Installation manual
ENGINE
TROUBLESHOOTING
Problem
Probable
Cause
Verification/Remedy
Engine
overheats.
1.
Raw
water
not
circulating.
1.
Raw
water
pump
failure.
Check
impeller
-
replace.
2.
Coolant
not
circulating.
2.
Obstruction
at
raw
water
intake
or
raw
water
filter.
2a.
Thermostat
-
remove
and
test
in
hot
water.
Replace
thermostat.
2b.
Loss
of
coolant
-
check
hoses,
hose
clamps,
drain
plug,
etc.
lor
leaks.
2c.
Broken
or
loose
belts
-
tighten/replace.
2d.
Air
leak
in
system;
run
engine
and
open
the
pressure
cap
to
bleed
air.
Add
coolant
as
needed.
Engine
alarm
sound
pulsates.
1.
Loss
of
oil.
1.
Check
dipstick,
look
for
oil
leaks
at
oil
filter
and
at
oil
drain
hose
connection.
2.
Oil
pressure
switch.
2.
Replace
oil
pressure
switch.
Engine
alarm
sounds
continuously.
1.
Engine
coolant.
1.
Check
engine
coolant
level.
2.
High
temperature
switch
opens
at
.
2.
Check
for
satisfactory
operation
with
switch
bypassed,
too
Iowa
temperature.
check
with
ohmmeter,
replace
if
faulty.
Exhaust
smoke
problems
1.
Blue
smoke.
1.
Incorrect
grade
of
engine
oil.
1a.
Crankcase
is
overfilled
with
engine
oil
(oil
is
blowing
out
through
the
exhaust).
2.
White
smoke.
2.
Engine
is
running
cold.
2a.
Faulty
injector
or
incorrect
injector
timing.
3.
Black
smoke.
3.
Improper
grade
of
fuel.
3a.
Fuel
burn
incomplete
due
to
high
back-pressure
in
exhaust
or
insufficient
air
for
proper
combustion
(check
for
restrictions
in
exhaust
system;
check
air
intake).
3b.
Improperly
timed
injectors
or
valves,
or
poor
compression.
3c.
Lack
of
air
-
check
air
intake
and
air
filter.
Check
for
proper
ventilation.
3d.
Overload.
TROUBLESHOOTING
COOLANT
TEMPERATURE
AND
OIL
PRESSURE
GAUGES
If
the
gauge reading
is
other than what is nonnally indicated
by
the
gauge when the instrument panel
is
energized, the first
step
is
to
check for
12
volts DC between the ignition (B+)
and
the
Negative
(B-)
tenninals
of
the gauge.
Assuming that there is
12
volts as required, leave the
instrument panel energized and perfonn the following steps:
1.
Disconnect the sender wire at the gauge and see if the
gauge reads zero, which
is
the nonnal reading for this
situation.
2.
Remove the wire attached to the sender tenninal at the
sender and connect it
to
ground. See if the gauge reads
full
scale, which
is
the nonnal reading for this situation.
If
both
of
the above gauge tests are positive, the gauge
is
undoubtedly
OK
and the problem lies either with the
conductor from the sender
to
the gauge or with the sender.
If
either
of
the above gauge tests are negative, the gauge
is
probably defective and should be replaced.
Assuming the gauge
is
OK, check the conductor from the
sender
to
the sender tenninal at the gauge for continuity.
Check that the engine block
is
connected
to
the ground.
Some starters have isolated ground tenninals and if the
battery
is
connected
to
the starter (both plus and minus
tenninals), the ground side will not necessarily be connected
to the block.
Engines & Generators
30