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8. Clean spark plugs by wiping them with a rag. File
the center electrode to keep it parallel to the side
electrode.
Note: Do not sandblast, wire brush, scrape, or
otherwise service spark plugs in poor
condition. Obtain a new plug for best results.
9. Check the spark plug gap before installing any
spark plug. See Figure 5-7 and Figure 5-8. Attain a
correct gap when the feeler (or wire) passes
between the spark plug electrode. It should pass
easily but with some resistance or drag; otherwise
adjust as necessary.
Spark Plug Specifications
Spark plug gap
Spark plug torque
Figure 5-7 Recommended Spark Plug Gap
1. 0.9 mm (0.035 in.) gap
2. Spark plug electrodes
Figure 5-8 Spark Plug Gap Inspection
10. Use a gapping tool to gently bend the side
electrode closer to or farther from the center
electrode to set the correct gap. See Figure 5-9.
62
Section 5 Scheduled Maintenance
0.76 mm (0.03 in.)
27 Nm (20 ft. lbs.)
1
2
1-514
Position the side electrode directly over the center
electrode.
Figure 5-9 Spark Plug Gap Adjustment
11. Reinstall the spark plug. Do not bump the electrode
against the cylinder head. Rotate the spark plug
clockwise until you feel resistance.
12. Use a torque wrench to tighten each spark plug to
the torque shown in Figure 5-7. Otherwise,
hand-tighten the spark plug until you feel
resistance. Then use a ratchet wrench to final
tighten an additional 1/4 turn. Do not overtighten,
as doing so may strip the threads or alter the
electrode gap setting.
13. Check the spark plug wire connector in the boot for
accumulated dirt, grease, and other debris, and
clean as necessary.
14. Firmly push the spark plug boot onto the spark
plug.
15. Reconnect the generator set engine starting
battery, negative (- ) lead last.
16. Reconnect the power for the battery charger.
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TP-7102 9/21
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