Toro 22984HD Operator's Manual page 34

Servicing the Spark Plug(s)
Service Interval: Every 100 hours/Yearly
(whichever comes first)—For
Toro engines—check the spark
plug(s).
Every 200 hours/Every 2 years (whichever
comes first)—For Toro engines—replace the
spark plug(s).
Ensure that the air gap between the center and side
electrodes is correct before installing the spark plug.
Use a spark plug wrench for removing and installing
the spark plug and a gapping tool or feeler gauge to
check and adjust the air gap. Install a new spark plug
if necessary.
Type: Champion ® RN9YC or NGK
Air gap: 0.75 mm (0.03 inch)
Removing the Spark Plug(s)
1. Park the machine on a level surface, engage
the parking brake (if applicable), and lower the
boom.
2. Shut off the engine and remove the key.
3. Locate and remove the spark plug(s) as shown
in Figure 33.
Figure 44
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34
Checking the Spark Plug(s)
Important:
Do not clean the spark plug(s).
Always replace the spark plug(s) when it has: a
black coating, worn electrodes, an oily film, or
cracks.
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.
Set the gap to 0.75 mm (0.03 inch).
Figure 45
Installing the Spark Plug(s)
Figure 46
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