TROUBLESHOOTING
JH Series Operation Manual 91
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 request repairs.
• Engine oil low pressure
alarm indicator comes on
Engine oil level is low. Check engine oil level. Add
or replace.
See Checking the
Engine Oil on
page 40
Engine oil filter clogged. Replace engine oil filter.
Replace engine oil.
See Changing the
Engine Oil and
Replacing the
Engine Oil Filter
Element on page 72
• Water in sail drive seal
indicator comes on
Rubber sail drive seal broken. Consult authorized Yanmar
Marine dealer or distributor.
-
• Coolant high temperature
alarm comes on
Coolant level is low. Check coolant level and refill. See Checking and
Adding Coolant on
page 44
Insufficient seawater 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 due to faulty indicators or alarm.
Indicators Do Not Go On:
• 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-ribbed belt is loose or broken. Replace V-ribbed belt or
adjust tension.
See Checking and
Adjusting the
Alternator V-ribbed
belt Tension on
page 73
Battery is defective. Check battery fluid level,
specific gravity or replace
battery.
See Checking the
Battery Electrolyte
Level (Serviceable
Batteries Only) on
page 78
Alternator power generation failure. Consult authorized Yanmar
Marine dealer or distributor.
-
Starting Failures:
• Starter turns but engine
does not start
No fuel. Add fuel. Bleed fuel system. See Filling the Fuel
Tank on page 37
and Bleeding the
Fuel System on
page 38
Fuel filter is clogged. Replace filter element. See Replacing the
Fuel Filter Element
on page 80
Improper fuel. Replace with recommended
fuel.
See Diesel Fuel
Specifications on
page 34
Problem with fuel injection. Consult authorized Yanmar
Marine dealer or distributor.
-
JH5_EN_OPM.book 91 ページ ２０１３年８月８日 木曜日 午前９時２３分
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