Chapter 3 Fuel Injection Equipment
Jl. Troubleshooting
i
4LHA Series
i
Malfunctions
The
engine
exhaust
contains
smoke
and the
engine
"knocks"
The
engine
output
is
unstable
Insufficient
output
1. The injection
quantity is
insufficient
2.
The injection
timing is too
advanced
and
the engine is
"knocking"
Causes
1. The injection timing is incorrect
2.
The nozzle or nozzle holder is
functioning incorrectly
3.
The injection quantity is
excessive
1. The fuel
filter
element is clogged
and
fuel oil delivery is poor
2.
The amount of fuel or pressure
delivered by the feed pump is too
little
3.
The injection pump is sucking air
4.
The regulating valve is stuck in
the open position
5.
The plunger is sticking and does
not travel its
full
stroke
6. The plunger spring is broken
7. The control sleeve is not sliding
smoothly
8. The governor lever is not
operating properly or is worn
excessively
9.
The delivery valve spring is
broken
10.
The delivery valve is not sliding
properly
11.
The nozzle or the nozzle holder
is
not functioning properly
12.
The injection timing is incorrect
1. The specified full-load injection
quantity is not delivered
2.
The control lever is not reaching
the maximum speed position
3.
The governor spring is weak and
therefore the governed speed is
too low
4.
The plunger is worn
5.
The delivery valve seating
portions are damaged
Remedies
Readjust
the timing
Inspect, then repair or replace
Readjust
Clean
or replace
Inspect and repair
Inspect and repair
Replace
Replace
the distributor assembly
Replace
Repair
or replace
Repair
or replace
Replace
Repair
or replace
Inspect, and then repair or replace
Readjust
Readjust
Readjust
Replace
Replace
the distributor assembly
Replace
Readjust
3-1-56
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