Spark Plug; Spark Arrester Screen; Debris Shield Knife Sharpening; Storing A Unit - McCulloch MT3075 User Manual

8-5. SPARK PLUG

1. To remove spark plug B (figure 8-6A) for cleaning or
replacement: make sure engine is off, spark plug is cool
then grasp spark plug boot firmly and remove from
spark plug. Remove spark plug with correct spark plug
tool. Inspect, clean or replace as needed.
2. Spark plug gap = .025" (.635mm) (Figure 8-5A).
3. Torque to 105 to 130 inch pounds (12 to 15 N•m).
Connect spark plug boot.
.025" (.635mm)

8-6. SPARK ARRESTER SCREEN

1. To replace spark arrester screen (A) (Figure 8-6A), use
a needle nose pliers, pinch an edge of the spark
arrester screen. Pull the whole spark arrester screen
out.
2. Use the needle nose pliers to push in a new spark
arrester screen. Then open the pliers a little to press the
inner surface of the spark arrester screen to fasten it.
B

8-7. DEBRIS SHIELD KNIFE SHARPENING

1. Remove cutter knife (A) from debris shield (B) (Figure
8-7A).
2. Place knife in a bench vise. Sharpen knife using a flat
file, being careful to maintain the angle of cutting edge.
File in one direction only.
8 - MAINTENANCE INSTRUCTIONS
8-5A
A
8-6A
A
B

8-8. STORING A UNIT

Failure to follow these steps may cause varnish to
form in the carburetor and difficult starting or permanent
damage following storage.
1. Perform all the general maintenance recommended in
the Maintenance Section of your User Manual.
2. Clean exterior of engine, drive shaft assembly, debris
shield and stringhead.
3. Drain fuel from the fuel tank.
4. After fuel is drained, start engine.
5. Run engine at idle until unit stops. This will purge the
carburetor of fuel.
6. Allow engine to cool (approx. 5 minutes).
7. Using a spark plug wrench, remove the spark plug.
8. Pour 1 teaspoon of clean 2-cycle oil into the
combustion chamber. Pull starter rope slowly several
times to coat internal components. Replace spark plug.
9. Store unit in a cool, dry place away from any source of
ignition such as an oil burner, water heater, etc.
8-9 REMOVING A UNIT FROM STORAGE
1. Remove spark plug.
2. Pull starter rope briskly to clear excess oil from com-
bustion chamber.
3. Clean and gap spark plug or install a new spark plug
with proper gap.
4. Prepare unit for operation.
5. Fill fuel tank with proper fuel / oil mixture. See Fuel and
Lubrication Section.
8-7A
18