1906115 Inner Valve Spring Fits Caterpillar Industrial Construction ModelOne New Aftermarket Replacement Inner Valve Spring Fits Caterpillar (Fits CAT) C Series Industrial Engines This aftermarket replacement inner valve spring Fits Caterpillar C7 and C9 series diesel engines, including industrial construction and generator set applications. The inner valve spring works in tandem with the outer valve spring to maintain precise valve timing and sealing in the cylinder head, ensuring consistent engine performance and