In 2012, Caterpillar announced the availability of its initial phases of machine engine rebuild kits for certain machine models powered by 3406, 3306 and 3176 engines. The company’s Precious Metals’ Bronze kits provide the basic components (gaskets, seals, oil and fuel filter, camshaft bearings, exhaust manifold sleeves, etc.) and have no core charge; Silver kits include the Bronze kit plus new, unassembled pistons, piston rings, retainers and cylinder liners and have no core charge; Gold kits include the B