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Spark PlugService
_
WARNING!
DO NOT check for spark with spark
plug removed.
DO NOT crank engine with spark
plug removed.
Check the spark plug yearly or every 100 operating
hours. To
ensure proper engine
operation,
the spark plug must be properly
gapped
and free of deposits.
1.
Remove the spark plug boot.
2.
Clean the area around the spark plug.
3.
Use a spark plug wrench
to remove the plug.
i_i
WARNING!
If the engine has been running,
the
muffler,
engine
head and spark plug will be very hot.
Be careful not to touch any of these components
until they have cooled.
4.
Visually inspect the spark plug. Discard the spark plug
if there is apparent
wear, or if the insulator
is cracked or
chipped.
Replace the plug if the electrodes
are pitted,
burned
or fouled
with deposits.
5.
Clean the spark plug with a wire brush if it is to be reused.
6.
Measure the plug gap with a feeler gauge. Correct as
necessary by bending
side electrode.
See Fig. 6-4. The gap
should
be set to 0.030 in. (0.76mm).
AirFilter
NOTE: Not all engines
have air filters, such as engines
used for
snow throwers.
Service the air filter if one is present.
Paper filters cannot
be cleaned
and must be replaced
once a year
or every 100 operating
hours; more often if used in extremely
dusty conditions.
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WARNING!
Never use gasoline or low flash point
solvents for cleaning
the air cleaner element.
A fire
or explosion
could result.
NOTE: Never run the engines
that have air filters
without
them.
Rapid engine wear can result.
1.
Press the tab on the air filter cover and lift the cover, or
un-thread
the thumbscrews,
depending
on the model of
engine you have. See Fig. 6-5.
2.
Replace paper element
when dirty or damaged.
Clean
foam element
or replace when damaged.
7.
8.
9.
Electrode
0.06=0.03
in.
_t-====== 0.60=0.80
mm
Figure 6=4
Check that the spark plug washer is in good condition
Thread the spark plug in by hand to prevent cross-
threading.
After the spark plug is seated, tighten with a spark plug
wrench to compress the washer.
NOTE:When installing a new spark plug, tighten 1/2turn
after the spark plug seats to compress the washer. When
reinstalling a used spark plug, tighten 1/8-1/4 t urn after the
spark plug seats to compress the washer.
NOTE:The spark plug must be securely tightened. An
improperly tightened spark plug can become very hot and
may damage the engine.
3.
Figure 6-5
To clean foam element,
separate it from the paper element
and wash in liquid detergent
and water. Allow to dry
thoroughly
before using. Do not oil the foam element.
Adjustments
DO NOT make any engine adjustments.
Factory settings
are
satisfactory
for most conditions.
If adjustments
are needed,
contact
your Authorized
MTD Servicing
Dealer.
Carburetor
If you think you carburetor
needs adjusting,
see your nearest
Authorized
MTD Servicing
Dealer. Engine performance
should
NOT be affected
at altitudes
up to 7,000 feet (2,134 meters). For
operation
at higher elevations,
contact
your Authorized
MTD
Servicing
Dealer
SECTION
6 --
MAINTENANCE
15
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