Servicing The Spark Plug - Toro 29521 Operator's Manual

Servicing the Spark Plug

Service Interval: Every 160 hours
Type for all Engines: NGK BPR4ES or equivalent
Air Gap: 0.75 mm (0.03 inch)
Make sure 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(s) and a gapping tool/feeler gauge to
check and adjust the air gap. Install a new spark
plug(s) if necessary.
Removing the Spark Plug
1. Shut off the engine, engage the parking brake,
remove the key, and wait for all moving parts to
stop before leaving the operating position.
2. Remove the spark plug as shown in
Figure 43
Checking the Spark Plug
Important:
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 spark plug is dirty.
Set the gap to 0.75 mm (0.03 inch).
Figure 43.
Installing the Spark Plug
Tighten the spark plug(s) to 22 N∙m (16 ft-lb).
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Do not clean the spark plug(s).
Figure 44
Figure 45
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