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Adjusting Nut
Rocker Arm
.003-.006
in.
(.076-.152
mm)
t
Feeler
Gauge
Fig. 36
Valve
Stem
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 35 and 36.
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. 36).
•
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.
REPLACING
THE SPARK PLUG
Use a replacement
part number 753-05784 or Champion spark plug,
#RDZ19H. The correct air gap is 0.025 in. (0.635 mm.). Remove the plug
after every 40 hours of operation and check its condition.
1.
Stop the engine and allow it to cool. Remove the six (6)screws on the back
of the engine cover with a Flat-head or T-25 Torx screwdriver (Fig. 33).
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.
I _
I WARNING:
Do not sand blast, scrap e or clean electrodes.
Grit
in the engine could damage the cylinder.
4.
Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in.
(0.635 mm.) using a feeler gauge (Fig. 37).
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:
_J
L
j--\
110-120 in,•lb, (12.3-13.5
N•m}
Do not over tighten.
0.025 in.
(0.635 mm)
Fig.37
SPARK ARRESTOR
MAINTENANCE
1.
Remove the rear engine
cover. See Rocker Arm
Muffler
Clearance.
2.
With a flat blade
Slot
Spark Arrestor
screwdriver
or Torx T-20
Screen
bit and a T-25 bit,
remove the screws
attaching the spark
arrestor diverter to the
muffler (Fig. 38).
3.
Pull the spark arrestor
diverter out of the
muffler. Remove the
spark arrestor diverter.
4.
Remove the spark
arrestor screen from the
spark arrestor diverter.
Fig. 38
5.
Clean the spark arrestor
screen with a wire brush or replace it.
Spark Arrestor
Cover
T-25 Screw
T-30
Screw
6.
Reinstall the spark arrestor screen, spark arrestor diverter and screws.
CLEANING
I 41_iL
I WARNING:
T° av°id serious personal injury, always turn Your
unit off and allow it to cool before you clean or service it.
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 1 oz. (30 ml)
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 trimmer after storage.
4.
Change the oil, referring to Changing the Off. 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.
REPLACEMENT
LINE
Craftsman
XTRA QUIET Spiral Line ........................................................
85621
I
12
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