Car Mechanics (UK) - - Instant Expert -


Re­move any un­der­trays and plas­tic covers to re­veal the wa­ter pump lo­ca­tion. Should you have to raise the ve­hi­cle, en­sure that it is on a level sur­face and sup­ported by axle stands.


Many wa­ter pumps are driven by the cam­belt, which will need to be re­moved first, prior to the wa­ter pump be­ing dis­mounted from the en­gine block. Pumps driven by the tim­ing belt have sprock­ets.


Check the old pump’s in­ter­nal con­di­tion – this one is cor­ro­sion-free, in­di­cat­ing a healthy cool­ing sys­tem. Some models (such as cer­tain VW Group cars) are fit­ted with plas­tic im­pel­lors and these can be­come de­tached from the shaft.


This pump is driven by the aux­il­iary belt, not the cam­belt. As the pul­ley has to be trans­ferred to the new pump, it is eas­ier to loosen its re­tain­ing bolts while the belt is pro­vid­ing ten­sion, rather than when the pump is off the car.


Even if your pump is driven by the cam­belt, you will have to re­move the aux­il­iary belt first, by slack­en­ing the ten­sion and un­hook­ing it from the var­i­ous pul­leys, not­ing the or­der in which it is ar­ranged.


Be aware that crimp­ing the belt could weaken it, so check the multi-ribbed sur­face for ex­ces­sive crack­ing and per­ish­ing. As this age­ing belt ex­hibits light per­ish­ing, it should be re­placed, along with any re­lated pul­leys and ten­sion­ers.

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