Off-Season Storage; Cleaning The Engine - MTD 31A-2M1A729 Operator's Manual

3.
f
Measure the plug gap with a feeler gauge. Correct as
necessary by bending the side electrode, Fig. 7-4. The gap
should be set to .02-.03 inches (0.60-0.80 mm).
Electrode
4====== .02-.03 in.
(0.60-0.80 ram)
Figure 7-4
4.
5.
Check that the spark plug washer is in good condition
and 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 1/2-turn
after the spark plug seats to compress the washer. When
reinstalling a used spark plug, tighten Ys- to 1/4-turn after
the spark plug seats to compress the washer.
CAUTION:
The spark plug must be tightened
securely. A loose spark plug can become very hot
and can damage the engine.
Cleaning the Engine
If the engine has been running, allow it to cool for at least half
an hour before cleaning. Periodically remove dirt build-up from
engine.
CAUTION:
Do not spray the engine with water to
clean it because the water could contaminate the
fuel. Using a garden hose or pressure washing
equipment can also force water into the muffler
opening. Water that passes through the muffler can
enter the cylinder and cause damage.
WARNING! Accumulation of debris around the
muffler could cause a fire. Inspect and clean before
every use.
Off-Season Storage
Engines stored over 30 days need to be drained of fuel to
prevent deterioration and gum from forming in the fuel
system or on essential carburetor parts. If the gasoline in your
engine deteriorates during storage, you may need to have the
carburetor, and other fuel system components, serviced or
replaced.
1. Remove all fuel from the tank by running the engine until
it stops.
2. Change the engine oil.
3. Remove the spark plug and pour approximately 1 oz. (30
ml) of clean engine oil into the cylinder. Pull the recoil
starter several times to distribute the oil, and reinstall the
spark plug.
4. Clean debris from around the engine, and under, around,
and behind the muffler. Apply a light film ofoil on any
areas that are susceptible to rust.
5. Store in a clean, dry and well ventilated area away from any
appliance that operates with a flame or pilot light, such as a
furnace, water heater or clothes dryer. Avoid any area with
a spark producing electric motor, or where power tools are
operated.
6. If possible, avoid storage areas with high humidity.
7. Keep the engine level in storage. Tilting the engine can
cause fuel or oil leakage.
SECTION 7--
ENGINE MAINTENANCE