Spark Plug; Fuel System Maintenance; Draining The Fuel Tank - Toro 74603 Operator's Manual

Spark Plug

Check the spark plug(s) after every 200 operating
hours. Make sure that 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. Install a new spark plug(s) if necessary.
Type: Champion RC12YC (or equivalent)
Air Gap: 0.030 inch (0.76 mm)
Removing the Spark Plug(s)
1. Disengage the blade control switch and move
the control levers to the neutral locked position
and apply the parking brake.
2. Stop the engine, remove the key, and wait for
all moving parts to stop before leaving the
operating position.
3. Pull the wire(s) off of the spark plug(s)
(Figure 27). 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 27
1. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug(s)
(Figure 28). 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.
2. Spark plug
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 (Figure 28). Bend the side electrode
(Figure 28) if the gap is not correct.
Figure 28
1. Center electrode insulator
2. Side electrode
Installing the Spark Plug(s)
1. Install the spark plug(s). Make sure that the
air gap is set correctly.
2. Tighten the spark plug(s) to 30 ft.-lb. (41 N⋅m).
3. Push the wire(s) onto the spark plug(s)
(Figure 27).
Fuel System
Maintenance

Draining the Fuel Tank

In certain conditions, gasoline is extremely
flammable and highly explosive. A fire or
explosion from gasoline can burn you and
others and can damage property.
• Drain gasoline from the fuel tank when
the engine is cold. Do this outdoors in
an open area. Wipe up any gasoline that
spills.
• Never smoke when draining gasoline,
and stay away from an open flame or
where a spark may ignite the gasoline
fumes.
25
3. Air gap (not to scale)