Servicing The Spark Plugs - Toro ProCore 648s Operator's Manual

3. Slowly add additional oil to bring the level to
the F (full) mark on the dipstick; refer to
Oil Specification (page 72)
Engine-Oil Level (page
Important:
Do not overfill the crankcase
with oil.
4. Install the oil-fill cap and dipstick.

Servicing the Spark Plugs

Service Interval: Every 200 hours—Check the spark
plugs.
Removing the Spark Plugs
1. Prepare the machine for maintenance refer to
Preparing the Machine for Maintenance (page
65).
2. Pull the wires off the spark plugs
Figure 163
1. Spark-plug wire
3. Clean around the spark plugs.
4. Use a spark-plug socket to remove both spark
plugs and metal gaskets.
Checking the Spark Plugs
Spark-plug type: Champion RC12YC or equivalent
Air Gap: 0.75 mm (0.03 inch)
1. Look at the center of both spark plugs
164). 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 plugs.
Always replace the spark plugs when they
have a black coating, worn electrodes, an
oily film, or cracks.
Engine
and Checking the
72).
(Figure 163).
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2. Spark plug
(Figure
1. Side electrode
2. Center electrode
2. Check the gap between the center and side
electrodes.
3. Bend the side electrode if the gap is not correct.
Installing the Spark Plugs
Ensure that the air gap between the center and side
electrodes is correct before installing each spark plug.
Use a spark-plug wrench for removing and installing
the spark plugs and a gapping tool/feeler gauge to
check and adjust the air gap. Install new spark plugs
if necessary.
1. Thread the spark plugs into the spark-plug holes
of the engine.
2. Use a spark-plug socket and torque wrench to
torque the spark plugs to 27 N∙m (20 ft-lb).
3. Assemble the spark-plug wires onto the spark
plugs (Figure
1. Spark-plug wire
74
Figure 164
3. Insulator
4. 0.75 mm (0.03 inch) air
gap (graphic not to scale)
165).
Figure 165
2. Spark plug
g326888
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