Yanmar 3JH4E - Troubleshooting Chart

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 33
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 61
• Water in sail drive seal
indicator comes on
Rubber sail drive seal broken. See your authorized
Yanmar marine dealer or
distributor.
-
• Coolant high
temperature alarm
comes on
Coolant / fresh water in coolant
tank is low.
Check coolant level and
refill.
See Checking
and Adding
Coolant on page
36
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 abnormalities are not identified due to faulty indicators or alarm.
Indicators Do Not Go On:
• When key is turned
ON
• When any trouble
occurs (oil pressure
etc.)
No electrical current available.
Circuit broken or lamp burned
out.
See your authorized
Yanmar marine dealer or
distributor.
-
• One of the indicators
does not go out
Sensor switch is faulty. See your authorized
Yanmar marine dealer or
distributor.
-
TROUBLESHOOTING
JH4 Series Operation Manual 79