After
starting a cold engine, operate it at a speed only slightly faster than
idle (approximately 700 rpm) for a few minutes to allow the engine to
reach normal operating temperature before placing it under full load.
This warm-up period will permit oil to reach all bearing surfaces, thus
reducing the possibility of scoring and premature wear of internal
engine parts.
OIL PRESSURE. With engine turning at
approximately 2000 rpm and the water temperature at 160 degrees F., the
oil pressure should be from 45 to 55 pounds. As bearings wear and the
increased clearances permit more than the normal escape of oil, there
will be a drop in pressure shown on the gauge, particularly at idling
speed. A drop in oil pressure may also be the result of a plugged oil
filter element.
WATER TEMPERATURE. A thermostat (Fig. 16) in the
cylinder block restricts the circulation of liquid in the cooling system
until the liquid has reached a pre-determined temperature, thereby
permitting faster warm-up of the engine. Do not operate the engine with
the thermostat removed as this unit is essential to proper circulation
and efficient engine performance. Without the thermostat, sludge will
form in the crankcase, because the low temperature of the engine permits
condensation of fumes in the crankcase. When operating in hot climates,
the maximum reading of the temperature gauge should not exceed 100
degrees F. above the prevailing atmospheric temperature.
AIR CLEANERS. Remove and service the carburetor
and oil filler cap and crankcase ventilator outlet air cleaners every 50
hours or less, depending on the severity of working conditions.
Operating in dusty areas will require daily service of air cleaners.
IGNITION SYSTEM. Keep the units of the ignition
system clean and properly adjusted.
FUEL SYSTEM. Keep the fuel tank, lines and
filters clean. Always use a good grade of fuel.
COOLING SYSTEM. Do not fill the cooling system
when the engine is overheated. Allow the engine to cool before adding
liquid, in order to prevent cracking the cylinder blocks. Use a good
grade of MOPAR anti-freeze during cold weather, and MOPAR Rust Resistor
during warm weather.
POWER TAKE-OFF AND CLUTCH ASSEMBLY. On units
equipped with the Power Take-Off and Clutch Assembly, avoid unnecessary
use of the shifting lever. Frequent engagement and disengagement of the
clutch causes rapid wear of clutch facings, necessitating frequent
adjustment and replacement of parts. Do not attempt to engage or
disengage the clutch while the engine is accelerated. Do not operate the
unit when the clutch is slipping. See Adjustment Section.
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