Kohler 4EF Operation - Page 32

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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 spark plug in poor

condition.

results.

6. Check the spark plug gap before installing any

spark plug. See Figure 3-13. 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 0.6-0.7 mm (0.024-0.028 in.).

1. 0.6-0.7 mm (0.024-0.028 in.) gap

2. Spark plug electrodes

Figure 3-13 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 3-14.

Position the side electrode directly over the center

electrode.

Section 3 Scheduled Maintenance

Obtain a new plug for best

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Figure 3-14 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

12-17 Nm (9-12 ft. lbs.). Otherwise, hand-tighten

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

threads or alter electrode gap setting.

11. Check spark plug wire connector in boot for

accumulated dirt, grease, and other debris, and

clean as necessary.

12. Firmly push spark plug boot onto spark plug.

1-511

Do not bump the

TP-5985 10/02