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 TM 5-1940-277-10
TM 1940-10/1
ENGINE INSTRUMENT PANEL GAGE READINGS
Idle speed
650 to 750 rpm
Operating speed
1000 to 2000 rpm
Maximum speed (under load)
2500 rpm
Engine oil pressure gage
2
Idle speed
20 to 30 Ib/in
(1.4 to 2.1 Kp/cm2)
2
40 Ib/in or above
Operating speed
2
(2.8 Kp/cm )
Coolant temperature gage (fresh water system)
Below 195
Normal
F
(90 )
C
Above 195
Overheating
F
(90 )
C
Battery condition meter (engine not running, no electrical load)
Battery fully charged
25.4 volts or above
Battery half charged
24.6 to 25.4 volts
Battery fully discharged
23.7 volts or below
NOTE
The above readings are most reliable if the batteries have stood for at least 8 hours with out
charge or discharge.
Battery condition meter (engine running about 1500 rpm and no
electrical load)
Battery near to fully charged
27.0 to 28.0 volts
Battery partially discharged
24.0 to 27.0 volts
Battery charge low
Below 24.0 volts
Battery condition meter (normal operation)
Above 24 volt
Alternator output
matching or greater
than electrical
load
Below 24 volts
Load in excess of
alternator output
1-11
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