Probable cause
Possible remedy
Excessive
injection quantity Stop lever jammed in "increase"
Repair lever link properly, placing
position.
lever in neutral position.
Improper full -load setting
of
Adjust governor setting on bench.
governor
Loose plunger pinions
Reinstall properly by matching
stamped marks.
Improper fuel spray from
Sticking needle
valve
(s)
in
one
Repair and replace nozzles
if
injection nozzles or more nozzles necessary.
Damaged nozzle tip seats
Repair and replace seats
if
necessary.
Worn
or broken nozzle springs
Replace nozzle springs.
Extremely low injection pressure
Adjust Pressure to
120 ± Skg/cm
2
(l706.4±71.l
Ib/in
2
)
on nozzle
tester by inserting
shim
(s).
Carbon deposited on packings
Remove carbon.
at nozzle tips
Injection timing too advanced
Improper installation
of
fuel
Re
- time properly by tilting injection
Injection pump
pump toward engine.
Incorrect installation
of
timing
Re
- time timing
gear
train.
gears
Injection timing
to
retarded
Improper installation
of
fuel
Re
- time properly by tilting injection
injection pump pump outward.
Incorrect meshing
of
timing
Re
- time timing
gear
train.
gears
Worn
cams, tappets or bearings
Replace.
of
fuel injection pump
Poor grade
of
fuel oil Poor grade
of
fuel oil
Use
good quality fuel.
Water
in fuel
Use
good quality fuel.
Low oil pressure
Lack
of
oil
in
oil pan Add oil to prescribed level.
Air in oil strainer
Replace damaged pipes
or
packings.
Retighten loose parts.
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