Servicing The Spark Plugs - Toro 39678 Operator's Manual

Servicing the Spark Plugs

Service Interval: Every 100 hours/Yearly (whichever
comes first) Replace the spark plugs
if necessary.
Type: Champion RCJ8Y (or equivalent)
Air Gap: 0.762 mm (0.03 inch)
Important:
A cracked, fouled, dirty, or
malfunctioning spark plug must be replaced. Do
not sand-blast, scrape, or clean electrodes by
using a wire brush because grit may eventually
release from the plug and fall into the cylinder.
The result is usually a damaged engine.
Note:
Remove and inspect the spark plugs if the
engine malfunctions.
Removing the Spark Plugs
1. Park the machine on a level surface, disengage
the PTO, and engage the parking brake.
2. Shut off the engine, remove the key, and wait
for all moving parts to stop before leaving the
operating position.
3. Disconnect the spark-plug wires
Figure 28
1. Spark plug
4. Clean around the spark plugs to prevent dirt
from entering the engine and potentially causing
damage.
5. Remove the spark plugs and the washers.
Checking the Spark Plugs
1.
2.
1. Side electrode
2. Center electrode insulator
(Figure 28).
3.
Installing the Spark Plugs
1.
2.
g001469
3.
30
Look at the center of the spark plugs
Note:
If you see light brown or gray on the
insulator, the engine is operating properly. A
black coating on the insulator usually means
that the air cleaner is dirty.
If needed, clean the spark plug with a wire brush
to remove carbon deposits.
Figure 29
Important:
Always replace the spark plugs
when it has worn electrodes, an oily film on
it, or has cracks in the porcelain.
Check the gap between the center and side
electrodes (Figure 29).
Note:
Bend the side electrode
gap is not correct.
Install the spark plugs and the metal washer.
Ensure that the air gap is set correctly.
Tighten the spark plugs to 22 N∙m (16 ft-lb).
Install the spark-plug wire
(Figure 29).
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3. Air gap (not to scale)
(Figure 29) if the
(Figure 29).