Onan NH Series User Manual

STARTING SYSTEM
• •
Loose or Corroded Battery Connection
• •
Low or Discharged Battery
• •
Faulty Starter
•
Faulty Start Solenoid
• • • • • • •
Ignition Timing Wrong
• • •
Wrong Spark Plug Gap
• • •
Worn Points or Improper Gap Setting
• •
Bad Ignition Coil or Condenser
• •
Faulty Spark Plug Wires
FUEL SYSTEM
• •
Out of Fuel - Check
• • • • • •
Lean Fuel Mixture - Readjust
• • • •
Rich Fuel Mixture or Choke Stuck
• • • •
Engine Flooded
• • • • • •
Poor Qualicy Fuel
• • • • •
Dirty Carburetor
• • •
e
• • • •
Dirty Air Cleaner
• • •
Dirty Fuel Filter
• • • •
Defective Fuel Pump
INTERNAL ENGINE
• • • • •
Wrong Valve Clearance
• • • • • •
Broken Valve Spring
• • • • •
Valve or Valve Seal Leaking
• • • •
Piston Rings Worn or Broken
• • • • •
Wrong Bearing Clearance
•
COOLING SYSTEM (AIR COOLED)
• •
Poor Air Circulation
• •
Dirty or Oily Cooling Fins
• • • •
Blown Head Gasket
COOLING SYSTEM (WATER COOLED)
•
Insufficient Coolant
Faulty Thermostat
• •
Worn Water Pump or Pump Seal
•
Water Passages Restricted
•
Defective Gaskets
• • • • • •
Blown Head Gasket
LUBRICATION SYSTEM
• •
Defective Oil Gauge
• •
Relief Valve Stuck
• • • • • • •
Faulty Oi 1 Pump
• • • • • •
Dirty Oil or Fi Iter
• • •
e
• • • • • •
Oil Too Light or Diluted
• • • • • • • • •
Oil Level Low
• •
Oi 1 Too Heavy
• • • •
Dirty Crankcase Breather Valve
THROTTLE AND GOVERNOR
• •
Linkage Out of Adjustment
•
Linkage Worn or Disconnected
•
Governor Spring Sensitivity Too Great
•
Linkage Binding
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Onan NH Series Specifications

General

Frequency	60 Hz
Engine Type	4-Cycle
Fuel Type	Gasoline
Starting System	Electric
Voltage	120/240V
Noise Level	72 dB(A) at 7 meters
Fuel Consumption	0.5-1.0 gal/hr (gasoline)