Yanmar 4JH45 Operation Manual page 93

12/05
Symptom
Low lubrication oil pressure
Coolant temperature too high
Other
Symptom
• Water in sail drive seal
indicator comes on
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 does not turn or
turns slowly (engine can be
turned manually)
JH Series Operation Manual
Probable Cause
Clogged engine oil filter
Engine oil temperature too high
Failure of oil pump
Faulty operation of oil pump relief
valve
Low viscosity of engine oil used
Insufficient engine oil quantity
Faulty pressure switch
Insufficient seawater
Faulty thermostat
Loose drive belt of coolant pump
Overloaded operation
Controller defects system error
Probable Cause
Rubber sail drive seal broken.
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-ribbed belt is loose or broken.
Battery is defective.
Alternator power generation failure.
Faulty clutch position.
Faulty safety switch device.
TROUBLESHOOTING
Measure
Replace
Check the seawater level
Overhaul or replace
Tighten the adjusting valve
Replace the safety valve
Replace the engine oil
Add oil
Replace
Check seawater system
Replace
Adjust the belt tension
Decrease the load
Inspect and conduct servicing
Measure
Consult authorized Yanmar
Marine dealer or distributor.
Consult authorized Yanmar
Marine dealer or distributor.
Consult authorized Yanmar
Marine dealer or distributor.
Replace V-ribbed belt or
adjust tension.
Check battery fluid level,
specific gravity or replace
battery.
Consult authorized Yanmar
Marine dealer or distributor.
Shift to NEUTRAL and start.
Consult authorized Yanmar
Marine dealer or distributor.
Reference
-
-
-
See Checking and
Adjusting the
Alternator V-ribbed
belt Tension on
page 65
See Checking the
Battery Electrolyte
Level (Serviceable
Batteries Only) on
page 70
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