Servicing The Spark Arrester; Fuel System Maintenance; Replacing The Fuel Filter - Toro 74251 Operator's Manual

3. Pull the wire(s) off the spark plug(s) (Figure 41).
Figure 41
1. Spark plug wire
4. Clean around the spark plug(s) to prevent dirt
from falling into the engine and potentially
causing damage.
5. Remove the spark plug(s) and metal washer.
Checking the Spark Plug
1. Look at the center of the spark plug(s)
(Figure 42). 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
plug(s). Always replace the spark plug(s)
when it has: a black coating, worn
electrodes, an oily film, or cracks.
2. Clean the electrodes with a wire brush or by
scraping them to remove carbon deposits and
wetness.
3. Check the gap between the center and side
electrodes (Figure 42). Bend the side electrode
(Figure 42) if the gap is not correct.
2. Spark plug
Figure 42
1. Canter electrode insulator
2. Side electrode
Installing the Spark Plug
1. Install the spark plug(s). Make sure the air gap
is set correctly.
2. Tighten the spark plug(s) to 17 ft-lb (23 N⋅m).
3. Push the wire(s) onto the spark plug(s)
(Figure 41).

Servicing the Spark Arrester

Inspect the spark arrester every 50 hours for
damage, such as holes in the screen, and for
buildup on the screen. If it is damaged, replace
it with a new spark arrester. If it is dirty, remove
it and clean the screen with a wire brush and/or
soak it in solvent.
Fuel System
Maintenance

Replacing the Fuel Filter

Replace the fuel filter after every 200 operating
hours or yearly, whichever occurs first.
Never install a dirty filter if it is removed from the
fuel line.
1. Disengage the PTO, move the motion control
levers to the neutral locked position, and set
the parking brake.
2. Stop the engine, remove the key, and wait for
all moving parts to stop before leaving the
operating position.
3. Allow the machine to cool down.
4. Close the fuel shutoff valve (Figure 43).
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3. Air gap (not to scale)