Table 4A-1. Compression Pressure Comparison
B. Compression pressure may be leaking
past the cylinder head gasket, the
valve seats, t h e i n j e c t o r t u b e o r a
hole in the piston.
E n g i n e Out of Fuel
The problem in restarting an engine af-
ter it has run out of fuel stems from the
fact that after the fuel is exhausted from
the fuel tank, fuel is then pumped from
the primary fuel strainer and sometimes
partially removed from the secondary fu-
el filter before fuel supply becomes in-
sufficient to sustain engine firing.
Consequently, these components must be
refilled with fuel and the fuel pipe rid of
Figure 4A-3. Inspecting Piston Rings
air in order for the system to provide
adequate fuel for the injectors.
retightened securely before replac-
ing the rocker cover.
When an engine has run out of fuel,
there is a definite procedure to follow for
restarting it:
Primer J 5956 may be used to prime the
entire fuel system. Remove the filler
1. Fill the fuel tank with the recom-
plug in the fuel filter cover and install
mended grade of fuel oil. If only partial
the primer. Prime the system. Remove
filling of the tank is possible, add a min-
the primer and install the filler plug.
imum of ten gallons (38 Iitres) of fuel.
2. Remove the fuel strainer shell and el-
Fuel Flow Test
ement from the strainer cover and fill the
shell with fuel oil. Install the shell and
The proper flow of fuel is required for
element.
satisfactory engine operation. Check the
condition of the fuel pump, fuel strainer
3. Remove and fill the fuel filter and el-
and fuel filter as outlined in Subsection
ement with fuel oil as described in Step
11C under Troubleshooting.
2.
4. Start the engine. Check the filter
Crankcase Pressure
and strainer for leaks.
The crankcase pressure indicates the
NOTE
amount of air passing between the oil
control rings and the cylinder liners into
In some instances, it may be nec-
t h e c r a n k c a s e , m o s t of which is clean air
essary to remove the valve rocker
from the air box. A slight pressure in
cover and loosen a fuel pipe nut to
the crankcase is desirable to prevent the
bleed trapped air from the fuel
entrance of dust. A loss of engine Iu-
system. Be sure the fuel pipe is
4A-4