3. Remove the engine hood and engine duct to access
the engine components.
4. Pull the wires off of the spark plugs (Figure 39).
Clean around the spark plugs to prevent dirt from
falling into the engine and potentially causing
damage.
5. Remove the spark plugs and metal washer.
Figure 39
1.
Spark plug wire installed
2.
Spark plug
Checking the Spark Plug
1. Look at the center of the spark plug (Figure 40).
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. Always
replace the spark plug when it has a black
coating, worn electrodes, an oily film, or cracks.
2. Check the gap between the center and side electrodes
(Figure 40). Bend the side electrode (Figure 40) if
the gap is not correct.
Figure 40
1.
Center electrode insulator
3.
Air gap (not to scale)
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 16 ft-lb (22 N-m).
3. Push the wire(s) onto the spark plug(s) (Figure 39).
30
Summary of Contents for TimeCutter ZD420T
Page 45: ...Schematics G005894 Electrical Diagram Rev A 45 ...
Page 46: ...Notes 46 ...
