature.
(2)
Compare the actual temperature with the temperature gage reading. If the readings differ by 5°F (
15°C), replace the temperature gage.
TA506320
4-15
