Toro TITAN HD Service Manual page 44

Servicing the Kohler Engine (Cont.)
Checking the Spark Plug
1. Inspect the spark plug.
NOTE: If you see light brown or gray coating 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 (Figure 20).
3. Set the gap to 0.030 in. (0.76 mm).
Installing the Spark Plug
1. Tighten the spark plugs to 20 ± 2 ft-lbs. (25-30 Nm).
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Table of Contents
MAINTENANCE
A B
Figure 20
Digital Edition - TITAN® HD Service Manual
January 2018
B