4W2472 Inner Valve Spring Fits Caterpillar Industrial Construction 3406 3406BOne New Aftermarket Replacement Inner Valve Spring Fits Caterpillar (Fits CAT) 3406 Series Engines This aftermarket replacement inner valve spring Fits Caterpillar (Fits CAT) 3406, 3406B, and 3406C diesel engines. It is the inner spring in the dual valve spring assembly used on the cylinder head of these inline 6 cylinder, 14. 6 liter engines, working alongside the outer spring to maintain precise valve timing and sealing. Replaces OEM part number
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4W2472 Inner Valve Spring Fits Caterpillar Industrial Construction 3406 3406B