BY JIM ALLEN
SPECIAL THANKS ACMOC D4 GURUS
This D315 is a joint father-son project by Kenny Walker II and Kenny Walker III. They bought a non-running 1950 narrow track D4, which had suffered a major engine problem in the woods. They dragged the Cat out of the woods, pulled the engine and found that one of the notorious early Cat 2-piece pistons had come apart. The engine had been freshened up some time in the recent past, so there were a number of new parts in it already. After replacing the broken piston and rod, replacing the one intact 2-piece piston still in it, adding four new liners, rings and freshening up everything else, the engine was ready to go. It wasn’t quite so easy with the pony engine, detailed farther on.