
TROUBLESHOOTING
72 6LPA Series Operation Manual
Starting Failures:
• Starter turns but engine
does not start
No fuel. Add fuel. Bleed fuel
system.
See Filling the Fuel Tank
on page 28 and See
Bleeding the Fuel
System on page 29.
Air in fuel line. Bleed fuel system. See Bleeding the Fuel
System on page 29.
Fuel filter is clogged. Replace filter element.
See Replacing the Fuel
Filter Element on page 63.
Improper fuel. Replace with
recommended fuel.
See Diesel Fuel
Specifications on page 26.
Problem with fuel
injection.
See your authorized Yanmar
Marine dealer or distributor.
-
Compression leakage
from intake / exhaust
valve.
See your authorized
Yanmar Marine dealer or
distributor.
-
• Starter does not turn or
turns slowly (engine can
be turned manually)
Faulty clutch position. Shift to NEUTRAL and
start.
-
Insufficient battery
charge.
Check fluid level.
Recharge. Replace.
See Checking the Battery
Electrolyte Level on
page 57.
Cable terminal contact
failure.
Remove corrosion from
terminals. Tighten battery
cables.
-
Faulty safety switch
device.
See your authorized Yanmar
Marine dealer or distributor.
-
Faulty starter switch.
See your authorized Yanmar
Marine dealer or distributor.
-
Power lacking due to
accessory drive being
engaged.
See your authorized Yanmar
Marine dealer or distributor.
-
• Engine cannot be turned
manually
Internal parts seized.
See your authorized Yanmar
Marine dealer or distributor.
-
Abnormal Exhaust Color:
•Black smoke
Overload Reduce load. -
Improper propeller
matching.
See your authorized Yanmar
Marine dealer or distributor.
-
Dirty air cleaner. Clean air cleaner. See Cleaning the Air
Cleaner on page 65.
Improper fuel. Replace with
recommended fuel.
See Diesel Fuel
Specifications on page 26.
Faulty spraying of fuel
injector.
See your authorized Yanmar
Marine dealer or distributor.
-
Low boost pressure.
See your authorized Yanmar
Marine dealer or distributor.
-
Incorrect intake / exhaust
valve clearance.
See your authorized Yanmar
Marine dealer or distributor.
-
• White smoke
Improper fuel. Replace with
recommended fuel.
See Diesel Fuel
Specifications on page 26.
Faulty spraying of fuel
injector.
See your authorized Yanmar
Marine dealer or distributor.
-
Fuel injection timing off.
See your authorized Yanmar
Marine dealer or distributor.
-
Engine burning oil
(excessive consumption).
See your authorized Yanmar
Marine dealer or distributor.
-
Symptom Probable Cause Measure Reference
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