Chapter 3 Fuel Injection Equipment
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3,4JH3(B)(CJE
Fault
3.
Defective
Engine's injection
output ls
liming. and
insufficient.
other failures.
Nozzle
movements
is defective.
lnjection
pump is
defective.
4.
Idling is rough.
5.
Engine runs at high
speeds, but cuts out
at !ow speeds.
6. Engine doesn't reach
max. rpm.
7.
Loud knocking.
8.
Engine
exhausts
too
much
smoke.
Printed
in
Japan
HINSHI-H8009
When exhaust
smoke is
black:
When exhaust
smoke is
white:
Causa
Remedy
(1)
Knocki09 sounds caused by improper
{too
fast)
injection timing.
Inspect and adjust
(2}
Engine overheats
or
emits large amount of smoke due Inspect and adjust
to improper (to slow) injection timing.
(3)
Insufficient fuel delivery from feed pump.
Repair
or
replace
(1)
Case nut loose.
Inspect and retighten
(2)
Defective injection nozzle performance.
Repair
or
replace nozzle
(3)
Nozzle spring is broken.
Replace
{4)
Excessive oil leaks from nozzle. Replace nozzfe assembly
(1)
Max
delivery limit boll is screwed in too far. Adjust
(2)
Plunger is worn
Replace
(3)
Injection amount
is
not uniform. Adjust
(4} Injection timings are not even.
Adjust
(5)
The
1st and 2nd levers
of
the governor and
the
control
Repair
rack of the injection pump are improperly lined up
(6}
Delivery stopper is loose.
Inspect and retighten
(7}
Delivery packing is defective Replace packing
(8)
Delivery valve seat is defective. Repair or replace
(9)
Delivery spring is broken.
Replace
(1) Movement of control rack is defective.
1) Stiff plunger movement
or
sticking. Repair or replace
2) Rack and pinion lilting is defective. Repair
3) Movement
of
governor is improper Repair
4) Delivery stopper is too tight. Inspect and adjust
(2) Uneven injection volume. adjust
(3) Injection timing
is
defective. adjust
(4)
Plunger is worn and fuel injection adjustment is difficult..
Replace
(5) Governor spring is too weak. Replace
(6) Feed pump can't feed oil at low speeds,
Repair
or
replace-
(7) Fuel supply is insufficient
at
low speeds due to clogging
Disassemble and clean,
of fuel filter.
or
replace element
(1) The wire or rod of the accel. is
caught
Inspect and repair
(2)
Control rack is caught and can't be moved,
Inspect and repair
(,)
Governor spring is broken or excessively worn,
Replace
(2) Injection performance
or
nozzle is poor Repair
or
replace
( 1)
Injection timing is too fast or too slow,
Adjust
(2) Injection from nozzle is improper.
Adjust
Fuel drips after each injection
(3)
Injection nozzle starting pressure is too high
Adjust
{4) Uneven injection.
Adjust
(5} Engine overheats,
or
insufficient compression.
Repair
(1) Injection timing is too last.
Adjust
(2) Air volume intake is insufficient Inspect and repair
{3} The amount of injection is uneven. Adjust
(4) Injection from nozzle is improper. Repair or replace
(1)
Injection timing is too slow.
Adjust
{2}
Water is mixed in fuel.
Inspect fuel system,
and clean
(3) Shortage
or
lube oil in the engine. Repair
(4) Engine
is
over-cooled.
Inspect
3-37
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