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C1Difficulty 1/5

In a synchromesh manual gearbox, a gear grinds when you try to engage it. Which statement is correct?

Correct answer

It may be caused by wear in its synchroniser; diagnosis is required.

One possible cause is wear in that gear’s synchroniser, but noise alone does not identify the fault with certainty. Synchronisers belong to the gearbox and help match rotational speeds before engagement. Diagnose the problem before deciding what to repair or replace; do not force the shift.

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All options

  • It necessarily proves a clutch fault and rules out the gearbox.

  • It may be caused by wear in its synchroniser; diagnosis is required.

  • It is always normal and never needs checking.

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