TROUBLESHOOTING
GM Series Operation Manual 67
12/05
TROUBLESHOOTING CHART
Symptom Probable Cause Measure Reference
Indicators light on the
instrument panel and
alarm sounds during
operation.
Shift to low speed operation immediately, and check which indicator has come on.
Stop the engine and inspect. If no abnormality is identified and there is no problem
with operation, return to port at lowest speed and consult authorized Yanmar
Marine dealer or distributor.
• Engine oil low pressure
alarm indicator lights
Engine oil level is low. Check engine oil level. Add or
replace.
See Checking the
Engine Oil on
page 30.
Engine oil filter is clogged. Replace engine oil filter.
Replace engine oil.
See Replacing the
Engine Oil Filter
Element on page 55.
• Water in sail-drive seal
indicator lights
Rubber sail-drive seal is
broken.
Consult authorized Yanmar
Marine dealer or distributor.
—
Coolant High Temperature
Alarm lights
Insufficient seawater
discharge causing
temperature to rise
Check seawater system.
—
Contamination inside
cooling system
Consult 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 abnormalities are not identified because of faulty indicators or alarm.
Indicators Do Not Light
• The tachometer does
not turn on, even
though the power
switch is turned on
No electrical current
available.
The battery switch is turned
off, the fuse (3 A) on the
instrument panel is burned
out or the circuit is broken.
Consult authorized Yanmar
Marine dealer or distributor.
—
One of the indicators does
not go out.
Sensor switch is faulty. Consult authorized Yanmar
Marine dealer or distributor.
—
Battery low charge
indicator does not go out
during operation.
V-belt is loose or broken. Replace V-belt or adjust
tension.
See Checking and
Adjusting the
Alternator V-Belt
Tension on page 56.
Battery is defective. Check battery fluid level and
specific gravity, or replace
battery.
See Inspecting the
Battery Electrolyte
Level (Serviceable
Batteries Only) on
page 58.
Alternator power generation
failure.
Consult authorized Yanmar
Marine dealer or distributor.
—
GM_OM.book 67 ページ ２０１３年６月１０日 月曜日 午後２時２６分
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