TM 5-3740-214-14
Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
THE ENGINE IS HARD TO START (Continued)
a.
Remove the spark plug.
(1)
Loosen the spark plug a few turns.
(2)
Blow high pressure air into the spark plug well. This will clean out any dirt or debris.
(3)
Remove the spark plug by hand.
Figure 5-74. Spark Plug Defects
b.
Check the spark plug visually. Replace it and go to Step 2e, if there are:
Cracks in the insulator
Electrodes worn so thin they cannot be regapped
Soft, wet, oily deposits covering the insulator and the plug nose
Build-up of deposits between insulator and the plug shell
Broken insulator and/or bent electrode
NOTE
If the spark plug must be replaced, set the gap at 0.025 inches (0.64 mm).
Oil fouling is a sign of internal engine damage.
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