139/150-Hour Maintenance
Maintenance after first 139-hours, then ever y 150-hours thereafter.
n Combustion chamber should be decar-
bonized, and the valve clearance should
be adjusted. It is highly recommended
that this is done by a Swisher-trained
service technician.
Valve Adjustment
1. Remove cylinder cover, rocker arm cover,
and spark plug. Rotate the crankshaft
while observing the piston through the
spark plug opening. When the piston
is at the top of the compression stroke
(TDC), the valves can be adjusted.
CAUTION!
n Performing a valve adjustment
incorrectly may cause hard starting
and/or can damage the engine.
n If you are unfamiliar with this engine
or uncomfortable with this proce-
dure, consult with an authorized
Swisher servicing dealer.
Long Term Storage
Whenever the unit will not be used for 30
days or longer, use the following proce-
dures to prepare it for storage:
n Clean external parts thoroughly.
n Drain all the fuel from the fuel tank.
IMPORTANT!
All stored fuels should be stabilized with
a fuel stabilizer such as STA-BIL™, if
Swisher E4 Engine Oil with fuel stabilizer
is not used.
n Replace the spark plug annually: Use
only NGK CMR5H or equivalent resis-
tor type spark plug of the correct heat
range. Set spark plug electrode gap to
0.04-0.08 inch (0.6 -0.7 mm).
. Loosen adjuster locknut so that the .5
mm Allen socket head adjustment screw
can turn freely.
3. Insert 0.10 mm (0.004") feeler gauge
between valve stem tip and rocker arm.
4. Turn adjustment screw (clockwise =
tighter, counter-clockwise = looser) until
feeler gauge is almost snug. Back off
just enough to allow gauge to slip out
with limited resistance.
5. While holding the adjustment screw in
place with the Allen driver, tighten the
locknut with a wrench.
CAUTION!
Gasoline stored in the carburetor for
extended periods can cause hard start-
ing and could also lead to increased
service and maintenance cost.
n Remove the remaining fuel from the fuel
lines and carburetor.
1. Prime the primer bulb until no more fuel
is passing through.
. Start and run the engine until it stops
running.
3. Repeat steps 1 and until the engine will
no longer start.
NOTE:
The NGK CMR5H also meets the requirements
for electro magnetic compliance (EMC).
6. Turn engine over several times, and re-
turnthe to TDC-compression. Recheck
with proper feeler gauge to make sure
clearance adjustment did not change
as a result of tightening the locknut.
Readjust as necessary.
7. Replace rocker arm cover gasket to as-
sure proper sealing and install cover.
IMPORTANT!
If a new gasket is not available and/or the
old gasket is not damaged, the old gasket
may be reused. Never use cracked or
damaged gaskets!
n Remove the spark plug and pour about
1/4 ounce of -cycle mixing oil into the
cylinder through the spark plug hole.
Slowly pull the recoil starter or 3 times
so oil will evenly coat the interior of the
engine. Reinstall the spark plug.
n Before storing the unit, repair or replace
any worn or damaged parts.
n Remove the air cleaner element from the
carburetor and clean it thoroughly with
soap and water. Let dry and reassemble
the element.
n Store the unit in a clean, dust-free area.
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