Onan DJA Series User Manual

SOUNOID -j BEHIND STOP
GASKET
DECOMPRESSION SOLENOID
FlUNGEI RELEASED IN STOPPED
POSITION '
DECOMPRESSION
RELEASE ARM
EXHAUST VALVE ROCKER ARM
DECOMPRESSION
RELEASE ARM IN
RUNNING POSITION
LOCI NUT
DECOMPRESSION
RELEASE ARM AND
sn SCREV
IN STOPPED POSITION
— EXHAUST
ROCIER ARM
(BROKEN LINE INDICATES
MOVEMENT WHEN
UNLOCKED)
FIGURE 18. DECOMPRESSION RELEASE
When assembling the rocker box cover, remove the
solenoid and remount it when the cover is on the
engine.
INJECTION PUMP
The single outlet pump is mounted on the left side of
the engine crankcase. The camshaft operates the pump
plunger producing pressure to deliver fuel and open the
injection nozzle. A control sleeve in the pump meters
fuel by controlling the length of time the plunger part
is closed in each stroke.
Timing the pump to the engine determines the port
closing point (17
0
BTC), PC mark on flywheel. See
Figure 19. The control sleeve position controls port
opening and is, in turn, controlled by the throttle
setting.
Repair: Most fuel system troubles are not due to a
faulty injection pump. Test the rest of fhe fuel system
before condemning the injection pump.
Onan discourages field repair of the injection pump
because of the exceptionally close tolerances between
parts and the specialized equipment necessary for
repair. The injection pump is an expensive part of the
unit and even a particle of dirt as fine as talcum powder
could score its working surfaces. If the rest of the fuel
system is in working order and fuel delivery is abnor-
mal, remove the pump for replacement or repair. Ameri-
can Bosch maintains a worldwide repair service for
these pumps.
Removal: Remove the pump inlet and outlet lines.
Remove the two capscrews holding the pump to the
engine and lift it off. Don't lose the shims. They time
the injection pump to the engine. Cap all openings in
the pump and fuel lines to keep dirt out of the fuel
system.
PC
(PORT CENTER)
} " TIMING
y\ POINTER .-^M
GEAR COVER —"Mv/
GOVERNOR
ARM y
FIGURE 19. INJECTION PUMP TIMING
20

Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English