TP-6905 7/1860 Section 4 Scheduled Maintenance
12. Check the spark plug gap before installing any
spark plug. See Figure 4-6 and Figure 4-7. Attain a
correct gap when the feeler (or wire) passes
between the spark plug electrodes. It should pass
easily but with some resistance or drag; otherwise
adjust as necessary.
Model Spark Plug Gap
24RCL 0.9–1.0 mm (0.036–0.040 in.)
30RCL and 38RCLB 0.7--0.8 mm (0.028--0.030 in.)
Figure 4-6 Spark Plug Gap
1-514
1
2
1. Gap, see Figure 4-6
2. Spark plug electrodes
Figure 4-7 Spark Plug Gap Inspection
13. 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 4-8.
Position the side electrode directly over the center
electrode.
1-511
Figure 4-8 Spark Plug Gap Adjustment
Note: Ensure that the spark plug tubes are seated
before installing the spark plugs. If the tubes were
removed, reinstall them before installing the
spark plugs.
14. Reinstall the spark plug. Do not bump the electrode
against the cylinder head. Rotate the spark plug
clockwise until you feel resistance.
15. Use a torque wrench to tighten each spark plug to
the torque shown in Figure 4-9.
Model Spark Plug Torque
24RCL 18 Nm (13.3 ft. lbs.)
30RCL and 38RCLB 25 Nm (18.4 ft. lbs.)
Figure 4-9 Spark Plug Torque
16. Use a ratchet wrench to tighten an additional 1/4
turn. Do not overtighten, as doing so may strip the
threads or alter the electrode gap setting.
17. Check the spark plug wire connector in the boot for
accumulated dirt, grease, and other debris, and
clean as necessary.
18. Firmly push the spark plug boot onto the spark
plug.
19. Reconnect the generator set engine starting
battery, negative (--) lead last.
20. Reconnect the power for the battery charger.
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