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5. 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 a spark plug in poor
condition.
results.
6. Check the spark plug gap before installing any
spark plug. See Figure 3-17. 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.
The correct gap is 1.1176 mm (0.044 in.).
1. 1.1176 mm (0.044 in.) gap
2. Spark plug electrodes
Figure 3-17 Spark Plug Gap Inspection
7. 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 3-18.
Position the side electrode directly over the center
electrode.
TP-5981 11/01
Obtain a new plug for best
1
2
1-514
Figure 3-18 Spark Plug Gap Adjustment
8. Reinstall the spark plug.
electrode against the cylinder head. Rotate the
spark plug clockwise until feeling resistance.
9. Use a torque wrench to torque each spark plug to
9-20 Nm (7-15 ft. lbs.). Otherwise, hand-tighten
the spark plug until feeling resistance.
10. 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.
11. Check the spark plug wire connector in the boot for
accumulated dirt, grease, etc., and clean as
necessary.
12. Firmly push the spark plug boot onto the spark
plug.
Section 3 Scheduled Maintenance
1-511
Do not bump the
23
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