the filter media. Always be sure not to let any contaminated water back into the outlet neck.
b.
A mild detergent may also be used. However, the filter must then be flushed thoroughly with
clean water. This cleaning method is recommended by the manufacturer.
c.
Always allow filter media to dry before use.
c. Disposal
Normal trash pick-up is acceptable.
NEVER
burn the air filter for disposal.
4.
Engine Fuel
a. Quality
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.
The Cummins engine has been developed to take advantage of the high energy content and
generally lower cost of No. 2 Diesel Fuel. The engine will also operate satisfactorily on No. 1 fuel. If
other fuels are being considered, refer to the Cummins Operation and Maintenance Manual for fuel
specifications and recommended fuel oil properties.
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 32º F (0º C), use a blend of No. 1D and No. 2D fuels, also known
as “winterized” No. 2D.
NOTE:
No. 1D fuels can be used, but fuel economy will be reduced.
b. Fuel Filter (Fig. 8)
A double element fuel filter is located between the fuel source and the pump. Its function is to
remove foreign material from the fuel before it enters the fuel pump. The filter operates under
vacuum. Elements are the throwaway type, in which the case and element are made as one
disposable part.
(1)
Check fuel filter restriction
The most accurate method of determining filter change requirement is by measuring the fuel
pressure drop across filters.
The measurement of pressure drop across filters is 5 psi (9 kPA).
(2)
Changing fuel filter elements
Change elements after each 200 hours of operation unless a restriction test indicates the time
period should be extended.
•
Replacement primary fuel filter elements are Hobart No. 286897-004.
•
Replacement secondary fuel filter elements are Hobart No. 286897-005.
a.
Unscrew element and discard.
NOTE:
The elements should be removable by hand. If not, there are several types of filter element
removal tools.
CAUTION
OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
November 27/1997
Chapter 2-2
Page 7