Spark Plug - Toro 72103 Operator's Manual

Maintenance

Spark Plug

Service Interval/Specification
Install a new spark plug(s) after every 100 operating
hours. Check the spark plug(s) after every 25
operating hours. Make sure 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.
Type: Champion RJ–19LM (or equivalent)
Air Gap: 0.030" (0.762 mm)
Removing the Spark Plug
1. Disengage the power take off (PTO), set the
parking brake, and turn the ignition key to
"OFF" to stop the engine. Remove the key.
2. Open the hood.
3. Pull the wire(s) off the spark plug(s) (Fig. 21).
Now clean around the spark plug(s) to prevent
dirt from falling into the engine and potentially
causing damage.
4. Remove the spark plug(s) and metal washer.
Figure 21
1. Spark plug wire
22
(s)
2
1
1215
2. Spark plug
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 22).
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.
IMPORTANT: Never clean the spark plug(s).
Always replace the spark plug(s) when it has:
a black coating, worn electrodes, an oily film,
or cracks.
2. Check the gap between the center and side
electrodes (Fig. 22). Bend the side electrode
(Fig. 22) if the gap is not correct.
2
1
Figure 22
1. Center electrode insulator
2. Side electrode
Installing the Spark Plug
1. Install the spark plug(s) and metal washer. Make
sure the air gap is set correctly.
2. Tighten the spark plug(s) to 15 ft–lb (20.4 Nm).
3. Push the wire(s) onto the spark plug(s) (Fig. 21).
4. Close the hood.
3
0.030"
(0.762 mm)
3. Air gap (not to scale)
(s)