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SECTION II - ENGINE TROUBLE SHOOTING - - - - - - - - - - - -
2. 1
GENERAL INFORMATION
The most common areas of engine troubles are
the fuel and ignition systems.
Before analyzing
an improperly running engine, make sure tank is
filled with fresh clean fuel of the proper mixture,
ignition
has a good spark and all operating adjust-
ments are correct.
Make a systematic check of
the engine's performance as follows and then use
the TROUBLE CHART to find the trouble.
Use this systematic method for checking out en-
gine
hard starting or lack of power:
A.
Check spark plug
Clean
if
necessary or replace. Set gap
at . 035"
9" Edge-R-Trim (32A9 & 32B9)
10" Trimo (3110 & 8610)
18" Pacer (42C18)
18" Turbo-Cut (34B18 & 34C18)
18" Turbo-Vac (7518 & 75A18)
20" Scepter (8020 & 80A20)
21" Lawn Queen (2C21 & 2D21)
21" Manor (28F21)
21" Turbo-Cut (39B21 & 39C21)
21" Turbo-Cut SP (35C21 & 35D21)
22" Putting Green (9A22)
22" Scepter (8022 & 80A22)
24" Estate (8A24 & 8B24)
24" Rotary SP (40A24)
26" Estate (8A26 & 8B26)
26" Lawn King (12A26)
B.
Check carburetor
Initial settings now recommended:
Idle - 1 turn open
Power -
1-1/4
turns open
See that the air cleaner, the screen in the shut-
off valve, and the screen in the float bowl cover
are clean.
C.
Check engine speed
Proper speed adjustment is essential for best per-
formance and engine protection. Follow this guide
for correct settings: (See figure 3)
RPM Idle
RPM Top Speed
1500 to 2000
3000 to 3300
1500 to 2000
3400 to 3600
1300to 1600
Up
to 3500
1500 to 1800
3000 to 3200
1500 to 2000
3400 to 3500
1500 to 1800
3000 to 3200
1300 to 1600
Up
to 3500
1300 to 1600
Up
to 3500
1500 to 1800
3000 to 3200
1500 to 1800
Up
to 3500
1500 to 1800
Up
to 3400
1500 to 1800
3000 to
3200
1300to 1600
Up
to 3800
1900 to 2100
Up
to
3750
1300to 1600
Up
to 3800
1300to 1600
Up
to 3200
NOTE: Use Vibra-Tak to check RPM's (figure 3).
D.
Check magneto output
Magneto can now be checked quickly without re-
moving it from the engine by using the special
No. S14281 Wico Test Plug shown in figure 4.
The test plug
is
for use in testing magneto out-
put at starting speeds. Note that the engine spark
plug is left in place when this test is being made.
If
no spark is present during the test then follow
these steps to check the entire magneto:
1. Remove flywheel.
Inspect the breaker points
for pitting or corrosion and,
if
necessary, dress
the points with a point file.
Set the breaker
points to • 020", then clean points by drawing
a piece of hard paper such
as
card stock be-
tween them.
2. Drill a
1/
8" vent hole in breaker box on Wico
or Phelan magneto as shown in figure 2. This
8
will ventilate the breaker box and prevent the
formation of moisture from condensation and
oxidation of breaker points.
3. Check the stop switch wire overall for breaks
in the insulation, for shorting at the terminal
on the tank panel or carburetor throttle control
and check all other wires for shorts and loose-
ness.
4. Reinstall the flywheel and again check for
.
spark.
5.
If
the spark is still weak or does not exist use
a tester such as
a
Graham or Merc-0-Tronic
to check the coil and condenser.
If
the magneto tests satisfactorily and the engine
still will not start or is hard to start when cold
or hot, follow the steps listed in the adjoining
check chart.
I
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