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Digital Edition - TIMECUTTER® HD Service Manual
April 2017
MAINTENANCE
Maintenance
Servicing the Toro Engine (Cont.)
Checking the Spark Plug
1. Inspect the spark plug.
NOTE: 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.
NOTE: Do not 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.
3. Set the gap to 0.030 in. (0.76 mm) (Figure 9).
Installing the Spark Plug
1. Tighten the spark plugs to 20 ± 2 ft-lbs. (25-30 Nm) (Figure 10).
B
A
Figure 9
B
A
25-30 N-m
18.5-22.1 ft-lb
C
D
Figure 10
B
A
B
A
