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TM 9-2320-270-10
DRIVING
Basic Driving Guidelines
Avoid Unncessary Engine Idling. During long engine idling periods, the engine coolant tem-
perature will fall below the normal operating range. The incomplete combustion of fuel in a cold
engine will cause crankcase dilution, formation of lacquer or gumming deposits on the valves,
pistons, and rings, and fast collection of sludge in the engine. When long idling time is necessary,
maintain at least 800 rpm as indicated on tacograph (3).
Check Gages and Indicators Often. During normal driving conditions, at engine rpm range 1800
to 2100 rpm indicated on tacograph (3), engine OIL PRESSure gage (1) should read from 30 to
70 psi (205 to 463 kPa). Engine WATER Temperature gage (4) should read above 140oF
60oC) at the low end and UP to 200oF (93oC) at the high and. Normal water temprrature is
from 160° to 185°F (71° to 850C). The AIR PRESSure gage (5) should register at least 60 psi
(414 Pa). If not, the low air pressure warning light and buzzer will come on. Normal air pres-
sure for driving is 90 to 120 psi (615 to 820 kPa).
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