Why does a diesel car's starter make a clicking sound but fail to start?

[AlanaDella]

The reasons why a diesel car's starter makes a clicking sound but fails to start are as follows: 1. The starter gear fails to engage with the flywheel ring gear. Reason: The flywheel ring gear is damaged. Remove the flywheel ring gear, reinstall it at a different angle, or replace the ring gear directly. The starter motor is damaged (the solenoid switch is not damaged; the clicking sound is the solenoid switch pushing the starter gear toward the flywheel ring gear). Seek professional repair for the starter motor or replace it directly (when starting a diesel engine, ensure to release the ignition switch immediately after the engine starts. Each start attempt should not exceed 15 seconds. If the first attempt fails, wait at least 2 minutes before trying again). 2. Reasons for the starter making a rattling sound but not starting: loose belt, low battery, generator failure, charging line fault, controller failure, worn starter brushes, ignition system failure, severely worn starter motor gear, or starter motor failure.