An idler pulley in an automotive engine or mechanical drive system is referred to by several alternative names depending on its specific mounting location and function. Common technical synonyms include tensioner pulley (though tensioners often feature a spring arm), guide pulley, guide roller, serpentine belt pulley, and support roller. In heavy industrial machinery, it is frequently called a belt guide wheel or support idler. Each of these terms describes a smooth or grooved spinning wheel mounted on a bearing to route belts safely. You can verify these names through automotive parts catalogs and mechanical glossaries.
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