Onan NHE Service Manual

Section 6. Engine Primary Systems
INTRO D UCTl ON
The engine primary systems include the following:
0 Cooling System
0 Exhaust System
0 Ignition System
0 Starter Motor
0 Crankcase Ventilation System
0 Governor
0 Fuel System - Gasoline
0 Fuel System - LP Gas Liquid Withdrawal
The engine primary systems can often be serviced
without removing the generator set from the recrea-
tional vehicle and without major disassembly of the
set. Use the following troubleshooting guide to help
locate problems related to the engine primary sys-
tems. Refer to Troubleshooting Generator Set Con-
trol for problems related to starting the generator set.
Trouble
Engine
Misfires
Engine
Backfires
TROUBLESHOOTING ENGINE PRIMARY SYSTEMS
Possible Cause
1. Faulty ignition due to:
a. worn or fouled spark plugs
b. worn ignition points.
,
c. incorrect ignition timing
d. faulty ignition coil, or
e. faulty plug wires.
2. Lean fuel mixture due to:
a. incorrectly adjusted
fuel mixture screws
*b. incorrect float level
c. dirt in carburetor
d. vacuum leak.
3. *Contaminated fuel
4. *Carburetor icing
*Gasoline sets only
~~
1. Faulty ignition due to:
a. incorrect ignition timing
b. incorrect spark plug gap
2. Lean fuel mixture due to:
a. incorrectly adjusted
fuel mixture screws
*b. incorrect float level
c. dirt in carburetor
3. Mechanical damage to engine
'Gasoline sets only
Corrective Action
1 a. Clean or replace
spark plugs
1 b. Replace breaker points
IC. Set breaker point gap
1 d. Test coil and replace if
necessary
le. Test spark plug wires
and replace if faulty
2a. Adjust carburetor main
and idle adjustment screws
2b. Adjust carburetor
float level
2c. Disassemble carburetor
and clean all internal
passages
2d. Locate leak and correct as required
3. Drain fuel tank and
refill with fresh fuel
4. In cold weather, place air preheater
in winter position
1 a. Adjust breaker point gap
1 b. Reset spark plug gap
2a. Adjust carburetor main
and idle adjustment screws
2b. Adjust carburetor float
level
2c. Disassemble carburetor and
clean all internal passages
3. See Engine Block Assembly
6-1
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.

Onan NHE Specifications

General

Brand	Onan
Model	NHE
Category	Portable Generator
Language	English