TM 5-3740-214-14
Table 5-3. Direct and General Support Maintenance Troubleshooting (Continued}
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE DOES NOT START BUT TURNS OVER (Continued)
b. Remove the spark plug wire from the spark plug.
c. Turn the ignition switch ON.
WARNING
DO NOT hold the spark plug wire in your bare hands while testing for spark. You can be severely
shocked.
Figure 5-23. Spark Test
d. Hold the spark plug wire about 3/16 inch (4.76 mm) from a grounded engine part.
e. Crank the engine over. As the breaker points open and close, a spark should jump between spark plug
wire and the engine.
(1)
If there is a bright blue spark, go to Step 3.
(2)
If there is no spark, or the spark is weak and yellow, go to Step 4.
Step 3. Check the spark plug.
CAUTION
BE CAREFUL when removing the spark plug from the engine. The insulator will break easily.
5-21
