PREFACE This Reference Book has been prepared mainly from a series of notes compiled by J. L. Hobbs, who has had a long and varied experience with the care and repair of gas and oil engines. Much valuable information has also been abstracted from the publications of various manufacturers of gas and oil engines, especially from material obtained through the courtesy of the International Harvester Company of America, the De Vergne Machine Company, and the West- ingliouse Machine Company. INTRODUCTION INTERNAL COMBUSTION ENGINES While there are a great many books dealing with the theory and design of gas engines, as well as their operation, there has been a great lack of information relating to the care and repair of gas engines. Those that have devoted themselves to the work of gas engine repair have Iargely obtained their knowledge of the subject by practical experience. The author of this treatise on gas engine repairs has been forced to obtain his knowledge in this way, which, after...