Craftsman 316.79197 manual AdjustIdleSpeedScrew, Cleandirtfromaroundthe, Adjusting Nuts, Exhaust

AdjustIdleSpeedScrew

WARNING:Thecuttingattachmentmayspinduring

idlespeedadjustmentsWearprotectiveclothingand. observeallsafetyinstructionstopreventserious personalinjury.

If,aftercheckingthefuelandcleaningtheairfilter,theengine

stillwillnotidle,adjusttheidlespeedscrewasfollows:

1.Starttheengineandletit runatahighidleforaminuteto

warmup.Refer to Starting/Stopping Instructions.

2.Release the throttle trigger and let the engine idle. If the engine stops, insert a small phillips screwdriver in between the Air Filter Cover and the Engine Cover (Fig. 30). 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), until the attachment stops turning.

Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve most engine problems. If not and all of the following are true:

•the engine will not idle

the engine hesitates or stalls on acceleration there is a loss of engine power

Have the carburetor adjusted by a Sears or other qualified service dealer.

ROCKER ARM CLEARANCE

This requires disassembly of the engine. If you feel 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 25 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. 31).

View Of The Rear Engine Cover

[	]
[	I
[	]
Remove	Remove
	Screws

Screws

5. Cleandirtfromaroundthe

rocker arm Cover. Remove

the screw	holding	the rocker	Rocker
arm cover	with a large flat		Arm
blade screwdriver		or Torx T-	Cover
25 bit (Fig. 32). Remove the			\
rocker arm cover and gasket.			\

6.Pull the starter rope slowly to Spark bring the piston to the top of Plug its travel, (known as top dead Hole center). Check that:

The piston is at the top of its travel while looking in the spark plug hole (Fig. 33)

Both rocker	arms	move freely,	Fig. 32
and both valves are closed.
Rocker	Arms	INTAKE	Adjusting Nuts

EXHAUST

Feeler Gauge

Spark Flug

Hole

Fig. 33

If these statements are not true, repeat this step.

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. 34). Measure both the intake and exhaust valves.

Adjusting

Rocker Arm

.003-.006 in.

(.076-.152 mm

C

Valve Stem

Fig. 31

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. 31).

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 33 and 34.

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