Servicing The Spark Plug; Servicing The Electronic Fuel Injection System - Toro 74255 Operator's Manual

Servicing the Spark Plug

Check the spark plug(s) after every 200 operating hours.
Make sure 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
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. Pull the wire(s) off the spark plug(s) (Fig. 44). Now
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.
2
Figure 44
1. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 45). 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. Check the gap between the center and side electrodes
(Fig. 45). Bend the side electrode (Fig. 45) if the gap is
not correct.
(s)
1
m–4811
2. Spark plug
36
2
1
Figure 45
1. Center 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 20 ft-lb (27 N m).
3. Push the wire(s) onto the spark plug(s) (Fig. 44).
Servicing the Electronic Fuel
Injection System
This machine contains an electronic fuel injection system.
It controls the fuel flow under different operating
conditions.
Checking the Malfunction Indicator Light
If the malfunction indicator light (MIL) illuminates,
during operation, the electronic control unit (ECU) has
detected a problem or fault in the electronic fuel injection
(EFI) system.
Once the MIL illuminates, initial trouble shooting checks
should be made. Refer to Troubleshooting on page 55,
under the MIL section.
If these checks do not correct the problem, further
diagnosis and servicing by an Authorized Service Dealer
is necessary.
3
0.030 inch
(0.76 mm)
m–3215
3. Air gap (not to scale)
(s)