TROUBLESHOOTING
116 6LY3 Operation Manual
TROUBLESHOOTING CHART
Symptom Probable Cause Measure Reference
Alarm indicators and
alarm sound come on in
the display during
operation.
Shift to low speed operation immediately, and check which indicator has come on
in the display. Stop the engine for inspection. If no abnormality is identified and
there is no problem with operation, return to the port at lowest speed and request
repairs.
• Lube oil low pressure
alarm indicator comes
on.
• Engine lube oil level is low. • Check lube oil level.
Add or replace.
Checking Engine
Oil on page 45
• Lube oil filter clogged. • Replace lube oil filter.
Replace lube oil.
Replace Engine
Oil and Engine Oil
Filter on page 96
• Marine gear lube oil
pressure alarm
indicator comes on.
• Marine gear lube oil is low. • Check the oil level and
supply. —
• Coolant high
temperature alarm
indicator comes on.
• Coolant/fresh water in coolant
tank is low.
• Check coolant level
and replenish.
Check Diesel
Fuel, Engine Oil,
and Engine
Coolant Levels on
page 52
• Insufficient seawater causing
temperature to rise.
• Check seawater
system.
—
• Contamination inside cooling
system.
• See your authorized
Yanmar marine dealer
or distributor.
—
Faulty Warning Devices
Do not operate the engine if alarm devices are not repaired. Serious accidents may
result if difficulties are not spotted due to faulty alarm lamps.
(1) When switch is turned ON:
• Alarm buzzer sounds. • Circuit broken.
Note: Alarm buzzer only sounds
when there is an abnormality.
• See your authorized
Yanmar marine dealer
or distributor.
—
• Alarm indicator comes
on.
• Circuit broken.
Note: Alarm indicator only comes
on when there is an abnormality.
• See your authorized
Yanmar marine dealer
or distributor.
—
(2) When the rocker switch returned to ON from START after engine starts:
• Buzzer keeps on
sounding.
• Sensor switches faulty - if
indicator does not come on.
• Short-circuit - if indicator does
not come on.
• See your authorized
Yanmar marine dealer
or distributor.
—
• One of the alarm
indicators comes on.
• Sensor switches engine faulty. • See your authorized
Yanmar marine dealer
or distributor.
—
• Battery low charge
indicator comes on
during operation.
• V-belt is loose or broken. • Replace V-belt; adjust
tension.
Adjust Alternator
V-Belt Tension on
page 103
• Battery defective. • Check battery fluid
level, specific gravity.
Replace.
Check the
Battery on
page 101
• Alternator power generation
failure.
• See your authorized
Yanmar marine dealer
or distributor.
—
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