8. Iftheclearanceisnotwithinspecification:

a.Turntheadjustingnutusinga5/16inch(8mm)wrenchor nutdriver(Fig34). .

Toincreaseclearance,turntheadjustingnut

counterclockwise.

Todecreaseclearance,turntheadjustingnutclockwise.

b.Recheckbothclearances,andadjustasnecessary.

9.ReinstalltherockerarmcoverusinganewgasketTorque. thescrewto20-30inolb(2.2-3.4N*m).

10.CheckthesparkplugandreinstallSeeReplacingthe.

SparkPlug.

11.Replacethesparkplugwire.

12.ReinstalltheenginecoverCheckalignmentofthecover.

beforetighteningthescrewsTightenscrews..

REPLACING THE SPARK PLUG

electrodes. Grit in the engine could damage the

I_IARNING: Do not sand blast, scrape or clean cylinder.

Use a replacement part number 753-05255 or Champion spark plug, #RDZ19H. The correct air gap is 0,025 in, (0,635 ram).

Remove the plug after every 25 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. 31).

2.Grasp the plug wire firmly and pull the cap from the spark plug.

3.Clean dirt from around the

spark

plug. Remove

the

0.025

in.

spark

plug from the

cylinder (0.635

mm)

head by turning a 5/8 in. socket counterclockwise.

4. Replace cracked, fouled or

 

dirty spark plug. Set

the air

 

gap at 0.025 in. (0.635 ram)

Fig. 35

using a feeler gauge

(Fig.

 

35).

 

 

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: 1t0-120 in._lb. (12,3=13.5 N_m)

Do not over tighten.

SPARK ARRESTOR MAINTENANCE

1.Remove the rear engine cover. See RockerArm 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. 36).

Muffler

Spark Arrestor Screen

Diverter

/ T- Screw

Slot

Fig. 36

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.

CLEANING

always turn your unit off and allow it to cool before 1

!_l WARNING:you clean or serviceTo avoidit. serious personal injury,

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 trimmer 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.

t3

Page 13
Image 13
Craftsman 316.79197 manual Iftheclearanceisnotwithinspecification, Toincreaseclearance,turntheadjustingnut Counterclockwise

316.79197 specifications

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