Service Manual

General Information
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 sides are determined by viewing the engine
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.
Use only Genuine
Tom Plower Plus 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.
3 6 7
1. Factory code for general identification of basic
2. Number of cylinders.
4. Fuel required (G = gasoline).
5. Engine duty cycle.
6. Factory code for designated optional equipment, if
7. Specification (spec letter) which advances with
engine series.
3. BHP rating.
any.
factory production modifications.
See the Operator's Manual for fuel and oil recommendations and the Periodic Maintenance Schedule.
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