General
Information
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This manual dealswith specific mechanical and elec-
trical information needed by engine mechanics for
troubleshooting, servicing, repairing, or overhauling
the engine.
Use the table of contents for a quick reference to the
separate engine system sections.
Use the separate Parts Catalogs for parts identifica-
tion and for establishing their proper location on
assemblies.
The troubleshooting guide is provided as a quick
reference for locating and correcting engine trouble.
The illustrations and procedures presented in each
section apply to the engines listed on the cover. The
flywheel-blower end of the engine is the front end
so
right and left sides are determined by viewing the
engine from the front.
The disassembly section contains major overhaul
procedures for step by step removal, disassembly,
inspection, repair and assembly of the engine
components.
If a major repair or an overhaul is necessary, a compe-
tent mechanic should 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.
The wiring diagram on the last page of the manual
shows
how the electrical components are inter-
connected.
A
parts catalog (available at the dealer level) contains
detailed exploded views of each assembly and the
individual piece part numbers and their proper names
for ordering replacement parts.
Use only Genuine Onan replacement parts to ensure
quality and the best possible repair and overhaul
results. When ordering parts, always use the
com-
plete Model and Spec number
as
well as the Serial
number shown on the nameplate.
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 numberwhen making referencetoyourengine.
How to interpret
MOD€L
and
SPEC
NO.
"if'
$ill
f
1
2
34
1.
Factory code for general identification purposes.
2.
Specific Type:
#
S-MANUAL
starting
MS--ELECTRIC
starting
if any.
factory production modifications.
3.
Factory code for designated optional equipment,
4.
Specification (spec letter) which advances with
1
AWARNING
j
INCORRECT SERVICE
OR
REPLACMENT OF PARTS CAN RESULT IN
SEVERE PERSONAL INJURY AND/OR EQUIPMENT DAMAGE. SERWCE
PERSONNEL MUST BE QUALIFIED
TO
PERFORM ELECTRICAL AND/OR
MECHANICAL SERVICE.
.
2
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