mechanical engineering

GENERAL CONSIDERATIONS The first decision in designing an engine installation is selection of the coupling and drive method to connect the engine to the driven equipment.. The coupling and drive selection connections are closely related to the proper selection of engine support and mounting. This ensures a successful trouble-free installation from the standpoint of both the engine and driven equipment, as well as the power transmission components. (Refer to Mounting and Alignment section.) A rigid precision-type mounting system must be provided for both the engine and driven equipment if a solid or nearly solid driveline is utilized. Drive components which utilize universal joints, drive shafts or belts, and chain-type drives permit slightly greater alignment deviations. When selecting the power transmission system, the possible need for a complete torsional analysis must be considered. System incompatibility will result in premature and/or avoidable failures.Refer to Mounting and Alig...

Principles To provide the necessary alignment between the diesel engine and all mechanically dri-ven components, an understanding of the types of misalignment and the methods of measurement is required. Many crankshaft and bearing failures are the result of improper alignment of drive systems at the time of initial engine instal-lation. Misalignment always results in some type of vibration or stress loading. CAUTION : BEFORE MAKING ANY ATTEMPTS TO MEASURE RUN OUT OR ALIGNMENT, IT IS IMPORTANT THAT ALL SURFACES TO BE MEASURED OR MATED BE COMPLETELY CLEAN AND FREE FROM GREASE, PAINT, OXIDA-TION, OR RUST AND DIRT — ALL OF WHICH CAN CAUSE INACCURATE MEA-SUREMENTS. Common mistakes include failure to detect “run out” of rotating assemblies and paral-lel or angular misalignment of the engineand driven machine. The run out of a hub or flywheel can be measured by turning the part in question while measuring from any stationary point to the surface being checked. This can be done with a dial ind...