1998 Volvo V70XC Before I remove the bolt the is located below the water pump on the right hand side just left of the crank I wanted to find out what it is for. The bolt has a large molded washer in the the head and not sure if it is a drain bolt or holds something in place that will be a pain to reinstall if I remove the bolt. I am doing a water pump, timing belt and etc. and wanted to remove the plastic cover to clean everything up but did not want to remove this bolt until I can identify what it does. See attached picture with the red arrow pointing to the bolt in question.