Specifications

TROUBLESHOOTING
JH Series Operation Manual 87
12/05
Low lubrication oil pressure Clogged engine oil filter Replace
Engine oil temperature too high Check the seawater level
Failure of oil pump Overhaul or replace
Faulty operation of oil pump relief
valve
Tighten the adjusting valve
Replace the safety valve
Low viscosity of engine oil used Replace the engine oil
Insufficient engine oil quantity Add oil
Faulty pressure switch Replace
Coolant temperature too high Insufficient seawater Check seawater system
Faulty thermostat Replace
Loose drive belt of coolant pump Adjust the belt tension
Overloaded operation Decrease the load
Other Controller defects system error Inspect and conduct servicing
Symptom Probable Cause Measure
Symptom Probable Cause Measure Reference
• Water in sail drive seal
indicator comes on
Rubber sail drive seal broken. Consult authorized Yanmar
Marine dealer or distributor.
-
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 65
Battery is defective. Check battery fluid level,
specific gravity or replace
battery.
See Checking the
Battery Electrolyte
Level (Serviceable
Batteries Only) on
page 70
Alternator power generation failure. Consult authorized Yanmar
Marine dealer or distributor.
-
Starting Failures:
• Starter does not turn or
turns slowly (engine can be
turned manually)
Faulty clutch position. Shift to NEUTRAL and start. -
Faulty safety switch device. Consult authorized Yanmar
Marine dealer or distributor.
-
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