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OM-2031
6. Engine Fuel
A. Recommendations/Specifications
The quality of fuel oil used in the diesel engine is a major factor in engine performance and life. Fuel
oil must be clean, completely distilled, stable and non-corrosive. Use low sulphur content fuel having
a cloud point that is at least 10
temperature at which crystals begin to form in diesel fuel. The viscosity of the fuel must be kept
above 1.3 centistrokes to provide adequate fuel system lubrication.
WARNING ! Do not mix gasoline or alcohol with diesel fuel. This mixture can
cause an explosion.
Caution: Due to the precise tolerances of diesel injection systems, it is
extremely important that the fuel be kept clean and free of dirt or water. Dirt
or water in the system can cause severe damage to both the injection pump
and the injection nozzles.
Use ASTM No. 2D fuel with a minimum Cetane number of 40. No. 2 diesel fuel gives the best
economy and performance under most operating conditions. Fuels with Cetane numbers higher than
40 may be needed in high altitudes or extremely low ambient temperatures to prevent misfires and
excessive smoke.
At operating temperatures below 0
"winterized" No. 2D.
NOTE: No. 1D fuels can be used, but fuel economy wil be reduced.
Caution: Low viscosity fuel such as Jet-A fuel, will cause excessive wear on
the engine fuel pump and reduce its life expectancy unless lubricating oil is
added to the Jet A fuel.
Jet-A fuel - which is a low viscosity fuel - may be used, provided that lubricating oil is added to the
diesel fuel in the amount of 5% of the fuel mixture. Use one quart of lubricating oil per 5 gallons of Jet-
A fuel.
B. Fuel Filter
Refer to Cummins Shop Manual in Chapter 6 for instructions on removal and replacement of fuel filter
elements.
7. Engine Cooling System
A. General
Cooling system device requires much more than maintaining the proper coolant level in the radiator.
During warm seasons and in warm climates, plain water can be used as a coolant if the system is
protected against rust by a rust inhibitor additive. During cold seasons and in cold climates, the
system must, of course, be protected against freezing. At no time should the system be operated for
any length of time on plain water, without a rust inhibitor or antifreeze. Draining, cleaning, and filling
the cooling system are covered in Para. 7, E through H.
2-1
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o
below the lowest expected fuel temperature. Cloud point is the
o
o
C (32
F), use a blend of No. 1D and No. 2D fuels, also known as
November 18/91 Revised
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