4
TT-1445 7/16
Spark Plugs
1.
Before working on the generator set or connected
equipment, disable the generator set as follows:
a.
Press the OFF button on the generator set controller.
b.
Disconnect the power to the battery charger.
c.
Remove the battery cables, negative (--) lead first.
2. Before removing the spark plug(s), clean or blow
out the area around the base of the plug(s) to keep
dirt and debris out of the engine. Wear suitable eye
protection, as required.
3. Using a spark plug socket, remove and discard the
old spark plug(s).
D
24RCL, 30RCL, and 38RCLB: 13/16 in. socket
D
Other models: 5/8 in. spark plug socket
4. Check and set the gap of the new spark plug(s)
using a wire feeler gauge. See Figure 4. Adjust the
gap by carefully bending the ground electrode.
See Figure 3.
5. For easy removal, apply a light coating of
anti--seize lubricant to the spark plug threads. Wipe
away any excess compound.
6. Install the new spark plug(s) and torque as shown
in Figure 4.
7. Reconnect the spark plug lead(s).
8. Reconnect the battery cable, negative (--) lead last.
TT-1484
1. Spark plug
2. Wire gauge
3. Gap
4. Ground electrode
2
1
4
3
Figure 3
Servicing Spark Plug
Model
8.5RES
6VSG,
8/10/12RESV(L),
12RES(L), 14RES(L),
14RESA(L)
17/18RES(L),
20RES(L),
20RESA(L), 20RESB,
20RESC(L), 20RESD
15RES(A),
15R(E)YG,
30RES(A),
30R(E)YG
24RCL
30RCL,
38RCLB
38RCL,
48RCL,
48RCLA,
60RCL
Spark plug gap,
mm (in.)
0.51 (0.02)
0.76 (0.03)
0.8--0.9
(0.03--0.04)
0.9--1.0
(0.036--0.04)
0.7--0.8
(0.028--0.030)
0.89 (0.035)
Torque,
Nm (ft. lb.)
24.4--29.8
(18--22)
24.4--29.8
(18--22)
25 (18)
18 (13.3)
25 (18.4)
15 (11)
Figure 4
Spark Plug Gap and Torque