OCR Text |
Show Spark Plug Test When there is reason to suspect a spark ping of not firing properly It may be tested by removing It from the cylinder without disconnecting the wire terminal and luylng the metal part of the plug on the engine. By turning the motor over slowly the electrical circuit will then bt, completed com-pleted by the commutator, und. If the spark plug is In working condition, a spark will Jump between Its points. If not, the probability Is that the plug needs cleaning or is short-circuited and useless. |