What is the maximum duration allowed for starter cranking?

• A. 20 seconds
• B. 10 seconds
• C. 30 seconds
• D. 40 seconds

Answer: (A)

Twenty seconds is the maximum duration for starter cranking. This limit protects the starter motor and the electrical system from overheating due to the high current drawn during engagement. If you crank longer than that, the starter windings can overheat, components can wear faster, and the battery and electrical buses may be stressed, increasing the chance of a failed start or equipment damage. If the engine doesn’t start within twenty seconds, stop cranking and follow the prescribed cooldown or reattempt procedure in the start/ground procedures. Shorter durations (like ten seconds) may be insufficient to bring the engine to starting speed under some conditions, while longer durations exceed the starter’s designed duty cycle.