2110587 Bearing Main Fits CaterpillarOne New Aftermarket Replacement Main Bearing for Caterpillar (Cat) 3176, C10, C11, C12, and C13 Engines This standard size crankshaft main bearing is a direct aftermarket replacement for Caterpillar (Cat) diesel engines in the 3176, C10, C11, C12, and C13 series. The main bearing supports the crankshaft journal and is a critical internal engine component used across a wide range of Cat construction equipment, on highway trucks, and power generation