Your water pump should be changed every 62,000 miles (100,000 KM), or every 7-years... whichever comes first. If you do not know when it was last changed, we highly suggest changing it. (Includes OEM gasket). 1KZ water pumps will fit 1993 through 2005 Toyota Hiace vans with the 1KZ-TE 3.0 liter diesel engine, with the following chassis: K