The purpose of this recommended practice for installation@ maintenance@ and operation of internal-combustion engines is threefold@ viz.: a. To present information of a general nature pertaining to their installation and to emphasize installation recommendations for specific types of service@ observation of which is often overlooked. b. To present maintenance check-off lists for daily@ weekly@ and monthly maintenance of such engines. c. To present trouble-shooting recommendations with which the causes of most common engine troubles can be determined. This publication does not purport to be a detailed instruction manual; and@ in cases where additional information is required on a particular piece of equipment@ the manufacturer should be consulted. To present (see Appendix A) recommendations for minimizing potential fires andor explosions. The information presented under installation and maintenance has been classified as: a. Applicable generally to all types of internal-combustion engines in all types of service. b. Particularly applicable to engines in drilling or semi-portable plant service. Particularly applicable to engines in oil-well pumping@ oil-pump@ or similar service where the engines may or may not be under daily observation. Both multiple-cylinder and single- or two-cylinder engines are considered in the latter category.