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. Ensure that the machine is stopped and that the engine
is off, and let the machine cool.
2. Disconnect the wire from the spark plug (Figure 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.
2. Wire
Checking the Spark Plug
1. Look at the center of the spark plug (Figure 24). 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
1. Side electrode
2. Center electrode
3. Insulator
2. Check the gap between the center and side electrodes
(Figure 24).
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 20 ft-lb (27 N-m).
3. Connect the wire to the spark plug.
18
2 3 4
G023105
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)
5