Chapter 3 Fuel Injection Equipment
IL Troubleshooting
, 4LHA Series
11. Troubleshooting
Malfunctions
The
engine
does
not
operate
1.
Fuel
oil is not
injected from
the injection
pump
2.
Injection timing
is
incorrect
3.
The nozzle does
not operate
The
engine
operates,
but
only
for a
short
time
The
engine
"knocks"
Causes
1. There is no fuel oil in the fuel
tank
2.
The fuel line from the fuel tank is
blocked
3.
The fuel
filter
is clogged
4.
There is air in the fuel
filter
or the
pump chamber
5.
The accelerator linkage is not
properly connected
6.
The magnet valve wiring is
broken or its armature is sticking
7. The feed pump blades are
sticking,
and therefore not
operating
8.
The drive gear or woodruff key is
broken
1. The drive gear or belt
connections
are incorrect
2.
The injection pump is incorrectly
installed
on the engine
3.
The roller holder
assembly's
roller
or
pin is worn excessively
4.
The plunger is worn excessively
1. The nozzle or nozzle holder is
functioning incorrectly
1. The pipe(s) to the injection pump
is
blocked, or the fuel
filter
is
clogged
2.
The fuel oil contains air or water
3.
The feed pump's delivery
quantity (or pressure) is
insufficient
1. The injection timing is too
advanced
2.
The nozzle or nozzle holder is
functioning incorrectly
Remedies
Supply
fuel and bleed the system
Clean
or replace
Clean
or replace
Bleed
the system
Repair
.
Repair
or replace
Repair
or replace
Replace
Repair
Repair
and adjust injection timing
Replace
the assembly
Replace
the distributor assembly
Inspect, then repair or replace
Clean
or replace the pipe(s) or
fuel
filter
Bleed
of air or replace the fuel oil
Repair
or replace
Readjust
the timing
Inspect, then repair or replace
3-1-55
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