TM 5-3740-214-14
Table 5-1. Direct and General Support Preventive Maintenance Checks and Services (Continued)
M = Monthly
A/R = As Required
Q = Quarterly
H = Hourly
INTERVAL
ITEM
ITEM TO BE INSPECTED
NO. M A/R
Q
H
PROCEDURE
2
ELECTRICAL PARTS
100
a. Check spark plug.
CAUTION
BE CAREFUL when removing spark plug. Too much force can break
spark plug insulator.
Figure 5-7. Spark Plug Cleaning
(1)
Remove spark plug.
(a) Loosen spark plug a few turns.
(b) Blow dirt out of spark plug well with high pressure air.
(c) Remove spark plug by hand.
(2)
Check spark plug visually. Replace it if the following conditions exist.
(a) Cracks in insulator.
(b)
Electrodes worn too thin to be regapped.
(c) Oil fouling, soft, wet, oil covering insulator and plug nose.
5-8
