Servicing The Spark Plug; Carburetor And Ignition System Information; Servicing The Engine On/Off Switch Assembly; Servicing The Safety Interlock System - Troy-Bilt 47260 Owner/Operator Manua

Maintenance/Repairs
Figure 5-5: Spark plug.
SERVICING THE SPARK PLUG
Check the spark plug yearly or
every 100 operating hours.
Replace the spark plug if the elec-
trodes are pitted or burned, or if
the porcelain is cracked. See
Figure 5-5.
• Use Champion J-8C, Autolite
356, or equivalent. In Canada,
replace with a resistor spark plug
(Champion RJ-17LM).
To Check the Spark Plug:
1. Shut off the engine, disconnect
the spark plug wire from the
spark plug, and make sure that all
moving parts have come to a com-
plete stop.
2. Clean the area around the spark
plug to prevent debris from falling
into the spark plug hole.
3. Remove and inspect the spark
plug.
• Check the electrode gap with a
wire feeler gauge and set gap at
.030", if necessary.
• If reusing spark plug, clean it by
carefully scraping the electrodes.
Do not wire brush or sandblast.
4. Install the spark plug and
tighten securely. If using a torque
wrench, tighten to 15 ft./lbs.
PORCELAIN
SERVICING THE SAFETY
INTERLOCK SYSTEM
The safety interlock system pre-
vents the engine from starting un-
less a vacuuming attachment and
the fan cover are installed. The
system also stops the engine if a
vacuuming attachment or the fan
cover is removed while the engine
is running. When a vacuuming at-
tachment or the fan cover is re-
moved, a circuit closes to ground
out the engine ignition system.
Check the function of the safety in-
terlock system by performing the
test described on Page 22. If the
system is not functioning properly,
either the wiring system or the
switch may be at fault.
With the engine shut off and the
spark plug wire disconnected from
the spark plug, inspect the wiring
system by referring to the wiring
diagram in the separate Parts
Catalog. Check for bare, broken,
loose, disconnected, or improperly
routed wires. If no fault can be
found in the wiring system, it is
likely that the switch itself is faulty.
A new switch and wire assembly
can be installed by following the
wiring diagram in the Parts Catalog.
engine ignition. In the ON position,
it opens the circuit allowing the en-
gine to be started by the recoil
starter. If the system is not func-
tioning properly, either the wiring
or the switch may be at fault.
With the engine shut offand the
spark plug wire disconnected from
the spark plug, inspect the wiring
system by referring to the wiring
diagram in the Parts Catalog.
Check for bare, broken, loose, dis-
connected, or improperly routed
wires. If no fault can be found in
the wiring system, it is likely that
the switch itself is faulty. A new
switch and wire assembly can be
installed by following the wiring
diagram in the Parts Catalog.
CAUTION
Do not tamper with engine
governor which is factory set
for proper engine speed.
Overspeeding engine above
factory high speed setting
can be dangerous and will
void engine warranty.
Authorized service shall be
sought if a problem exists.
The Engine On/Off Switch is con-
nected to the engine ignition sys-
tem by two wires that lead from
the switch wiring harness (refer to
wiring diagram in separate Parts
Catalog).
In the OFF position, the switch
closes a circuit to ground out the
SERVICING THE ENGINE ON/OFF
SWITCH ASSEMBLY
SERVICING THE ENGINE SPARK
ARRESTER (IF SO EQUIPPED)
If the muffler on your engine is
equipped with a spark arrester
screen assembly, remove the as-
sembly every 50 hours of opera-
tion for cleaning and inspection.
Replace the assembly if damaged.
CARBURETOR AND IGNITION
SYSTEM INFORMATION
• The carburetor settings have
been factory adjusted and should
be satisfactory for most conditions.
If you feel that an adjustment is
needed, see an Authorized
Tecumseh Service Outlet. NOTE:
The engine speed is rated at 3750
RPM
(+/-
150 RPM). This speed
rating is obtained with the rotor as-
sembly removed from the machine.
Do not exceed this speed rating.
• The engine is equipped with an
electronic ignition system that does
not use points and a condenser. The
only maintenance required is to ser-
vice the spark plug. If you feel that
the ignition system is not function-
ing properly, see an Authorized
Tecumseh Service Outlet.
.030" GAP
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ELECTRODES
37