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Instructions for Replacing the Water Pump

Model: Lexus IS MK 1 - Years: 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Part: Pump

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The water pump is driven by the timing belt, therefore it is suggested to carry out this repair only if you have good mechanical knowledge, as a mistake could severely damage the engine. Once the radiator is removed, you can easily access the timing belt: align the timing marks and proceed with the removal of the toothed belt and the auxiliary belt.

Then move on to removing the water pump located right next to the tensioner; apply thread locker on the fixing bolts of the pulley and tighten them using the nut and counter-nut technique. Clean the pump seat thoroughly and proceed with the installation of the new pump, applying the corresponding gasket and possibly gasket sealant.

Complete the assembly by installing the tensioner and then the toothed belt and the auxiliary belt (due to the complexity of the operations, it is recommended to replace the belts as well).


Updated on 10 February 2026 by ScegliAuto


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