Northern Lights NL673K, Operator'S Manual

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ONL673 11/13
29
Troubleshooting
ENGINE
PROBLEM POSSIBLE CAUSE RECOMMENDATION(S)
Engine Hard to Start Improper starting procedure • See starting section of this manual. Take
or Will Not Start special note of Bypass Switch operation.
No fuel • Check level of fuel in fuel tank.
Low battery output • Check electrolyte level and condition.
Excessive resistance • Clean and tighten all battery connections.
in starting circuit
Crankcase oil too heavy • Use oil of proper viscosity.
Improper type of fuel • Consult fuel supplier and use proper type
of fuel for operating condition.
Water, dirt or air in fuel system • Drain, flush, fill and bleed system.
Clogged primary or secondary • Clean or replace primary filter element,
fuel filter element replace secondary filter element.
Dirty or faulty injection nozzles • Have your dealer check injection nozzles.
Fuel injected but no ignition • Glow plug malfunction.
• Injection timing not correct.
• Low cylinder compression pressure.
Engine Runs Irregularly Below normal engine temperature • Remove and check thermostat.
or Stalls Frequently
Clogged primary or secondary • Clean or replace primary filter element,
fuel filter element replace secondary filter element.
Water or dirt in the fuel system • Drain, flush, fill and bleed system.
Dirty or faulty injection nozzles • Have your dealer check injection nozzles.
Air in fuel system • Inspect clamps and hoses on suction side
of fuel pump for air leak.
Improper type of fuel • Consult fuel supplier and use proper type
of fuel for operating condition.
Low idle, not stable • Uneven compression cylinders.
Lack of Engine Power Intake air restriction • Service air cleaner.
Clogged primary or secondary • Clean or replace primary filter element,
fuel filter element replace secondary filter element.
Improper type of fuel • Consult fuel supplier and use proper type of
fuel for operating conditions.
Overheated engine • See “Engine Overheats” in next category.
Below normal engine temperature • Remove and check thermostat.
Improper valve clearance • Reset valves. Best done by dealer.
Dirty or faulty injection nozzles • Replace injectors. Best done by dealer.
• See your local dealer.