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 TM 9-2320-285-24-1
2-82.
TACHOMETER TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
TACHOMETER INOPERATIVE OR DOES NOT INDICATE CORRECT ENGINE SPEED
Step 1.
Raise instrument panel (para 2-26g(1)).
Check tachometer head and sender unit for loose or incorrect
connections or broken conductor.
a.
If connections are loose or incorrect, tighten or correct (para
b.
If conductor is broken, replace (para 2-86).
c.
If connections and conductor are okay, go to step 2 below.
Step 2.
Check if tachometer head adjustment screw is at position #3.
a.
If adjustment screw is not at position #3, turn to position #3
b.
If adjustment screw is at position #3, go to step 3 below.
Step 3.
Replace tachometer head (para 2-86).
a.
If malfunction is corrected, no further action is required.
b.
If malfunction is not corrected, replace sender unit (para
2-83.
PRESSURE GAGES TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
WATER TEMP, OIL PRESS, OR FUEL GAGE INOPERATIVE
Step 1.
Turn key switch to off position.
Raise instrument panel (para 2-26g(1)).
Connect two flashlight batteries in series and connect (+) and (-)
terminals across gage terminals using jumper wires (if gage pointer
deflects downscale, reverse jumper wires).
Watch gage pointer.
a.
If gage pointer does not deflect to approximately full scale,
gage is defective; replace (para 2-87a, 2-87c, or 2-87d).
b.
If gage pointer deflects approximately full scale, go to step 2.
2-908
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