Checking The Spark Plugs; Servicing The Spark Plug - Toro 39519 Operator's Manual

Checking the Spark Plugs

Service Interval: Every 160 hours
Remove spark plugs, check condition and reset gaps,
or replace with new plugs. See the engine owner's
manual.

Servicing the Spark Plug

Service Interval: Every 100 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 34
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 air cleaner is dirty.
Set the gap to 0.75 mm (0.03 inch).
Installing the Spark Plug
Tighten the spark plug(s) to 22 N∙m (16 ft-lb).
Figure 34.
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35
Do not clean the spark plug(s).
Figure 35
Figure 36
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