MCi Crusader II 1989 Maintenance Manual page 309

Date
1-1-89
Page ___
9 -_ 1 _ _
MC-9 MAINTENANCE MANUAL
FUEL PIPES
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OPTIONAL
FUEL INJECTOR
SHUT-OFF COCKS
FUEL PUMP
FUEL STRAINER
(PRIMARY)
i--n-r-.,....,...,;.-FUEL FILTER
(SECONDARY)
Figure9-1. Fuet System.
FUEL SYSTEM
The fuel system consists of a fuel tank. fuel lines. filter.
strainer, pump, fuel manifolds (integral in cylinder heads), fuel
pipes (inlet and outlet), and injectors. The fuel system is illus-
trated in figure 9-1. For further information on engine fuel sys-
tem components. consult the appropriate Detroit Diesel Engine
Service Manual.
Fuel is drawn from the tank, through the primary filter enter-
ing the fuel pump at the inlet side. The fuel is then forced
through the secondary filter into the manifold and then to the
inlet side of the injectors. Surplus fuel returns from the outlet
side of the injectors to outlet fuel pipes, into the return manifold
and back to the fuel tank_ The accelerator linkage connects the
accelerator pedal to the governor. Engine speed is controlled
through the governor; details may be found in Detroit Diesel
Engine Service Manuals.
"IESEL FUEL
The quality of fuel oil used for high-speed diesel engine
.operation is a very important factor in obtaining satisfactory
engine performance, long engine life, and acceptable exhaust
emission levels.
Detroit Diesel Allison designs, develops and manufactures
commercial diesel engines to operate on diesel fuels classified
by the ASTM as Designation 0-975 (grades 1-0 and 2-0).
These grades are very similar to grades OF-17 OF-2 of Federal
Specifications W-F-800. .
Burner fuel (furnace oils or domestic heating fuels) generally
require an open flame for satisfactory combustion. The ignition
quality (cetane rating) of burner fuel (ASTM 0-396) is poor
compared to diesel fuels (ASTM D-975).
In some regions, however, fuel suppliers may distribute one
fluid that is marketed as either diesel fuel (ASTM 0-975) or
domestic heating fuel (ASTM 0-396) sometimes identified as
burner, furnace or residential fuel. Under these circumstances.
the fuel should be investigated to determine whether the prop-
erties conform with those indicated in the Fuel Oil Selection
Chart (figure 9-2).