Which of these, causes the failure of the compression ignition engine from achieving starter rotation?
Show the correct answer
Correct answer
A. Faulty starter.
Explanation
A compression-ignition engine, that is a diesel, will not reach cranking speed if the starter motor is faulty - answer A. It is the starter motor that turns the crankshaft when starting; if it is damaged, the engine will not start turning at all or will turn too slowly for the fuel to ignite by itself.
A charged battery (B) is a condition for successful starting, not an obstacle to it. A loose alternator belt (C) means that the battery charges less well while driving, but it has no effect on starting itself as long as the battery is charged. A diesel needs a high cranking speed, because the fuel is ignited by compressed, hot air, not by a spark plug.
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