OM673L3 5/21
30
Troubleshooting
ENGINE
PROBLEM
POSSIBLE CAUSE
RECOMMENDATION(S)
Engine Overheats
Low coolant level or cooling
• Fill tank or radiator to proper level.
system defective
• Check hoses for loose connections
and leaks.
• Fan belt slipping.
Keel cooling tubes have been
• Remove paint from tubes.
painted
Cooling system needs flushing
• Flush cooling system.
Defective thermostat
• Remove and check thermostat.
Defective temperature gauge
• Check water temperature with thermometer
and replace gauge if necessary.
Water pump impeller worn/broken • Check impeller and replace if necessary.
Engine Knocks
Insufficient oil
• Contact your authorized NL dealer.
Injection pump out of time
• Contact your authorized NL dealer.
Below normal engine temperature • Check your thermostats.
• Check water temperature to see if
temperature gauge is working properly.
Engine overheating
• See “Engine Overheating” section.
High Fuel Consumption
Improper type of fuel
• Use correct fuel for temperature.
Clogged or dirty air cleaner
• Service air cleaner.
Improper valve clearance
• Contact your authorized NL dealer.
Injection nozzles dirty
• Contact your authorized NL dealer.
Injection pump out of time
• Contact your authorized NL dealer.
Engine overloaded
• Check load usage.
Engine not at proper temperature • Check your thermostats.
• Check water temperature with thermometer
and replace gauge if necessary.
Below Normal
Thermostats not working properly • Check thermostats.
Engine Temperature
Temperature gauge
• Check water temperature with thermometer.
not working properly
If you cannot correct problems with these procedures, see your
Northern Lights
dealer.
Updated 8-7-19
