FIGURE
16.
INJECTION NOZZLE TESTER
Never use hard or sharp
tools,
emery paper,
grinding powder or abrasives
of
any kind or
the nozzles may be damaged beyond use.
Soak each nozzle
in
fuel to loosen dirt. Then clean the
inside with a small strip of wood soaked in oil and the
spray hole with a wood splinter.
If
necessary, clean
the outer surfaces of the nozzle body with a brass
brush but do not attempt to scrape carbon from the
nozzle surfaces. This can severely damage the spray
hole. Use a soft oil-soaked rag or mutton tallow and
felt to clean the nozzle valve.
NOZZLE REPAIR
If cleaning will not eliminate a nozzle defect, replace
the nozzle or take it to an authorized American Bosch
service station.
Do
not attempt to replace parts of the
nozzle except for nozzle and pintle assembly.
Assembly
Rinse both valve and nozzle thoroughly before
assembly and coat with diesel fuel. The valve must be
free in the nozzle. Lift
it
about 1/3 out of the body.
It
should slide back to its seat without aid when the
assembly is held at a 45-degree angle.
If
necessary,
work the valve into its body with clean mutton tallow.
1.
Clamp nozzle holder body in a vise.
2. Set valve in body and set nozzle over it.
3. Install nozzle cap nut loosely.
4. Place centering sleeve over nozzle for initial
tightening. Then remove centering sleeve to
prevent
it
from binding between nozzle and cap
nut.
5.
Adjust to specified torque.
NOZZLE
1
NSTALLATI
0
N
Before installing the injection nozzles in the engine,
thoroughly clean each mounting recess.
A dirty mounting surface could permit blow-by,
causing nozzle failure and
a
resulting power
loss.
1. Install
a
new heat shield
to
head gasket
in
cylinder
head recess.
2. Install heat shield, a new nozzlegasket and nozzle
adapter.
3.
Insert nozzle assembly into recess.
Do
not strike
tip against any hard surface.
4. Install nozzle flange and two cap screws. Tighten
cap screws alternately to avoid cocking nozzle
assembly. Tighten each to 20-21 foot-pounds (27-
28 Nom).
FUEL SOLENOID
The fuel shutoff solenoid (Figure 17) is also referred
to as a governorsolenoid as
it over-rides
thegovernor
during shutdown. The solenoid is mounted on the
cylinder air housing bottom pan and controls the
injection pump operating lever. When energized, the
plunger pulls into the solenoid body. When
de-energized, the solenoid spring forces the plunger
out against the operating lever to hold it in the fuel
shutoff position.
The solenoid has two coils. Both are energized for
pulling the plunger up. When the plunger reaches the
top, it opens a set of contacts, de-energizing the pull-
in coil. The other coil holds the plunger up while the
engine is running and de-energizes when the engine
shuts down.
SOLENOID
~
WIRE
TO
CONTROL
FUEL
D
TO GROUND
RETURN
FITTING
NGER AND SPRING
GOVERNOR LINKAGE
ADJUSTMENT SCREW
AND JAM NUT
JECTION PUMP
(RDJE)
IN
J
ECTl ON PUMP
DELIVERY VALVE CAPSCREW
FIGURE
17.
FUEL
SOLENOID
21
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