Air Filter Maintenance; Idle Speed Adjustment - Craftsman 316.791840 Manual Del Operador

3. Wipe up any oil residue on
the unit and clean up any oil
that may have spilled.
Dispose of the oil according
to Federal, State and local
regulations.
4. Refill the crankcase with
3.04 fl.oz. (90 ml) of SAE 30
SF, SG, SH oil.
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. 27).
3. Wash the filter in detergent
and water (Fig. 24). Rinse the
filter thoroughly and allow it to
dry.
4. Apply enough clean SAE 30
motor oil to lightly coat the
filter (Fig. 25).
5. Squeeze the filter to spread and
remove excess oil (Fig. 26).
6. Replace the filter (Fig. 27).
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

The idle speed of the engine is
adjustable. An idle adjustment
screw is between the air filter
cover and the engine starter housing (Fig. 28).
NOTE: Careless adjustments can seriously damage the unit. Aside from
idle speed, only a Sears or other qualified service dealer should
make carburetor adjustments.
MAINTENANCE & REPAIR INSTRUCTIONS
Fig. 21
Fill Line
Fig. 22
Air Filter Cover
Air Filter
Tab
Fig. 23
Fig. 24
Fig. 25
Fig. 26
First, Check Fuel
Old fuel is usually the reason for
improper unit performance. Drain
and refill the tank with fresh fuel
prior to making any adjustments.
Refer to Oil and Fuel Information.
Second, Clean Air Filter
The condition of the air filter is
important to the operation of the
unit. A dirty air filter will restrict air
flow. This is often mistaken for an
out of adjustment carburetor. Check the condition of the air filter before
adjusting the idle speed screw. Refer to Air Filter Maintenance.
Third, Adjust Idle Speed Screw
WARNING:
The cutting attachment may spin during idle speed
adjustments. Wear protective clothing and observe all safety
instructions to prevent serious personal injury.
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. 28). 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.
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.
NOTE: Inspect the valve to
rocker arm clearance
with a feeler gauge after
the first 10 hours of
operation and every 40
hours of operation.
• 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. 29).
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. 29).
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. 30). 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:
8
Tabs
Back
Plate
Air Filter
Locking Tab
Fig. 27
Idle Adjustment
Screw
Fig. 28
View of the Rear Engine Cover
Screws
Fig. 29
Screw
Rocker Arm
Cover
Spark Plug
Hole
Fig. 30
Screws