Dry motoring longer than how many seconds counts as a normal start?

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

Answer: (D)

Dry motoring spins the engine with the starter but without fuel, letting you verify the engine turns freely and to check for mechanical issues before introducing fuel. The procedure sets a clear limit: twenty seconds. This boundary protects the starter and the engine from excessive duty cycle and overheating. If the dry motoring exceeds twenty seconds, you’re considered into the normal start phase rather than a dry run. So twenty seconds is the cutoff: at or below that, it’s still treated as a dry run within the start sequence; longer than that, you proceed with a normal start. The other times aren’t the defined threshold for this distinction.