Craftsman 316.79498 - Manual (Page 15)

15. Check the spark plug and reinstall. See Replacing the Spark
Plug.
16. Reinstall the spark plug wire.
17. Reinstall the engine cover. Check alignment of the cover
before tightening the screws. Tighten screws.
18. Push rear end of handle into rear screw location.
19. Slide screw through plastic housing and handle. (Do not
tighten screw.)
20. Open vacuum door, prop open with hand.
21. Push front end of handle into front screw location.
22. Slide front handle screw through plastic housing. (Do not
tighten screw.)
23. Tighten screw near switch and near vacuum door hinge.
24. Tighten handle screws while holding nuts with 3/8” nut driver.
REPLACING THE SPARK PLUG
Use a replacement part number 753-05255 or Champion spark plug,
#RDZ19H. The correct spark gap is 0.025 in. (0.655 mm.). Remove
the plug after every 25 hours of operation and check its condition.
1. Stop the engine and allow it
to cool. Remove the five (5)
screws on the back of the
engine cover with a Flat-
head or T-25 Torx
screwdriver (Fig. 35).
2. Grasp the plug wire firmly
and pull the cap from the
spark plug.
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. Replace cracked, fouled or dirty spark plug. Set the spark
gap at 0.025 in. (0.655 mm.) using a feeler gauge (Fig. 39).
5. Install a correctly-gapped spark plug in the cylinder head.
Turn the 5/8 in. socket clockwise until snug.
If using a torque wrench torque to: 110-120 in.•lb. (12.3-13.5 N•m)
Do not over tighten.
15
Feeler Gauge
Adjusting Nut
Rocker Arm
.003–.006 in.
(.076–.152 mm)
Valve Stem
MAINTENANCE AND REPAIR INSTRUCTIONS
Fig. 38
0.025 in.
(0.655 mm.)
Fig. 39
WARNING: Do not sand blast, scrape or clean
electrodes. Grit in the engine could damage the
cylinder.
WARNING: To avoid serious personal injury,
always turn your unit off and allow it to cool before
you clean or service it.
Fig. 40
Muffler
Spark Arrestor Screen
Diverter
T-20 Screw
Slot
T-25 Screw
SPARK ARRESTOR MAINTENANCE
1.
Remove the rear engine cover. See Rocker Arm Clearance.
2. With a flat blade screwdriver or Torx T-20 bit and a T-25
bit, remove the screws attaching the spark arrestor diverter
to the muffler (Fig. 40).
3. Pull the the spark arrestor diverter out of the muffler.
Remove the spark arrestor diverter.
4. Remove the spark arrestor screen from the spark arrestor
diverter.
5. Clean the spark arrestor screen with a wire brush or
replace it.
6. Reinstall the spark arrestor screen, spark arrestor diverter
and screws.
7. Reinstall the rear engine cover.
CLEANING
Use a small brush to clean off the outside of the unit. Do not
use strong detergents. Household cleaners that contain
aromatic oils such as pine and lemon, and solvents such as
kerosene, can damage plastic housing or handle. Wipe off any
moisture with a soft cloth.
STORAGE
• Never store the unit with fuel in the tank where fumes may
reach an open flame or spark.
• Allow the engine to cool before storing.
• Lock up the unit to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
LONG TERM STORAGE
1.
Drain all gasoline from the gas tank into a container. Do not
use gas that has been stored for more than 60 days. Dispose
of the old gasoline in accordance to Federal, State, and Local
regulations.
2. Start the engine and allow it to run until it stalls. This ensures
that all gasoline has been drained from the carburetor.
3. Allow the engine to cool. Remove the spark plug and put 5
drops of high quality motor oil into the cylinder. Pull the starter
rope slowly to distribute the oil. Reinstall the spark plug.
NOTE: Remove the spark plug and drain all of the oil from the
cylinder before attempting to start the blower after storage.
4. Change the oil, referring to Changing the Oil. Dispose of the
old oil in accordance to Federal, State and Local regulations.
5. Thoroughly clean the unit and inspect for any loose or
damaged parts. Repair or replace damaged parts and tighten
loose screws, nuts or bolts. The unit is ready for storage.
TRANSPORTING
• Allow the engine to cool before transporting.
• Secure the unit while transporting.
• Drain the gas tank before transporting.
• Tighten gas cap before transporting.