Troubleshooting Chart - Yanmar 3JH4E Operation Manual

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:
• When key is turned
ON
• When any trouble
occurs (oil pressure
etc.)
• One of the indicators
does not go out
JH4 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 / fresh water in coolant
tank 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.
Circuit broken or lamp burned
out.
Sensor switch is faulty.
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.
Reference
See Checking
the Engine Oil on
page 33
See Changing
the Engine Oil
and Replacing
the Engine Oil
Filter Element on
page 61
-
See Checking
and Adding
Coolant on page
36
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