Kohler 38RCLA Manual page 58

6. Use compressed air to remove dirt from around
each spark plug to prevent dirt particles from falling
into the combustion chamber.
7. Remove spark plugs, one at a time, and examine.
Identify a normal spark plug in good operating
condition by observing a light tan or gray deposit on
firing tip. See Figure 4-10 to evaluate engine
condition by color/condition of a problem spark plug.
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.
results.
9. Check the spark plug gap before installing any
spark plug. See Figure 4-7 and Figure 4-8. 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.
Model
38RCL, 38RCLA, 48RCL, and
60RCL
Figure 4-7 Recommended Spark Plug Gap
1. 0.9 mm (0.035 in.) gap
2. Spark plug electrodes
Figure 4-8 Spark Plug Gap Inspection
58 Section 4 Scheduled Maintenance
Obtain a new plug for best
Spark plug gap
0.9 mm (0.035 in.)
1
2
1-514
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 4-9.
Position the side electrode directly over the center
electrode.
Figure 4-9 Spark Plug Gap Adjustment
11. Reinstall the spark plug.
electrode against the cylinder head. Rotate the
spark plug clockwise until you feel resistance.
12. Use a torque wrench to torque each spark plug to
15 Nm (11 ft. lbs.). Otherwise, hand-tighten the
spark plug until you feel resistance.
13. 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.
14. Check the spark plug wire connector in the boot for
accumulated dirt, grease, and other debris, and
clean as necessary.
15. Firmly push the spark plug boot onto the spark
plug.
16. Reconnect the generator set engine starting
battery, negative (--) lead last.
17. Reconnect the power for the battery charger.
1-511
Do not bump the
TP-6810 6/15