General
Information
INTRODUCTION
This manual deals with specific mechanical and elec-
trical information needed by engine mechanics for
troubleshooting, servicing, repairing, or overhauling the
engine.
Use the separate PARTS MANUAL for parts identification
and for establishing their proper location on assemblies.
The PARTS MANUAL contains detailed exploded views
of
each assembly and the individual piece part numbers
and their proper names for ordering replacement parts.
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 sidesaredetermined by viewing theengine
from the front. The
No.
1
cylinder is on the left,
No.
2
cylinder is on the right.
If
a major repair or an overhaul is necessary, a competent
mechanic should either do the job or supervise and
check the work of the mechanic assigned to the job to
ensure that all dimensions, clearances and torque
values are within the specified tolerances.
Use the table of contents for a quick reference to the
separate engine system sections.
The troubleshooting guide is provided as a quick
reference for locating and correcting engine trouble.
The wiring diagram shows how the electrical compo-
nents are interconnected.
The disassembly section contains major overhaul
procedures for step by step removal, disassembly,
inspection, repair, and assembly of the engine
components.
See the Operator’s Manual for fuel and engine oil recom-
mendations and the Periodic Maintenance Schedule.
Use only Genuine Onan replacement parts to ensure
quality and the best possible repair and overhaul
results. When ordering parts, always use the complete
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
specification (spec letter) as shown on the unit name-
plate. Always use these numbers and the engine serial
number when making reference to your engine.
How to interpret MODEL and SPEC
NO.
P
2
16
G
-
I
/
10464
A
1.
2.
3.
4.
5.
6.
7.
12345
6
7
I
AWARNING
I
Factory code for general identification of basic
engine series.
Number
of
cylinders.
BHP
rating.
Fuel required
(G
=
horizontal shaft,
V
=
vertical
shaft).
Engine duty cycle.
Factory code for designated optional equipment,
if
any.
Specification (spec letter) which advances with
factory production modifications.
INCORRECT SERVICE
OR
REPLACEMENT OF PARTS CAN RESULT IN
SEVERE PERSONAL INJURY AND/OR EQUIPMENT DAMAGE. SERVICE
PERSONNEL MUST BE QUALIFIED
TO
PERFORM ELECTRICAL AND/OR
MECHANICAL SERVICE.
1-1
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