Servicing The Spark Plug - Toro VR-2650 Operator's Manual

Servicing the Spark Plug

Service Interval: Every 100 hours—Check the spark
plug.
Ensure that the air gap between the center electrode
and the side electrode is correct before installing the
spark plug. Use a spark-plug wrench for removing
and installing the spark plug and a gapping tool/feeler
gauge to check and adjust the air gap. Install a new
spark plug if necessary.
Models 68034 and 68035: Use a DENSO
U16FSR-UB or an NGK CR5HSB spark plug.
Model 68036: Use a DENSO W14EPR-U or an NGK
BP4ES spark plug.
Removing the Spark Plug
1. Shut off the machine and let it cool.
2. Disconnect the wire from the spark plug
23).
Figure 23
1. Spark plug
3. Clean around the spark plug.
4. Use a spark-plug wrench to remove the spark
plug and the metal washer.
(Figure
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2. Wire
Checking the Spark Plug
1. Look at the center of the spark plug
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.
Important:
Do not clean the spark plug.
Always replace the spark plug when it has a
black coating, worn electrodes, an oily film,
or cracks.
1. Side electrode
2. Center electrode
3. Insulator
2. Check the gap between the center and side
electrodes (Figure
3. If the gap is not within the specified range, do
the following:
A. If the gap is too small, carefully bend
the side electrode away from the center
electrode until the gap between the
electrodes is correct.
B. If the gap is too large, carefully bend the
side electrode toward the center electrode
until the gap between the electrodes is
correct.
Installing the Spark Plug
1. Thread the spark plug into the spark-plug hole.
2. Tighten the spark plug to 27 N∙m (20 ft-lb).
Important:
Ensure that the spark plug is
tightened to the specified torque value. A
loose spark plug may cause damage to the
cylinder, while an overtightened spark plug
may cause damage to the cylinder-head
threads.
3. Connect the wire to the spark plug.
20
(Figure
Figure 24
4. 0.60 to 0.70 mm (0.024 to
0.028 inch) gap (Models
68034 and 68035)
5. 0.70 to 0.80 mm (0.028
to 0.031 inch) gap (Model
68036)
24).
24).
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