TROUBLESHOOTING AND
TEST PROCEDURES
Checking for Spark
1. Pull off the spark plug cap and remove
the
spark
Plug.
2.
Inspect the spark plug for wear, carbon deposits
and damage. Replace
the
plug if damaged, burnt
or fouled.
3.
Check for the correct spark plug gap and adjust if
necessary to
.020-.024
in
(5.6
mm) by bending
outer electrode.
NOTE:
Do
not pry against inner electrode. This
could crack the insulator.
4.
Attach a spark or ignition tester as shown
in
5.
While maintaining the plug
in
this position, pull
Figures 15 or
16.
the starter-rope and observe for spark.
CAUTION:
DO
NOT TEST FOR SPARK
ERE
GASOLINE HAS BEEN SPILLED
OR
MABLE VAPORS MAY EXIST. A
FIRE
NOTE: The spark may be difficult to see
in
daylight
or other brightly illuminated areas.
6.
If no spark is seen, refer to the troubleshooting
chart on page
9.
Figure 15
Spark
tester
Toro P/N 41-7890
Figure
16
Alternate type spark tester
Checking Fuel Tank Venting
The fuel tank cap vent allows air into the tank as fuel
is consumed. If this vent is blocked
with
dust or dirt,
the engine will eventually stall.
1. Remove the fuel tank cap and inspect the vent. If
the
cap is contaminated with dirt particles, the
vent may need to be replaced.
2.
The cap can be disassembled by prying up the
insert with
a
flat screwdriver. Care should be
used to prevent damage to
the
insert and the
valve (Fig- 17).
Figure 17
3.
Remove the valve, squeeze the valve to close
it,
release
it,
and hold
it
up to
a
light. No light should
be visible through the valve. If light can be seen,
the~valve should be cleaned or replaced.
4.
With the insert removed, hold the cap up to
a
light. Light should be visible through a small hole
at
the center of the cap. if
no
light can be seen,
the'
hole
should be cleaned.
Checking fuel tank
1.
Visually inspect the bottom of
the
fuel tank for dirt
or other contaminants.
2.
If dirt, water, or other contaminants are present,
the
;tank should be flushed with
a
small amount of
fuel, and refilled with fresh fuel.
I
Checking the Stop Switch
The “off” switch used on the
Toro
1500.
300,
and
400
Gas
Trimmers has one set of contact points.
When the switch is in the "off" position, the contacts
are closed, grounding the coil current to the engine.
A continuity tester or ohmmeter is used to check for
continuity Note: If
an
ohmmeter is used .the dial
should, be adjusted to
a
low setting. Attach the two
tester (leads to the two switch leads. Continuity
should be evident with the switch in the "off"
position.
In
the "on" position there should be no
continuity If continuity is intermittent or not evident,
the switch is defective or
a
short has developed in
the
wiring and the switch and harness should be
replaced.
a
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