Installation manual
ENGINE
TROUBLESHOOTING
3.
Engine
lacks
power
and/or
makes
black
smoke
Problem
Probable
Cause
Remedy
Operating
conditions
1.
Engine
overloaded.
1.
Reduce
the
load.
2.
Power
reduction
due
to
altitude
and/or
ambient
temperature
has
not
been
considered.
3.
Clogged
air
filter.
3.
Clean/replace.
Faulty
fuel
supply
1.
Gasket
under
injector
missing
or
1.
Correct
the
number
of
gaskets.
too
many
gaskets
are
installed.
2.
Fuel
filter
clogged.
2.
Replace
filter.
3.
Faulty
injection
nozzle.
3.
Check/replace
nozzle.
4.
Faulty
injection
pump.
4.
Check/repair/replace
pump
Engine
condition
1.
Excessive
carbon
on
piston
and
1.
Decarbonize.
cylinder
head.
2.
Faulty
piston
rings.
2.
Check/replace
piston
ring
set.
3.
Worn
piston
and
cylinder.
3.
Overhaul
engine.
4.
Worn
bearings.
4.
Overhaul
engine.
4.
Faulty
running
Engine
overheats
1.
Engine
ove~oaded.
1.
Reduce
load.
2.
Faulty
raw
water
pump
impeller.
2.
Replace
impeller.
3.
Faulty
thermostat.
3.
Check/replace
thermostat.
4.
Clogged
raw
water
intake
strainer.
4.
Clean
the
strainer.
5.
Lube
oil
level
too
high.
5.
Drain
to
proper
level.
6.
Faulty
injector
nozzle.
6.
Check/replace
nozzle.
Knocking
1.
Injector
needle
sticking.
1.
Replace
nozzle.
2.
Fuel
timing
too
far
advanced.
2.
Adjust
timing.
3.
Broken
piston
ring.
3.
Replace
piston
ring
set.
4.
Worn
piston.
4.
Replace
piston
and
liner.
5.
Worn
bearings.
4.
Replace
bearings.
6.
Loose
flywheel.
6.
Tighten
flywheel
nut.
Engine
is
hunting
1.
Engine
is
overheating.
1.
See
Engine
Overheats,
above.
2.
Air
in
fuel
lines.
2.
Check
fuel
system
for
leaking
connections.
3.
Governor
sticking
or
defective.
3.
Free
the
governor
or
replace.
4.
Fuel
filter
clogged.
4.
Replace
filter.
Engine
stops
suddenly
1.
Fuel
tank
is
empty.
1.
Fill
tank.
2.
Vent
hole
in
fuel
tank
cap
is
plugged.
2.
Replace
tank
cap.
3.
Vapor
lock
(fuel
is
too
hot).
3.
Cool
the
fuel.
4.
Clogged
injector.
4.
Replace
nozzle.
5.
Fuel
line
is
broken.
5.
Replace.
6.
Seized
piston.
6.
Replace
piston
and
liner.
7.
Seized
crankshaft.
7.
Repair/replace
crankshaft
and
bearings.
(continued)
Engines & Generators
40