I am working on a 1978 Freightliner with a Cummins engine the air brake compressor has failed and I am replacing it but have ran into a snag. The front inside bolt closest to the block is nearly inaccessible. Is there a special wrench needed to get this bolt out? Or do I need to remove the belts and pulleys and get it apart from the front? Any help is greatly appreciated this vehicle is one of our tenders for our local FD.