Toro 74282 Operator's Manual page 33

Figure 36
1. Center electrode insulator
2. Side electrode
Important: Always replace the spark plugs
when it has a black coating, worn electrodes,
an oily film, or cracks.
2. Check the gap between the center and side electrodes
(Figure 36). Bend the side electrode (Figure 36) if
the gap is not correct.
Removing the Spark Plugs
1. Disengage the PTO and set the parking brake.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
3. Disconnect the wires from the spark plugs
(Figure 37).
Figure 37
1. Spark-plug wire/spark plug
4. Clean around the spark plugs to prevent dirt from
falling into the engine and potentially causing
damage.
5. Remove the spark plugs and the metal washers.
3. Air gap (not to scale)
Installing the Spark Plugs
1. Install the spark plugs and the metal washer. Ensure
that the air gap is set correctly.
2. Tighten the spark plugs to 18 to 22 ft-lb (24.4 to
29.8 N⋅m).
3. Connect the wires to the spark plugs (Figure 36).
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