Onan NHC User Manual

Introduction
KNOW YOUR ENGINE
Read this manual carefully, observing all WARNINGS
and CAUTIONS. Operating instructions, adjustments
and periodic maintenance procedures are given so
you ... the owner, can keep your unit running like
new and expect many years of dependable service
from it. Remember ... any machine, regardless of
design or type, will perform only in relation to the service
it receives. Regularly scheduled maintenance lowers
operating costs.
ENGINE MODEL REFERENCE
Identify your model by referring to the MODEL and SPEC
(specification) NO. as shown on the unit nameplate.
Always use this number and the engine serial number
when making reference to your engine.
If a major repair or an overhaul is necessary, Onan
recommends that a competent mechanic either do the
job or supervise and check the work of the mechanic
assigned to do the job to ensure that all dimensions,
clearances and torque values are within the specified
tolerances.
An engine service manual and complete parts catalog
are available at additional cost. Contact your nearest
authorized dealer or Onan Parts and Service Center.
REFERENCE MANUALS
Parts Catalog .. 940-0251
Major Service Manual . 940-0751
These instructions contain the SI metric equivalents following
immediately in parentheses after the U.S. customary units of
measure.
SPECIFICATIONS
Engine Design.Opposed two cylinder,
four cycle, and air cooled
Bore.3.56 inch (90.48 mm)
Stroke.3.0 inch (76 mm)
Displacement.60 CID (983 cm 3 )
Horsepower (3600 RPM)
NHC (Pressure Cooled).25 BHP (18.6 kW)
NHCV (Vacu-Flo Cooled).22.5 BHP (16.8 kW)
Oil Capacity.3.5 qt (3.3 litre)
Oil Capacity with filter change.4.0 qt (3.8 litre)
Compression Ratio .7.0 to 1
TUNE-UP SPECIFICATIONS
Spark Plug Gap.0.025 inch (0.635 mm)
Breaker Point Gap.0.016 inch (0.41 mm)
Valve Lash
Intake .0.005 inch (0.127 mm)
Exhaust.0.013 inch (0.330 mm)
Ignition Timing (static setting).20°BTC
2

Onan NHC Specifications

General

Brand	Onan
Model	NHC
Category	Engine
Language	English