TP-6811 7/1622 Section 2 Scheduled Maintenance
2.6 Ignition System
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or connected equipment, disable the generator
set as follows: (1) Move the generator set master switch to the
OFF position. (2) Disconnect the power to the battery charger.
(3) Remove the battery cables, negative (--) lead first.
Reconnect the negative (--) lead last when reconnecting the
battery. Follow these precautions to prevent starting of the
generator set by an automatic transfer switch, remote
start/stop switch, or engine start command from a remote
computer.
Service the spark plugs at the interval specified in the
service schedule using the following procedure.
1. Press the OFF button on the RDC2 controller.
2. Disconnect the power to the battery charger.
3. Disconnect the generator set engine starting
battery, negative (--) lead first.
4. Remove spark plug wires by grasping the spark
plug boot and turning slightly while pulling. Do not
pull the wire. Pulling on the wire rather than the
boot may damage the wire or terminal.
5. Loosen the spark plug with a ratchet and 5/8-in.
spark p lug socket with a rubber insert to prevent
spark plug damage.
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 2-7 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. Obtain a new plug for best
results.
9. Check the spark plug gap before installing any
spark plug. See Figure 2-5 and Figure 2-6. 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 Spark plug gap
38/48/ 60RCL and 48RCLA 0.9 mm (0.035 in.)
Figure 2-5 Recommended Spark Plug Gap
1-514
1
2
1. 0.9 mm (0.035 in.) gap
2. Spark plug electrodes
Figure 2-6 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 2-8.
Position the side electrode directly over the center
electrode.
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