Car Mechanics (UK) - - Instant Expert -

Es­sen­tially an up­mar­ket term for a crank­shaft pul­ley that in­cor­po­rates a rubber damper, that is sand­wiched be­tween a pair of metal sec­tions – these should be in­spected for their con­di­tion af­ter re­moval. As TVDS ab­sorb vi­bra­tions from the crank­shaft, they en­hance the life of the aux­il­iary belt that, in re­cent years, has been re­spon­si­ble for driv­ing an in­creas­ing num­ber of com­po­nents, from the al­ter­na­tor to the air-con­di­tion­ing com­press­sor. Apart from in­creas­ing the risk of the aux­il­iary belt fail­ing and wrap­ping it­self around the tim­ing belt, vi­bra­tions that are caused by a fail­ing TVD can cause the tim­ing belt to de­lam­i­nate – for this rea­son, it is in­ad­vis­able to fit solid pul­leys if a TVD was fit­ted orig­i­nally. Worse still, the TVD can break apart and in­tro­duce frag­ments into the tim­ing belt hous­ing.

For fur­ther in­for­ma­tion about in­spect­ing a worn TVD, please make ref­er­ence to

Note that other parts of the aux­il­iary belt sys­tem, in­clud­ing any idlers, ten­sion­ers and even al­ter­na­tor over­run pul­leys, should be in­spected for rough move­ment and/or seizure.

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