Engine - Northern Lights M773LW3 Operator's Manual

ENGINE

PROBLEM
Engine Hard to Start
or Will Not Start
Engine Runs Irregularly
or Stalls Frequently
Lack of Engine Power
Updated 2-10-20
Troubleshooting
POSSIBLE CAUSE
Improper starting procedure
No fuel
Low battery output
Excessive resistance
in starting circuit
Crankcase oil too heavy
Improper type of fuel
Water, dirt or air in fuel system
Clogged primary
fuel filter element
Clogged secondary
fuel filter element
Dirty or faulty injection nozzles
Fuel injected but no ignition
Below normal engine temperature • Remove and check thermostat.
Clogged primary
fuel filter element
Clogged secondary
fuel filter element
Water or dirt in the fuel system
Dirty or faulty injection nozzles
Air in fuel system
Improper type of fuel
Low idle, not stable
Intake air restriction
Clogged primary or secondary
fuel filter element
Improper type of fuel
Overheated engine
OM773LW3 11/20
25
RECOMMENDATION(S)
• See starting section of this manual. Take
special note of Bypass Switch operation.
• Check level of fuel in fuel tank.
• Check electrolyte level and condition.
• Clean and tighten all battery connections.
• Use oil of proper viscosity.
• Consult fuel supplier and use proper type
of fuel for operating condition.
• Drain, flush, fill and bleed system.
• Clean or replace filter element.
• Replace filter element.
• Have your dealer check injection nozzles.
• Glow plug malfunction
• Low cylinder compression pressure
• Clean or replace filter element.
• Replace secondary filter element.
• Drain, flush, fill and bleed system.
• Have your dealer check injection nozzles.
• Inspect clamps and hoses on suction side
of fuel pump for air leak.
• Consult fuel supplier and use proper type
of fuel for operating condition.
• Uneven cylinder compression
• Service air cleaner.
• If in sound enclosure - ensure proper
position of snorkle hose
• Clean or replace filter element.
• Consult fuel supplier and use proper type of
fuel for operating conditions.
• See "Engine Overheats" in next category.