Servicing The Spark Plugs; Fuel System Maintenance; Replacing The Fuel Filter - Toro Z149 Z Master 74411 Operator's Manual

Servicing the Spark Plugs

Service Interval/Specication
Check the spark plugs after every 100 operating
hours.
Ensure 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 plugs and a gapping tool/feeler
gauge to check and adjust the air gap. Install a new
spark plugs if necessary.
Type: Champion® RCJ8Y or equivalent Air Gap:
0.030 inch (0.75 mm)
Removing the Spark Plugs
1. Disengage the PTO 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. Disconnect the wires from the spark plugs
(Figure 33).
Figure 33
1. Spark-plug wire/spark plug
4. Clean around the spark plugs to prevent dirt
from falling into the engine and potentially
causing damage.
5. Remove the spark plugs and the metal washers.
Checking the Spark Plugs
1. Look at the center of the spark plugs
(Figure 34). 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.
2. If needed, clean the spark plug with a wire
brush to remove carbon deposits.
Figure 34
1. Center electrode insulator
2. Side electrode
Important: Always replace the spark
plugs when it has a black coating, worn
electrodes, an oily film, or cracks.
3. Check the gap between the center and side
electrodes (Figure 34). Bend the side electrode
(Figure 34) if the gap is not correct.
Installing the Spark Plugs
1. Install the spark plugs and the metal washer.
Ensure that the air gap is set correctly.
2. Tighten the spark plugs to 16 ft-lb (22 N⋅m).
3. Connect the wires to the spark plugs
(Figure 34).
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.
31
3. Air gap (not to scale)