Toro 23210 Operator's Manual page 26

1. Spark-plug wire/spark plug
4. Clean around the spark plug to prevent dirt from
falling into the engine and potentially causing
damage.
Note: The heat shield may interfere on the right
side; remove it if necessary and replace it when
finished.
5. Remove the spark plug and the metal washer.
Checking the Spark Plug
1. Look at the center of the spark plug (Figure 36).
If you see light brown or gray on the insulator, the
engine is operating properly. A black coating on the
insulator usually means that the air cleaner is dirty.
2. If needed, clean the spark plug with a wire brush to
remove carbon deposits.
1. Center electrode insulator
2. Side electrode
Figure 35
Figure 36
3. Air gap (not to scale)
Important: Always replace the spark plug when
it has worn electrodes, an oily film on it, or has
cracks in the porcelain.
3. Check the gap between the center and side electrodes
(Figure 36). Bend the side electrode (Figure 36) if
the gap is not correct.
Installing the Spark Plug
1. Install the spark plug and the metal washer. Ensure
1
that the air gap is set correctly.
2. Tighten the spark plug to 16 ft-lb (22 N-m).
3. Connect the wire to the spark plug (Figure 36).
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