Toro 22308 Operator's Manual page 29

4. Clean around the spark plug.
5. Remove the spark plug and metal washer.
Note: There is a hole in the front panel through
which you can gain access to the spark plug with a
socket (Figure 56).
1. Spark plug
Checking the Spark Plug
1. Look at the center of the spark plug (Figure 57).
If you see light brown or gray on the insulator, the
engine is operating properly. A black coating on the
insulator usually means the air cleaner is dirty.
Important: Never clean the spark plugs.
Always replace the spark plugs when they have
a black coating, worn electrodes, an oily film,
or cracks.
1. Center electrode insulator
2. Side electrode
2. Check the gap between the center and side electrodes
(Figure 57).
3. Bend the side electrode (Figure 57) if the gap is not
correct.
Installing the Spark Plug
1. Thread the spark plug into the spark plug hole.
Figure 56
Figure 57
3. Air gap (not to scale)
2. Tighten the spark plug until it compresses the metal
washer and then seat it as follows:
• If you are installing a used spark plug, tighten it
another 1/8 to 1/4 turn.
• If you are installing a new spark plug, tighten it
another 1/2 turn.
3. Push the wire onto the spark plug (Figure 55).
4. Close the hood.
29