ROCKER
ARM
BODY
PRIMING
LEVER
COVER-J
DIAPHRAGM
J
ASSEMBLY-
DIAPHRAGM
SPRING
ROCKER
ARM PIN
VALVE
AND
CAGE
ASSEMBLIES
ROCKER
ARM
SPRING-
ROCKER
ARM
LINK
FILTER
SCREEN
FILTER
BOWL
FIGURE
16.
FUEL
TRANSFER
PUMP
GOOD
SPRAY
PATTERN
'A'.'U
POOR
•'Bl
''
v
SPRAY
PATTERN
FIGURE
17.
NOZZLE
SPRAY
PATTERN
ACCESS PLUG
PRESSURE
ADJUSTING
SCREW
SPINDLE
ASSEMBLY
FUEL INLET
AIR COOLED ENGINE
COVER
BASKET
. SPRING
ALUMINUM
ADAPTER
CYLINDER HEAD
1777777/77
i ASBESTOS GASKET
HEAT SHIELD
NOZZLE CAP
NUT
NOZZLE GASKET
COPPER GASKET
PRECOMBUSTION CHAMBER
CORRECT PARTS IDENTIFICATION FOR
ALL AIR COOLED ENGINES.
Disassembly
When removing and disassembling nozzles, separate
and label all nozzle components. Never interchange
components between nozzles.
1.
Remove nozzle assembly from the engine and
remove the fuel inlet and return lines.
Clamp the nozzle holder body in a vise and
remove the nozzle cap nut and nozzle.
Install the nozzle cap nut loosely to protect the
lapped surface for the holder body.
If necessary to further disassemble the nozzle,
reverse the pressure adjusting screw and lift out
the spring and spindle assembly.
•2.
3.
4.
FIGURE
18.
NOZZLE
ASSEMBLY
Cleaning
The most important part of nozzle cleaning is
cleanliness.
Work only in a clean room, on a clean work bench.
Keep a pan of diesel fuel handy and have a supply of
clean,
lint-free wiping rags.
Onan offers a kit to aid nozzle cleaning. See SPECIAL TOOLS
section.
Never use hard or sharp tools, emery paper, grinding
powder or abrasives of any
kind.
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.
19
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