Air Filter Maintenance; Idle Speed Adjustment - Craftsman WEEDWACKER 316.791210 Manual Del Operador

NOTE: Use the bottle and
spout saved from initial
use to measure the
correct amount of oil.
The top of the label on
the bottle measures
approximately 3.04 fl.oz.
(90 ml) (Fig. 22). Check
the level, See Checking
the Oil Level. If the level
is low, add a small
amount of oil and
recheck. Do not overfill (Fig. 21).
5. Replace the oil fill plug.
6. Reconnect the spark plug boot.

AIR FILTER MAINTENANCE

WARNING:
To avoid serious personal injury, always turn the
unit off and allow it to cool before cleaning or maintaining it.
Cleaning the Air Filter
Clean and re-oil the air filter every 10 hours of operation. It is an important
item to maintain. Failure to maintain the air filter properly can result in poor
performance or can cause permanent damage to the engine.
1. Open the air filter cover. Push
the tab on the under side of
the cover inward. Then pull
the air filter cover out and up.
(Fig. 23).
2. Remove the air filter
(Fig. 24).
3. Wash the filter in detergent
and water. Rinse the filter
thoroughly and allow it to dry.
4. Apply enough clean SAE 30
motor oil to lightly coat the
filter.
5. Squeeze the filter to spread
and remove excess oil.
6. Replace the filter (Fig. 24).
NOTE: If operating the unit
without the air filter,
WILL VOID the warranty.
7. Reinstall the air filter cover.
Position the slots on the top
of the air filter cover onto the tabs at the top of the back plate
(Fig. 23).
8. Swing the cover down until the tab on the air filter backplate snaps into
place in the slot on the air filter cover (Fig. 23).

IDLE SPEED ADJUSTMENT

WARNING:
The cutting attachment may spin during idle speed
adjustments. Wear protective clothing and observe all safety
instructions to prevent serious personal injury.
The idle speed of the engine is adjustable. An idle adjustment screw is
between the air filter cover and the engine starter housing (Fig. 25).
NOTE: Careless adjustments can seriously damage the unit. Aside from
idle speed, only a Sears or other qualified service dealer should
make carburetor adjustments.
If, after checking the fuel and cleaning the air filter, the engine still will not
idle, adjust the idle speed screw as follows:
1. Start the engine and let it run at a high idle for a minute to warm up.
Refer to Starting/Stopping Instructions.
2. Release the throttle trigger and let the engine idle. If the engine stops,
insert a small phillips in between the Air Filter Cover and the Engine
Cover (Fig. 25). Turn the idle speed screw in, clockwise, 1/8 of a turn at
a time (as needed) until the engine idles smoothly.
NOTE: The cutting attachment
should not rotate when
the engine idles.
3. If the cutting attachment
rotates when the engine
idles, turn the idle speed
screw counterclockwise 1/8
of a turn at a time (as
needed), to reduce idle
speed.
MAINTENANCE & REPAIR INSTRUCTIONS
Fill Line
Fig. 22
Air Filter Cover
Air Filter
Tab
Fig. 23
Tabs
Back
Plate
Air Filter
Locking Tab
Fig. 24
Idle Adjustment
Screw
Fig. 25
Checking the fuel, cleaning the air filter, and adjusting the idle speed should
solve most engine problems. If not and any of the following are true have the
unit serviced by a Sears or other qualified service dealer:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
ROCKER ARM CLEARANCE
WARNING:
To avoid serious personal injury, always turn the
unit off and allow it to cool before cleaning or maintaining it.
This requires disassembly of the engine. If unsure or unqualified to perform this,
take the unit to a Sears or other qualified service dealer.
• The engine must be cold when checking or adjusting the valve clearance.
• This task should be performed inside, in a clean, dust free area.
1. Remove the six (6) screws on the back of the engine cover with a Flat-
head or T-25 Torx screwdriver (Fig. 26).
2. Disconnect the spark plug wire.
3. Clean dirt from around the
spark plug. Remove the spark
plug from the cylinder head by
turning a 5/8 in. socket
counterclockwise.
4. Remove the engine cover
(Fig. 26).
5. Clean dirt from around the
rocker arm cover. Remove
the screw holding the rocker
arm cover with a large flat
blade screwdriver or Torx T-
25 bit (Fig. 27). Remove the
rocker arm cover and gasket.
6. Pull the starter rope slowly to
bring the piston to the top of
its travel, (known as top dead
center). Check that:
• The piston is at the top of its
travel. This should be done by
looking into the spark plug hole.
(Fig. 27)
• Both rocker arms move freely,
and both valves are closed
If these statements are not true,
repeat step 6.
7. Slide the feeler gauge between
the rocker arm and the valve
return spring. Measure the
clearance between the valve
stem and rocker arm (Fig. 28).
Measure both the intake and
exhaust valves.
The recommended clearance for
both intake and exhaust is .003 –
.006 in. (.076 – 0.152 mm). Use a
standard automotive .005 in.
(0.127 mm) feeler gauge. The
feeler gauge should slide between
the rocker arm and valve stem
with a slight amount of resistance,
without binding. See Figures 28
and 29.
8. If the clearance is not within
specification:
a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver
(Fig. 29).
• To increase clearance, turn the adjusting nut counterclockwise.
• To decrease clearance, turn the adjusting nut clockwise.
b. Recheck both clearances, and adjust as necessary.
9. Reinstall the rocker arm cover using a new gasket. Torque the screw to
20–30 in•lb (2.2–3.4 N•m).
10. Check the spark plug and reinstall. See Replacing the Spark Plug.
11. Replace the spark plug wire.
12. Reinstall the engine cover. Check alignment of the cover before tightening
the screws. Tighten screws.
8
View of the Rear Engine Cover
Screws
Fig. 26
Screw
Rocker Arm
Cover
Spark Plug
Hole
Fig. 27
Adjusting Nuts
INTAKE
EXHAUST
Rocker
Arms
Fig. 28
Exhaust Rocker Arm
Adjusting
Nut
0.003–0.006 in.
(0.076–0.152 mm)
Valve Stem
Fig. 29
Screws
Feeler
Gauge