Onan NHM Series User Manual

TROUBLESHOOTING ENGINE PRIMARY SYSTEMS
lA WARNING I Many troubleshooting procedures present hazards which can result in severe personal
injury or death. Only qualified service personnel with knowledge of fuel, electricity, and machinery
hazards
should perform service procedures. Review safety precautions on inside cover page.
Trouble Possible Cause
High Oil 1. Oil viscosity is too light .
Consumption
(Note: New
engines
2. Crankcase breather valve is
sometimes dirty or faulty.
consume oil
during break-in) 3. Oil leaks.
Low Oil
Pressure
4. Excessive engine wear.
5. Light loading.
1. Oil viscosity is too light.
2. Oil dilution due to:
a. faulty choke
b. fouled spark plug
c. rich fuel mixture
3. Low oil level.
4. Low oil pressure switch
defective.
5. Faulty oil bypass valve.
6. Excessive engine wear or
faulty oil pump.
1 - Prior to Spec F only
2 - Gasoline models only
6-5
Corrective Action
1. Drain and refill with oil suitable for
the ambient temperature.
2. Clean crankcase breather
and replace if defective.
3. Locate source of leak and
repair as required.
4. See Engine Block Assembly section.
5. Don't run set at no-load
for long periods of time.
1. Drain and refill with oil suitable for
the ambient temperature.
2.a. Adjust choke.
b. Replace spark
plu~s
c. Adjust fuel mixture · 2
3. Add oil as required.
4. Replace oil pressure switch
(see Engine Block Assembly section).
5.lnspect oil bypass valve and
clean or replace as required
(see Engine Block Assembly section).
6. See Engine Block Assembly section.

Onan NHM Series Specifications

General

Brand	Onan
Model	NHM Series
Category	Inverter
Language	English