Gear­box oil leak

Car Mechanics (UK) - - Tales From The Workshop -

Hav­ing re­cently al­lowed his brother-in-law to re­place the clutch on his wife’s 2005 Citroën Xsara, this cus­tomer dis­cov­ered a few drips of oil on the drive­way. Not want­ing to pester the brother-in­law, who had done the job as a favour, he asked us to es­tab­lish where the leak­ing oil was com­ing from.

We con­firmed that the oil was com­ing from the gear­box and it was likely the re­sult of a slight mis­align­ment of the drive­shaft.

On the Xsara, the drive­shaft is held at the back of the en­gine by a cen­tre bear­ing that is dis­con­nected to re­move the gear­box when re­plac­ing a clutch. Do­ing this al­lows the drive­shaft to be ex­tracted from the gear­box be­fore the gear­box is dropped down. Con­se­quently, when the gear­box is put back, the shaft can be guided in after­wards. If the cen­tre bear­ing is left at­tached, the shaft can dam­age the oil seal as the gear­box is put back into place.

Af­ter re­mov­ing the drive­shaft, a new oil seal stopped the leak and the gear­box oil was topped up.

The oil seal had been dam­aged, al­low­ing gear oil to leak out.

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