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SECTION IV - MINOR OVERHAUL INSTRUCTIONS
4.1
GENERAL INFORMATION
When an engine is not operating properly, a minor
tune-up or overhaul is necessary to bring it up to
good performance.
For a minor tune-up check as follows:
A. Fuel mixture in tank.
Check and clean fuel line and connections
and see that fuel is flowing to carburetor.
B. Check ignition for adequate spark.
If
necessary, refer to Magneto Overhaul,
paragraph 4.2.
Check for correct spark plug. ·Clean plug
and adjust points.
C. Check air cleaner, carburetor and linkage.
Clean air cleaner thoroughly.
Adjust carburetor, refer to paragraph
4.3.
If
performance indicates a dirty and slug-
gish carburetor, refer to Carburetor Over-
haul, paragraph 4.3.
D. Check compression by slowly engaging
starter.
Throttle should be open when
checking compression.
NOTE: On rotary mowers, do not make
compression check unless cutting disc is
removed.
If
compression is low, refer to Section V,
Major Overhaul.
E.
If
excessive carbon is indicated by slug-
gish operation and inspection of spark plug
opening and muffler, refer to Section V,
Major Overhaul.
F. Tighten all external nuts, bolts and screws
.
Clean engine thoroughly.
For minor overhaul of engine refer to the follow-
ing:
Magneto Overhaul, paragraph 4.2
Carburetor Overhaul, paragraph 4.3
Fuel Line and Tank, paragraph 4.4
Adjustments, paragraph 4.5
Starter Overhaul, paragraph 4.6
4.2
MAGNETO OVERHAUL
To overhaul magneto disassemble engine as follows:
A. Remove automatic rewind or gyro starter
by removing the screws that fasten it to
the flywheel. housing. See figure 6.
B. Remove screws from flywheel housing and
high tension wire clip and slip off housing.
On some models the fuel tank is attached
to the housing and must also be removed.
This requires disconnection of the fuel
line and carburetor linkage.,
See figure 6.
Figure 6. Disassembling Engine
C. Remove spark plug and insert flywheel
holder.
special tool (figure 5) in opening.
Turn flywheel until piston is at bottom
dead center.
Screw in stud of special tool
until it locks piston, then tighten lock nut.
D. Use a
5/
8" socket wrench on nut of start-
er pawl assembly and remove assembly.
See figure 7.
E. Screw flywheel knockout nut on crankshaft.
Pull up on flywheel with one hand
and
with
the other hand tap nut sharply with a steel
hammer. Flywheel will snap loose from
crankshaft. See figure 8.
NOTE: Never strike crankshaft directly
with a steel hammer.
The knockout nut
must be used to prevent damage to threads
and bending the crankshaft.
13
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