Shindaiwa AH254, Руководство владельца/оператора

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18
Maintenance
(continued)
135-Hour Maintenance
■
Combustion chamber should
be decarbonized, and the valve
clearance should be adjusted. It
is highly recommended that this
is done by a Shindaiwa-trained
service technician.
■
Replace the spark plug annually: Use
only the type recommended in the
”Specifications” section or an equivalent
resistor type spark plug of the correct heat
range. Set spark plug electrode gap to
0.6 mm (0.024 in.).
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!
6. Turn engine over several times,
and return to TDC-compression.
Recheck with proper feeler gauge to
make sure clearance adjustment did
not change as a result of tightening
the lock nut. Readjust as necessary.
7. Replace rocker arm cover gasket
to assure proper sealing and install
cover.
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.
2. Loosen adjuster lock nut so that the
2.5 mm hex socket head adjustment
screw can turn freely.
3. Insert 0.10 mm (0.004 in.) feeler
gauge between valve stem tip and
rocker arm.
4. Turn adjustment screw:
• clockwise = tighter
• counterclockwise = 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 hex driver, tighten
the lock nut with a wrench.
CAUTION!
■
Performing a valve adjustment
incorrectly may cause hard
starting and/or can damage the
engine.
■
If you are unfamiliar with this
engine or uncomfortable with
this procedure, consult with an
authorized Shindaiwa servicing
dealer.
Valve Adjustment
Lubricate cutter assembly and gearcase
Gearcase
grease fitting
B
3. Slide the gearcase out of the tube.
Using a grease gun, pump lithium
based grease (about 10 grams
[1/3 oz.]) into the grease fitting
(B) on the gearcase until you see
old grease being purged from the
gearcase. Purged grease will be
visible in the outer tube cavity.
4. Clean up excess grease, then
reassemble the gearcase onto the
outer tube. Make sure the index
bolt fits into the hole on the outer
tube. Securely tighten both bolts.