Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued)
TEST OR INSPECTION
ENGINE SKIPS AT HIGH SPEED (Continued)
Figure 5-174. Spark Plug Defects
Electrodes worn so thin they cannot be regapped.
Oil fouling, soft, wet, oily covering the insulator and the plug nose. If there is oil fouling, notify
Build-up of deposits between insulator and the plug shell.
Broken insulator or bent electrode.
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.
Check the spark plug gap.
Reset the gap at 0.025 inches (0.64 mm) if necessary and go to Step 1d.
If the gap is ok, go to Step 1d.