The complete service manual was carefully reproduced into digital format from the Click to see larger version of the Allis Chalmers P60 repair manual cover – Army edition. The 6-cylinder naturally aspirated AC (Buda) D262 engine was used in a variety of agricultural and industrial equipment. The Allis Chalmers D262 Engine Service Manual PDF includes specifications, step-by-step instructions and accurate photos/illustrations to aid mechanics with engine service and overhaul. Shop and repair manuals AllisChalmers Forum.