A system and apparatus for a slip joint mount is disclosed to accommodate thermal expansion of a generator set on a base. One embodiment includes an electric generator driven by a prime mover and an equipment mount coupled to the prime mover. A base includes a mounting aperture and means for retaining the equipment mount to the mounting aperture. Also disclosed is means for allowing for movement of the equipment mount with respect to the mounting aperture due to thermal expansion of a portion of the prime mover.