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 NOTE
NOTE
Teeth of pinion (10) and rack (12) are
Tag
barrel
and
plunger
for
designed so they cannot be meshed
reinstallation identification. Use new
incorrectly.
gaskets at reassembly.
g. Adjustment. Assure that all cylinders are s
(4) Lift out upper guide (13), spring (25), and
lower guide (23).
supplied the same amount of fuel. To do this, proceed
(5) Remove pinion (10) and washer (11).
as follows:
d. Cleaning, Inspection, and Repair.
(1) Inspect for position of control racks. The
pointer on pump body should indicate the same
(1) Wash all parts in clean fuel oil and wipe
graduation on each pump rack. The pumps are all
dry with a lint free cloth.
calibrated to deliver a set amount for each graduation
(2) Inspect springs (3 and 25) for damage.
mark.
Replace a defective spring.
(2) If more than one rack was removed, be
(3) Insert plunger (9) into barrel (26). The fit
sure that injection pump was installed in correct cylinder.
should be snug. Replace plunger and barrel, if worn.
Inspect all racks for same setting. If one is incorrect,
(4) Inspect valve (6) and valve seat (28) for
disconnect it from pinion and mesh teeth so it has the
scratches. If badly scratched, replace valve and seat.
same reading as the other five.
Small scratches are caused by dirty fuel oil, and may be
(3) Install cover (fig. 3-13), then connect fuel
removed by grinding the valve to the seat. Use a fine
line to fuel injector and fuel injection pump.
grade of pumice or jewelers rouge for the grinding.
Place the valve in the seat, then rotate the valve. Wash
NOTE
away all grinding compound in clean fuel oil. Inspect
The fuel injection pump body and
valve and valve seat. When all scratches have been
the injection pump pointer are
removed, the valve and seat can be reused.
stamped with the cylinder number
(5) Inspect rack (12) for burrs or other
corresponding to the fuel injection
damage. Replace a damaged rack.
pump. When more than one fuel
(6) Inspect pinion (10) for bend, or other
injection pump is removed, install
damage, Replace a damaged pinion.
them on the engine in the position
(7) Inspect upper guide (13) and lower guide
from which removed.
(23). If worn, or scratched, replace both guides.
e. Reassembly. Reassemble the fuel injection
3-12. Fuel Injector (Nozzle)
pump in reverse order of disassembly. Assure that no
a. General. The fuel injector (nozzle) is of the
dirt gets into the assembly while putting it together:
spring loaded differential type.
Its purpose is to
f. Installation
atomize, then spray the fuel delivered by the fuel
(1) Insert the fuel injection pump in its
injection pump into the cylinder. The fuel is metered by
housing on engine, in its marked location. Install nuts
the pump; forced under pressure to the injector; where it
(4) on studs (5) and tighten.
is released as a spray into the cylinder, when the
(2) Install rack (12) and adjust it to mesh with
pressure reaches 2,500 psi.
pinion. (10).
b. Removal.
(3) Connect rack (12) to the control lever
(1) Shutoff fuel to engine (34, table 2-4).
(14).
(2) Refer to figure 3-14 and remove the fuel
injector.
3-40
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