Additional core charge of 3000.00 not included. Caterpillar 3126 Complete Drop-In Engine 64G1D300SB. Serial Number BEJ. 3126, 3-Valve, Industrial. Ordering Instructions: Provide vehicle/equipment year, make, model Engine Model, year, Arrangement number, and Serial number.. Call us toll-free 1-800-282-9319 for ordering assistance and complete warranty information.