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Fuel filter
CHAPTER TWO
FUEL
INJECTION
SYSTEM
/ Fuel return hose
~~W"'----
High pressure fuel pipe
described in Chapter Seven to remove air in fuel. Check
for a clogged or defective fuel injection pump or fuel in-
jector.
WARNING
Wear goggles and protective clothing when
performing the next procedure. Diesel injec-
tors can spray with sufficientforce to pene-
trate the skin. Have
afire
extinguisher rated
for
fuel and electricalfires on hand.
To identify a faulty fuel injector on multicylinder en-
gines, loosen the fuel injector fuel line nut with the engine
running to reduce fuel pressure (only slight loosening is
required).
If
the engine runs worse, the injector is operat-
ing satisfactorily.
If
the engine runs the same, the injector
or the fuel injection pump is not operating properly.
If
no
fuel appears at the fuel line, the fuel injection pump is de-
fective.
6. Engine
knocks-Check
the fuel injection pump timing
as described in Chapter Seven. Check for a defective fuel
injection pump.
COOLING SYSTEM
The engine may be equipped with a seawater cooling
system or freshwater cooling system. Refer to Chapter
Eight for identification and description ofthe cooling sys-
tem.
Engine Overheating
A problem in the cooling system generally causes en-
gine overheating; however, other engine problems can
also cause overheating. Note the possible causes in the
following list:
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