As part of the complete restoration of a Volkswagen Kübelwagen, its original air-cooled flat-four engine was also fully rebuilt. Careful disassembly and inspection revealed extensive wear along with several previously sustained internal defects. Following precision machining, component restoration and meticulous reassembly, the original engine was upgraded to a 1600 cc specification. The objective was to preserve the character of the historic Volkswagen design while creating a more reliable and enjoyable engine for regular use.