Northern Lights M844W3 Operator's Manual page 30

ENGINE
PROBLEM
High Fuel Consumption
(continued)
Below Normal
Engine Temperature
Engine Malfunctions at
High Output Range
Low Oil Pressure
High Oil Consumption
Engine Emits Black
or Gray Exhaust Smoke
Engine Emits
White Smoke
Troubleshooting
POSSIBLE CAUSE
Engine not at proper temperature
Fuel leakage
Excessive load on engine
Thermostat not working properly
Temperature gauge
not working properly
Fuel supply insufficient
Fuel injection amount between
plungers uneven
Valve clearance adjusted incorrectly • Re-adjust valve clearances
Valve spring broken
Governor spring broken
Low oil level
Improper type of oil
Partially plugged oil filter
Break-in period
Crankcase oil too light
Oil leaks
Clogged or dirty air cleaner
Defective muffler
(back pressure too high)
Improper fuel
Injection nozzles dirty
Engine timing off
Improper fuel
Cold engine
Defective thermostat
Engine timing off
OM844W3 5/21
28
RECOMMENDATION(S)
• Check your thermostats.
• Check water temperature with thermometer
and replace gauge if necessary.
• Improper installation or tightening.
• Check loads.
• Check thermostat.
• Check water temperature with thermometer.
• Air in fuel system or clogged fuel filter
element
• Check fuel injectors
• Replace valve spring
• Replace governor spring
• Fill crankcase to proper level.
• Drain and fill crankcase with correct oil.
• Replace filter. Check bearings, oil pump,
and relief valve for wear.
• Oil consumption decreases after break in.
• Use proper viscosity oil.
• Check for leaks in lines around gaskets
and drain plug.
• Service air cleaner.
• Have dealer check back pressure.
• Use correct fuel for temperature.
• See your dealer.
• See your dealer.
• Use correct fuel for temperature.
• Warm up engine to normal operating
temperature.
• Remove and check thermostat.
• See your dealer.