63
L510010-11
TROUBLESHOOTING - 14
Malfunction Possible Cause Corrective Action
Engine Overheats Loose or worn drive belt(s) Adjust or replace the belts as
necessary.
Collapsed, kinked or leaking Replace the hoses.
hoses.
Transmission/engine oil cooler Remove the water hoses and fl ush
plugged in opposite direction of the normal
fl ow.
Faulty thermostat Replace the thermostat.
Sea-water intake valve Open the valve completely.
partially/fully closed.
Restricted sea-water pickup Remove restriction.
Faulty temperature sending unit Test and replace as necessary.
or gauge
Sea-water pump impeller worn or Replace the impeller.
damaged
The following applies to engines Coolant level low in the fresh-water Check the cooling system for leaks.
equipped with Fresh-Water section of the cooling system Refi ll the system. See Warning
Cooling (FWC) systems. before removing the fi ll cap.
Heat exchanger passages plugged Clean and fl ush the exchanger.
with scales and debris
Improper coolant mixture Install the proper coolant mixture
(50% antifreeze - 50% water).
Insuffi cient engine temperature Faulty thermostat Replace the thermostat.
Faulty temperature sender Replace the temperature sender.
Engine oil pressure low Faulty oil pressure sending unit Test and replace as necessary.
or gauge
Oil level low Add specifi ed oil. Check the engine
for leaks.
Crankcase overfi lled causing oil Remove the required amount of oil.
aeration Determine the cause of overfi lled
condition (improper fi lling, etc.).
Diluted or improper grade/ Change the oil and fi lter.
viscosity of oil Determine the cause of dilution.
(insuffi cient engine temperature,
excessive idling, etc.)
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