OM673L3 5/21
31
Troubleshooting
If you cannot correct problems with these procedures, see your
Northern Lights
dealer.
Updated 8-7-19
ENGINE
PROBLEM
POSSIBLE CAUSE
RECOMMENDATION(S)
Low Oil Pressure
Low oil level
• Fill crankcase to proper level.
Clogged filter and strainer or
• Repair or replace.
worn bearings and oil pump
Improper type of oil
• Drain and fill crankcase with correct oil.
Partially plugged oil filter
• Replace filter.
High Oil Consumption
Break-in period
• Oil consumption decreases after break in.
Crankcase oil too light
• Use proper viscosity oil.
Oil leaks
• Check for leaks in lines around gaskets
and drain plug.
Engine Emits Black
Clogged or dirty air cleaner
• Service air cleaner.
or Gray Exhaust Smoke
Defective muffler
• Contact your authorized NL dealer to
(back pressure too high)
check back pressure.
Improper fuel
• Use correct fuel for temperature.
Injection nozzles dirty
• Contact your authorized NL dealer.
Engine out of time
• Contact your authorized NL dealer.
Engine Emits
Improper fuel
• Use correct fuel for temperature.
White Smoke
Cold engine
• Warm up engine to normal operating
temperature.
Defective thermostat
• Remove and check thermostat.
Clogged intake hose
• Remove and check intake hose.
Engine out of time
• Contact your authorized NL dealer.
