Troubleshooting Chart - Yanmar 3JH5E Operation Manual

12/05

TROUBLESHOOTING CHART

Symptom
Indicators light on the
instrument panel and alarm
sounds during operation
• Engine oil low pressure
alarm indicator comes on
• Water in sail drive seal
indicator comes on
• Coolant high temperature
alarm comes on
• Faulty Warning Devices
Indicators Do Not Go On:
• The tachometer does not
turn on, even though the
power switch is turned on
• One of the indicators
does not go out
• Battery low charge
indicator does not go out
during operation
Starting Failures:
• Starter turns but engine
does not start
JH Series Operation Manual
Probable Cause
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 level is low.
Engine oil filter clogged.
Rubber sail drive seal broken.
Coolant level is low.
Insufficient seawater causing
temperature to rise.
Contamination inside cooling system.
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.
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.
Sensor switch is faulty.
V-belt is loose or broken.
Battery is defective.
Alternator power generation failure.
No fuel.
Fuel filter is clogged.
Improper fuel.
Problem with fuel injection.
TROUBLESHOOTING
Measure
Check engine oil level. Add
or replace.
Replace engine oil filter.
Replace engine oil.
See your authorized Yanmar
Marine dealer or distributor.
Check coolant level and refill.
Check seawater system.
See your authorized Yanmar
Marine dealer or distributor.
See your authorized Yanmar
Marine dealer or distributor.
See your authorized Yanmar
Marine dealer or distributor.
Replace V-belt or adjust
tension.
Check battery fluid level,
specific gravity or replace
battery.
See your authorized Yanmar
Marine dealer or distributor.
Add fuel. Bleed fuel system.
Replace filter element.
Replace with recommended
fuel.
See your authorized Yanmar
Marine dealer or distributor.
Reference
See Checking the
Engine Oil on
page 40
See Changing the
Engine Oil and
Replacing the
Engine Oil Filter
Element on page 72
-
See Checking and
Adding Coolant on
page 43
-
-
-
-
See Checking and
Adjusting the
Alternator V-Belt
Tension on page 73
See Checking the
Battery Electrolyte
Level (Serviceable
Batteries Only) on
page 78
-
See Filling the Fuel
Tank on page 37
and Bleeding the
Fuel System on
page 38
See Replacing the
Fuel Filter Element
on page 80
See Diesel Fuel
Specifications on
page 34
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