Toro 22321 Operator's Manual page 28

3. Pull the wires off of the spark plugs (Figure 34).
1. Spark plug wire
4. Clean around the spark plugs.
5. Remove both spark plugs and metal washers.
Checking the Spark Plugs
1. Look at the center of both spark plugs (Figure 35).
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 35).
3. Bend the side electrode (Figure 35) if the gap is not
correct.
Installing the Spark Plugs
1. Thread the spark plugs into the spark plug holes.
2. Tighten the spark plugs to 20 ft-lb (27 N-m).
Figure 34
2. Spark plug
Figure 35
3. Air gap (not to scale)
3. Push the wires onto the spark plugs (Figure 34).
4. Close the hood.
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