1406188 Inner Valve Spring Fits Caterpillar Industrial Construction ModelOne New Aftermarket Replacement Inner (Intake) Valve Spring Fits Caterpillar (Fits CAT) 3126 C7 Diesel Engines This aftermarket replacement inner valve spring fits the cylinder head of Fits Caterpillar 3126, 3126B, and C7 diesel engines. Used in dual spring valve train assemblies, the inner spring works alongside the outer spring to maintain precise valve control and prevent float under load. Proper spring tension is critical to engine performance and