An adjustable holding tool is provided for servicing a fan clutch assembly removably attached to a shaft of a water pump having a pulley associated therewith. A holding tool is comprised of a first plate holder including a first adjustment leg joined to a first attachment leg having a first longitudinal axis and a first attachment structure. A second plate holder includes a second adjustment leg joined to a second attachment leg having a second longitudinal axis and second attachment structure. The first and second plate holders are slidably connected together to provide a continuous variable spacing between the first and second adjustment legs while maintaining a parallel relationship between the first and second longitudinal axes.